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sleep() with re-mappable EXT1 as wake up

 
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marek816



Joined: 06 Aug 2015
Posts: 6

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sleep() with re-mappable EXT1 as wake up
PostPosted: Wed Aug 19, 2015 1:17 pm     Reply with quote
Hi, my code will sleep if I disable INTR_GLOBAL but will not wake from following code.
uP is DSPIC33FJ16GS502
I've tried every combination I can think of. Data sheet says:
"The device will wake-up from Sleep mode on any of
these events:
• Any interrupt source that is individually enabled
• Any form of device Reset
• A WDT time-out"

My interrupt code sets state machine:
Code:

#INT_EXT1
void  IntReedSwitch(void)
{
   printf("EXT1 fired\r\n");
   main_state = POWER_UP_DOWN;   //jump to power up/down
}

My power up or down case from my state machine:

case POWER_UP_DOWN:
            if (sleep_mode==0)
               {
               delay_ms(1000);
               sleep_mode=1;
               disable_interrupts(INTR_GLOBAL);
               disable_interrupts(INT_TIMER1);       
               enable_interrupts(INT_EXT1);
               clear_interrupt(INT_EXT1);
               printf("Going to sleep now!\r\n");
               sleep();             // make processor sleep
               delay_cycles(1); //Avoid problem with the next instruction being fetched
           //    printf("Waking from sleep now!\r\n");
               }
            else
               {
               clear_interrupt(INT_EXT1);
               sleep_mode=0;
               printf("Wakey wakey!\r\n");
              // enable_interrupts(INTR_GLOBAL);
               enable_interrupts(INT_TIMER1);
               }
            main_state = TIMEOUT;   
            break;

The idea is that the EXT1 input makes the uP wake up and also go to sleep (basically an on off push button function).

EXT1 is mapped using RPINR0 = 0x0900; which sets EXT1 to remappable pin 9.

Based on the statement from the datasheet, am I correct to presume I can use EXT1 to wake uP?

Thanks!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Aug 19, 2015 4:43 pm     Reply with quote
If you disable global interrupts, your code will never enter the #INT_EXT1
routine. Therefore, the main_state will never be set to POWER_UP_DOWN.

I think you need to post a complete (but still small) test program.
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