#include "msp430.h"
#define NUMBER_TIMER_CAPTURES 20
volatile unsigned int timerAcaptureValues[NUMBER_TIMER_CAPTURES];
unsigned int timerAcapturePointer = 0;
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
// Configure GPIO
P1OUT &= ~0x01; // Clear P1.0 output
P1DIR |= 0x01; // Set P1.0 to output direction
// Disable the GPIO power-on default high-impedance mode to activate
// previously configured port settings
PM5CTL0 &= ~LOCKLPM5;
// Clock System Setup
CSCTL0_H = CSKEY >> 8; // Unlock CS registers
CSCTL2 &= ~SELA_7;
CSCTL2 |= SELA__VLOCLK; // Select ACLK=VLOCLK
CSCTL0_H = 0x00; // Lock CS module (use byte mode to upper byte)
__delay_cycles(1000); // Allow clock system to settle
// Timer0_A3 Setup
TA0CCTL2 = CM_1 | CCIS_1 | SCS | CAP | CCIE;
// Capture rising edge,
// Use CCI2B=ACLK,
// Synchronous capture,
// Enable capture mode,
// Enable capture interrupt
TA0CTL = TASSEL__SMCLK | MC__CONTINUOUS; // Use SMCLK as clock source,
// Start timer in continuous mode
__bis_SR_register(LPM0_bits | GIE);
__no_operation();
}
// Timer0_A3 CC1-4, TA Interrupt Handler
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER0_A1_VECTOR
__interrupt void Timer0_A1_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER0_A1_VECTOR))) Timer0_A1_ISR (void)
#else
#error Compiler not supported!
#endif
{
switch (__even_in_range(TA0IV, TA0IV_TAIFG)) {
case TA0IV_TA0CCR1:
break;
case TA0IV_TA0CCR2:
timerAcaptureValues[timerAcapturePointer++] = TA0CCR2;
if (timerAcapturePointer >= 20) {
while (1) {
P1OUT ^= 0x01; // Toggle P1.0 (LED)
__delay_cycles(100000);
}
}
break;
case TA0IV_TA0IFG:
break;
default:
break;
}
}
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