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Deep Sleep wake up on INT0 !
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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Tue Jun 07, 2011 6:14 pm

This code appears to do what you want. Here is the output on TeraTerm:

Quote:

DSWAKEL: 01 // DSPOR bit = 1. This is the initial power-up of the board.
DSWAKEH: 00

//-------------------
// Next, I pressed the pushbutton on Pin B0.
DSWAKEL: 00
DSWAKEH: 01 // DSINT0 = 1. The board woke-up on the falling edge.

// Then I released the pushbutton on pin B0.
DSWAKEL: 00
DSWAKEH: 01 // DSINT0 = 1. The board did a wake-up on the rising edge.

//-------------------
// Then I press and release the button again. It works here too.

DSWAKEL: 00
DSWAKEH: 01

DSWAKEL: 00
DSWAKEH: 01
//----------------------
And again, and it still works.

DSWAKEL: 00
DSWAKEH: 01

DSWAKEL: 00
DSWAKEH: 01

The pushbutton circuit looks like this:

Code:

+3.3v
|
<
> 10K
< ___ Push button switch
To | _|_|_
pin -----------------o o------
B0 |
--- GND
-

Here is the test program. I don't know if all the 10ms delays in here are
necessary. Some of them are. This program was tested with compiler
versions 4.095 and 4.121.

Code:

#include <18F24J11.h>
#fuses HS, NOWDT
#use delay(crystal=20M)
#use rs232(baud=9600, UART1, ERRORS)

#byte WDTCON = 0xFC0
#byte DSCONH = 0xF4D
#byte DSCONL = 0xF4C
#byte RTCCFG = 0xF3F
#byte DSWAKEH= 0xF4b
#byte DSWAKEL= 0xF4a
#byte OSCCON = 0xFD3

#bit IDLEN =OSCCON.7 // Used to set IDLE low-power mode
#bit DSEN = DSCONH.7 // Used to set deep sleep
#bit REGSLP =WDTCON.7
#bit RELEASE = DSCONL.0
#bit RTCSYNC = RTCCFG.4
#bit DS_WAKEUP_BIT = WDTCON.3 // Bit that detects wake up from DS
#bit DSRTC = DSWAKEL.3

//==============================================
void main(void)
{

// Release the PIC's i/o pins for normal operation
// after waking up from Deep Sleep. Important !
RELEASE = 0;
delay_ms(10);

printf("\n\r");
printf("DSWAKEL: %x \n\r", DSWAKEL);
printf("DSWAKEH: %x \n\r", DSWAKEH);
delay_ms(10);

// Clear the wake-up source registers, regardless
// of what the PIC data sheet says.
DSWAKEL = 0;
DSWAKEH = 0;

// Look at the current state of the push-button switch.
// Based on that, set the edge that we expect to see next.
if(input(PIN_B0) == 1) // If switch is high
ext_int_edge(H_TO_L); // Then expect a falling edge next
else // If switch is low
ext_int_edge(L_TO_H); // Then expect a rising edge next

clear_interrupt(INT_EXT);
enable_interrupts(INT_EXT);
delay_ms(10);

// Enable Deep Sleep mode.
REGSLP = 1; // enable low-power operation in sleep mode
IDLEN = 0;
#asm // Time-critical section must be in ASM
BSF DSEN
SLEEP
NOP
#endasm

printf("Should never get here\n\r");

while(1);
}

heUAcyp

Joined: 16 Mar 2011
Posts: 33

Posted: Wed Jun 08, 2011 6:12 am

Sir thank you very very much for your help.

Interrupt is working with a small problem. I have tested the suggested code and get the expected results on the HyperTerminal:

Quote:

DS_WAKEUP_BIT: 00
DS_WAKEUP_BIT: 00
DSWAKEH: 00
DSWAKEL: 00

DS_WAKEUP_BIT: 01
DS_WAKEUP_BIT: 01
DSWAKEH: 01
DSWAKEL: 00

DS_WAKEUP_BIT: 01
DS_WAKEUP_BIT: 01
DSWAKEH: 01
DSWAKEL: 00

The code I am using is:

Code:

#include <18F25J11.h>
#device ADC=10
#include <STDIO.H>
#include <stdlib.h>
#include <math.h>
#include <STRING.H>
#include <2408.c>

#fuses HS,NOWDT,NOPROTECT
#use delay(clock=4000000)
#use rs232 (baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//
#byte WDTCON = 0xFC0
#byte DSCONH = 0xF4D
#byte DSCONL = 0xF4C
#byte RTCCFG = 0xF3F
#byte DSWAKEH= 0xF4b
#byte DSWAKEL= 0xF4a
#byte OSCCON = 0xFD3
#byte INTCON = 0xFF2
#byte INTCON2 = 0xFF1
//
#bit IDLEN=OSCCON.7 // used to set IDLE low-power mode ( will be set to zero for both deep-sleep and sleep modes)
#bit DSEN = DSCONH.7 // used to set deep sleep (1 for deep-sleep)
#bit REGSLP =WDTCON.7
#bit RELEASE = DSCONL.0
#bit RTCSYNC = RTCCFG.4
#bit DSINT0 = DSWAKEH.0 // bit for INT0 interrupt - change detection
#bit DS_WAKEUP_BIT = WDTCON.3 // bit that detects wake up from deep sleep
#bit INT0IE = INTCON.4
#bit INT0IF = INTCON.1
#bit INTEDG0 = INTCON2.6

void EnterDeepSleep()
{
// Enable Deep Sleep mode.
REGSLP = 1; // enable low-power operation in sleep mode
IDLEN = 0;
#asm // Time-critical section must be in ASM
BSF DSEN
SLEEP
NOP
#endasm
}

void PerformingTaskON()
{
output_high(PIN_A1) ;

}
void main()
{
//disable_interrupts(GLOBAL);

RELEASE = 0; // Activate i/o pins
delay_ms(10);

printf("\n\r\n\r");
printf("DS_WAKEUP_BIT: %x \n\r", DS_WAKEUP_BIT);
delay_ms(10);
printf("DS_WAKEUP_BIT: %x \n\r", DSINT0);
delay_ms(10);
printf("DSWAKEH: %x \n\r", DSWAKEH);
delay_ms(10);
printf("DSWAKEL: %x \n\r", DSWAKEL);
delay_ms(10);
//
if((DS_WAKEUP_BIT == 1) && (DSWAKEH == 1)&&(DSINT0==1))
{
PerformingTaskON() ;
delay_ms(200);
DSWAKEL = 0;
DSWAKEH = 0;
}

// Clear the wake-up source registers, regardless
// of what the PIC data sheet says.
DSWAKEL = 0;
DSWAKEH = 0;
//
// Look at the current state of the push-button switch.
// Based on that, set the edge that we expect to see next.
if(input(PIN_B0) == 1) // If switch is high
ext_int_edge(H_TO_L); // Then expect a falling edge next
else // If switch is low
ext_int_edge(L_TO_H); // Then expect a rising edge next

clear_interrupt(INT_EXT);
enable_interrupts(INT_EXT);
delay_ms(10);

EnterDeepSleep() ;

printf("Should never get here\n\r");

while(true)
{

}

}

However, PIC does not go back to sleep when I try to perform a task.

With a simple test task (if function commented in above code), when interrupt fires, I am turning a LED on. The problem is , LED does not turn back to off afterwards, meaning that PIC is not getting back to deep sleep mode.

in my complete design I will keep real time while in deep sleep , than wake up only to save the date and time to an external EEPROM when interrupt fires and go back to sleep. I have written and tested the other parts of the code and they are working. But I want PIC to be awake only while performing a task and than go back to sleep again.

Something is still wrong, I tried to add the if function to various places in the code flow and it still not working.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Wed Jun 08, 2011 12:25 pm

I assume that setting pin A1 to high level turns the LED on. I don't see
any place in your code where you turn the LED off. You never set pin A1
to a low level.

Going into Deep Sleep mode doesn't turn it off. Read the data sheet:

Quote:

4.6.2 I/O PINS DURING DEEP SLEEP
During Deep Sleep, the general purpose I/O pins will retain their previous states.

Download the PIC data sheet and read the whole section on Deep Sleep.

heUAcyp

Joined: 16 Mar 2011
Posts: 33


Posted: Wed Jun 08, 2011 2:55 pm

Thank you boss

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