Hello,
I am using MSP430fr5969 EVM board and trying to capture signal at P1.1. which is connected to a switch. I want to use timer's capture capability to do that. I configured the timer and the capture registers ( TA0CCTL2 ) as shown below in the code, but no interrupt is generated and nothing captured to the register (TA0CCR2) When I press the button which is connected to P1.1, and also the timer seems to work fine. Can you please review my code help me?. I used MSP430ware 3.6. I want to generate when the signal at P1.1 goes low and capture the timer when this happens.
void main(void)
{
//Stop WDT
WDT_A_hold(WDT_A_BASE);
CS_setDCOFreq(CS_DCORSEL_0,CS_DCOFSEL_4);
CS_initClockSignal(CS_SMCLK,CS_DCOCLK_SELECT,CS_CLOCK_DIVIDER_1);
CS_initClockSignal(CS_MCLK,CS_DCOCLK_SELECT,CS_CLOCK_DIVIDER_1);
//Set P1.0 to output direction
GPIO_setAsOutputPin(GPIO_PORT_P1,GPIO_PIN0);
GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P1,GPIO_PIN1,GPIO_PRIMARY_MODULE_FUNCTION); //P1.1 is used as input capture pinTA0.2
GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P1,GPIO_PIN1);
/*
* Disable the GPIO power-on default high-impedance mode to activate
* previously configured port settings
*/
PMM_unlockLPM5();
//Start timer in continuous mode sourced by SMCLK
Timer_A_initContinuousModeParam initContParam = {0};
initContParam.clockSource = TIMER_A_CLOCKSOURCE_SMCLK;
initContParam.clockSourceDivider = TIMER_A_CLOCKSOURCE_DIVIDER_1;
initContParam.timerInterruptEnable_TAIE = TIMER_A_TAIE_INTERRUPT_DISABLE;
initContParam.timerClear = TIMER_A_DO_CLEAR;
initContParam.startTimer = false;
Timer_A_initContinuousMode(TIMER_A0_BASE, &initContParam);
//Initiaze compare mode
Timer_A_clearCaptureCompareInterrupt(TIMER_A0_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_0);
Timer_A_initCaptureModeParam initCapParam = {0};
initCapParam.captureInputSelect = TIMER_A_CAPTURE_INPUTSELECT_CCIxA;
initCapParam.captureInterruptEnable= TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE;
initCapParam.captureMode = TIMER_A_CAPTUREMODE_FALLING_EDGE;
initCapParam.captureOutputMode = TIMER_A_OUTPUTMODE_OUTBITVALUE;
initCapParam.captureRegister = TIMER_A_CAPTURECOMPARE_REGISTER_2;
initCapParam.synchronizeCaptureSource = TIMER_A_CAPTURE_SYNCHRONOUS;
Timer_A_initCaptureMode(TIMER_A0_BASE, &initCapParam);
Timer_A_enableCaptureCompareInterrupt ( TIMER_A0_BASE,TIMER_A_CAPTURECOMPARE_REGISTER_2 );
Timer_A_startCounter(TIMER_A0_BASE,TIMER_A_CONTINUOUS_MODE);
//Enter LPM0, enable interrupts
__bis_SR_register(LPM0_bits + GIE);
//For debugger
__no_operation();
}
//******************************************************************************
//
//This is the TIMER0_A3 interrupt vector service routine.
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMER0_A1_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(TIMER0_A1_VECTOR )))
#endif
void CCR2_ISR(void)
{
//Toggle P1.0
GPIO_toggleOutputOnPin(
GPIO_PORT_P1,
GPIO_PIN0
);
}
