rt-thread-official/bsp/gd32e230k-start/drivers/drv_usart.c

/*
 * Copyright (c) 2006-2019, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2009-01-05     Bernard      the first version
 * 2018-04-19     misonyo      Porting for gd32f30x
 * 2019-03-31     xuzhuoyi     Porting for gd32e230
 */

#include <rthw.h>
#include <drv_usart.h>
#include <rtthread.h>
#include "gd32e230.h"

#ifdef RT_USING_SERIAL

#define UART_ENABLE_IRQ(n)            NVIC_EnableIRQ((n))
#define UART_DISABLE_IRQ(n)           NVIC_DisableIRQ((n))

#if !defined(RT_USING_USART0) && !defined(RT_USING_USART1)
#error "Please define at least one UARTx"

#endif

#include <rtdevice.h>

/* GD32 uart driver */
// Todo: compress uart info
struct gd32_uart
{
    uint32_t uart_periph;
    IRQn_Type irqn;
    rcu_periph_enum per_clk;
    rcu_periph_enum tx_gpio_clk;
    rcu_periph_enum rx_gpio_clk;
    uint32_t tx_port;
    uint32_t tx_af;
    uint16_t tx_pin;
    uint32_t rx_port;
    uint32_t rx_af;
    uint16_t rx_pin; 

    struct rt_serial_device * serial;
    char *device_name;
};

static void uart_isr(struct rt_serial_device *serial);

#if defined(RT_USING_USART0)
struct rt_serial_device serial0;

void USART0_IRQHandler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();

    uart_isr(&serial0);

    /* leave interrupt */
    rt_interrupt_leave();
}

#endif /* RT_USING_USART0 */

#if defined(RT_USING_USART1)
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 */

static const struct gd32_uart uarts[] = {
    #ifdef RT_USING_USART0
    {
        USART0,                                 // uart peripheral index
        USART0_IRQn,                            // uart iqrn
        RCU_USART0, RCU_GPIOA, RCU_GPIOA,       // periph clock, tx gpio clock, rt gpio clock
        GPIOA, GPIO_AF_1, GPIO_PIN_9,           // tx port, tx pin
        GPIOA, GPIO_AF_1, GPIO_PIN_10,          // rx port, rx pin
        &serial0,
        "uart0",
    },
    #endif
    
    #ifdef RT_USING_USART1
    {
        USART1,                                 // uart peripheral index
        USART1_IRQn,                            // uart iqrn
        RCU_USART1, RCU_GPIOA, RCU_GPIOA,       // periph clock, tx gpio clock, rt gpio clock
        GPIOA, GPIO_AF_1, GPIO_PIN_2,           // tx port, tx pin
        GPIOA, GPIO_AF_1, GPIO_PIN_3,           // rx port, rx pin
        &serial1,
        "uart1",
    },
    #endif
};


/**
* @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 uart: UART handle pointer
* @retval None
*/
void gd32_uart_gpio_init(struct gd32_uart *uart)
{
    /* enable USART clock */
    rcu_periph_clock_enable(uart->tx_gpio_clk);
    rcu_periph_clock_enable(uart->rx_gpio_clk);
    rcu_periph_clock_enable(uart->per_clk);    

    /* connect port to USARTx_Tx */
    gpio_af_set(uart->tx_port, uart->tx_af, uart->tx_pin);
    gpio_mode_set(uart->tx_port, GPIO_MODE_AF, GPIO_PUPD_NONE, uart->tx_pin);
    gpio_output_options_set(uart->tx_port, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, uart->tx_pin);
	
    /* connect port to USARTx_Rx */
    gpio_af_set(uart->rx_port, uart->rx_af, uart->rx_pin);
    gpio_mode_set(uart->rx_port, GPIO_MODE_INPUT, GPIO_PUPD_NONE, uart->rx_pin);
    gpio_output_options_set(uart->rx_port, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, uart->rx_pin);
	
    NVIC_SetPriority(uart->irqn, 0);
    NVIC_EnableIRQ(uart->irqn);
}

static rt_err_t gd32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
    struct gd32_uart *uart;

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

    uart = (struct gd32_uart *)serial->parent.user_data;
    
    gd32_uart_gpio_init(uart);
    
    usart_baudrate_set(uart->uart_periph, cfg->baud_rate);

    switch (cfg->data_bits)
    {
    case DATA_BITS_9:
        usart_word_length_set(uart->uart_periph, USART_WL_9BIT);
        break;

    default:
        usart_word_length_set(uart->uart_periph, USART_WL_8BIT);
        break;
    }

    switch (cfg->stop_bits)
    {
    case STOP_BITS_2:
        usart_stop_bit_set(uart->uart_periph, USART_STB_2BIT);
        break;
    default:
        usart_stop_bit_set(uart->uart_periph, USART_STB_1BIT);
        break;
    }

    switch (cfg->parity)
    {
    case PARITY_ODD:
        usart_parity_config(uart->uart_periph, USART_PM_ODD);
        break;
    case PARITY_EVEN:
        usart_parity_config(uart->uart_periph, USART_PM_EVEN);
        break;
    default:
        usart_parity_config(uart->uart_periph, USART_PM_NONE);
        break;
    }

    usart_receive_config(uart->uart_periph, USART_RECEIVE_ENABLE);
    usart_transmit_config(uart->uart_periph, USART_TRANSMIT_ENABLE);
    usart_enable(uart->uart_periph);

    return RT_EOK;
}

static rt_err_t gd32_control(struct rt_serial_device *serial, int cmd, void *arg)
{
    struct gd32_uart *uart;

    RT_ASSERT(serial != RT_NULL);
    uart = (struct gd32_uart *)serial->parent.user_data;

    switch (cmd)
    {
    case RT_DEVICE_CTRL_CLR_INT:
        /* disable rx irq */
        NVIC_DisableIRQ(uart->irqn);
        /* disable interrupt */
        usart_interrupt_disable(uart->uart_periph, USART_INT_RBNE);

        break;
    case RT_DEVICE_CTRL_SET_INT:
        /* enable rx irq */
        NVIC_EnableIRQ(uart->irqn);
        /* enable interrupt */
        usart_interrupt_enable(uart->uart_periph, USART_INT_RBNE);
        break;
    }

    return RT_EOK;
}

static int gd32_putc(struct rt_serial_device *serial, char ch)
{
    struct gd32_uart *uart;

    RT_ASSERT(serial != RT_NULL);
    uart = (struct gd32_uart *)serial->parent.user_data;

    usart_data_transmit(uart->uart_periph, ch);
    while((usart_flag_get(uart->uart_periph, USART_FLAG_TC) == RESET));
    
    return 1;
}

static int gd32_getc(struct rt_serial_device *serial)
{
    int ch;
    struct gd32_uart *uart;

    RT_ASSERT(serial != RT_NULL);
    uart = (struct gd32_uart *)serial->parent.user_data;

    ch = -1;
    if (usart_flag_get(uart->uart_periph, USART_FLAG_RBNE) != RESET)
        ch = usart_data_receive(uart->uart_periph);
    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 gd32_uart *uart = (struct gd32_uart *) serial->parent.user_data;

    RT_ASSERT(uart != RT_NULL);

    /* UART in mode Receiver */
    if ((usart_interrupt_flag_get(uart->uart_periph, USART_INT_FLAG_RBNE) != RESET) &&
            (usart_flag_get(uart->uart_periph, USART_FLAG_RBNE) != RESET))
    {
        rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
        /* Clear RXNE interrupt flag */
        usart_flag_clear(uart->uart_periph, USART_FLAG_RBNE);
    }
}

static const struct rt_uart_ops gd32_uart_ops =
{
    gd32_configure,
    gd32_control,
    gd32_putc,
    gd32_getc
};

int gd32_hw_usart_init(void)
{
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
    int i;

    for (i = 0; i < sizeof(uarts) / sizeof(uarts[0]); i++)
    {
        uarts[i].serial->ops    = &gd32_uart_ops;
        uarts[i].serial->config = config;

        /* register UART device */
        rt_hw_serial_register(uarts[i].serial,
                              uarts[i].device_name,
                              RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                              (void *)&uarts[i]);
    }

    return 0;
}
INIT_BOARD_EXPORT(gd32_hw_usart_init);
#endif