/*
 * File      : drv_usart.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006-2013, 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
 * 2009-01-05     Bernard      the first version
 * 2010-03-29     Bernard      remove interrupt Tx and DMA Rx mode
 * 2013-05-13     aozima       update for kehong-lingtai.
 * 2015-01-31     armink       make sure the serial transmit complete in putc()
 * 2016-05-13     armink       add DMA Rx mode
 * 2017-01-19     aubr.cool    add interrupt Tx mode
 * 2017-04-13     aubr.cool    correct Rx parity err
 * 2017-10-20     ZYH          porting to HAL Libraries(with out DMA)
 * 2017-11-15     ZYH          update to 3.0.0
 */
#include "board.h"
#include <rtdevice.h>
#include <drv_usart.h>

/* STM32 uart driver */
struct stm32_uart
{
    UART_HandleTypeDef huart;
    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->huart.Init.BaudRate   = cfg->baud_rate;
    uart->huart.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
    uart->huart.Init.Mode       = UART_MODE_TX_RX;
    uart->huart.Init.OverSampling = UART_OVERSAMPLING_16;
    switch (cfg->data_bits)
    {
    case DATA_BITS_8:
        uart->huart.Init.WordLength = UART_WORDLENGTH_8B;
        break;
    case DATA_BITS_9:
        uart->huart.Init.WordLength = UART_WORDLENGTH_9B;
        break;
    default:
        uart->huart.Init.WordLength = UART_WORDLENGTH_8B;
        break;
    }
    switch (cfg->stop_bits)
    {
    case STOP_BITS_1:
        uart->huart.Init.StopBits   = UART_STOPBITS_1;
        break;
    case STOP_BITS_2:
        uart->huart.Init.StopBits   = UART_STOPBITS_2;
        break;
    default:
        uart->huart.Init.StopBits   = UART_STOPBITS_1;
        break;
    }
    switch (cfg->parity)
    {
    case PARITY_NONE:
        uart->huart.Init.Parity     = UART_PARITY_NONE;
        break;
    case PARITY_ODD:
        uart->huart.Init.Parity     = UART_PARITY_ODD;
        break;
    case PARITY_EVEN:
        uart->huart.Init.Parity     = UART_PARITY_EVEN;
        break;
    default:
        uart->huart.Init.Parity     = UART_PARITY_NONE;
        break;
    }
    if (HAL_UART_Init(&uart->huart) != 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)
    {
    /* disable interrupt */
    case RT_DEVICE_CTRL_CLR_INT:
        /* disable rx irq */
        NVIC_DisableIRQ(uart->irq);
        /* disable interrupt */
        __HAL_UART_DISABLE_IT(&uart->huart, USART_IT_RXNE);
        break;
    /* enable interrupt */
    case RT_DEVICE_CTRL_SET_INT:
        /* enable rx irq */
        NVIC_EnableIRQ(uart->irq);
        /* enable interrupt */
        __HAL_UART_ENABLE_IT(&uart->huart, USART_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 (__HAL_UART_GET_FLAG(&uart->huart, UART_FLAG_TXE) == RESET);
    uart->huart.Instance->DR = 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 (__HAL_UART_GET_FLAG(&uart->huart, UART_FLAG_RXNE) != RESET)
    {
        ch = uart->huart.Instance->DR & 0xff;
    }
    return ch;
}

/**
 * Uart common interrupt process. This need add to uart ISR.
 *
 * @param serial serial device
 */
static void uart_isr(struct rt_serial_device *serial)
{
    struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
    RT_ASSERT(uart != RT_NULL);
    if ((__HAL_UART_GET_FLAG(&uart->huart, UART_FLAG_RXNE) != RESET) && (__HAL_UART_GET_IT_SOURCE(&uart->huart, UART_IT_RXNE) != RESET))
    {
        rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
        __HAL_UART_CLEAR_FLAG(&uart->huart, UART_FLAG_RXNE);
    }
}

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 */
struct stm32_uart uart1 =
{
    {USART1},
    USART1_IRQn
};
struct rt_serial_device serial1;

void USART1_IRQHandler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();
    uart_isr(&serial1);
    /* leave interrupt */
    rt_interrupt_leave();
}
#endif /* RT_USING_UART1 */

#if defined(RT_USING_UART2)
/* UART1 device driver structure */
struct stm32_uart uart2 =
{
    {USART2},
    USART2_IRQn
};
struct rt_serial_device serial2;

void USART2_IRQHandler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();

    uart_isr(&serial2);

    /* leave interrupt */
    rt_interrupt_leave();
}
#endif /* RT_USING_UART2 */

#if defined(RT_USING_UART3)
/* UART1 device driver structure */
struct stm32_uart uart3 =
{
    {USART3},
    USART3_IRQn
};
struct rt_serial_device serial3;

void USART3_IRQHandler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();

    uart_isr(&serial3);

    /* leave interrupt */
    rt_interrupt_leave();
}
#endif /* RT_USING_UART2 */

static void MX_USART_UART_Init(UART_HandleTypeDef *uartHandle);

int rt_hw_usart_init(void)
{
    struct stm32_uart *uart;
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#if defined(RT_USING_UART1)
    uart = &uart1;
    config.baud_rate = BAUD_RATE_115200;
    serial1.ops    = &stm32_uart_ops;
    serial1.config = config;
    MX_USART_UART_Init(&uart->huart);
    /* register UART1 device */
    rt_hw_serial_register(&serial1, "uart1",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart);
#endif /* RT_USING_UART1 */

#if defined(RT_USING_UART2)
    uart = &uart2;
    config.baud_rate = BAUD_RATE_115200;
    serial2.ops    = &stm32_uart_ops;
    serial2.config = config;
    MX_USART_UART_Init(&uart->huart);
    /* register UART1 device */
    rt_hw_serial_register(&serial2, "uart2",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart);
#endif /* RT_USING_UART1 */

#if defined(RT_USING_UART3)
    uart = &uart3;
    config.baud_rate = BAUD_RATE_115200;
    serial3.ops    = &stm32_uart_ops;
    serial3.config = config;
    MX_USART_UART_Init(&uart->huart);
    /* register UART1 device */
    rt_hw_serial_register(&serial3, "uart3",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart);
#endif /* RT_USING_UART1 */
    return 0;
}
INIT_BOARD_EXPORT(rt_hw_usart_init);

static void MX_USART_UART_Init(UART_HandleTypeDef *uartHandle)
{
    rt_err_t result;
    uartHandle->Init.BaudRate = 115200;
    uartHandle->Init.WordLength = UART_WORDLENGTH_8B;
    uartHandle->Init.StopBits = UART_STOPBITS_1;
    uartHandle->Init.Parity = UART_PARITY_NONE;
    uartHandle->Init.Mode = UART_MODE_TX_RX;
    uartHandle->Init.HwFlowCtl = UART_HWCONTROL_NONE;
    uartHandle->Init.OverSampling = UART_OVERSAMPLING_16;
    result = HAL_UART_Init(uartHandle);
    RT_ASSERT(result == HAL_OK);

}
/* USART2 init function */

void HAL_UART_MspInit(UART_HandleTypeDef *uartHandle)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    if (uartHandle->Instance == USART1)
    {
        /* USER CODE BEGIN USART1_MspInit 0 */
        /* USER CODE END USART1_MspInit 0 */
        /* USART1 clock enable */
        __HAL_RCC_USART1_CLK_ENABLE();
        __HAL_RCC_GPIOA_CLK_ENABLE();
        /**USART1 GPIO Configuration
        PA9     ------> USART1_TX
        PA10     ------> USART1_RX
        */
        GPIO_InitStruct.Pin = GPIO_PIN_9;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
        GPIO_InitStruct.Pin = GPIO_PIN_10;
        GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
        GPIO_InitStruct.Pull = GPIO_NOPULL;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
        /* USART1 interrupt Init */
        HAL_NVIC_SetPriority(USART1_IRQn, 5, 0);
        HAL_NVIC_EnableIRQ(USART1_IRQn);
        /* USER CODE BEGIN USART1_MspInit 1 */
        /* USER CODE END USART1_MspInit 1 */
    }
    else if (uartHandle->Instance == USART2)
    {
        /* USER CODE BEGIN USART2_MspInit 0 */
        /* USER CODE END USART2_MspInit 0 */
        /* USART2 clock enable */
        __HAL_RCC_USART2_CLK_ENABLE();
        __HAL_RCC_GPIOA_CLK_ENABLE();
        /**USART2 GPIO Configuration
        PA2     ------> USART2_TX
        PA3     ------> USART2_RX
        */
        GPIO_InitStruct.Pin = GPIO_PIN_2;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
        GPIO_InitStruct.Pin = GPIO_PIN_3;
        GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
        GPIO_InitStruct.Pull = GPIO_NOPULL;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
        /* USART2 interrupt Init */
        HAL_NVIC_SetPriority(USART2_IRQn, 5, 0);
        HAL_NVIC_EnableIRQ(USART2_IRQn);
        /* USER CODE BEGIN USART2_MspInit 1 */

        /* USER CODE END USART2_MspInit 1 */
    }
    else if (uartHandle->Instance == USART3)
    {
        /* USER CODE BEGIN USART3_MspInit 0 */
        /* USER CODE END USART3_MspInit 0 */
        /* USART3 clock enable */
        __HAL_RCC_USART3_CLK_ENABLE();
        __HAL_RCC_GPIOB_CLK_ENABLE();
        /**USART3 GPIO Configuration
        PB10     ------> USART3_TX
        PB11     ------> USART3_RX
        */
        GPIO_InitStruct.Pin = GPIO_PIN_10;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
        GPIO_InitStruct.Pin = GPIO_PIN_11;
        GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
        GPIO_InitStruct.Pull = GPIO_NOPULL;
        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
        /* USART3 interrupt Init */
        HAL_NVIC_SetPriority(USART3_IRQn, 5, 0);
        HAL_NVIC_EnableIRQ(USART3_IRQn);
        /* USER CODE BEGIN USART3_MspInit 1 */
        /* USER CODE END USART3_MspInit 1 */
    }
}

void HAL_UART_MspDeInit(UART_HandleTypeDef *uartHandle)
{
    if (uartHandle->Instance == USART1)
    {
        /* USER CODE BEGIN USART1_MspDeInit 0 */
        /* USER CODE END USART1_MspDeInit 0 */
        /* Peripheral clock disable */
        __HAL_RCC_USART1_CLK_DISABLE();
        /**USART1 GPIO Configuration
        PA9     ------> USART1_TX
        PA10     ------> USART1_RX
        */
        HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9 | GPIO_PIN_10);
        /* USART1 interrupt Deinit */
        HAL_NVIC_DisableIRQ(USART1_IRQn);
        /* USER CODE BEGIN USART1_MspDeInit 1 */
        /* USER CODE END USART1_MspDeInit 1 */
    }
    else if (uartHandle->Instance == USART2)
    {
        /* USER CODE BEGIN USART2_MspDeInit 0 */
        /* USER CODE END USART2_MspDeInit 0 */
        /* Peripheral clock disable */
        __HAL_RCC_USART2_CLK_DISABLE();
        /**USART2 GPIO Configuration
        PA2     ------> USART2_TX
        PA3     ------> USART2_RX
        */
        HAL_GPIO_DeInit(GPIOA, GPIO_PIN_2 | GPIO_PIN_3);
        /* USART2 interrupt Deinit */
        HAL_NVIC_DisableIRQ(USART2_IRQn);
        /* USER CODE BEGIN USART2_MspDeInit 1 */
        /* USER CODE END USART2_MspDeInit 1 */
    }
    else if (uartHandle->Instance == USART3)
    {
        /* USER CODE BEGIN USART3_MspDeInit 0 */
        /* USER CODE END USART3_MspDeInit 0 */
        /* Peripheral clock disable */
        __HAL_RCC_USART3_CLK_DISABLE();
        /**USART3 GPIO Configuration
        PB10     ------> USART3_TX
        PB11     ------> USART3_RX
        */
        HAL_GPIO_DeInit(GPIOB, GPIO_PIN_10 | GPIO_PIN_11);
        /* USART3 interrupt Deinit */
        HAL_NVIC_DisableIRQ(USART3_IRQn);
        /* USER CODE BEGIN USART3_MspDeInit 1 */
        /* USER CODE END USART3_MspDeInit 1 */
    }
}