test_uart_baudchange.c

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/**
 * @file test_uart_baudchange.c
 * @author Lorenz Meier <lorenz@px4.io>
 */

#include <px4_platform_common/px4_config.h>
#include <px4_platform_common/defines.h>

#include <sys/types.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <string.h>

#include <arch/board/board.h>

#include "tests_main.h"

#include <math.h>
#include <float.h>

int test_uart_baudchange(int argc, char *argv[])
{
    int uart2_nwrite = 0;

    /* assuming NuttShell is on UART1 (/dev/ttyS0) */
    int uart2 = open("/dev/ttyS2", O_RDWR | O_NONBLOCK | O_NOCTTY); //

    if (uart2 < 0) {
        printf("ERROR opening UART2, aborting..\n");
        return uart2;
    }

    struct termios uart2_config;

    struct termios uart2_config_original;

    int termios_state = 0;

    int ret;

    if ((termios_state = tcgetattr(uart2, &uart2_config)) < 0) {
        printf("ERROR getting termios config for UART2: %d\n", termios_state);
        ret = termios_state;
        goto cleanup;
    }

    if ((termios_state = tcgetattr(uart2, &uart2_config_original)) < 0) {
        printf("ERROR getting termios config for UART2: %d\n", termios_state);
        ret = termios_state;
        goto cleanup;
    }

    /* Set baud rate */
    if (cfsetispeed(&uart2_config, B9600) < 0 || cfsetospeed(&uart2_config, B9600) < 0) {
        printf("ERROR setting termios config for UART2: %d\n", termios_state);
        ret = ERROR;
        goto cleanup;
    }

    if ((termios_state = tcsetattr(uart2, TCSANOW, &uart2_config)) < 0) {
        printf("ERROR setting termios config for UART2\n");
        ret = termios_state;
        goto cleanup;
    }

    /* Set back to original settings */
    if ((termios_state = tcsetattr(uart2, TCSANOW, &uart2_config_original)) < 0) {
        printf("ERROR setting termios config for UART2\n");
        ret = termios_state;
        goto cleanup;
    }

    uint8_t sample_uart2[] = {'U', 'A', 'R', 'T', '2', ' ', '#', 0, '\n'};

    int i, r;

    for (i = 0; i < 100; i++) {
        /* uart2 -> */
        r = write(uart2, sample_uart2, sizeof(sample_uart2));

        if (r > 0) {
            uart2_nwrite += r;
        }
    }

    close(uart2);

    printf("uart2_nwrite %d\n", uart2_nwrite);

    return OK;
cleanup:
    close(uart2);
    return ret;

}