[参考译文] MSP430F5529：PWM/定时器中断代码不工作

https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1235058/msp430f5529-pwm-timer-interrupt-code-not-working

根据下面的代码、目标是根据计时器配置函数串联产生蜂鸣声。 第一个值是计时器周期、然后是占空比、第三个值是要产生的蜂鸣声数量。

因此、根据现有函数、将计时器周期设置为32768、占空比为16384、蜂鸣次数为4。 但代码在我的 MSP430F5529 LP 上没有按预期运行。

#include <driverlib.h>

//Tested on MSP430F5529LP

int tCount; dutyCycle;
int beepCount; int counter; int newDutyCycle;
int countval = 0; int

void init();
int timer_config(int newPeriod, int newDutyCycle, int beep);
void stop_timer();

void main(){

    init();
    timer_config(32768,16384, 4);             //Configure timer

    while(1){
    }

    __bis_SR_register(LPM0 + GIE); //Enter Low Power Mode
    __no_operation();           //Enter Debugger Mode
}

void init() {

    WDT_A_hold(WDT_A_BASE);     //Stop Watchdog Timer

    GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P2, GPIO_PIN0); //Set Pin 2.0 as output pin

    //Configure Timer
    Timer_A_initUpModeParam param = {0};
    param.clockSource = TIMER_A_CLOCKSOURCE_ACLK; // ~1045000Hz
    param.clockSourceDivider = TIMER_A_CLOCKSOURCE_DIVIDER_1; //~18660Hz
    param.timerPeriod = 32768;
    param.timerInterruptEnable_TAIE = TIMER_A_TAIE_INTERRUPT_DISABLE;
    param.captureCompareInterruptEnable_CCR0_CCIE = TIMER_A_CCIE_CCR0_INTERRUPT_ENABLE;
    param.timerClear = TIMER_A_DO_CLEAR;
    param.startTimer = false;
    Timer_A_initUpMode(TIMER_A1_BASE, &param);

    //Configure Capture Compare Register
    Timer_A_initCompareModeParam paramCCR1 = {0};
    paramCCR1.compareRegister = TIMER_A_CAPTURECOMPARE_REGISTER_1;
    paramCCR1.compareInterruptEnable = TIMER_A_CAPTURECOMPARE_INTERRUPT_ENABLE;
    paramCCR1.compareOutputMode = TIMER_A_OUTPUTMODE_RESET_SET;
    paramCCR1.compareValue = 16384;
    Timer_A_initCompareMode(TIMER_A1_BASE, &paramCCR1);
}

int timer_config(int newPeriod, int newDutyCycle, int beep){

    Timer_A_setCompareValue(TIMER_A1_BASE,
                                 TIMER_A_CAPTURECOMPARE_REGISTER_0,
                                 newPeriod);
    Timer_A_setCompareValue(TIMER_A1_BASE,
                                 TIMER_A_CAPTURECOMPARE_REGISTER_1,
                                 newDutyCycle);
    Timer_A_clear(TIMER_A1_BASE);
    Timer_A_startCounter(TIMER_A1_BASE, TIMER_A_UP_MODE);


    if (countval==beep)
    {
        countval==0;
        stop_timer();
    }
    }

void stop_timer(){
        Timer_A_stop(TIMER_A1_BASE);
        Timer_A_disableInterrupt(TIMER_A1_BASE);
    }

#pragma vector = TIMER1_A0_VECTOR
__interrupt void timer1_ISR(void) {
    GPIO_setOutputLowOnPin(GPIO_PORT_P2, GPIO_PIN0);
    Timer_A_clearTimerInterrupt(TIMER_A1_BASE);
}

#pragma vector = TIMER1_A1_VECTOR
__interrupt void timer0_ISR(void) {
    switch(__even_in_range(TA0IV, TA0IV_TAIFG)) {
    case TA0IV_NONE: break;
    case TA0IV_TACCR1:
        GPIO_setOutputHighOnPin(GPIO_PORT_P2, GPIO_PIN0);
        countval++;
        Timer_A_clearTimerInterrupt(TIMER_A1_BASE);
        break;
    case TA0IV_TACCR2: break;
    case TA0IV_TACCR3: break;
    case TA0IV_TACCR4: break;
    case TA0IV_5:      break;
    case TA0IV_6:      break;
    case TA0IV_TAIFG:  break;
    default: _never_executed();
    }
}