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/*------------------------------------------------------------------------------
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-- This file is a part of the libuc, microcontroler library
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-- Copyright (C) 2011, Alexis Jeandet
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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-- Author : Alexis Jeandet
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-- Mail : alexis.jeandet@gmail.com
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-------------------------------------------------------------------------------*/
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#include <uart.h>
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#include <stm32f4xx_usart.h>
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#include <stm32f4xx_rcc.h>
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int uartopen(int count ,uart_t* uart)
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{
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switch(count)
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{
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case 0:
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uart->_dev = (void*)USART1;
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
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break;
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case 1:
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uart->_dev = (void*)USART2;
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
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break;
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case 2:
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uart->_dev = (void*)USART3;
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
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break;
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case 3:
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uart->_dev = (void*)UART4;
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE);
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break;
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case 4:
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uart->_dev = (void*)UART5;
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, DISABLE);
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break;
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case 5:
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uart->_dev = (void*)USART6;
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART6, ENABLE);
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART6, DISABLE);
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break;
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default:
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break;
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}
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((USART_TypeDef *)(uart->_dev))->CR3 &= ~((1<<8) + (1<<9));
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return 1;
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}
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int uartclose(uart_t* uart)
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{
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switch((int)uart->_dev)
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{
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case (int)(void*)USART1:
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uart->_dev = (void*)USART1;
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
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break;
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case (int)(void*)USART2:
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uart->_dev = (void*)USART2;
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
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break;
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case (int)(void*)USART3:
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uart->_dev = (void*)USART3;
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
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break;
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case (int)(void*)UART4:
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uart->_dev = (void*)UART4;
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
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break;
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case (int)(void*)UART5:
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uart->_dev = (void*)UART5;
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE);
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break;
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case (int)(void*)USART6:
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uart->_dev = (void*)USART6;
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART6, ENABLE);
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break;
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default:
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break;
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}
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return 1;
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}
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int uartsetconfig(uart_t* uart)
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{
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int res=1;
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uartdisable(uart);
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uartsetspeed(uart,uart->speed);
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uartsetparity(uart,uart->cfg & UARTPARITYMASK);
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uartsetdatabits(uart,uart->cfg & UARTBITSMASK);
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uartsetstopbits(uart,uart->cfg & UARTSTOPBITSMASK);
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uartenable(uart);
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return res;
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}
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int uartenable(uart_t* uart)
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{
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((USART_TypeDef *)(uart->_dev))->CR1 |= (1<<2) + (1<<3) + (1<<13);
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return 1;
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}
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int uartdisable(uart_t* uart)
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{
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((USART_TypeDef *)(uart->_dev))->CR1 &= ~((1<<2) + (1<<3) +(1<<13));
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return 1;
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}
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int uartsetspeed(uart_t* uart,int speed)
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{
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uart->speed = speed;
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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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RCC_GetClocksFreq(&RCC_ClocksStatus);
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if (((USART_TypeDef *)(uart->_dev) == USART1) || (((USART_TypeDef *)(uart->_dev) == 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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if (((((USART_TypeDef *)(uart->_dev))->CR1) & USART_CR1_OVER8) != 0)
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{
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integerdivider = ((25 * apbclock) / (2 * (speed)));
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}
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else
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{
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integerdivider = ((25 * apbclock) / (4 * (speed)));
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}
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tmpreg = (integerdivider / 100) << 4;
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fractionaldivider = integerdivider - (100 * (tmpreg >> 4));
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if ((((USART_TypeDef *)(uart->_dev))->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
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{
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tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);
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}
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((USART_TypeDef *)(uart->_dev))->BRR = (uint16_t)tmpreg;
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return 1;
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}
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int uartsetparity(uart_t* uart,uartparity_t parity)
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{
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uart->cfg &= (UARTPARITYMASK ^ -1);
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uart->cfg |= parity;
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((USART_TypeDef *)(uart->_dev))->CR1 &= (((1<<9)+(1<<10)) ^ -1);
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switch(parity)
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{
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case uartparityeven:
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((USART_TypeDef *)(uart->_dev))->CR1 |= (1<<10);
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break;
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case uartparityodd:
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((USART_TypeDef *)(uart->_dev))->CR1 |= (1<<10) + (1<<9);
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break;
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case uartparitynone:
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break;
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default :
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return 0;
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break;
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}
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return 1;
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}
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int uartsetdatabits(uart_t* uart,uartbits_t databits)
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{
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uart->cfg &= UARTBITSMASK ^-1;
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uart->cfg |= databits;
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((USART_TypeDef *)(uart->_dev))->CR1 &= (((1<<12)) ^ -1);
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switch(databits)
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{
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case uart7bits:
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return 0;
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break;
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case uart8bits:
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break;
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case uart9bits:
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((USART_TypeDef *)(uart->_dev))->CR1 |= (1<<12);
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break;
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default :
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return 0;
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break;
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}
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return 1;
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}
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int uartsetstopbits(uart_t* uart,uartstopbits_t stopbits)
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{
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uart->cfg &= UARTSTOPBITSMASK ^-1;
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uart->cfg |= stopbits;
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((USART_TypeDef *)(uart->_dev))->CR2 &= (((1<<12)+(1<<13)) ^ -1);
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switch(stopbits)
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{
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case uarthalfstop:
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((USART_TypeDef *)(uart->_dev))->CR2 |= (1<<12);
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break;
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case uartonestop:
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break;
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case uartonehalfstop:
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((USART_TypeDef *)(uart->_dev))->CR2 |= (1<<12) + (1<<13);
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break;
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case uarttwostop:
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((USART_TypeDef *)(uart->_dev))->CR2 |= (1<<13);
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break;
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default :
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return 0;
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break;
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}
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return 1;
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}
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int uartputc(uart_t* uart,char c)
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{
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((USART_TypeDef *)(uart->_dev))->DR = c;
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while((((USART_TypeDef *)(uart->_dev))->SR & (1<<7))!=(1<<7));
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return 1;
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}
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char uartgetc(uart_t* uart)
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{
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while(!(((USART_TypeDef *)(uart->_dev))->SR & (1<<5)));
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return (char)((USART_TypeDef *)(uart->_dev))->DR;
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}
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int uartputs(uart_t* uart,char* s)
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{
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while (*s) uartputc(uart,*s++);
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return 1;
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}
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int uartgets(uart_t* uart,char* s)
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{
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do
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{
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(*s) = uartgetc(uart);
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}
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while(*s++);
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return 1;
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}
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int uartputnc(uart_t* uart,char* c,int n)
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{
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while(n)
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{
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uartputc(uart,c[n]);
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n--;
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}
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return 1;
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}
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int uartgetnc(uart_t* uart,char* c,int n)
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{
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while(n)
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{
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c[n]=uartgetc(uart);
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n--;
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}
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return 1;
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}
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int uartavailiabledata(uart_t* uart)
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{
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if(!(((USART_TypeDef *)(uart->_dev))->SR & (1<<5)))
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return 0;
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else
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return 1;
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}
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