rt-thread/bsp/stm32f7-disco/drivers/drv_usart.c

/*
 * File      : usart.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2009, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2015-08-01     xiaonong     the first version for stm32f7xx
 */

#include "stm32f7xx.h"
#include "drv_usart.h"
#include "board.h"

#include <rtdevice.h>

/* Definition for USART1 clock resources */
#define USART1_CLK_ENABLE()              __USART1_CLK_ENABLE()
#define USART1_RX_GPIO_CLK_ENABLE()      __GPIOB_CLK_ENABLE()
#define USART1_TX_GPIO_CLK_ENABLE()      __GPIOA_CLK_ENABLE()

#define USART1_FORCE_RESET()             __USART1_FORCE_RESET()
#define USART1_RELEASE_RESET()           __USART1_RELEASE_RESET()

/* Definition for USARTx Pins */
#define USART1_TX_PIN                    GPIO_PIN_9
#define USART1_TX_GPIO_PORT              GPIOA
#define USART1_TX_AF                     GPIO_AF7_USART1
#define USART1_RX_PIN                    GPIO_PIN_7
#define USART1_RX_GPIO_PORT              GPIOB
#define USART1_RX_AF                     GPIO_AF7_USART1



/* STM32 uart driver */
struct stm32_uart
{
    UART_HandleTypeDef UartHandle;
    IRQn_Type irq;
};

static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
    struct stm32_uart *uart;

    RT_ASSERT(serial != RT_NULL);
    RT_ASSERT(cfg != RT_NULL);

    uart = (struct stm32_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.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;

    switch (cfg->data_bits)
    {
    case DATA_BITS_7:
        uart->UartHandle.Init.WordLength = UART_WORDLENGTH_7B;
        break;
    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_DeInit(&uart->UartHandle) != HAL_OK)
    {
        return RT_ERROR;
    }
    if (HAL_UART_Init(&uart->UartHandle) != HAL_OK)
    {
        return RT_ERROR;
    }

    return RT_EOK;
}

static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *arg)
{
    struct stm32_uart *uart;

    RT_ASSERT(serial != RT_NULL);
    uart = (struct stm32_uart *)serial->parent.user_data;

    switch (cmd)
    {
    case RT_DEVICE_CTRL_CLR_INT:
        /* disable rx irq */
        UART_DISABLE_IRQ(uart->irq);
        /* disable interrupt */
        __HAL_UART_DISABLE_IT(&uart->UartHandle, UART_IT_RXNE);
        break;
    case RT_DEVICE_CTRL_SET_INT:
        /* enable rx irq */
        UART_ENABLE_IRQ(uart->irq);
        /* enable interrupt */
        __HAL_UART_ENABLE_IT(&uart->UartHandle, UART_IT_RXNE);
        break;
    }

    return RT_EOK;
}

static int stm32_putc(struct rt_serial_device *serial, char c)
{
    struct stm32_uart *uart;

    RT_ASSERT(serial != RT_NULL);
    uart = (struct stm32_uart *)serial->parent.user_data;

    while (!(uart->UartHandle.Instance->ISR & UART_FLAG_TXE));
    uart->UartHandle.Instance->TDR = c;

    return 1;
}

static int stm32_getc(struct rt_serial_device *serial)
{
    int ch;
    struct stm32_uart *uart;

    RT_ASSERT(serial != RT_NULL);
    uart = (struct stm32_uart *)serial->parent.user_data;

    ch = -1;
    if (uart->UartHandle.Instance->ISR & UART_FLAG_RXNE)
    {
        ch = uart->UartHandle.Instance->RDR & 0xff;
    }

    return ch;
}

static const struct rt_uart_ops stm32_uart_ops =
{
    stm32_configure,
    stm32_control,
    stm32_putc,
    stm32_getc,
};

#if defined(RT_USING_UART1)
/* UART1 device driver structure */

static struct stm32_uart uart1;
struct rt_serial_device serial1;

void USART1_IRQHandler(void)
{
    struct stm32_uart *uart;

    uart = &uart1;

    /* enter interrupt */
    rt_interrupt_enter();

    /* UART in mode Receiver ---------------------------------------------------*/
    if ((__HAL_UART_GET_IT(&uart->UartHandle, UART_IT_RXNE) != RESET) && (__HAL_UART_GET_IT_SOURCE(&uart->UartHandle, UART_IT_RXNE) != RESET))
    {
        rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_RX_IND);
        /* Clear RXNE interrupt flag */
        __HAL_UART_SEND_REQ(&uart->UartHandle, UART_RXDATA_FLUSH_REQUEST);
    }
    /* 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 == USART1)
    {
        /* Enable GPIO TX/RX clock */
        USART1_TX_GPIO_CLK_ENABLE();
        USART1_RX_GPIO_CLK_ENABLE();
        /* Enable USARTx clock */
        USART1_CLK_ENABLE();

        /* UART TX GPIO pin configuration  */
        GPIO_InitStruct.Pin       = USART1_TX_PIN;
        GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull      = GPIO_PULLUP;
        GPIO_InitStruct.Speed     = GPIO_SPEED_HIGH;
        GPIO_InitStruct.Alternate = USART1_TX_AF;
        HAL_GPIO_Init(USART1_TX_GPIO_PORT, &GPIO_InitStruct);

        /* UART RX GPIO pin configuration  */
        GPIO_InitStruct.Pin = USART1_RX_PIN;
        GPIO_InitStruct.Alternate = USART1_RX_AF;
        HAL_GPIO_Init(USART1_RX_GPIO_PORT, &GPIO_InitStruct);

        /* NVIC for USART */
        HAL_NVIC_SetPriority(USART1_IRQn, 0, 1);
        HAL_NVIC_EnableIRQ(USART1_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 == USART1)
    {
        /* Reset peripherals */
        USART1_FORCE_RESET();
        USART1_RELEASE_RESET();

        /* Disable peripherals and GPIO Clocks */
        /* Configure UART Tx as alternate function  */
        HAL_GPIO_DeInit(USART1_TX_GPIO_PORT, USART1_TX_PIN);
        /* Configure UART Rx as alternate function  */
        HAL_GPIO_DeInit(USART1_RX_GPIO_PORT, USART1_RX_PIN);

        /* Disable the NVIC for UART */
        HAL_NVIC_DisableIRQ(USART1_IRQn);
    }
}

int stm32_hw_usart_init(void)
{
    struct stm32_uart *uart;
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

#ifdef RT_USING_UART1
    uart = &uart1;
    uart->UartHandle.Instance = USART1;

    serial1.ops    = &stm32_uart_ops;
    serial1.config = config;

    /* register UART1 device */
    rt_hw_serial_register(&serial1,
                          "uart1",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart);
#endif /* RT_USING_UART1 */


    return 0;
}
INIT_BOARD_EXPORT(stm32_hw_usart_init);