配置：

 

 

 

 

 

 

 

主函数:

#include "ti_msp_dl_config.h"

volatile uint8_t gEchoData = 0;
int main(void)
{
    SYSCFG_DL_init();

    NVIC_ClearPendingIRQ(UART_0_INST_INT_IRQN);                                //先清除中断，防止直接进中断
    NVIC_EnableIRQ(UART_0_INST_INT_IRQN);                                       //允许中断
    DL_SYSCTL_enableSleepOnExit();                                                  //可不要

    while (1) {
        __WFI();                                                                //可不要
    }
}

void UART_0_INST_IRQHandler(void)
{
    switch (DL_UART_Main_getPendingInterrupt(UART_0_INST)) {
        case DL_UART_MAIN_IIDX_RX:
            DL_GPIO_togglePins(GPIO_LEDS_PORT,
                GPIO_LEDS_USER_LED_1_PIN | GPIO_LEDS_USER_TEST_PIN);
            gEchoData = DL_UART_Main_receiveData(UART_0_INST);
            DL_UART_Main_transmitData(UART_0_INST, gEchoData);                          //发送函数
            break;
        default:
            break;
    }
}