【TI 测评】TI-MSP432P401R LanchPad评测（三）串口发送测试

void EUSCIA0_IRQHandler(void)
{
    if (EUSCI_A0->IFG & EUSCI_A_IFG_RXIFG)
    {
        // Check if the TX buffer is empty first
       while(!(EUSCI_A0->IFG & EUSCI_A_IFG_TXIFG));
         EUSCI_A0->TXBUF=i+'0';
       while(!(EUSCI_A0->IFG & EUSCI_A_IFG_TXIFG));
        EUSCI_A0->TXBUF=':';
     //   while(!(EUSCI_A0->IFG & EUSCI_A_IFG_TXIFG));
       i++;
        // Echo the received character back
       while(!(EUSCI_A0->IFG & EUSCI_A_IFG_TXIFG));
        EUSCI_A0->TXBUF = EUSCI_A0->RXBUF;
        while(!(EUSCI_A0->IFG & EUSCI_A_IFG_TXIFG));
       EUSCI_A0->TXBUF='\n';
    }
}

int  fputc(int _c, register FILE *_fp)
{
    MAP_UART_transmitData( DEBUG_UART_MODULE , (uint8_t) _c);
     while (!MAP_UART_getInterruptStatus(DEBUG_UART_MODULE,
                                        EUSCI_A_UART_TRANSMIT_INTERRUPT_FLAG))；
     EUSCI_A_CMSIS(DEBUG_UART_MODULE)->IFG |= (EUSCI_A_UART_TRANSMIT_INTERRUPT_FLAG);
    return _c;
}
int  fputs(const char *_ptr, register FILE *_fp)
{
uint16_t i, len;
len = strlen(_ptr);
for(i=0; i<len; i++)
{
MAP_UART_transmitData( DEBUG_UART_MODULE , (unsigned char)_ptr[i] );
while (!MAP_UART_getInterruptStatus(DEBUG_UART_MODULE,
EUSCI_A_UART_TRANSMIT_INTERRUPT_FLAG));
EUSCI_A_CMSIS(DEBUG_UART_MODULE)->IFG |= (EUSCI_A_UART_TRANSMIT_INTERRUPT_FLAG);
}
    return len;

}

/*
 * -------------------------------------------
 *    MSP432 DriverLib - v3_21_00_05 
 * -------------------------------------------
 *
 * --COPYRIGHT--,BSD,BSD
 * Copyright (c) 2016, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * --/COPYRIGHT--*/
/******************************************************************************
 * MSP432 UART - PC Echo with 12MHz BRCLK
 *
 * Description: This demo echoes back characters received via a PC serial port.
 * SMCLK/DCO is used as a clock source and the device is put in LPM0
 * The auto-clock enable feature is used by the eUSCI and SMCLK is turned off
 * when the UART is idle and turned on when a receive edge is detected.
 * Note that level shifter hardware is needed to shift between RS232 and MSP
 * voltage levels.
 *
 *               MSP432P401
 *             -----------------
 *            |                 |
 *            |                 |
 *            |                 |
 *       RST -|     P1.3/UCA0TXD|----> PC (echo)
 *            |                 |
 *            |                 |
 *            |     P1.2/UCA0RXD|<---- PC
 *            |                 |
 *
 * Author: Timothy Logan
*******************************************************************************/
/* DriverLib Includes */
#include "driverlib.h"

/* Standard Includes */
#include <stdint.h>

#include <stdbool.h>

/* UART Configuration Parameter. These are the configuration parameters to
 * make the eUSCI A UART module to operate with a 9600 baud rate. These
 * values were calculated using the online calculator that TI provides
 * at:
 *software-dl.ti.com/.../index.html
 */
const eUSCI_UART_Config uartConfig =
{
        EUSCI_A_UART_CLOCKSOURCE_SMCLK,          // SMCLK Clock Source
        78,                                     // BRDIV = 78
        2,                                       // UCxBRF = 2
        0,                                       // UCxBRS = 0
        EUSCI_A_UART_NO_PARITY,                  // No Parity
        EUSCI_A_UART_LSB_FIRST,                  // LSB First
        EUSCI_A_UART_ONE_STOP_BIT,               // One stop bit
        EUSCI_A_UART_MODE,                       // UART mode
        EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION  // Oversampling
};

int main(void)
{
    /* Halting WDT  */
    MAP_WDT_A_holdTimer();

    /* Selecting P1.2 and P1.3 in UART mode */
    MAP_GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1,
            GPIO_PIN1 | GPIO_PIN2 | GPIO_PIN3, GPIO_PRIMARY_MODULE_FUNCTION);

    /* Setting DCO to 12MHz */
    CS_setDCOCenteredFrequency(CS_DCO_FREQUENCY_12);

    /* Configuring UART Module */
    MAP_UART_initModule(EUSCI_A0_BASE, &uartConfig);

    /* Enable UART module */
    MAP_UART_enableModule(EUSCI_A0_BASE);

    /* Enabling interrupts */
    MAP_UART_enableInterrupt(EUSCI_A0_BASE, EUSCI_A_UART_RECEIVE_INTERRUPT);
    MAP_Interrupt_enableInterrupt(INT_EUSCIA0);
    MAP_Interrupt_enableSleepOnIsrExit();
    MAP_Interrupt_enableMaster();   

    while(1)
    {
        MAP_PCM_gotoLPM0();
    }
}

/* EUSCI A0 UART ISR - Echoes data back to PC host */
void EUSCIA0_IRQHandler(void)
{
    uint32_t status = MAP_UART_getEnabledInterruptStatus(EUSCI_A0_BASE);

    MAP_UART_clearInterruptFlag(EUSCI_A0_BASE, status);

    if(status & EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG)
    {
        MAP_UART_transmitData(EUSCI_A0_BASE, MAP_UART_receiveData(EUSCI_A0_BASE));
    }

}