I believe your problem is that in the timer A1 ISR, you need to read from
TA0IV in order to clear the interrupt (timer A1 isn't fired from an
interrupt flag but rather from the grouping of events which are then routed
through TA0IV, unless I am mistaken)
17.2.6 Timer_A Interrupts
Two interrupt vectors are associated with the 16-bit Timer_A module:
• TAxCCR0 interrupt vector for TAxCCR0 CCIFG
• TAxIV interrupt vector for all other CCIFG flags and TAIFG
17.2.6.1 TAxCCR0 Interrupt
... The TAxCCR0 CCIFG flag is automatically reset when the TAxCCR0 interrupt
request is serviced.
17.2.6.2 TAxIV, Interrupt Vector Generator
...
Any access, read or write, of the TAxIV register automatically resets the
highest-pending interrupt flag. If
another interrupt flag is set, another interrupt is immediately generated
after servicing the initial interrupt.
...
- Wayne
On Fri, Jul 4, 2014 at 4:22 PM, Kirill Popov <kirill.s.po...@gmail.com>
wrote:
> Hello!
> I've got an issue with using __delay_cycles() while also utilizing
> TimerA interrupts.
> It seems that __delay_cycles(); is not working if TimerA interrupts
> are enabled. Even if nothing is done in interrupt routine.
> Here is a sample code:
> ========== main.c ============
> #include <msp430g2553.h>
>
> // Timer A0 interrupt service routine (at top value)
> #pragma vector=TIMER0_A0_VECTOR
> __interrupt void Timer_A0 (void) {
> TACCTL0 &= ~(TAIFG); // clear interrupt flag
> }
>
> // Timer A1 interrupt service routine (in the middle)
> #pragma vector=TIMER0_A1_VECTOR
> __interrupt void Timer_A1 (void) {
> if (TACCTL1 & TAIFG) {
> TACCTL1 &= ~(TAIFG); // clear interrupt flag
> }
> }
>
> int main(void) {
> WDTCTL = WDTHOLD | WDTPW; //halt watchdog
> P1REN = ~(BIT6); // pull-ups are disabled on pins 0 and 6
> P1DIR |= BIT6; // pins 0 and 6 are outputs
> P1OUT &= ~(BIT6); // pin 6 and pin 0 are LOW
>
> TACCR0 = 0x0fff; // set top value for timerA
> TACCR1 = 0x00ff; //set LED glow power
> TACCTL0 = (CCIE); // enable compare interrupt for TACCR0
> TACCTL1 = (CCIE); // enable compare interrupt for TACCR1
> TACTL = (TASSEL1 | MC0 | TACLR | TAIE); // SMCLK, cnt UP, clear,
> interrupt
> _BIS_SR(GIE); // enable blobal interrupts
> for (;;) {
> P1OUT ^= BIT6;
> __delay_cycles(1000000);
> }
> return 0;
> }
> ======== end of main.c =============
>
> I expect this code to blink with a LED on P1.6 with approximately 1
> second interval (no precise timing required). But all I see is the LED
> just lit all the time.
> If I comment out the line with _BIS_SR(GIE); the LED is blinking as
> expected.
>
> What could be the reason? My guess is interrupt routine is somehow
> spoiling registers used by __delay_cycles(). Is that true?
> Would be thankful for a workaround if there is such.
>
> I'm using msp430-gcc (GCC) 4.6.3 20120301 (mspgcc LTS 20120406
> unpatched) from Debian repository to build code for TI Launchpad
> MSP-EXP430G2 (M430G2553 chip).
>
> Thank you!
> --
> Best regards,
> Kirill Popov.
>
> ----
> Other ways to contact me:
> Gtalk: kirill.s.po...@gmail.com
> Cell phone: +79052062619
> LinkedIn: http://ru.linkedin.com/in/kspopov
>
>
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Quickly connect people, data, and systems into organized workflows
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http://p.sf.net/sfu/Bonitasoft
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