307 lines
7.9 KiB
C
307 lines
7.9 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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* 2013-11-15 bright the first version
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*/
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#include <stm32f0xx.h>
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#include <rtdevice.h>
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#include "usart.h"
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/* USART1 */
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#define UART1_GPIO_TX GPIO_Pin_9
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#define UART1_GPIO_TX_SOURCE GPIO_PinSource9
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#define UART1_GPIO_RX GPIO_Pin_10
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#define UART1_GPIO_RX_SOURCE GPIO_PinSource10
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#define UART1_GPIO_AF GPIO_AF_1
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#define UART1_GPIO GPIOA
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/* USART2 */
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#define UART2_GPIO_TX GPIO_Pin_2
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#define UART2_GPIO_TX_SOURCE GPIO_PinSource2
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#define UART2_GPIO_RX GPIO_Pin_3
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#define UART2_GPIO_RX_SOURCE GPIO_PinSource3
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#define UART2_GPIO_AF GPIO_AF_1
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#define UART2_GPIO GPIOA
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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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static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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struct stm32_uart* uart;
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USART_InitTypeDef USART_InitStructure;
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RT_ASSERT(serial != RT_NULL);
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RT_ASSERT(cfg != RT_NULL);
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uart = (struct stm32_uart *)serial->parent.user_data;
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USART_InitStructure.USART_BaudRate = cfg->baud_rate;
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if (cfg->data_bits == DATA_BITS_8)
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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if (cfg->stop_bits == STOP_BITS_1)
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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else if (cfg->stop_bits == STOP_BITS_2)
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USART_InitStructure.USART_StopBits = USART_StopBits_2;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_Init(uart->uart_device, &USART_InitStructure);
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/* Enable USART */
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USART_Cmd(uart->uart_device, ENABLE);
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/* enable interrupt */
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USART_ITConfig(uart->uart_device, USART_IT_RXNE, ENABLE);
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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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RT_ASSERT(serial != RT_NULL);
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uart = (struct stm32_uart *)serial->parent.user_data;
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CLR_INT:
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/* disable rx irq */
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UART_DISABLE_IRQ(uart->irq);
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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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UART_ENABLE_IRQ(uart->irq);
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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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while (!(uart->uart_device->ISR & USART_FLAG_TXE));
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uart->uart_device->TDR = c;
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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 & USART_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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/* enter interrupt */
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rt_interrupt_enter();
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if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
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{
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rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_RX_IND);
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/* clear interrupt */
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USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
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}
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if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
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{
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/* clear interrupt */
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USART_ClearITPendingBit(uart->uart_device, USART_IT_TC);
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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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#if defined(RT_USING_UART2)
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/* UART2 device driver structure */
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struct stm32_uart uart2 =
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{
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USART2,
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USART2_IRQn,
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};
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struct rt_serial_device serial2;
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void USART2_IRQHandler(void)
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{
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struct stm32_uart* uart;
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uart = &uart2;
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/* enter interrupt */
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rt_interrupt_enter();
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if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
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{
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rt_hw_serial_isr(&serial2, RT_SERIAL_EVENT_RX_IND);
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/* clear interrupt */
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USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
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}
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if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
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{
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/* clear interrupt */
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USART_ClearITPendingBit(uart->uart_device, USART_IT_TC);
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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_UART2 */
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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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/* Enable GPIO clock */
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
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/* Enable USART clock */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
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#endif /* RT_USING_UART1 */
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#ifdef RT_USING_UART2
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/* Enable GPIO clock */
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
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/* Enable USART clock */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
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#endif /* RT_USING_UART2 */
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}
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static void GPIO_Configuration(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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#ifdef RT_USING_UART1
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/* Connect PXx to USARTx_Tx */
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GPIO_PinAFConfig(UART1_GPIO, UART1_GPIO_TX_SOURCE, UART1_GPIO_AF);
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/* Connect PXx to USARTx_Rx */
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GPIO_PinAFConfig(UART1_GPIO, UART1_GPIO_RX_SOURCE, UART1_GPIO_AF);
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/* Configure USART Tx, Rx as alternate function push-pull */
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GPIO_InitStructure.GPIO_Pin = UART1_GPIO_TX | UART1_GPIO_RX;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
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#endif /* RT_USING_UART1 */
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#ifdef RT_USING_UART2
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/* Connect PXx to USARTx_Tx */
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GPIO_PinAFConfig(UART2_GPIO, UART2_GPIO_TX_SOURCE, UART2_GPIO_AF);
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/* Connect PXx to USARTx_Rx */
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GPIO_PinAFConfig(UART2_GPIO, UART2_GPIO_RX_SOURCE, UART2_GPIO_AF);
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/* Configure USART Tx, Rx as alternate function push-pull */
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GPIO_InitStructure.GPIO_Pin = UART2_GPIO_TX | UART2_GPIO_RX;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
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#endif /* RT_USING_UART2 */
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}
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static void NVIC_Configuration(struct stm32_uart* uart)
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{
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NVIC_InitTypeDef NVIC_InitStructure;
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/* Enable the USART Interrupt */
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NVIC_InitStructure.NVIC_IRQChannel = uart->irq;
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NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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void 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 | RT_DEVICE_FLAG_INT_RX,
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uart);
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#endif /* RT_USING_UART1 */
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#ifdef RT_USING_UART2
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uart = &uart2;
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config.baud_rate = BAUD_RATE_115200;
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serial2.ops = &stm32_uart_ops;
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serial2.config = config;
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NVIC_Configuration(&uart2);
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/* register UART1 device */
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rt_hw_serial_register(&serial2, "uart2",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
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uart);
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#endif /* RT_USING_UART2 */
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}
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