MSP430FG439,使用捕获功能测频率时中断冲突问题

待测频率80Khz是可以测量的，在数据手册内有相关的说明

www.ti.com.cn/.../msp430fg439.pdf

5.6 Inputs Px.y, TAx, TBx

在G2553有相关的测试例程，您可以参考一下写法

dev.ti.com/.../node

抱歉，目前手边没有MSP430FG系列的板子，我回头找一下其他板子来测试一下

已参考该例程进行测试，DEBUG时，程序会在如下程序不断循环：

        if (TB0CCTL1 & COV)                   // Check for Capture Overflow
            while(1);

测试程序如下：

#include <msp430fg439.h>
#include "main.h"


unsigned long SMCLK_Count_Num = 0;
unsigned long Frequency = 0;
unsigned char Count = 0x0;
unsigned int REdge1, REdge2;


void main(void)
{
    WDTCTL = WDTPW | WDTHOLD;    // stop watchdog timer
    SetupClock();
    Capture_Pos();
//    __enable_interrupt();//中断使能
    while(1)
    {
//        __enable_interrupt();//中断使能
        __bis_SR_register(LPM0_bits + GIE);   // Enter LPM0
        __no_operation();                     // For debugger
        if (TB0CCTL1 & COV)                   // Check for Capture Overflow
            while(1);

            SMCLK_Count_Num = REdge2 - REdge1;
            Frequency = (Count*SMCLK_Frequency)/SMCLK_Count_Num;
//            TBCTL |= TBCLR + TBIE;
//            TBCCTL1 |= CCIE;
    }
}


void SetupClock()
{
    uint16_t tmpv;
    FLL_CTL1 &= ~XT2OFF;         //开启外部振荡器
    do
    {
        IFG1 &= ~OFIFG;           //清除晶振失效标志
        for (tmpv = 0xff; tmpv > 0; tmpv--);
    }
    while((IFG1 & OFIFG)!=0);    //*等待外部晶振就绪
    IFG1 &= ~OFIFG;
    FLL_CTL1 |= SELM_XT2+SELS;           //选择MCLK,选择SMCLK //+DIVM_1
}


void Capture_Pos()//TIMER_B 捕获/比较寄存器 0
{
    P2SEL |= BIT2;            //TB1端口
    P2DIR &= ~BIT2;
    //SMCLK做时钟源，16位计数器，不分频，连续计数模式，开中断
    TB0CTL |= TBSSEL_2 + MC_2 + TBCLR ;
    TBCCTL1 = CM_1+ CCIS_1 + SCS + CAP + CCIE;//上升沿触发，同步捕获,使能中断CCI1B
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMERB1_VECTOR
__interrupt void TIMER0_B1_ISR (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER0_B1_VECTOR))) TIMER0_B1_ISR (void)
#else
#error Compiler not supported!
#endif
//__interrupt void Timer_B1 (void)
{
    switch(__even_in_range(TB0IV,0x0A))     //需要判断中断的类型
    {
        case TB0IV_NONE:
            break;
        case TB0IV_TBCCR1:
            if (!Count)
            {
                REdge1 = TB0CCR1;
                Count++;
            }
            else
            {
                REdge2 = TB0CCR1;
                Count=0x0;
//                TBCTL &= ~TBIE;
//                TBCCTL1 &=~CCIE;
                __bic_SR_register_on_exit(LPM0_bits + GIE);  // Exit LPM0 on return to main
            }
            break;
        case TB0IV_TBCCR2:
            break;
        case TBIV_3:
            break;
        case TBIV_4:
            break;
        case TBIV_5:
            break;
        case TBIV_6:
            break;
        case TB0IV_TBIFG:
            break;
        default:
           break;
    }
}

好的，谢谢反馈

我手边没有这个板子，拿G2553的板子来测试一下后回复

例程已经可以在开发板跑通，尝试在此程序运行基础上，将更大频率的信号接入开发板，程序会停在while(1)循环内