RT thread studio learning (VII) using multiple serial ports

brief introduction

This article will be based on STM32F407VET How to introduce the chip RT-Thread Studio Use... In a development environment UART1、UART2、UART3 and UART6 Multiple serial ports .

Can make UART1

In New RT-Thread Project time , You can directly select the console serial port as UART1, see RT-Thread Studio Learning to use an external clock system –> newly build RT-Thread project

Add serial port

modify board.h macro , Add macro definitions of related serial ports BSP_USING_UARTx And modify the pin information , As shown in the figure below

Compile and download the program , Input at the console list_device Command to see that four serial ports have been registered .

test

stay application New under the directory uart_sample.c Source file , As shown below

uart_sample.c The contents of the document are as follows ：

/*
 *  Program listing ： This is a   A serial port   Device usage routines 
 *  Routine exported  uart_sample  Command to control terminal 
 *  Command call format ：uart_sample uart2
 *  Command interpretation ： The second parameter of the command is the serial port device name to be used , If it is blank, the default serial port device will be used 
 *  Program function ： Output string through serial port "hello RT-Thread!"
*/

#include <rtthread.h>

#define SAMPLE_UART_NAME       "uart2"

static rt_device_t serial;

static int uart_sample(int argc, char *argv[])
{
    rt_err_t ret = RT_EOK;
    char uart_name[RT_NAME_MAX];
    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);
    }

    /*  Find the serial port device in the system  */
    serial = rt_device_find(uart_name);
    if (!serial)
    {
        rt_kprintf("find %s failed!\n", uart_name);
        return RT_ERROR;
    }

    /*  Open the serial device in interrupt receiving and polling sending mode  */
    ret = rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
    if (ret != RT_EOK)
    {
        rt_kprintf("open device failed\r\n");
        return -RT_ERROR;
    }


    /*  Send string  */
    rt_size_t send_len = 0;
    send_len = rt_device_write(serial, 0, str, (sizeof(str) - 1));
    if (send_len != sizeof(str) - 1)
    {
        rt_kprintf("send data failed\r\n");
        return -RT_ERROR;
    }
    /*  Turn off the device  */
    ret = rt_device_close(serial);
    if (ret != RT_EOK)
    {
        rt_kprintf("close device failed\r\n");
        return -RT_ERROR;
    }

    rt_kprintf("serial device test successful\r\n");

    return RT_EOK;
}
/*  Export to  msh  In the command list  */
MSH_CMD_EXPORT(uart_sample, uart device sample);

Compile and download the program .
Enter in the console uart_sample command , Can be in UART2 received hello RT-Thread!.
Enter in the console uart_sample uart3 command , Can be in UART3 received hello RT-Thread!.

Reference material

• RT-Thread API Reference manual uart_sample.c
• be based on RT-Thread Studio Serial driver development documentation
• RT-Thread Studio Application development example - Serial devices