Timer 1 modulo mode interrupt

sw ng

Other Parts Discussed in Thread: CC2530

Hello everyone. I am learning to use the CC2530. I set the program below to test the Timer 1 interrupt. But it does not work. The T1_ISR was never called. If I use the free running mode, i.e. T1CTL |= 0x01, the program work normal.

void T1_ISR (void) __interrupt 9
{
    EA=0;
    flag +=1 ;
    if (flag<2) {
       P1_0=0;
    } else {
       P1_0=1;
    };
    if (flag>2) flag=0 ;
    EA=1;
}

void main(void)
{
   EA=0;
   T1CTL=0;
   TIMIF=0x00;
   IEN0=0;
   IEN1=0;
   IEN2=0;
   P1DIR |= 0x01 ;
   P1_0=0;
   T1CTL |= 0x0C; // prescaler = 128
   T1CNTL=0; // reset timer
   T1CC0H = 0xFF;
   T1CC0L = 0x00;
   T1CTL |= 0x02; // timer 1 in modulo mode
   T1STAT &= ~0x01;
    IEN1 |= 0x02; // IEN1.T1EN = 1
    TIMIF=0x40;
    EA=1;
    for (;;) {   };
}

So, do I misundestand the usage of the Timer 1 in modulo mode?

Thanks in advance for any hint.

over 15 years ago

0 GrantC over 15 years ago

TI__Expert 3940 points

Ng,

One suggestion might be to compare your code to the timer-1 modulo code in the CC2530 software examples (http://www.ti.com/litv/zip/swrc135b). Look at halTimer32kInit() and halTimer32kRestart() in hal_timer_32k.c. Your code looks very similar, but maybe there's some small difference that's causing your problems.

-GrantC

0 sw ng over 15 years ago in reply to GrantC

Prodigy 80 points

Thanks for the suggestion. I found the missing code. I should use T1CCTL0 = 0x44 to setup the timer to work in compare mode.

0 Elian Lima over 13 years ago in reply to sw ng

Expert 1895 points

Hello,

I used the same code with the T1CCTL modification but it didn´t work.

Sub-1 GHz

Sub-1 GHz forum

Timer 1 modulo mode interrupt