258 lines
6.3 KiB
C
258 lines
6.3 KiB
C
/*
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* File : usart.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006-2013, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2016-08-30 Aubr.Cool the first version
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*/
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#include <stm32l0xx.h>
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#include <rtdevice.h>
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#include <board.h>
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#include "usart.h"
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/* USART1 */
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#ifdef RT_USING_UART1
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#define UART1_GPIO GPIOA
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#endif
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/* STM32 uart driver */
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struct stm32_uart
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{
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USART_TypeDef* uart_device;
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IRQn_Type irq;
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};
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typedef struct {
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USART_TypeDef *Instance;
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} stm32_hw_uart_def;
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static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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UART_HandleTypeDef huart1;
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RT_ASSERT(serial != RT_NULL);
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RT_ASSERT(cfg != RT_NULL);
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struct stm32_uart* uart;
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uart = (struct stm32_uart *)serial->parent.user_data;
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huart1.Instance = uart->uart_device;
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huart1.Init.BaudRate = cfg->baud_rate;
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switch(cfg->data_bits) {
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case DATA_BITS_7:
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if(!cfg->parity) {
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huart1.Init.WordLength = UART_WORDLENGTH_7B;
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} else {
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huart1.Init.WordLength = UART_WORDLENGTH_8B;
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}
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break;
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case DATA_BITS_8:
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if(!cfg->parity) {
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huart1.Init.WordLength = UART_WORDLENGTH_8B;
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} else {
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huart1.Init.WordLength = UART_WORDLENGTH_9B;
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}
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break;
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case DATA_BITS_9:
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if(!cfg->parity) {
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huart1.Init.WordLength = UART_WORDLENGTH_9B;
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} else {
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return RT_EIO;
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}
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break;
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default:
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return RT_EIO;
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}
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switch(cfg->stop_bits) {
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case STOP_BITS_1:
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huart1.Init.StopBits = UART_STOPBITS_1;
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break;
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case STOP_BITS_2:
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huart1.Init.StopBits = UART_STOPBITS_2;
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break;
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default:
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return RT_EIO;
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}
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switch(cfg->parity) {
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case PARITY_NONE:
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huart1.Init.Parity = UART_PARITY_NONE;
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break;
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case PARITY_ODD:
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huart1.Init.Parity = UART_PARITY_ODD;
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break;
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case PARITY_EVEN:
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huart1.Init.Parity = UART_PARITY_EVEN;
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break;
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default:
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return RT_EIO;
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}
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huart1.Init.Mode = UART_MODE_TX_RX;
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huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
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huart1.Init.OverSampling = UART_OVERSAMPLING_16;
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huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
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huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
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if (HAL_UART_Init(&huart1) != HAL_OK)
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{
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return RT_EIO;
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}
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return RT_EOK;
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}
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static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *arg)
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{
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struct stm32_uart* uart;
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stm32_hw_uart_def huart1;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct stm32_uart *)serial->parent.user_data;
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huart1.Instance = uart->uart_device;
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CLR_INT:
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__HAL_UART_DISABLE_IT((&huart1), UART_IT_RXNE);
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break;
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case RT_DEVICE_CTRL_SET_INT:
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/* enable rx irq */
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__HAL_UART_ENABLE_IT((&huart1), UART_IT_RXNE);
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break;
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}
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return RT_EOK;
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}
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static int stm32_putc(struct rt_serial_device *serial, char c)
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{
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struct stm32_uart* uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct stm32_uart *)serial->parent.user_data;
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stm32_hw_uart_def huart1;
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huart1.Instance = uart->uart_device;
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if(serial->parent.open_flag & RT_DEVICE_FLAG_INT_TX) {
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if(!(uart->uart_device->ISR & UART_FLAG_TXE)) {
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__HAL_UART_ENABLE_IT((&huart1), UART_IT_TC);
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return -1;
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}
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uart->uart_device->TDR = c;
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__HAL_UART_ENABLE_IT((&huart1), UART_IT_TC);
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} else {
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while(!(uart->uart_device->ISR & UART_FLAG_TXE));
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uart->uart_device->TDR = c;
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}
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return 1;
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}
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static int stm32_getc(struct rt_serial_device *serial)
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{
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int ch;
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struct stm32_uart* uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct stm32_uart *)serial->parent.user_data;
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ch = -1;
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if (uart->uart_device->ISR & UART_FLAG_RXNE)
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{
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ch = uart->uart_device->RDR & 0xff;
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}
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return ch;
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}
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static const struct rt_uart_ops stm32_uart_ops =
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{
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stm32_configure,
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stm32_control,
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stm32_putc,
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stm32_getc,
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};
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#if defined(RT_USING_UART1)
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/* UART1 device driver structure */
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struct stm32_uart uart1 =
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{
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USART1,
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USART1_IRQn,
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};
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struct rt_serial_device serial1;
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void USART1_IRQHandler(void)
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{
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struct stm32_uart* uart;
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uart = &uart1;
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stm32_hw_uart_def huart1;
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huart1.Instance = uart->uart_device;
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/* enter interrupt */
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rt_interrupt_enter();
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if(__HAL_UART_GET_IT(&huart1, UART_IT_RXNE))// RXIRQ
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{
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rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_RX_IND);
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}
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if (__HAL_UART_GET_IT(&huart1, UART_IT_TC))
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{
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/* clear interrupt */
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__HAL_UART_DISABLE_IT((&huart1), UART_IT_TC);
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__HAL_UART_CLEAR_IT(&huart1, UART_CLEAR_TCF);
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rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_TX_DONE);
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}
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif /* RT_USING_UART1 */
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static void RCC_Configuration(void)
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{
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#ifdef RT_USING_UART1
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__HAL_RCC_GPIOA_CLK_ENABLE();
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__HAL_RCC_USART1_CLK_ENABLE();
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#endif /* RT_USING_UART1 */
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}
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static void GPIO_Configuration(void)
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{
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#ifdef RT_USING_UART1
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{
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rt_uint32_t mode;
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mode = (UART1_GPIO_AF << 8) | GPIO_MODE_AF_PP;
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stm32_pin_mode_early(UART1_GPIO_TX, mode);
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stm32_pin_mode_early(UART1_GPIO_RX, mode);
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}
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#endif /* RT_USING_UART1 */
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}
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static void NVIC_Configuration(struct stm32_uart* uart)
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{
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HAL_NVIC_SetPriority(uart->irq, 0, 0);
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UART_ENABLE_IRQ(uart->irq);
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}
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int rt_hw_usart_init(void)
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{
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struct stm32_uart* uart;
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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RCC_Configuration();
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GPIO_Configuration();
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#ifdef RT_USING_UART1
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uart = &uart1;
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config.baud_rate = BAUD_RATE_115200;
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serial1.ops = &stm32_uart_ops;
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serial1.config = config;
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NVIC_Configuration(&uart1);
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/* register UART1 device */
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rt_hw_serial_register(&serial1, "uart1",
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RT_DEVICE_FLAG_RDWR |
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RT_DEVICE_FLAG_INT_RX |
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RT_DEVICE_FLAG_INT_TX,
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uart);
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#endif /* RT_USING_UART1 */
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return 0;
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}
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INIT_BOARD_EXPORT(rt_hw_usart_init);
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