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/**
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******************************************************************************
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* @file stm32f4xx_usart.c
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* @author MCD Application Team
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* @version V1.0.0RC1
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* @date 25-August-2011
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* @brief This file provides firmware functions to manage the following
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* functionalities of the Universal synchronous asynchronous receiver
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* transmitter (USART):
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* - Initialization and Configuration
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* - Data transfers
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* - Multi-Processor Communication
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* - LIN mode
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* - Half-duplex mode
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* - Smartcard mode
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* - IrDA mode
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* - DMA transfers management
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* - Interrupts and flags management
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*
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* @verbatim
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*
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* ===================================================================
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* How to use this driver
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* ===================================================================
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* 1. Enable peripheral clock using the follwoing functions
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* RCC_APB2PeriphClockCmd(RCC_APB2Periph_USARTx, ENABLE) for USART1 and USART6
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* RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) for USART2, USART3, UART4 or UART5.
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*
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* 2. According to the USART mode, enable the GPIO clocks using
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* RCC_AHB1PeriphClockCmd() function. (The I/O can be TX, RX, CTS,
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* or/and SCLK).
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*
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* 3. Peripheral's alternate function:
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* - Connect the pin to the desired peripherals' Alternate
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* Function (AF) using GPIO_PinAFConfig() function
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* - Configure the desired pin in alternate function by:
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* GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
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* - Select the type, pull-up/pull-down and output speed via
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* GPIO_PuPd, GPIO_OType and GPIO_Speed members
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* - Call GPIO_Init() function
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*
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* 4. Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware
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* flow control and Mode(Receiver/Transmitter) using the USART_Init()
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* function.
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*
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* 5. For synchronous mode, enable the clock and program the polarity,
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* phase and last bit using the USART_ClockInit() function.
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*
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* 5. Enable the NVIC and the corresponding interrupt using the function
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* USART_ITConfig() if you need to use interrupt mode.
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*
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* 6. When using the DMA mode
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* - Configure the DMA using DMA_Init() function
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* - Active the needed channel Request using USART_DMACmd() function
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*
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* 7. Enable the USART using the USART_Cmd() function.
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*
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* 8. Enable the DMA using the DMA_Cmd() function, when using DMA mode.
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*
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* Refer to Multi-Processor, LIN, half-duplex, Smartcard, IrDA sub-sections
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* for more details
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*
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* In order to reach higher communication baudrates, it is possible to
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* enable the oversampling by 8 mode using the function USART_OverSampling8Cmd().
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* This function should be called after enabling the USART clock (RCC_APBxPeriphClockCmd())
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* and before calling the function USART_Init().
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*
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* @endverbatim
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*
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******************************************************************************
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* @attention
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*
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* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f4xx_usart.h"
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#include "stm32f4xx_rcc.h"
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/** @addtogroup STM32F4xx_StdPeriph_Driver
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* @{
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*/
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/** @defgroup USART
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* @brief USART driver modules
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/*!< USART CR1 register clear Mask ((~(uint16_t)0xE9F3)) */
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#define CR1_CLEAR_MASK ((uint16_t)(USART_CR1_M | USART_CR1_PCE | \
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USART_CR1_PS | USART_CR1_TE | \
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USART_CR1_RE))
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/*!< USART CR2 register clock bits clear Mask ((~(uint16_t)0xF0FF)) */
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#define CR2_CLOCK_CLEAR_MASK ((uint16_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \
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USART_CR2_CPHA | USART_CR2_LBCL))
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/*!< USART CR3 register clear Mask ((~(uint16_t)0xFCFF)) */
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#define CR3_CLEAR_MASK ((uint16_t)(USART_CR3_RTSE | USART_CR3_CTSE))
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/*!< USART Interrupts mask */
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#define IT_MASK ((uint16_t)0x001F)
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/** @defgroup USART_Private_Functions
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* @{
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*/
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/** @defgroup USART_Group1 Initialization and Configuration functions
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* @brief Initialization and Configuration functions
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*
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@verbatim
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===============================================================================
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Initialization and Configuration functions
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===============================================================================
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This subsection provides a set of functions allowing to initialize the USART
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in asynchronous and in synchronous modes.
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- For the asynchronous mode only these parameters can be configured:
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- Baud Rate
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- Word Length
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- Stop Bit
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- Parity: If the parity is enabled, then the MSB bit of the data written
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in the data register is transmitted but is changed by the parity bit.
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Depending on the frame length defined by the M bit (8-bits or 9-bits),
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the possible USART frame formats are as listed in the following table:
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+-------------------------------------------------------------+
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| M bit | PCE bit | USART frame |
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|---------------------|---------------------------------------|
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| 0 | 0 | | SB | 8 bit data | STB | |
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|---------|-----------|---------------------------------------|
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| 0 | 1 | | SB | 7 bit data | PB | STB | |
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|---------|-----------|---------------------------------------|
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| 1 | 0 | | SB | 9 bit data | STB | |
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|---------|-----------|---------------------------------------|
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| 1 | 1 | | SB | 8 bit data | PB | STB | |
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+-------------------------------------------------------------+
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- Hardware flow control
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- Receiver/transmitter modes
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The USART_Init() function follows the USART asynchronous configuration procedure
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(details for the procedure are available in reference manual (RM0090)).
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- For the synchronous mode in addition to the asynchronous mode parameters these
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parameters should be also configured:
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- USART Clock Enabled
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- USART polarity
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- USART phase
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- USART LastBit
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These parameters can be configured using the USART_ClockInit() function.
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@endverbatim
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* @{
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*/
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/**
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* @brief Deinitializes the USARTx peripheral registers to their default reset values.
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* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
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* UART peripheral.
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* @retval None
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*/
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void USART_DeInit(USART_TypeDef* USARTx)
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{
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/* Check the parameters */
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assert_param(IS_USART_ALL_PERIPH(USARTx));
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if (USARTx == USART1)
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{
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
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}
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else if (USARTx == USART2)
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{
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
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}
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else if (USARTx == USART3)
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{
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
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}
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else if (USARTx == UART4)
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{
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE);
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}
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else if (USARTx == UART5)
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{
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, DISABLE);
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}
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else
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{
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if (USARTx == USART6)
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{
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART6, ENABLE);
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART6, DISABLE);
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}
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}
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}
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/**
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* @brief Initializes the USARTx peripheral according to the specified
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* parameters in the USART_InitStruct .
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* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
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* UART peripheral.
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* @param USART_InitStruct: pointer to a USART_InitTypeDef structure that contains
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* the configuration information for the specified USART peripheral.
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* @retval None
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*/
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void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
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{
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uint32_t tmpreg = 0x00, apbclock = 0x00;
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uint32_t integerdivider = 0x00;
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uint32_t fractionaldivider = 0x00;
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RCC_ClocksTypeDef RCC_ClocksStatus;
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/* Check the parameters */
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assert_param(IS_USART_ALL_PERIPH(USARTx));
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assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate));
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assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));
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assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));
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assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));
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assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));
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assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));
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/* The hardware flow control is available only for USART1, USART2, USART3 and USART6 */
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if (USART_InitStruct->USART_HardwareFlowControl != USART_HardwareFlowControl_None)
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{
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assert_param(IS_USART_1236_PERIPH(USARTx));
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}
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/*---------------------------- USART CR2 Configuration -----------------------*/
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tmpreg = USARTx->CR2;
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/* Clear STOP[13:12] bits */
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tmpreg &= (uint32_t)~((uint32_t)USART_CR2_STOP);
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/* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit :
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Set STOP[13:12] bits according to USART_StopBits value */
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tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;
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/* Write to USART CR2 */
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USARTx->CR2 = (uint16_t)tmpreg;
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/*---------------------------- USART CR1 Configuration -----------------------*/
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tmpreg = USARTx->CR1;
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/* Clear M, PCE, PS, TE and RE bits */
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tmpreg &= (uint32_t)~((uint32_t)CR1_CLEAR_MASK);
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/* Configure the USART Word Length, Parity and mode:
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Set the M bits according to USART_WordLength value
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Set PCE and PS bits according to USART_Parity value
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Set TE and RE bits according to USART_Mode value */
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tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
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USART_InitStruct->USART_Mode;
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/* Write to USART CR1 */
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USARTx->CR1 = (uint16_t)tmpreg;
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/*---------------------------- USART CR3 Configuration -----------------------*/
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tmpreg = USARTx->CR3;
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/* Clear CTSE and RTSE bits */
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tmpreg &= (uint32_t)~((uint32_t)CR3_CLEAR_MASK);
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/* Configure the USART HFC :
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Set CTSE and RTSE bits according to USART_HardwareFlowControl value */
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tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
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/* Write to USART CR3 */
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USARTx->CR3 = (uint16_t)tmpreg;
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/*---------------------------- USART BRR Configuration -----------------------*/
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/* Configure the USART Baud Rate */
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RCC_GetClocksFreq(&RCC_ClocksStatus);
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if ((USARTx == USART1) || (USARTx == USART6))
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{
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apbclock = RCC_ClocksStatus.PCLK2_Frequency;
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}
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else
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{
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apbclock = RCC_ClocksStatus.PCLK1_Frequency;
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}
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/* Determine the integer part */
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if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
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{
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/* Integer part computing in case Oversampling mode is 8 Samples */
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integerdivider = ((25 * apbclock) / (2 * (USART_InitStruct->USART_BaudRate)));
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}
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else /* if ((USARTx->CR1 & USART_CR1_OVER8) == 0) */
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{
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/* Integer part computing in case Oversampling mode is 16 Samples */
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integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate)));
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}
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tmpreg = (integerdivider / 100) << 4;
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/* Determine the fractional part */
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fractionaldivider = integerdivider - (100 * (tmpreg >> 4));
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/* Implement the fractional part in the register */
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if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
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{
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tmpreg |= ((((fractionaldivider * 8) + 50) / 100)) & ((uint8_t)0x07);
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}
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else /* if ((USARTx->CR1 & USART_CR1_OVER8) == 0) */
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{
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tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);
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}
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/* Write to USART BRR register */
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USARTx->BRR = (uint16_t)tmpreg;
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}
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/**
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* @brief Fills each USART_InitStruct member with its default value.
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* @param USART_InitStruct: pointer to a USART_InitTypeDef structure which will
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* be initialized.
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* @retval None
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*/
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void USART_StructInit(USART_InitTypeDef* USART_InitStruct)
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{
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/* USART_InitStruct members default value */
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USART_InitStruct->USART_BaudRate = 9600;
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USART_InitStruct->USART_WordLength = USART_WordLength_8b;
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USART_InitStruct->USART_StopBits = USART_StopBits_1;
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USART_InitStruct->USART_Parity = USART_Parity_No ;
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USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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}
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/**
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* @brief Initializes the USARTx peripheral Clock according to the
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* specified parameters in the USART_ClockInitStruct .
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* @param USARTx: where x can be 1, 2, 3 or 6 to select the USART peripheral.
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* @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef structure that
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* contains the configuration information for the specified USART peripheral.
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* @note The Smart Card and Synchronous modes are not available for UART4 and UART5.
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* @retval None
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*/
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void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
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{
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uint32_t tmpreg = 0x00;
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/* Check the parameters */
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assert_param(IS_USART_1236_PERIPH(USARTx));
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assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));
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assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));
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assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));
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assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));
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/*---------------------------- USART CR2 Configuration -----------------------*/
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tmpreg = USARTx->CR2;
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/* Clear CLKEN, CPOL, CPHA and LBCL bits */
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tmpreg &= (uint32_t)~((uint32_t)CR2_CLOCK_CLEAR_MASK);
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/* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/
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/* Set CLKEN bit according to USART_Clock value */
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/* Set CPOL bit according to USART_CPOL value */
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/* Set CPHA bit according to USART_CPHA value */
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/* Set LBCL bit according to USART_LastBit value */
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tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
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USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;
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/* Write to USART CR2 */
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USARTx->CR2 = (uint16_t)tmpreg;
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}
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/**
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* @brief Fills each USART_ClockInitStruct member with its default value.
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|
|
* @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef structure
|
|
|
* which will be initialized.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)
|
|
|
{
|
|
|
/* USART_ClockInitStruct members default value */
|
|
|
USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
|
|
|
USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
|
|
|
USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
|
|
|
USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the specified USART peripheral.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the USARTx peripheral.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the selected USART by setting the UE bit in the CR1 register */
|
|
|
USARTx->CR1 |= USART_CR1_UE;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the selected USART by clearing the UE bit in the CR1 register */
|
|
|
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_UE);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Sets the system clock prescaler.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_Prescaler: specifies the prescaler clock.
|
|
|
* @note The function is used for IrDA mode with UART4 and UART5.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
|
|
|
/* Clear the USART prescaler */
|
|
|
USARTx->GTPR &= USART_GTPR_GT;
|
|
|
/* Set the USART prescaler */
|
|
|
USARTx->GTPR |= USART_Prescaler;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the USART's 8x oversampling mode.
|
|
|
* @note This function has to be called before calling USART_Init() function
|
|
|
* in order to have correct baudrate Divider value.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the USART 8x oversampling mode.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the 8x Oversampling mode by setting the OVER8 bit in the CR1 register */
|
|
|
USARTx->CR1 |= USART_CR1_OVER8;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */
|
|
|
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_OVER8);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the USART's one bit sampling method.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the USART one bit sampling method.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the one bit method by setting the ONEBITE bit in the CR3 register */
|
|
|
USARTx->CR3 |= USART_CR3_ONEBIT;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the one bit method by clearing the ONEBITE bit in the CR3 register */
|
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_ONEBIT);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/** @defgroup USART_Group2 Data transfers functions
|
|
|
* @brief Data transfers functions
|
|
|
*
|
|
|
@verbatim
|
|
|
===============================================================================
|
|
|
Data transfers functions
|
|
|
===============================================================================
|
|
|
|
|
|
This subsection provides a set of functions allowing to manage the USART data
|
|
|
transfers.
|
|
|
|
|
|
During an USART reception, data shifts in least significant bit first through
|
|
|
the RX pin. In this mode, the USART_DR register consists of a buffer (RDR)
|
|
|
between the internal bus and the received shift register.
|
|
|
|
|
|
When a transmission is taking place, a write instruction to the USART_DR register
|
|
|
stores the data in the TDR register and which is copied in the shift register
|
|
|
at the end of the current transmission.
|
|
|
|
|
|
The read access of the USART_DR register can be done using the USART_ReceiveData()
|
|
|
function and returns the RDR buffered value. Whereas a write access to the USART_DR
|
|
|
can be done using USART_SendData() function and stores the written data into
|
|
|
TDR buffer.
|
|
|
|
|
|
@endverbatim
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Transmits single data through the USARTx peripheral.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param Data: the data to transmit.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_SendData(USART_TypeDef* USARTx, uint16_t Data)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_DATA(Data));
|
|
|
|
|
|
/* Transmit Data */
|
|
|
USARTx->DR = (Data & (uint16_t)0x01FF);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Returns the most recent received data by the USARTx peripheral.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @retval The received data.
|
|
|
*/
|
|
|
uint16_t USART_ReceiveData(USART_TypeDef* USARTx)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
|
|
|
/* Receive Data */
|
|
|
return (uint16_t)(USARTx->DR & (uint16_t)0x01FF);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/** @defgroup USART_Group3 MultiProcessor Communication functions
|
|
|
* @brief Multi-Processor Communication functions
|
|
|
*
|
|
|
@verbatim
|
|
|
===============================================================================
|
|
|
Multi-Processor Communication functions
|
|
|
===============================================================================
|
|
|
|
|
|
This subsection provides a set of functions allowing to manage the USART
|
|
|
multiprocessor communication.
|
|
|
|
|
|
For instance one of the USARTs can be the master, its TX output is connected to
|
|
|
the RX input of the other USART. The others are slaves, their respective TX outputs
|
|
|
are logically ANDed together and connected to the RX input of the master.
|
|
|
|
|
|
USART multiprocessor communication is possible through the following procedure:
|
|
|
1. Program the Baud rate, Word length = 9 bits, Stop bits, Parity, Mode transmitter
|
|
|
or Mode receiver and hardware flow control values using the USART_Init()
|
|
|
function.
|
|
|
2. Configures the USART address using the USART_SetAddress() function.
|
|
|
3. Configures the wake up method (USART_WakeUp_IdleLine or USART_WakeUp_AddressMark)
|
|
|
using USART_WakeUpConfig() function only for the slaves.
|
|
|
4. Enable the USART using the USART_Cmd() function.
|
|
|
5. Enter the USART slaves in mute mode using USART_ReceiverWakeUpCmd() function.
|
|
|
|
|
|
The USART Slave exit from mute mode when receive the wake up condition.
|
|
|
|
|
|
@endverbatim
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Sets the address of the USART node.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_Address: Indicates the address of the USART node.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_ADDRESS(USART_Address));
|
|
|
|
|
|
/* Clear the USART address */
|
|
|
USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_ADD);
|
|
|
/* Set the USART address node */
|
|
|
USARTx->CR2 |= USART_Address;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Determines if the USART is in mute mode or not.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the USART mute mode.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the USART mute mode by setting the RWU bit in the CR1 register */
|
|
|
USARTx->CR1 |= USART_CR1_RWU;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the USART mute mode by clearing the RWU bit in the CR1 register */
|
|
|
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_RWU);
|
|
|
}
|
|
|
}
|
|
|
/**
|
|
|
* @brief Selects the USART WakeUp method.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_WakeUp: specifies the USART wakeup method.
|
|
|
* This parameter can be one of the following values:
|
|
|
* @arg USART_WakeUp_IdleLine: WakeUp by an idle line detection
|
|
|
* @arg USART_WakeUp_AddressMark: WakeUp by an address mark
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_WAKEUP(USART_WakeUp));
|
|
|
|
|
|
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_WAKE);
|
|
|
USARTx->CR1 |= USART_WakeUp;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/** @defgroup USART_Group4 LIN mode functions
|
|
|
* @brief LIN mode functions
|
|
|
*
|
|
|
@verbatim
|
|
|
===============================================================================
|
|
|
LIN mode functions
|
|
|
===============================================================================
|
|
|
|
|
|
This subsection provides a set of functions allowing to manage the USART LIN
|
|
|
Mode communication.
|
|
|
|
|
|
In LIN mode, 8-bit data format with 1 stop bit is required in accordance with
|
|
|
the LIN standard.
|
|
|
|
|
|
Only this LIN Feature is supported by the USART IP:
|
|
|
- LIN Master Synchronous Break send capability and LIN slave break detection
|
|
|
capability : 13-bit break generation and 10/11 bit break detection
|
|
|
|
|
|
|
|
|
USART LIN Master transmitter communication is possible through the following procedure:
|
|
|
1. Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity,
|
|
|
Mode transmitter or Mode receiver and hardware flow control values using
|
|
|
the USART_Init() function.
|
|
|
2. Enable the USART using the USART_Cmd() function.
|
|
|
3. Enable the LIN mode using the USART_LINCmd() function.
|
|
|
4. Send the break character using USART_SendBreak() function.
|
|
|
|
|
|
USART LIN Master receiver communication is possible through the following procedure:
|
|
|
1. Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity,
|
|
|
Mode transmitter or Mode receiver and hardware flow control values using
|
|
|
the USART_Init() function.
|
|
|
2. Enable the USART using the USART_Cmd() function.
|
|
|
3. Configures the break detection length using the USART_LINBreakDetectLengthConfig()
|
|
|
function.
|
|
|
4. Enable the LIN mode using the USART_LINCmd() function.
|
|
|
|
|
|
|
|
|
@note In LIN mode, the following bits must be kept cleared:
|
|
|
- CLKEN in the USART_CR2 register,
|
|
|
- STOP[1:0], SCEN, HDSEL and IREN in the USART_CR3 register.
|
|
|
|
|
|
@endverbatim
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Sets the USART LIN Break detection length.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_LINBreakDetectLength: specifies the LIN break detection length.
|
|
|
* This parameter can be one of the following values:
|
|
|
* @arg USART_LINBreakDetectLength_10b: 10-bit break detection
|
|
|
* @arg USART_LINBreakDetectLength_11b: 11-bit break detection
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));
|
|
|
|
|
|
USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LBDL);
|
|
|
USARTx->CR2 |= USART_LINBreakDetectLength;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the USART's LIN mode.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the USART LIN mode.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the LIN mode by setting the LINEN bit in the CR2 register */
|
|
|
USARTx->CR2 |= USART_CR2_LINEN;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the LIN mode by clearing the LINEN bit in the CR2 register */
|
|
|
USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LINEN);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Transmits break characters.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_SendBreak(USART_TypeDef* USARTx)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
|
|
|
/* Send break characters */
|
|
|
USARTx->CR1 |= USART_CR1_SBK;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/** @defgroup USART_Group5 Halfduplex mode function
|
|
|
* @brief Half-duplex mode function
|
|
|
*
|
|
|
@verbatim
|
|
|
===============================================================================
|
|
|
Half-duplex mode function
|
|
|
===============================================================================
|
|
|
|
|
|
This subsection provides a set of functions allowing to manage the USART
|
|
|
Half-duplex communication.
|
|
|
|
|
|
The USART can be configured to follow a single-wire half-duplex protocol where
|
|
|
the TX and RX lines are internally connected.
|
|
|
|
|
|
USART Half duplex communication is possible through the following procedure:
|
|
|
1. Program the Baud rate, Word length, Stop bits, Parity, Mode transmitter
|
|
|
or Mode receiver and hardware flow control values using the USART_Init()
|
|
|
function.
|
|
|
2. Configures the USART address using the USART_SetAddress() function.
|
|
|
3. Enable the USART using the USART_Cmd() function.
|
|
|
4. Enable the half duplex mode using USART_HalfDuplexCmd() function.
|
|
|
|
|
|
|
|
|
@note The RX pin is no longer used
|
|
|
@note In Half-duplex mode the following bits must be kept cleared:
|
|
|
- LINEN and CLKEN bits in the USART_CR2 register.
|
|
|
- SCEN and IREN bits in the USART_CR3 register.
|
|
|
|
|
|
@endverbatim
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the USART's Half Duplex communication.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the USART Communication.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
|
|
|
USARTx->CR3 |= USART_CR3_HDSEL;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
|
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_HDSEL);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
|
|
|
/** @defgroup USART_Group6 Smartcard mode functions
|
|
|
* @brief Smartcard mode functions
|
|
|
*
|
|
|
@verbatim
|
|
|
===============================================================================
|
|
|
Smartcard mode functions
|
|
|
===============================================================================
|
|
|
|
|
|
This subsection provides a set of functions allowing to manage the USART
|
|
|
Smartcard communication.
|
|
|
|
|
|
The Smartcard interface is designed to support asynchronous protocol Smartcards as
|
|
|
defined in the ISO 7816-3 standard.
|
|
|
|
|
|
The USART can provide a clock to the smartcard through the SCLK output.
|
|
|
In smartcard mode, SCLK is not associated to the communication but is simply derived
|
|
|
from the internal peripheral input clock through a 5-bit prescaler.
|
|
|
|
|
|
Smartcard communication is possible through the following procedure:
|
|
|
1. Configures the Smartcard Prescaler using the USART_SetPrescaler() function.
|
|
|
2. Configures the Smartcard Guard Time using the USART_SetGuardTime() function.
|
|
|
3. Program the USART clock using the USART_ClockInit() function as following:
|
|
|
- USART Clock enabled
|
|
|
- USART CPOL Low
|
|
|
- USART CPHA on first edge
|
|
|
- USART Last Bit Clock Enabled
|
|
|
4. Program the Smartcard interface using the USART_Init() function as following:
|
|
|
- Word Length = 9 Bits
|
|
|
- 1.5 Stop Bit
|
|
|
- Even parity
|
|
|
- BaudRate = 12096 baud
|
|
|
- Hardware flow control disabled (RTS and CTS signals)
|
|
|
- Tx and Rx enabled
|
|
|
5. Optionally you can enable the parity error interrupt using the USART_ITConfig()
|
|
|
function
|
|
|
6. Enable the USART using the USART_Cmd() function.
|
|
|
7. Enable the Smartcard NACK using the USART_SmartCardNACKCmd() function.
|
|
|
8. Enable the Smartcard interface using the USART_SmartCardCmd() function.
|
|
|
|
|
|
Please refer to the ISO 7816-3 specification for more details.
|
|
|
|
|
|
|
|
|
@note It is also possible to choose 0.5 stop bit for receiving but it is recommended
|
|
|
to use 1.5 stop bits for both transmitting and receiving to avoid switching
|
|
|
between the two configurations.
|
|
|
@note In smartcard mode, the following bits must be kept cleared:
|
|
|
- LINEN bit in the USART_CR2 register.
|
|
|
- HDSEL and IREN bits in the USART_CR3 register.
|
|
|
@note Smartcard mode is available on USART peripherals only (not available on UART4
|
|
|
and UART5 peripherals).
|
|
|
|
|
|
@endverbatim
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Sets the specified USART guard time.
|
|
|
* @param USARTx: where x can be 1, 2, 3 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_GuardTime: specifies the guard time.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_1236_PERIPH(USARTx));
|
|
|
|
|
|
/* Clear the USART Guard time */
|
|
|
USARTx->GTPR &= USART_GTPR_PSC;
|
|
|
/* Set the USART guard time */
|
|
|
USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the USART's Smart Card mode.
|
|
|
* @param USARTx: where x can be 1, 2, 3 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the Smart Card mode.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_1236_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the SC mode by setting the SCEN bit in the CR3 register */
|
|
|
USARTx->CR3 |= USART_CR3_SCEN;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the SC mode by clearing the SCEN bit in the CR3 register */
|
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_SCEN);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables NACK transmission.
|
|
|
* @param USARTx: where x can be 1, 2, 3 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the NACK transmission.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_1236_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the NACK transmission by setting the NACK bit in the CR3 register */
|
|
|
USARTx->CR3 |= USART_CR3_NACK;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
|
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_NACK);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/** @defgroup USART_Group7 IrDA mode functions
|
|
|
* @brief IrDA mode functions
|
|
|
*
|
|
|
@verbatim
|
|
|
===============================================================================
|
|
|
IrDA mode functions
|
|
|
===============================================================================
|
|
|
|
|
|
This subsection provides a set of functions allowing to manage the USART
|
|
|
IrDA communication.
|
|
|
|
|
|
IrDA is a half duplex communication protocol. If the Transmitter is busy, any data
|
|
|
on the IrDA receive line will be ignored by the IrDA decoder and if the Receiver
|
|
|
is busy, data on the TX from the USART to IrDA will not be encoded by IrDA.
|
|
|
While receiving data, transmission should be avoided as the data to be transmitted
|
|
|
could be corrupted.
|
|
|
|
|
|
IrDA communication is possible through the following procedure:
|
|
|
1. Program the Baud rate, Word length = 8 bits, Stop bits, Parity, Transmitter/Receiver
|
|
|
modes and hardware flow control values using the USART_Init() function.
|
|
|
2. Enable the USART using the USART_Cmd() function.
|
|
|
3. Configures the IrDA pulse width by configuring the prescaler using
|
|
|
the USART_SetPrescaler() function.
|
|
|
4. Configures the IrDA USART_IrDAMode_LowPower or USART_IrDAMode_Normal mode
|
|
|
using the USART_IrDAConfig() function.
|
|
|
5. Enable the IrDA using the USART_IrDACmd() function.
|
|
|
|
|
|
@note A pulse of width less than two and greater than one PSC period(s) may or may
|
|
|
not be rejected.
|
|
|
@note The receiver set up time should be managed by software. The IrDA physical layer
|
|
|
specification specifies a minimum of 10 ms delay between transmission and
|
|
|
reception (IrDA is a half duplex protocol).
|
|
|
@note In IrDA mode, the following bits must be kept cleared:
|
|
|
- LINEN, STOP and CLKEN bits in the USART_CR2 register.
|
|
|
- SCEN and HDSEL bits in the USART_CR3 register.
|
|
|
|
|
|
@endverbatim
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Configures the USART's IrDA interface.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_IrDAMode: specifies the IrDA mode.
|
|
|
* This parameter can be one of the following values:
|
|
|
* @arg USART_IrDAMode_LowPower
|
|
|
* @arg USART_IrDAMode_Normal
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
|
|
|
|
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IRLP);
|
|
|
USARTx->CR3 |= USART_IrDAMode;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the USART's IrDA interface.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param NewState: new state of the IrDA mode.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the IrDA mode by setting the IREN bit in the CR3 register */
|
|
|
USARTx->CR3 |= USART_CR3_IREN;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
|
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IREN);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/** @defgroup USART_Group8 DMA transfers management functions
|
|
|
* @brief DMA transfers management functions
|
|
|
*
|
|
|
@verbatim
|
|
|
===============================================================================
|
|
|
DMA transfers management functions
|
|
|
===============================================================================
|
|
|
|
|
|
@endverbatim
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the USART's DMA interface.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_DMAReq: specifies the DMA request.
|
|
|
* This parameter can be any combination of the following values:
|
|
|
* @arg USART_DMAReq_Tx: USART DMA transmit request
|
|
|
* @arg USART_DMAReq_Rx: USART DMA receive request
|
|
|
* @param NewState: new state of the DMA Request sources.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_DMAREQ(USART_DMAReq));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
/* Enable the DMA transfer for selected requests by setting the DMAT and/or
|
|
|
DMAR bits in the USART CR3 register */
|
|
|
USARTx->CR3 |= USART_DMAReq;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* Disable the DMA transfer for selected requests by clearing the DMAT and/or
|
|
|
DMAR bits in the USART CR3 register */
|
|
|
USARTx->CR3 &= (uint16_t)~USART_DMAReq;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/** @defgroup USART_Group9 Interrupts and flags management functions
|
|
|
* @brief Interrupts and flags management functions
|
|
|
*
|
|
|
@verbatim
|
|
|
===============================================================================
|
|
|
Interrupts and flags management functions
|
|
|
===============================================================================
|
|
|
|
|
|
This subsection provides a set of functions allowing to configure the USART
|
|
|
Interrupts sources, DMA channels requests and check or clear the flags or
|
|
|
pending bits status.
|
|
|
The user should identify which mode will be used in his application to manage
|
|
|
the communication: Polling mode, Interrupt mode or DMA mode.
|
|
|
|
|
|
Polling Mode
|
|
|
=============
|
|
|
In Polling Mode, the SPI communication can be managed by 10 flags:
|
|
|
1. USART_FLAG_TXE : to indicate the status of the transmit buffer register
|
|
|
2. USART_FLAG_RXNE : to indicate the status of the receive buffer register
|
|
|
3. USART_FLAG_TC : to indicate the status of the transmit operation
|
|
|
4. USART_FLAG_IDLE : to indicate the status of the Idle Line
|
|
|
5. USART_FLAG_CTS : to indicate the status of the nCTS input
|
|
|
6. USART_FLAG_LBD : to indicate the status of the LIN break detection
|
|
|
7. USART_FLAG_NE : to indicate if a noise error occur
|
|
|
8. USART_FLAG_FE : to indicate if a frame error occur
|
|
|
9. USART_FLAG_PE : to indicate if a parity error occur
|
|
|
10. USART_FLAG_ORE : to indicate if an Overrun error occur
|
|
|
|
|
|
In this Mode it is advised to use the following functions:
|
|
|
- FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG);
|
|
|
- void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG);
|
|
|
|
|
|
Interrupt Mode
|
|
|
===============
|
|
|
In Interrupt Mode, the USART communication can be managed by 8 interrupt sources
|
|
|
and 10 pending bits:
|
|
|
|
|
|
Pending Bits:
|
|
|
-------------
|
|
|
1. USART_IT_TXE : to indicate the status of the transmit buffer register
|
|
|
2. USART_IT_RXNE : to indicate the status of the receive buffer register
|
|
|
3. USART_IT_TC : to indicate the status of the transmit operation
|
|
|
4. USART_IT_IDLE : to indicate the status of the Idle Line
|
|
|
5. USART_IT_CTS : to indicate the status of the nCTS input
|
|
|
6. USART_IT_LBD : to indicate the status of the LIN break detection
|
|
|
7. USART_IT_NE : to indicate if a noise error occur
|
|
|
8. USART_IT_FE : to indicate if a frame error occur
|
|
|
9. USART_IT_PE : to indicate if a parity error occur
|
|
|
10. USART_IT_ORE : to indicate if an Overrun error occur
|
|
|
|
|
|
Interrupt Source:
|
|
|
-----------------
|
|
|
1. USART_IT_TXE : specifies the interrupt source for the Tx buffer empty
|
|
|
interrupt.
|
|
|
2. USART_IT_RXNE : specifies the interrupt source for the Rx buffer not
|
|
|
empty interrupt.
|
|
|
3. USART_IT_TC : specifies the interrupt source for the Transmit complete
|
|
|
interrupt.
|
|
|
4. USART_IT_IDLE : specifies the interrupt source for the Idle Line interrupt.
|
|
|
5. USART_IT_CTS : specifies the interrupt source for the CTS interrupt.
|
|
|
6. USART_IT_LBD : specifies the interrupt source for the LIN break detection
|
|
|
interrupt.
|
|
|
7. USART_IT_PE : specifies the interrupt source for the parity error interrupt.
|
|
|
8. USART_IT_ERR : specifies the interrupt source for the errors interrupt.
|
|
|
|
|
|
@note Some parameters are coded in order to use them as interrupt source or as pending bits.
|
|
|
|
|
|
In this Mode it is advised to use the following functions:
|
|
|
- void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);
|
|
|
- ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT);
|
|
|
- void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT);
|
|
|
|
|
|
DMA Mode
|
|
|
========
|
|
|
In DMA Mode, the USART communication can be managed by 2 DMA Channel requests:
|
|
|
1. USART_DMAReq_Tx: specifies the Tx buffer DMA transfer request
|
|
|
2. USART_DMAReq_Rx: specifies the Rx buffer DMA transfer request
|
|
|
|
|
|
In this Mode it is advised to use the following function:
|
|
|
- void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);
|
|
|
|
|
|
@endverbatim
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Enables or disables the specified USART interrupts.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_IT: specifies the USART interrupt sources to be enabled or disabled.
|
|
|
* This parameter can be one of the following values:
|
|
|
* @arg USART_IT_CTS: CTS change interrupt
|
|
|
* @arg USART_IT_LBD: LIN Break detection interrupt
|
|
|
* @arg USART_IT_TXE: Transmit Data Register empty interrupt
|
|
|
* @arg USART_IT_TC: Transmission complete interrupt
|
|
|
* @arg USART_IT_RXNE: Receive Data register not empty interrupt
|
|
|
* @arg USART_IT_IDLE: Idle line detection interrupt
|
|
|
* @arg USART_IT_PE: Parity Error interrupt
|
|
|
* @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)
|
|
|
* @param NewState: new state of the specified USARTx interrupts.
|
|
|
* This parameter can be: ENABLE or DISABLE.
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState)
|
|
|
{
|
|
|
uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00;
|
|
|
uint32_t usartxbase = 0x00;
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_CONFIG_IT(USART_IT));
|
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
|
|
|
|
|
/* The CTS interrupt is not available for UART4 and UART5 */
|
|
|
if (USART_IT == USART_IT_CTS)
|
|
|
{
|
|
|
assert_param(IS_USART_1236_PERIPH(USARTx));
|
|
|
}
|
|
|
|
|
|
usartxbase = (uint32_t)USARTx;
|
|
|
|
|
|
/* Get the USART register index */
|
|
|
usartreg = (((uint8_t)USART_IT) >> 0x05);
|
|
|
|
|
|
/* Get the interrupt position */
|
|
|
itpos = USART_IT & IT_MASK;
|
|
|
itmask = (((uint32_t)0x01) << itpos);
|
|
|
|
|
|
if (usartreg == 0x01) /* The IT is in CR1 register */
|
|
|
{
|
|
|
usartxbase += 0x0C;
|
|
|
}
|
|
|
else if (usartreg == 0x02) /* The IT is in CR2 register */
|
|
|
{
|
|
|
usartxbase += 0x10;
|
|
|
}
|
|
|
else /* The IT is in CR3 register */
|
|
|
{
|
|
|
usartxbase += 0x14;
|
|
|
}
|
|
|
if (NewState != DISABLE)
|
|
|
{
|
|
|
*(__IO uint32_t*)usartxbase |= itmask;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
*(__IO uint32_t*)usartxbase &= ~itmask;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Checks whether the specified USART flag is set or not.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_FLAG: specifies the flag to check.
|
|
|
* This parameter can be one of the following values:
|
|
|
* @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5)
|
|
|
* @arg USART_FLAG_LBD: LIN Break detection flag
|
|
|
* @arg USART_FLAG_TXE: Transmit data register empty flag
|
|
|
* @arg USART_FLAG_TC: Transmission Complete flag
|
|
|
* @arg USART_FLAG_RXNE: Receive data register not empty flag
|
|
|
* @arg USART_FLAG_IDLE: Idle Line detection flag
|
|
|
* @arg USART_FLAG_ORE: OverRun Error flag
|
|
|
* @arg USART_FLAG_NE: Noise Error flag
|
|
|
* @arg USART_FLAG_FE: Framing Error flag
|
|
|
* @arg USART_FLAG_PE: Parity Error flag
|
|
|
* @retval The new state of USART_FLAG (SET or RESET).
|
|
|
*/
|
|
|
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG)
|
|
|
{
|
|
|
FlagStatus bitstatus = RESET;
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_FLAG(USART_FLAG));
|
|
|
|
|
|
/* The CTS flag is not available for UART4 and UART5 */
|
|
|
if (USART_FLAG == USART_FLAG_CTS)
|
|
|
{
|
|
|
assert_param(IS_USART_1236_PERIPH(USARTx));
|
|
|
}
|
|
|
|
|
|
if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET)
|
|
|
{
|
|
|
bitstatus = SET;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
bitstatus = RESET;
|
|
|
}
|
|
|
return bitstatus;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Clears the USARTx's pending flags.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_FLAG: specifies the flag to clear.
|
|
|
* This parameter can be any combination of the following values:
|
|
|
* @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5).
|
|
|
* @arg USART_FLAG_LBD: LIN Break detection flag.
|
|
|
* @arg USART_FLAG_TC: Transmission Complete flag.
|
|
|
* @arg USART_FLAG_RXNE: Receive data register not empty flag.
|
|
|
*
|
|
|
* @note PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
|
|
|
* error) and IDLE (Idle line detected) flags are cleared by software
|
|
|
* sequence: a read operation to USART_SR register (USART_GetFlagStatus())
|
|
|
* followed by a read operation to USART_DR register (USART_ReceiveData()).
|
|
|
* @note RXNE flag can be also cleared by a read to the USART_DR register
|
|
|
* (USART_ReceiveData()).
|
|
|
* @note TC flag can be also cleared by software sequence: a read operation to
|
|
|
* USART_SR register (USART_GetFlagStatus()) followed by a write operation
|
|
|
* to USART_DR register (USART_SendData()).
|
|
|
* @note TXE flag is cleared only by a write to the USART_DR register
|
|
|
* (USART_SendData()).
|
|
|
*
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG)
|
|
|
{
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
|
|
|
|
|
|
/* The CTS flag is not available for UART4 and UART5 */
|
|
|
if ((USART_FLAG & USART_FLAG_CTS) == USART_FLAG_CTS)
|
|
|
{
|
|
|
assert_param(IS_USART_1236_PERIPH(USARTx));
|
|
|
}
|
|
|
|
|
|
USARTx->SR = (uint16_t)~USART_FLAG;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Checks whether the specified USART interrupt has occurred or not.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_IT: specifies the USART interrupt source to check.
|
|
|
* This parameter can be one of the following values:
|
|
|
* @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
|
|
|
* @arg USART_IT_LBD: LIN Break detection interrupt
|
|
|
* @arg USART_IT_TXE: Transmit Data Register empty interrupt
|
|
|
* @arg USART_IT_TC: Transmission complete interrupt
|
|
|
* @arg USART_IT_RXNE: Receive Data register not empty interrupt
|
|
|
* @arg USART_IT_IDLE: Idle line detection interrupt
|
|
|
* @arg USART_IT_ORE: OverRun Error interrupt
|
|
|
* @arg USART_IT_NE: Noise Error interrupt
|
|
|
* @arg USART_IT_FE: Framing Error interrupt
|
|
|
* @arg USART_IT_PE: Parity Error interrupt
|
|
|
* @retval The new state of USART_IT (SET or RESET).
|
|
|
*/
|
|
|
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT)
|
|
|
{
|
|
|
uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
|
|
|
ITStatus bitstatus = RESET;
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_GET_IT(USART_IT));
|
|
|
|
|
|
/* The CTS interrupt is not available for UART4 and UART5 */
|
|
|
if (USART_IT == USART_IT_CTS)
|
|
|
{
|
|
|
assert_param(IS_USART_1236_PERIPH(USARTx));
|
|
|
}
|
|
|
|
|
|
/* Get the USART register index */
|
|
|
usartreg = (((uint8_t)USART_IT) >> 0x05);
|
|
|
/* Get the interrupt position */
|
|
|
itmask = USART_IT & IT_MASK;
|
|
|
itmask = (uint32_t)0x01 << itmask;
|
|
|
|
|
|
if (usartreg == 0x01) /* The IT is in CR1 register */
|
|
|
{
|
|
|
itmask &= USARTx->CR1;
|
|
|
}
|
|
|
else if (usartreg == 0x02) /* The IT is in CR2 register */
|
|
|
{
|
|
|
itmask &= USARTx->CR2;
|
|
|
}
|
|
|
else /* The IT is in CR3 register */
|
|
|
{
|
|
|
itmask &= USARTx->CR3;
|
|
|
}
|
|
|
|
|
|
bitpos = USART_IT >> 0x08;
|
|
|
bitpos = (uint32_t)0x01 << bitpos;
|
|
|
bitpos &= USARTx->SR;
|
|
|
if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))
|
|
|
{
|
|
|
bitstatus = SET;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
bitstatus = RESET;
|
|
|
}
|
|
|
|
|
|
return bitstatus;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @brief Clears the USARTx's interrupt pending bits.
|
|
|
* @param USARTx: where x can be 1, 2, 3, 4, 5 or 6 to select the USART or
|
|
|
* UART peripheral.
|
|
|
* @param USART_IT: specifies the interrupt pending bit to clear.
|
|
|
* This parameter can be one of the following values:
|
|
|
* @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
|
|
|
* @arg USART_IT_LBD: LIN Break detection interrupt
|
|
|
* @arg USART_IT_TC: Transmission complete interrupt.
|
|
|
* @arg USART_IT_RXNE: Receive Data register not empty interrupt.
|
|
|
*
|
|
|
* @note PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
|
|
|
* error) and IDLE (Idle line detected) pending bits are cleared by
|
|
|
* software sequence: a read operation to USART_SR register
|
|
|
* (USART_GetITStatus()) followed by a read operation to USART_DR register
|
|
|
* (USART_ReceiveData()).
|
|
|
* @note RXNE pending bit can be also cleared by a read to the USART_DR register
|
|
|
* (USART_ReceiveData()).
|
|
|
* @note TC pending bit can be also cleared by software sequence: a read
|
|
|
* operation to USART_SR register (USART_GetITStatus()) followed by a write
|
|
|
* operation to USART_DR register (USART_SendData()).
|
|
|
* @note TXE pending bit is cleared only by a write to the USART_DR register
|
|
|
* (USART_SendData()).
|
|
|
*
|
|
|
* @retval None
|
|
|
*/
|
|
|
void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT)
|
|
|
{
|
|
|
uint16_t bitpos = 0x00, itmask = 0x00;
|
|
|
/* Check the parameters */
|
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
|
|
assert_param(IS_USART_CLEAR_IT(USART_IT));
|
|
|
|
|
|
/* The CTS interrupt is not available for UART4 and UART5 */
|
|
|
if (USART_IT == USART_IT_CTS)
|
|
|
{
|
|
|
assert_param(IS_USART_1236_PERIPH(USARTx));
|
|
|
}
|
|
|
|
|
|
bitpos = USART_IT >> 0x08;
|
|
|
itmask = ((uint16_t)0x01 << (uint16_t)bitpos);
|
|
|
USARTx->SR = (uint16_t)~itmask;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @}
|
|
|
*/
|
|
|
|
|
|
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
|
|
|
|
