rt-thread-official/bsp/stm32/stm32mp157a-st-ev1/board/ports/dma_sample.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2020-12-10     thread-liu   first version
 */

#include <board.h>

#if defined(BSP_UART3_RX_USING_DMA) || defined(BSP_USING_UART3)

#include <rtthread.h>

#define SAMPLE_UART_NAME       "uart3"      /* serial device name */

struct rx_msg
{
    rt_device_t dev;
    rt_size_t size;
};
static rt_device_t serial;
static struct rt_messagequeue rx_mq;

static rt_err_t uart_input(rt_device_t dev, rt_size_t size)
{
    struct rx_msg msg;
    rt_err_t result;
    msg.dev = dev;
    msg.size = size;

    result = rt_mq_send(&rx_mq, &msg, sizeof(msg));
    if ( result == -RT_EFULL)
    {
        rt_kprintf("message queue full!\n");
    }
    return result;
}

static void serial_thread_entry(void *parameter)
{
    struct rx_msg msg;
    rt_err_t result;
    rt_uint32_t rx_length;
    static char rx_buffer[RT_SERIAL_RB_BUFSZ + 1];

    while (1)
    {
        rt_memset(&msg, 0, sizeof(msg));
        result = rt_mq_recv(&rx_mq, &msg, sizeof(msg), RT_WAITING_FOREVER);
        if (result == RT_EOK)
        {
            rx_length = rt_device_read(msg.dev, 0, rx_buffer, msg.size);
            rx_buffer[rx_length] = '\0';
            rt_device_write(serial, 0, rx_buffer, rx_length);
        }
    }
}

static int uart_dma_sample(int argc, char *argv[])
{
    rt_err_t ret = RT_EOK;
    char uart_name[RT_NAME_MAX];
    static char msg_pool[256];
    char str[] = "hello RT-Thread!\r\n";

    if (argc == 2)
    {
        rt_strncpy(uart_name, argv[1], RT_NAME_MAX);
    }
    else
    {
        rt_strncpy(uart_name, SAMPLE_UART_NAME, RT_NAME_MAX);
    }

    serial = rt_device_find(uart_name);
    if (!serial)
    {
        rt_kprintf("find %s failed!\n", uart_name);
        return -RT_ERROR;
    }

    rt_mq_init(&rx_mq, "rx_mq",
               msg_pool,
               sizeof(struct rx_msg),
               sizeof(msg_pool),
               RT_IPC_FLAG_FIFO);

    ret = rt_device_open(serial, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_DMA_RX);
    if (ret != RT_EOK)
    {
        rt_kprintf("serial device open fail!.\n");
        return -RT_ERROR;
    }

    ret = rt_device_set_rx_indicate(serial, uart_input);
    if (ret != RT_EOK)
    {
        rt_kprintf("set rx indicate fail!.\n");
        return -RT_ERROR;
    }

    rt_device_write(serial, 0, str, (sizeof(str) - 1));

    rt_thread_t thread = rt_thread_create("serial", serial_thread_entry, RT_NULL, 1024, 25, 10);
    if (thread != RT_NULL)
    {
        rt_thread_startup(thread);
    }
    else
    {
        ret = -RT_ERROR;
    }

    return ret;
}
MSH_CMD_EXPORT(uart_dma_sample, uart device dma sample);

#endif /* BSP_USING_DMA */