luban-lite/bsp/examples/test-uart/test_uart.c

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date         Author          Notes
 * 2018-08-15   misonyo         first implementation.
 * 2023-05-25   geo.dong        ArtInChip
 */

#include <rtthread.h>
#include <aic_core.h>
#define SAMPLE_UART_NAME "uart4"

static struct rt_semaphore rx_sem;
static rt_device_t serial;

static rt_err_t uart_input(rt_device_t dev, rt_size_t size)
{
    rt_sem_release(&rx_sem);
    return RT_EOK;
}
static void serial_thread_entry(void *parameter)
{
    char ch;
    int ret = 0;
    while (1)
    {
        ret = rt_device_read(serial, -1, &ch, 1);
        if (ret == 1) {
            printf("--ch %c \n", ch);
            // ch = ch + 1;
        } else if (ret == 0) {
            printf("--ret == 0, ch [%c] \n", ch);
            rt_device_close(serial);
            rt_sem_detach(&rx_sem);
            return;
        } else {
            printf("--RT_WAITING_FOREVER \n");
            rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
            aicos_msleep(1);
        }
    }
}

static int test_uart(int argc, char *argv[])
{
    rt_err_t ret = RT_EOK;
    char uart_name[RT_NAME_MAX];
    char str[] = "ArtInChip Uart Test!";
    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_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);

    rt_device_open(serial, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX);

    rt_device_set_rx_indicate(serial, uart_input);

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

    // NOTE: thread stack-size at least for 1024*2 Bytes !!!
    rt_thread_t thread = rt_thread_create("serial", serial_thread_entry, RT_NULL, 1024*2, 25, 10);

    if (thread != RT_NULL)
    {
        rt_thread_startup(thread);
    }
    else
    {
        ret = RT_ERROR;
    }
    return ret;
}

MSH_CMD_EXPORT(test_uart, ArtInChip Uart Test);