Tool/software: TI C/C++ Compiler
I'm trying to test Timer A by using an interrupt to turn a LED on
It doesn't seem to be working any help would be appreciated
void main(void) {
WDT_A_hold(WDT_A_BASE); // disable watchdog
PM5CTL0 &= ~LOCKLPM5;
P1DIR |= BIT0;
TA0CTL = TASSEL_1 + MC__CONTINUOUS + ID__8;
TA0CTL = TAIE_1;
TA0CTL = TAIFG_0;
_enable_interrupt();
}
#pragma vector = TIMER0_A0_VECTOR
__interrupt void TIMERA_ISR(void) {
P1OUT |= BIT0;
}
Hi Steven,
There are a couple of things you need to do.
First, in your code you selected TASSEL_1, which is the ACLK. This is fine as along as you assigned a proper clock source to drive the ACLK.
In my example below I chose the SMCLK to keep it simple.
Next, because you are looking for the timer overflow, you need to use the TIMER0_A1_VECTOR, not TIMER0_A0_VECTOR, which is assigned to the count/compare CCR0. Here is a paragraph from the MSP430FR5994 user's guide.
Next, you should to prevent the code from exiting from main, so a while(1) can be used.
Last, I toggle my LED in my interrupt handler.
I tested this on the MSP430FR5994 launchpad.
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
PM5CTL0 &= ~LOCKLPM5;
P1DIR |= BIT0;
TA0CTL = TASSEL_2 | MC__CONTINUOUS | ID__8;
TA0CTL &= ~(TAIFG_0); // CLEAR IFG
TA0CTL |= TAIE_1; // SET IE
_enable_interrupt();
while(1); //PREVENT CODE FROM EXITING MAIN
}
#pragma vector = TIMER0_A1_VECTOR
__interrupt void TIMERA_TIMER_OVERFLOW_ISR(void) {
P1OUT ^= BIT0; // TOGGLE LED
}
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