MSP430串口的例程问题

采用MSP430FR2433IRGER单片机，总中断，一开就跑飞了，如下图：

不知道是什么原因？

Ben Qin：

你好，看下错误截图。

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user5916746：

目前看截图看不出来什么原因？不知道如何解决这个问题？

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Ben Qin：

你是否配置了ISR？看门狗是否关闭？我需要看下你具体跑飞现象，方便的话也请发下ISR。

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user5916746：

eusci_a_uart_ex1_loopbackAdvanced.c

/* --COPYRIGHT--,BSD* Copyright (c) 2017, 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--*/
//******************************************************************************
//!EUSCI_A0 External Loopback test using EUSCI_A_UART_init API
//!
//!Description: This demo connects TX to RX of the MSP430 UART
//!The example code shows proper initialization of registers
//!and interrupts to receive and transmit data.
//!
//!SMCLK = MCLK = BRCLK = DCOCLKDIV = ~1MHz, ACLK = 32.768kHz
//!
//!
//!MSP430FR2xx_4xx Board
//!-----------------
//!RST -|UCA0TXD|----|
//!|||
//!|||
//!|UCA0RXD|----|
//!||
//!
//! This example uses the following peripherals and I/O signals. You must
//! review these and change as needed for your own board:
//! - UART peripheral
//! - GPIO Port peripheral (for UART pins)
//! - UCA0TXD
//! - UCA0RXD
//!
//! This example uses the following interrupt handlers. To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - USCI_A0_VECTOR.
//******************************************************************************
#include "driverlib.h"
#include "Board.h"uint16_t i;
uint8_t RXData = 0, TXData = 0;
uint8_t check = 0;void main(void)
{//Stop Watchdog TimerWDT_A_hold(WDT_A_BASE);//__disable_interrupt();//Set ACLK = REFOCLK with clock divider of 1CS_initClockSignal(CS_ACLK,CS_REFOCLK_SELECT,CS_CLOCK_DIVIDER_1);//Set SMCLK = DCO with frequency divider of 1CS_initClockSignal(CS_SMCLK,CS_DCOCLKDIV_SELECT,CS_CLOCK_DIVIDER_1);//Set MCLK = DCO with frequency divider of 1CS_initClockSignal(CS_MCLK,CS_DCOCLKDIV_SELECT,CS_CLOCK_DIVIDER_1);//Configure UART pinsGPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_UCA0TXD,GPIO_PIN_UCA0TXD,GPIO_FUNCTION_UCA0TXD);GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_UCA0RXD,GPIO_PIN_UCA0RXD,GPIO_FUNCTION_UCA0RXD);/** Disable the GPIO power-on default high-impedance mode to activate* previously configured port settings*/PMM_unlockLPM5();//Configure UART//SMCLK = 1MHz, Baudrate = 115200//UCBRx = 8, UCBRFx = 0, UCBRSx = 0xD6, UCOS16 = 0EUSCI_A_UART_initParam param = {0};param.selectClockSource = EUSCI_A_UART_CLOCKSOURCE_SMCLK;param.clockPrescalar = 8;param.firstModReg = 0;param.secondModReg = 0xD6;param.parity = EUSCI_A_UART_NO_PARITY;param.msborLsbFirst = EUSCI_A_UART_LSB_FIRST;param.numberofStopBits = EUSCI_A_UART_ONE_STOP_BIT;param.uartMode = EUSCI_A_UART_MODE;param.overSampling = EUSCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION;if (STATUS_FAIL == EUSCI_A_UART_init(EUSCI_A0_BASE, &param)) {return;}EUSCI_A_UART_enable(EUSCI_A0_BASE);EUSCI_A_UART_clearInterrupt(EUSCI_A0_BASE,EUSCI_A_UART_RECEIVE_INTERRUPT);// Enable USCI_A0 RX interruptEUSCI_A_UART_enableInterrupt(EUSCI_A0_BASE,EUSCI_A_UART_RECEIVE_INTERRUPT);// Enable global interrupts//__enable_interrupt();while (1){// Increment TX dataTXData = TXData+1;// Load data onto bufferEUSCI_A_UART_transmitData(EUSCI_A0_BASE, TXData);while(check != 1);check = 0;}
}
//******************************************************************************
//
//This is the USCI_A0 interrupt vector service routine.
//
//******************************************************************************
//#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt
//#elif defined(__GNUC__)
//__attribute__((interrupt(USCI_A0_VECTOR)))
//#endifvoid EUSCI_A0_ISR(void)
{switch(__even_in_range(UCA0IV,USCI_UART_UCTXCPTIFG)){case USCI_NONE: break;case USCI_UART_UCRXIFG:RXData = EUSCI_A_UART_receiveData(EUSCI_A0_BASE);// Check valueif(!(RXData == TXData)){while(1);}check =1;break;case USCI_UART_UCTXIFG: break;case USCI_UART_UCSTTIFG: break;case USCI_UART_UCTXCPTIFG: break;}
}

麻烦帮忙看下，谢谢！

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Ben Qin：

程序应该是有bug，将下图中的内容改一下：

改成: GPIO_setAsPeripheralModuleFunctionOutputPin

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Amter Cai：

case USCI_UART_UCRXIFG:    RXData = EUSCI_A_UART_receiveData(EUSCI_A0_BASE);    // Check value    if(!(RXData == TXData))    {        // Set flag indicating data mismatch        check = 1;    }    break;

这样呢

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Ben Qin：

有可能是进入了死循环。请试一下。

Ben Qin 说：改成: GPIO_setAsPeripheralModuleFunctionOutputPin

但这里是要改的。