/* * File : drv_usart.c * This file is part of RT-Thread RTOS * COPYRIGHT (C) 2015, RT-Thread Development Team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * Change Logs: * Date Author Notes * 2009-01-05 Bernard the first version * 2015-08-01 xiaonong the first version for stm32f7xx * 2016-01-15 ArdaFu the first version for stm32f4xx with STM32 HAL */ #include "drv_usart.h" #include "board.h" #include <rtdevice.h> #include <rthw.h> #include <rtthread.h> /* Exported types ------------------------------------------------------------*/ /* Exported constants --------------------------------------------------------*/ /* User can use this section to tailor USARTx/UARTx instance used and associated resources */ /* Definition for USARTx clock resources */ #define USARTx USART2 #define USARTx_CLK_ENABLE() __HAL_RCC_USART2_CLK_ENABLE(); #define USARTx_RX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE() #define USARTx_TX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE() #define USARTx_FORCE_RESET() __HAL_RCC_USART2_FORCE_RESET() #define USARTx_RELEASE_RESET() __HAL_RCC_USART2_RELEASE_RESET() /* Definition for USARTx Pins */ #define USARTx_TX_PIN GPIO_PIN_2 #define USARTx_TX_GPIO_PORT GPIOA #define USARTx_TX_AF GPIO_AF7_USART2 #define USARTx_RX_PIN GPIO_PIN_3 #define USARTx_RX_GPIO_PORT GPIOA #define USARTx_RX_AF GPIO_AF7_USART2 /* STM32 uart driver */ struct drv_uart { UART_HandleTypeDef UartHandle; IRQn_Type irq; }; static rt_err_t drv_configure(struct rt_serial_device *serial, struct serial_configure *cfg) { struct drv_uart *uart; RT_ASSERT(serial != RT_NULL); RT_ASSERT(cfg != RT_NULL); uart = (struct drv_uart *)serial->parent.user_data; uart->UartHandle.Init.BaudRate = cfg->baud_rate; uart->UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE; uart->UartHandle.Init.Mode = UART_MODE_TX_RX; uart->UartHandle.Init.OverSampling = UART_OVERSAMPLING_16; switch (cfg->data_bits) { case DATA_BITS_8: uart->UartHandle.Init.WordLength = UART_WORDLENGTH_8B; break; case DATA_BITS_9: uart->UartHandle.Init.WordLength = UART_WORDLENGTH_9B; break; default: uart->UartHandle.Init.WordLength = UART_WORDLENGTH_8B; break; } switch (cfg->stop_bits) { case STOP_BITS_1: uart->UartHandle.Init.StopBits = UART_STOPBITS_1; break; case STOP_BITS_2: uart->UartHandle.Init.StopBits = UART_STOPBITS_2; break; default: uart->UartHandle.Init.StopBits = UART_STOPBITS_1; break; } switch (cfg->parity) { case PARITY_NONE: uart->UartHandle.Init.Parity = UART_PARITY_NONE; break; case PARITY_ODD: uart->UartHandle.Init.Parity = UART_PARITY_ODD; break; case PARITY_EVEN: uart->UartHandle.Init.Parity = UART_PARITY_EVEN; break; default: uart->UartHandle.Init.Parity = UART_PARITY_NONE; break; } if (HAL_UART_Init(&uart->UartHandle) != HAL_OK) { return RT_ERROR; } return RT_EOK; } static rt_err_t drv_control(struct rt_serial_device *serial, int cmd, void *arg) { struct drv_uart *uart; RT_ASSERT(serial != RT_NULL); uart = (struct drv_uart *)serial->parent.user_data; switch (cmd) { case RT_DEVICE_CTRL_CLR_INT: /* disable rx irq */ NVIC_DisableIRQ(uart->irq); /* disable interrupt */ __HAL_UART_DISABLE_IT(&uart->UartHandle, UART_IT_RXNE); break; case RT_DEVICE_CTRL_SET_INT: /* enable rx irq */ NVIC_EnableIRQ(uart->irq); /* enable interrupt */ __HAL_UART_ENABLE_IT(&uart->UartHandle, UART_IT_RXNE); break; } return RT_EOK; } static int drv_putc(struct rt_serial_device *serial, char c) { struct drv_uart *uart; RT_ASSERT(serial != RT_NULL); uart = (struct drv_uart *)serial->parent.user_data; while((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET)); uart->UartHandle.Instance->DR = c; return 1; } static int drv_getc(struct rt_serial_device *serial) { int ch; struct drv_uart *uart; RT_ASSERT(serial != RT_NULL); uart = (struct drv_uart *)serial->parent.user_data; ch = -1; if (__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_RXNE) != RESET) ch = uart->UartHandle.Instance->DR & 0xff; return ch; } static const struct rt_uart_ops drv_uart_ops = { drv_configure, drv_control, drv_putc, drv_getc, }; #if defined(RT_USING_UART2) /* UART1 device driver structure */ static struct drv_uart uart2; struct rt_serial_device serial2; void USART2_IRQHandler(void) { struct drv_uart *uart; uart = &uart2; /* enter interrupt */ rt_interrupt_enter(); /* UART in mode Receiver -------------------------------------------------*/ if ((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_RXNE) != RESET) && (__HAL_UART_GET_IT_SOURCE(&uart->UartHandle, UART_IT_RXNE) != RESET)) { rt_hw_serial_isr(&serial2, RT_SERIAL_EVENT_RX_IND); /* Clear RXNE interrupt flag */ __HAL_UART_CLEAR_FLAG(&uart->UartHandle, UART_FLAG_RXNE); } /* leave interrupt */ rt_interrupt_leave(); } #endif /* RT_USING_UART1 */ /** * @brief UART MSP Initialization * This function configures the hardware resources used in this example: * - Peripheral's clock enable * - Peripheral's GPIO Configuration * - NVIC configuration for UART interrupt request enable * @param huart: UART handle pointer * @retval None */ void HAL_UART_MspInit(UART_HandleTypeDef *huart) { GPIO_InitTypeDef GPIO_InitStruct; if (huart->Instance == USART2) { /*##-1- Enable peripherals and GPIO Clocks #################################*/ /* Enable GPIO TX/RX clock */ USARTx_TX_GPIO_CLK_ENABLE(); USARTx_RX_GPIO_CLK_ENABLE(); /* Enable USARTx clock */ USARTx_CLK_ENABLE(); /*##-2- Configure peripheral GPIO ##########################################*/ /* UART TX GPIO pin configuration */ GPIO_InitStruct.Pin = USARTx_TX_PIN; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FAST; GPIO_InitStruct.Alternate = USARTx_TX_AF; HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct); /* UART RX GPIO pin configuration */ GPIO_InitStruct.Pin = USARTx_RX_PIN; GPIO_InitStruct.Alternate = USARTx_RX_AF; HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct); HAL_NVIC_SetPriority(USART2_IRQn, 0, 1); HAL_NVIC_EnableIRQ(USART2_IRQn); } } /** * @brief UART MSP De-Initialization * This function frees the hardware resources used in this example: * - Disable the Peripheral's clock * - Revert GPIO and NVIC configuration to their default state * @param huart: UART handle pointer * @retval None */ void HAL_UART_MspDeInit(UART_HandleTypeDef *huart) { if (huart->Instance == USART2) { /*##-1- Reset peripherals ##################################################*/ USARTx_FORCE_RESET(); USARTx_RELEASE_RESET(); /*##-2- Disable peripherals and GPIO Clocks #################################*/ /* Configure UART Tx as alternate function */ HAL_GPIO_DeInit(USARTx_TX_GPIO_PORT, USARTx_TX_PIN); /* Configure UART Rx as alternate function */ HAL_GPIO_DeInit(USARTx_RX_GPIO_PORT, USARTx_RX_PIN); HAL_NVIC_DisableIRQ(USART2_IRQn); } } int hw_usart_init(void) { struct drv_uart *uart; struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT; #ifdef RT_USING_UART2 uart = &uart2; uart->UartHandle.Instance = USART2; serial2.ops = &drv_uart_ops; serial2.config = config; /* register UART1 device */ rt_hw_serial_register(&serial2, "uart2", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX, uart); #endif /* RT_USING_UART1 */ return 0; } INIT_BOARD_EXPORT(hw_usart_init);