388 lines
10 KiB
C
388 lines
10 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) 2009, 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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* 2009-01-05 Bernard the first version
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* 2010-03-29 Bernard remove interrupt Tx and DMA Rx mode
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* 2012-02-08 aozima update for F4.
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* 2012-07-28 aozima update for ART board.
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*/
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#include "stm32f4xx.h"
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#include "usart.h"
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#include "board.h"
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#include <rtdevice.h>
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/* UART GPIO define. */
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#define UART1_GPIO_TX GPIO_Pin_6
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#define UART1_TX_PIN_SOURCE GPIO_PinSource6
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#define UART1_GPIO_RX GPIO_Pin_7
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#define UART1_RX_PIN_SOURCE GPIO_PinSource7
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#define UART1_GPIO GPIOB
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#define UART1_GPIO_RCC RCC_AHB1Periph_GPIOB
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#define RCC_APBPeriph_UART1 RCC_APB2Periph_USART1
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#define UART1_TX_DMA DMA1_Channel4
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#define UART1_RX_DMA DMA1_Channel5
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#define UART2_GPIO_TX GPIO_Pin_2
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#define UART2_TX_PIN_SOURCE GPIO_PinSource2
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#define UART2_GPIO_RX GPIO_Pin_3
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#define UART2_RX_PIN_SOURCE GPIO_PinSource3
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#define UART2_GPIO GPIOA
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#define UART2_GPIO_RCC RCC_AHB1Periph_GPIOA
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#define RCC_APBPeriph_UART2 RCC_APB1Periph_USART2
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#define UART2_TX_DMA DMA1_Channel4
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#define UART2_RX_DMA DMA1_Channel5
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#define UART3_GPIO_TX GPIO_Pin_8
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#define UART3_TX_PIN_SOURCE GPIO_PinSource8
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#define UART3_GPIO_RX GPIO_Pin_9
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#define UART3_RX_PIN_SOURCE GPIO_PinSource9
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#define UART3_GPIO GPIOD
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#define UART3_GPIO_RCC RCC_AHB1Periph_GPIOD
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#define RCC_APBPeriph_UART3 RCC_APB1Periph_USART3
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#define UART3_TX_DMA DMA1_Stream1
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#define UART3_RX_DMA DMA1_Stream3
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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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if (cfg->baud_rate == BAUD_RATE_9600)
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USART_InitStructure.USART_BaudRate = 9600;
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else if (cfg->baud_rate == BAUD_RATE_115200)
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USART_InitStructure.USART_BaudRate = 115200;
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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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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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/* disable interrupt */
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USART_ITConfig(uart->uart_device, USART_IT_RXNE, DISABLE);
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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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/* enable interrupt */
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USART_ITConfig(uart->uart_device, USART_IT_RXNE, ENABLE);
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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->SR & USART_FLAG_TXE));
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uart->uart_device->DR = 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->SR & USART_FLAG_RXNE)
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{
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ch = uart->uart_device->DR & 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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}
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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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}
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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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#if defined(RT_USING_UART3)
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/* UART3 device driver structure */
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struct stm32_uart uart3 =
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{
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USART3,
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USART3_IRQn,
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};
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struct rt_serial_device serial3;
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void USART3_IRQHandler(void)
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{
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struct stm32_uart *uart;
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uart = &uart3;
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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(&serial3, RT_SERIAL_EVENT_RX_IND);
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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_UART3 */
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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 UART1 GPIO clocks */
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RCC_AHB1PeriphClockCmd(UART1_GPIO_RCC, ENABLE);
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/* Enable UART1 clock */
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RCC_APB2PeriphClockCmd(RCC_APBPeriph_UART1, ENABLE);
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#endif /* RT_USING_UART1 */
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#ifdef RT_USING_UART2
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/* Enable UART2 GPIO clocks */
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RCC_AHB1PeriphClockCmd(UART2_GPIO_RCC, ENABLE);
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/* Enable UART2 clock */
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RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART2, ENABLE);
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#endif /* RT_USING_UART1 */
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#ifdef RT_USING_UART3
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/* Enable UART3 GPIO clocks */
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RCC_AHB1PeriphClockCmd(UART3_GPIO_RCC, ENABLE);
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/* Enable UART3 clock */
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RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART3, ENABLE);
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#endif /* RT_USING_UART3 */
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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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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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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_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
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#ifdef RT_USING_UART1
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/* Configure USART1 Rx/tx PIN */
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GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX | UART1_GPIO_TX;
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GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
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/* Connect alternate function */
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GPIO_PinAFConfig(UART1_GPIO, UART1_TX_PIN_SOURCE, GPIO_AF_USART1);
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GPIO_PinAFConfig(UART1_GPIO, UART1_RX_PIN_SOURCE, GPIO_AF_USART1);
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#endif /* RT_USING_UART1 */
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#ifdef RT_USING_UART2
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/* Configure USART2 Rx/tx PIN */
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GPIO_InitStructure.GPIO_Pin = UART2_GPIO_RX | UART2_GPIO_TX;
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GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
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/* Connect alternate function */
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GPIO_PinAFConfig(UART2_GPIO, UART2_TX_PIN_SOURCE, GPIO_AF_USART2);
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GPIO_PinAFConfig(UART2_GPIO, UART2_RX_PIN_SOURCE, GPIO_AF_USART2);
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#endif /* RT_USING_UART2 */
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#ifdef RT_USING_UART3
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/* Configure USART3 Rx/tx PIN */
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GPIO_InitStructure.GPIO_Pin = UART3_GPIO_TX | UART3_GPIO_RX;
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GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
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/* Connect alternate function */
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GPIO_PinAFConfig(UART3_GPIO, UART3_TX_PIN_SOURCE, GPIO_AF_USART3);
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GPIO_PinAFConfig(UART3_GPIO, UART3_RX_PIN_SOURCE, GPIO_AF_USART3);
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#endif /* RT_USING_UART3 */
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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 USART1 Interrupt */
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NVIC_InitStructure.NVIC_IRQChannel = uart->irq;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 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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int stm32_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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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,
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"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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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,
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"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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#ifdef RT_USING_UART3
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uart = &uart3;
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serial3.ops = &stm32_uart_ops;
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serial3.config = config;
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NVIC_Configuration(&uart3);
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/* register UART3 device */
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rt_hw_serial_register(&serial3,
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"uart3",
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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_UART3 */
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return 0;
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}
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INIT_BOARD_EXPORT(stm32_hw_usart_init);
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