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Help with 18F46K22 not exiting sleep on TIMER1 overflow

 
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picnic



Joined: 09 Oct 2008
Posts: 15

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Help with 18F46K22 not exiting sleep on TIMER1 overflow
PostPosted: Wed Jan 04, 2012 5:53 am     Reply with quote
I'm trying to use a single rising edge on TIMER1 (RC0) to trigger a TIMER1 overflow interrupt and to wake the PIC from sleep. The code below works as I'd expect on a 16F887 (different include and fuses) but not on the 18F46K22. In this later case I can see the ISR being called at the appropriate time using an oscilloscope but the PIC doesn't exit sleep and I don't understand why Confused

Code:

#include <18F46K22.h>

#DEVICE ADC=10

#fuses INTRC_IO         // Use Internal OSC
#fuses WDT1024          // 1024 * 4ms = ~4 sec
#fuses NOMCLR
#fuses NOPROTECT        // Protect Programm Memory
#fuses NOCPD            // Protect Data EEPROM

#fuses NOBROWNOUT
#fuses NOFCMEN
#fuses IESO

#fuses TIMER3C0
#fuses CCP2C0


#use delay(clock=4000000)

#use rs232(baud=19200, UART1, STREAM=SerialUI, errors )

#int_timer1
void isr_timer1() {
   set_timer1( 0xffff );
   output_toggle( PIN_E1 );
}

void main() {
   printf( "Hello World\r\n" );

   output_high( PIN_E0 );
   output_high( PIN_E1 );
   output_drive( PIN_E0 );
   output_drive( PIN_E1 );

   setup_timer_1( T1_EXTERNAL | T1_DIV_BY_1 );
   set_timer1( 0xffff );

   enable_interrupts(INT_TIMER1);
   enable_interrupts(GLOBAL);


   while( 1 ) {
      sleep() ;
      restart_wdt();
      output_toggle( PIN_E0 );
   }   
}


Any clues gratefully received, thank you for your time
temtronic



Joined: 01 Jul 2010
Posts: 9241
Location: Greensville,Ontario

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PostPosted: Wed Jan 04, 2012 8:42 am     Reply with quote
Could be a compiler 'bug'..
I'd look at the listing and compare to the one that works.

I'm curious as to what 'output_drive()' does !
Ttelmah



Joined: 11 Mar 2010
Posts: 19535

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PostPosted: Wed Jan 04, 2012 9:57 am     Reply with quote
Output_drive sets the TRIS on the selected bit to '0'. Does nothing in this code, since the tris for each of the bits it is used on, has already been set to '0' by the previous output_high instruction. Only really meant to be used if you have used output_float to turn off the drive on a bit....

Obvious first things that might cause a problem, are TIMER3C0, and CCP2C0. The first puts timer3 on the C0 pin, and the second CCP2 as an output also on this pin However timer1, should still be on this pin. The second big difference with this chip though, is the presence of the gate control on timer1. Though this should be off by default, it is possible that the compiler is not disabling it. Perhaps worth trying defining the bits TMR1ON, and TMR1GE, and trying enabling the first and disabling the second.

Best Wishes
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