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PIC16f1825 wakeup from Comparator

 
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alan



Joined: 12 Nov 2012
Posts: 357
Location: South Africa

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PIC16f1825 wakeup from Comparator
PostPosted: Tue Jun 18, 2019 7:53 am     Reply with quote
CCS 5.076

Trying to get the PIC to wake up from comparator interrupt without success.
Comparator works perfect when not in sleep.
Here are the code
Code:
#include <16F1825.h>
#device ADC=10

#FUSES NOMCLR
#use delay(internal=32000000)


#define LED PIN_A2
#include <stdint.h>
#byte CM2CON0 = getenv("SFR:CM2CON0")

void main() {
  uint16_t Cnt;
  output_high(LED);
  delay_ms(500);
  output_toggle(LED);
  delay_ms(500);
  output_toggle(LED);
  delay_ms(500);
  output_low(LED);
  setup_timer_2(T2_DIV_BY_1,252,8);      //126 us overflow, 1.0 ms interrupt

  setup_comparator(CP2_C2_C0 | CP2_INVERT | CP2_INT_L2H);

  enable_interrupts(INT_COMP2);
//  enable_interrupts(GLOBAL);

   while(TRUE) {
    //This are to prove that the comparator are actually working by toggling a LED when an interrupt occurs
    if (interrupt_active(INT_TIMER2)) {
     clear_interrupt(INT_TIMER2);
     if (interrupt_active(INT_COMP2)) {
       clear_interrupt(INT_COMP2);
         output_toggle(LED);
     }
    }
    Cnt = CM2CON0;   
    clear_interrupt(INT_COMP2);
    sleep();
    //To check when it comes out of sleep
    delay_cycles(1);
    output_toggle(LED);
    delay_ms(500);
    output_toggle(LED);
  }
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Jun 18, 2019 9:33 am     Reply with quote
Here is part of the interrupt list from the 16F1825.h file.
The one you need is shown in bold. Enable it. This one
acts as a gate for the comparator interrupt and others.
Quote:

#define GLOBAL 0x0BC0
#define PERIPH 0x0B40
#define INT_EXT_L2H 0x50000B10
#define INT_EXT_H2L 0x60000B10
#define INT_EXT 0x300B10
#define INT_TIMER0 0x300B20
#define INT_TIMER1 0x309101
#define INT_TIMER2 0x309102
alan



Joined: 12 Nov 2012
Posts: 357
Location: South Africa

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PostPosted: Tue Jun 18, 2019 9:51 am     Reply with quote
Well done PCM.
Armed with this info I looked through the datasheet again and noticed it, probably won't forget this one in a while, and even then I probably would have used the getenv to locate the bit.

Thanks again
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