MSP430 - 如何将定时器 A1 中断用于不同目的？

Question

Is it possible to use timer A1 interrupts for different purposes with different set of lines?

I get error message that I am declaring the timer A1 interrupts, that I have duplicate declaration. My code has a low power interrupt using timer A1, and An RC charging and discharging circuit which should use timer A1 interrupt.

Is it possible to have duplicate timer interrupts and how it can be done?

Answer 1

You can set up multiple capture and compare registers (CCR) for the timer A1. Each application could use its own. Then in the handler demultiplex by looking at TAIV . From TI sample code for msp430f1611:

void __attribute__ ((interrupt(TIMERA1_VECTOR))) Timer_A1 (void)
{
  switch( TAIV )
  {
  case  2: CCR1 += 1000;                    // Add Offset to CCR1
           break;
  case  4: CCR2 += 10000;                   // Add Offset to CCR2
           break;
  case 10: P1OUT ^= 0x01;                   // Timer_A1 overflow
           break;
 }
}

This MCU has three registers: CCR0, CCR1, and CCR2. Timer A1 interrupt handler is called for CCR1, CCR2, and on overflow of the timer counter ( TAR ). CCR0 is handled by a separate interrupt handler (A0).

Don't try to overwrite the interrupt vector during runtime - that's a terrible idea. On msp430 it also requires reprogramming (part of) the flash. Instead, write a single handler and differentiate the application-specific logic inside it.