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usbd_cdc_vcp.c
381 lines | 11.5 KiB | text/x-c | CLexer
/**
******************************************************************************
* @file usbd_cdc_vcp.c
* @author MCD Application Team
* @version V1.1.0
* @date 19-March-2012
* @brief Generic media access Layer.
******************************************************************************
* @attention
*
* <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED
#pragma data_alignment = 4
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */
/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_vcp.h"
#include "usb_conf.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
LINE_CODING linecoding =
{
115200, /* baud rate*/
0x00, /* stop bits-1*/
0x00, /* parity - none*/
0x08 /* nb. of bits 8*/
};
USART_InitTypeDef USART_InitStructure;
/* These are external variables imported from CDC core to be used for IN
transfer management. */
extern uint8_t APP_Rx_Buffer []; /* Write CDC received data in this buffer.
These data will be sent over USB IN endpoint
in the CDC core functions. */
extern uint32_t APP_Rx_ptr_in; /* Increment this pointer or roll it back to
start address when writing received data
in the buffer APP_Rx_Buffer. */
/* Private function prototypes -----------------------------------------------*/
static uint16_t VCP_Init (void);
static uint16_t VCP_DeInit (void);
static uint16_t VCP_Ctrl (uint32_t Cmd, uint8_t* Buf, uint32_t Len);
static uint16_t VCP_DataTx (uint8_t* Buf, uint32_t Len);
static uint16_t VCP_DataRx (uint8_t* Buf, uint32_t Len);
static uint16_t VCP_COMConfig(uint8_t Conf);
CDC_IF_Prop_TypeDef VCP_fops =
{
VCP_Init,
VCP_DeInit,
VCP_Ctrl,
VCP_DataTx,
VCP_DataRx
};
/* Private functions ---------------------------------------------------------*/
/**
* @brief VCP_Init
* Initializes the Media on the STM32
* @param None
* @retval Result of the opeartion (USBD_OK in all cases)
*/
static uint16_t VCP_Init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* EVAL_COM1 default configuration */
/* EVAL_COM1 configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- Parity Odd
- Hardware flow control disabled
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_Odd;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* Configure and enable the USART */
STM_EVAL_COMInit(COM1, &USART_InitStructure);
/* Enable the USART Receive interrupt */
USART_ITConfig(EVAL_COM1, USART_IT_RXNE, ENABLE);
/* Enable USART Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = EVAL_COM1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
return USBD_OK;
}
/**
* @brief VCP_DeInit
* DeInitializes the Media on the STM32
* @param None
* @retval Result of the opeartion (USBD_OK in all cases)
*/
static uint16_t VCP_DeInit(void)
{
return USBD_OK;
}
/**
* @brief VCP_Ctrl
* Manage the CDC class requests
* @param Cmd: Command code
* @param Buf: Buffer containing command data (request parameters)
* @param Len: Number of data to be sent (in bytes)
* @retval Result of the opeartion (USBD_OK in all cases)
*/
static uint16_t VCP_Ctrl (uint32_t Cmd, uint8_t* Buf, uint32_t Len)
{
switch (Cmd)
{
case SEND_ENCAPSULATED_COMMAND:
/* Not needed for this driver */
break;
case GET_ENCAPSULATED_RESPONSE:
/* Not needed for this driver */
break;
case SET_COMM_FEATURE:
/* Not needed for this driver */
break;
case GET_COMM_FEATURE:
/* Not needed for this driver */
break;
case CLEAR_COMM_FEATURE:
/* Not needed for this driver */
break;
case SET_LINE_CODING:
linecoding.bitrate = (uint32_t)(Buf[0] | (Buf[1] << 8) | (Buf[2] << 16) | (Buf[3] << 24));
linecoding.format = Buf[4];
linecoding.paritytype = Buf[5];
linecoding.datatype = Buf[6];
/* Set the new configuration */
VCP_COMConfig(OTHER_CONFIG);
break;
case GET_LINE_CODING:
Buf[0] = (uint8_t)(linecoding.bitrate);
Buf[1] = (uint8_t)(linecoding.bitrate >> 8);
Buf[2] = (uint8_t)(linecoding.bitrate >> 16);
Buf[3] = (uint8_t)(linecoding.bitrate >> 24);
Buf[4] = linecoding.format;
Buf[5] = linecoding.paritytype;
Buf[6] = linecoding.datatype;
break;
case SET_CONTROL_LINE_STATE:
/* Not needed for this driver */
break;
case SEND_BREAK:
/* Not needed for this driver */
break;
default:
break;
}
return USBD_OK;
}
/**
* @brief VCP_DataTx
* CDC received data to be send over USB IN endpoint are managed in
* this function.
* @param Buf: Buffer of data to be sent
* @param Len: Number of data to be sent (in bytes)
* @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
*/
static uint16_t VCP_DataTx (uint8_t* Buf, uint32_t Len)
{
if (linecoding.datatype == 7)
{
APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1) & 0x7F;
}
else if (linecoding.datatype == 8)
{
APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1);
}
APP_Rx_ptr_in++;
/* To avoid buffer overflow */
if(APP_Rx_ptr_in == APP_RX_DATA_SIZE)
{
APP_Rx_ptr_in = 0;
}
return USBD_OK;
}
/**
* @brief VCP_DataRx
* Data received over USB OUT endpoint are sent over CDC interface
* through this function.
*
* @note
* This function will block any OUT packet reception on USB endpoint
* untill exiting this function. If you exit this function before transfer
* is complete on CDC interface (ie. using DMA controller) it will result
* in receiving more data while previous ones are still not sent.
*
* @param Buf: Buffer of data to be received
* @param Len: Number of data received (in bytes)
* @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
*/
static uint16_t VCP_DataRx (uint8_t* Buf, uint32_t Len)
{
uint32_t i;
for (i = 0; i < Len; i++)
{
USART_SendData(EVAL_COM1, *(Buf + i) );
while(USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TXE) == RESET);
}
return USBD_OK;
}
/**
* @brief VCP_COMConfig
* Configure the COM Port with default values or values received from host.
* @param Conf: can be DEFAULT_CONFIG to set the default configuration or OTHER_CONFIG
* to set a configuration received from the host.
* @retval None.
*/
static uint16_t VCP_COMConfig(uint8_t Conf)
{
if (Conf == DEFAULT_CONFIG)
{
/* EVAL_COM1 default configuration */
/* EVAL_COM1 configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- Parity Odd
- Hardware flow control disabled
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_Odd;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* Configure and enable the USART */
STM_EVAL_COMInit(COM1, &USART_InitStructure);
/* Enable the USART Receive interrupt */
USART_ITConfig(EVAL_COM1, USART_IT_RXNE, ENABLE);
}
else
{
/* set the Stop bit*/
switch (linecoding.format)
{
case 0:
USART_InitStructure.USART_StopBits = USART_StopBits_1;
break;
case 1:
USART_InitStructure.USART_StopBits = USART_StopBits_1_5;
break;
case 2:
USART_InitStructure.USART_StopBits = USART_StopBits_2;
break;
default :
VCP_COMConfig(DEFAULT_CONFIG);
return (USBD_FAIL);
}
/* set the parity bit*/
switch (linecoding.paritytype)
{
case 0:
USART_InitStructure.USART_Parity = USART_Parity_No;
break;
case 1:
USART_InitStructure.USART_Parity = USART_Parity_Even;
break;
case 2:
USART_InitStructure.USART_Parity = USART_Parity_Odd;
break;
default :
VCP_COMConfig(DEFAULT_CONFIG);
return (USBD_FAIL);
}
/*set the data type : only 8bits and 9bits is supported */
switch (linecoding.datatype)
{
case 0x07:
/* With this configuration a parity (Even or Odd) should be set */
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
break;
case 0x08:
if (USART_InitStructure.USART_Parity == USART_Parity_No)
{
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
}
else
{
USART_InitStructure.USART_WordLength = USART_WordLength_9b;
}
break;
default :
VCP_COMConfig(DEFAULT_CONFIG);
return (USBD_FAIL);
}
USART_InitStructure.USART_BaudRate = linecoding.bitrate;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* Configure and enable the USART */
STM_EVAL_COMInit(COM1, &USART_InitStructure);
}
return USBD_OK;
}
/**
* @brief EVAL_COM_IRQHandler
*
* @param None.
* @retval None.
*/
void EVAL_COM_IRQHandler(void)
{
if (USART_GetITStatus(EVAL_COM1, USART_IT_RXNE) != RESET)
{
/* Send the received data to the PC Host*/
VCP_DataTx (0,0);
}
/* If overrun condition occurs, clear the ORE flag and recover communication */
if (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_ORE) != RESET)
{
(void)USART_ReceiveData(EVAL_COM1);
}
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/