[参考译文] MSP432E401Y：UART 回波模式可中断 UART_WRITE 功能

/*
 *  ======== empty.c ========
 */

/* For usleep() */
#include <unistd.h>
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
// #include <ti/drivers/I2C.h>
// #include <ti/drivers/SPI.h>
#include <ti/drivers/UART.h>
// #include <ti/drivers/Watchdog.h>

/* Driver configuration */
#include "ti_drivers_config.h"

#define MAX_CLI_LENGTH  (8)
unsigned char rxBuffer[MAX_CLI_LENGTH];

/*
 *  ======== mainThread ========
 */
void txCallback(UART_Handle handle, char *buf, size_t count) {}
void rxCallback(UART_Handle handle, char *buf, size_t count);

void *mainThread(void *arg0)
{
    const char  echoPrompt[] = "Echoing characters:\r\n";
    UART_Handle uart;
    UART_Params uartParams;

    /* 1 second delay */
    uint32_t time = 1;

    /* Call driver init functions */
    GPIO_init();
    // I2C_init();
    // SPI_init();
    UART_init();
    // Watchdog_init();

    /* Configure the LED pin */
    GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

    /* Turn on user LED */
    GPIO_write(CONFIG_GPIO_LED_0, CONFIG_GPIO_LED_ON);

    /* Create a UART with data processing off. */
    UART_Params_init(&uartParams);
    uartParams.baudRate = 115200;
    uartParams.readEcho = UART_ECHO_ON;
    uartParams.readMode = UART_MODE_CALLBACK;
    uartParams.readDataMode = UART_DATA_TEXT;
    uartParams.readReturnMode = UART_RETURN_NEWLINE;
    uartParams.readCallback = (UART_Callback)&rxCallback;
    uartParams.writeDataMode = UART_DATA_TEXT;
    uartParams.writeMode = UART_MODE_CALLBACK;
    uartParams.writeCallback = (UART_Callback)&txCallback;

    uart = UART_open(CONFIG_UART_0, &uartParams);

    if (uart == NULL) {
        /* UART_open() failed */
        while (1);
    }

    UART_write(uart, echoPrompt, sizeof(echoPrompt));
    UART_read(uart,&rxBuffer,sizeof(rxBuffer));

    while (1) {
        sleep(time);

        GPIO_toggle(CONFIG_GPIO_LED_0);
    }
}

void rxCallback(UART_Handle handle, char *buf, size_t count) {

//    printf("Read %i = ", count);
//    int i;
//    for(i = 0; i < MAX_CLI_LENGTH; i++) {
//        printf("%d ", (int)(*((buf + i))));
//    }

    char infoMSG[] = "NOT A VALID COMMAND\r\n";
    UART_write(handle, infoMSG, sizeof(infoMSG));

    UART_read(handle,buf,MAX_CLI_LENGTH);
}