303 lines
8.9 KiB
C
303 lines
8.9 KiB
C
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/*
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* File : drv_usart.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2015, RT-Thread Development Team
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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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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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* 2015-08-01 xiaonong the first version for stm32f7xx
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* 2016-01-15 ArdaFu the first version for stm32f4xx with STM32 HAL
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*/
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#include "drv_usart.h"
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#include "board.h"
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#include <rtdevice.h>
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#include <rthw.h>
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#include <rtthread.h>
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/* Exported types ------------------------------------------------------------*/
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/* Exported constants --------------------------------------------------------*/
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/* User can use this section to tailor USARTx/UARTx instance used and associated
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resources */
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/* Definition for USARTx clock resources */
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#define USARTx USART2
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#define USARTx_CLK_ENABLE() __HAL_RCC_USART2_CLK_ENABLE();
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#define USARTx_RX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
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#define USARTx_TX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
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#define USARTx_FORCE_RESET() __HAL_RCC_USART2_FORCE_RESET()
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#define USARTx_RELEASE_RESET() __HAL_RCC_USART2_RELEASE_RESET()
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/* Definition for USARTx Pins */
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#define USARTx_TX_PIN GPIO_PIN_2
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#define USARTx_TX_GPIO_PORT GPIOA
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#define USARTx_TX_AF GPIO_AF7_USART2
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#define USARTx_RX_PIN GPIO_PIN_3
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#define USARTx_RX_GPIO_PORT GPIOA
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#define USARTx_RX_AF GPIO_AF7_USART2
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/* STM32 uart driver */
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struct drv_uart
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{
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UART_HandleTypeDef UartHandle;
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IRQn_Type irq;
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};
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static rt_err_t drv_configure(struct rt_serial_device *serial,
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struct serial_configure *cfg)
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{
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struct drv_uart *uart;
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RT_ASSERT(serial != RT_NULL);
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RT_ASSERT(cfg != RT_NULL);
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uart = (struct drv_uart *)serial->parent.user_data;
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uart->UartHandle.Init.BaudRate = cfg->baud_rate;
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uart->UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
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uart->UartHandle.Init.Mode = UART_MODE_TX_RX;
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uart->UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
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switch (cfg->data_bits)
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{
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case DATA_BITS_8:
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uart->UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
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break;
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case DATA_BITS_9:
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uart->UartHandle.Init.WordLength = UART_WORDLENGTH_9B;
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break;
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default:
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uart->UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
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break;
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}
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switch (cfg->stop_bits)
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{
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case STOP_BITS_1:
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uart->UartHandle.Init.StopBits = UART_STOPBITS_1;
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break;
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case STOP_BITS_2:
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uart->UartHandle.Init.StopBits = UART_STOPBITS_2;
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break;
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default:
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uart->UartHandle.Init.StopBits = UART_STOPBITS_1;
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break;
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}
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switch (cfg->parity)
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{
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case PARITY_NONE:
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uart->UartHandle.Init.Parity = UART_PARITY_NONE;
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break;
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case PARITY_ODD:
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uart->UartHandle.Init.Parity = UART_PARITY_ODD;
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break;
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case PARITY_EVEN:
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uart->UartHandle.Init.Parity = UART_PARITY_EVEN;
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break;
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default:
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uart->UartHandle.Init.Parity = UART_PARITY_NONE;
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break;
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}
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if (HAL_UART_Init(&uart->UartHandle) != HAL_OK)
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{
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return RT_ERROR;
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}
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return RT_EOK;
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}
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static rt_err_t drv_control(struct rt_serial_device *serial,
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int cmd, void *arg)
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{
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struct drv_uart *uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct drv_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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NVIC_DisableIRQ(uart->irq);
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/* disable interrupt */
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__HAL_UART_DISABLE_IT(&uart->UartHandle, 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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NVIC_EnableIRQ(uart->irq);
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/* enable interrupt */
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__HAL_UART_ENABLE_IT(&uart->UartHandle, 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 drv_putc(struct rt_serial_device *serial, char c)
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{
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struct drv_uart *uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct drv_uart *)serial->parent.user_data;
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while((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
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uart->UartHandle.Instance->DR = c;
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return 1;
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}
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static int drv_getc(struct rt_serial_device *serial)
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{
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int ch;
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struct drv_uart *uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct drv_uart *)serial->parent.user_data;
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ch = -1;
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if (__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_RXNE) != RESET)
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ch = uart->UartHandle.Instance->DR & 0xff;
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return ch;
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}
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static const struct rt_uart_ops drv_uart_ops =
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{
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drv_configure,
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drv_control,
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drv_putc,
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drv_getc,
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};
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#if defined(RT_USING_UART2)
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/* UART1 device driver structure */
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static struct drv_uart uart2;
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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 drv_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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/* UART in mode Receiver -------------------------------------------------*/
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if ((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_RXNE) != RESET) &&
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(__HAL_UART_GET_IT_SOURCE(&uart->UartHandle, UART_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 RXNE interrupt flag */
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__HAL_UART_CLEAR_FLAG(&uart->UartHandle, UART_FLAG_RXNE);
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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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/**
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* @brief UART MSP Initialization
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* This function configures the hardware resources used in this example:
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* - Peripheral's clock enable
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* - Peripheral's GPIO Configuration
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* - NVIC configuration for UART interrupt request enable
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* @param huart: UART handle pointer
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* @retval None
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*/
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void HAL_UART_MspInit(UART_HandleTypeDef *huart)
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{
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GPIO_InitTypeDef GPIO_InitStruct;
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if (huart->Instance == USART2)
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{
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/*##-1- Enable peripherals and GPIO Clocks #################################*/
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/* Enable GPIO TX/RX clock */
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USARTx_TX_GPIO_CLK_ENABLE();
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USARTx_RX_GPIO_CLK_ENABLE();
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/* Enable USARTx clock */
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USARTx_CLK_ENABLE();
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/*##-2- Configure peripheral GPIO ##########################################*/
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/* UART TX GPIO pin configuration */
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GPIO_InitStruct.Pin = USARTx_TX_PIN;
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GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStruct.Pull = GPIO_PULLUP;
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GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
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GPIO_InitStruct.Alternate = USARTx_TX_AF;
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HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);
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/* UART RX GPIO pin configuration */
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GPIO_InitStruct.Pin = USARTx_RX_PIN;
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GPIO_InitStruct.Alternate = USARTx_RX_AF;
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HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct);
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HAL_NVIC_SetPriority(USART2_IRQn, 0, 1);
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HAL_NVIC_EnableIRQ(USART2_IRQn);
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}
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}
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/**
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* @brief UART MSP De-Initialization
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* This function frees the hardware resources used in this example:
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* - Disable the Peripheral's clock
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* - Revert GPIO and NVIC configuration to their default state
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* @param huart: UART handle pointer
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* @retval None
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*/
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void HAL_UART_MspDeInit(UART_HandleTypeDef *huart)
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{
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if (huart->Instance == USART2)
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{
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/*##-1- Reset peripherals ##################################################*/
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USARTx_FORCE_RESET();
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USARTx_RELEASE_RESET();
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/*##-2- Disable peripherals and GPIO Clocks #################################*/
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/* Configure UART Tx as alternate function */
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HAL_GPIO_DeInit(USARTx_TX_GPIO_PORT, USARTx_TX_PIN);
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/* Configure UART Rx as alternate function */
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HAL_GPIO_DeInit(USARTx_RX_GPIO_PORT, USARTx_RX_PIN);
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HAL_NVIC_DisableIRQ(USART2_IRQn);
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}
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}
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int hw_usart_init(void)
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{
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struct drv_uart *uart;
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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#ifdef RT_USING_UART2
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uart = &uart2;
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uart->UartHandle.Instance = USART2;
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serial2.ops = &drv_uart_ops;
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serial2.config = config;
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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_UART1 */
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return 0;
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}
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INIT_BOARD_EXPORT(hw_usart_init);
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