...write an IRQ interrupt service routine in C?

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Paul Curtis

• July 13, 2009 11:39

Do I need to do anything special to implement an IRQ interrupt service routine in C?

 

If you are using a CPU or board support package then use the supplied functions ctl_set_isr and ctl_unmask_isr to program the interrupt controller of the device.

If you are not using a CPU or board support package then you will have to write the irq_handler in ARM assembly code.

Additionally you will need to call the function libarm_enable_irq to enable interrupts.

9

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  Vantassel

  • October 18, 2013 20:59

  Since these routines are specific to Rowley some example code would be very helpful here.

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  Paul Curtis

  • October 18, 2013 21:01

  Example code in CPU and board support packages.

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  Vantassel

  • October 18, 2013 21:08

  Thanks Paul, I'm on an ADuC7020, so I've been studying the code in Analog_ADuC7000.c.  So is it safe to say that my example is in ctl_start_timer?

   void
  ctl_start_timer(CTL_ISR_FN_t isr)
  {
    T0LD = TIMER_RECHARGE;
  #if __TARGET_PROCESSOR == ADuC7060 || __TARGET_PROCESSOR == ADuC7061
    T0CON = 0xC4 | (2 << T0CON_T0CLKSEL_BIT); /* 10.24MHz, Timer 0 enable, periodic, core clock / 16 */
  #else
    T0CON = 0xC4; /* Timer 0 enable, periodic, core clock / 16 */
  #endif
    userTimerISR = isr;
    ctl_set_isr(TIMER0_INT, 0, CTL_ISR_TRIGGER_FIXED, timerISR, 0);
    ctl_unmask_isr(TIMER0_INT);
  }
  
  
  

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