Permanent sleep

[Melanie]

Permanent Sleep eh?.... Well apart from a Sledge Hammer... try...

@ SLEEP

The PIC will sleep PERMANENTLY until woken by an interrupt event... this does not mean you have to embed Assembler interrupts or the like, execution of the program 'should' continue from the next instruction when the PIC is woken from it's slumber.

For example this snippet of code shows (for a 16F628) what Registers you need to set in order to trigger a wake event...

	'
	'	PIC Low-Power Sleep Routine
	'	---------------------------
		'
		'	Set Sleep Interrupts
		'	--------------------
	INTCON=%00011000	' Interrupt Control Register
				'    7=0 - GIE  - Global Interrupt Enable
				'    6=0 - PEIE - Peripheral Interrupt Enable
				'    5=0 - TOIE - TMR0 Overflow Interrupt Enable
                                '    4=1 - INTE - RB0/INT Enable
				'    3=1 - RBIE - PORTB change interrupt Enable
				'    2=0 - TOIF - TMR0 Overflow Flag
				'    1-0 - INTF - RB0/Ext Interrupt Flag
				'    0=0 - RBIF - PORTB Interrupt Flag
	OPTION_REG.6=1		' 1=RB0 Rising-Edge Trigger, 0=Falling-Edge Trigger
		'
		'	Reset Interrupt Flags
		'	---------------------
	INTCON.1=0		' Reset RB0 Flag
	INTCON.0=0		' Reset PORTB change Flag
		'
		'	Sleep
		'	-----
	@ SLEEP
	Pause 100		' Needed for system Wake-Up

You can see that I'm setting a wake-up call using either RB0 or PortB inputs. The Pause can be omitted, but works for me, so that the PIC can have a stretch, yawn, light-up a cigarette etc...

[charudatt]

Hello Mel,

I am trying to get this sleep comand to work and it simply does not work.

my code:
@ DEVICE PIC16F628A, INTRC_OSC_NOCLKOUT, WDT_OFF, LVP_OFF, PWRT_OFF, PROTECT_OFF, BOD_OFF
CMCON=7
VRCON=%01101100 'VRCON bit7 is OFF for no current drain
OPTION_REG.7 = 0 ' ENABLE INTERNAL PULLUPS
Trisa = %01111111
Trisb = %11111111
LED VAR PORTA.7

'
' PIC Low-Power Sleep Routine
' ---------------------------
'
' Set Sleep Interrupts
' --------------------
INTCON=%00011000 ' Interrupt Control Register
' 7=0 - GIE - Global Interrupt Enable
' 6=0 - PEIE - Peripheral Interrupt Enable
' 5=0 - TOIE - TMR0 Overflow Interrupt Enable
' 4=1 - INTE - RB0/INT Enable
' 3=1 - RBIE - PORTB change interrupt Enable
' 2=0 - TOIF - TMR0 Overflow Flag
' 1-0 - INTF - RB0/Ext Interrupt Flag
' 0=0 - RBIF - PORTB Interrupt Flag
OPTION_REG.6=1 ' 1=RB0 Rising-Edge Trigger, 0=Falling-Edge Trigger

CYCLE:
'
' Reset Interrupt Flags
' ---------------------
INTCON.1=0 ' Reset RB0 Flag
INTCON.0=0 ' Reset PORTB change Flag
'
' Sleep
' -----
LOW LED
@ SLEEP
@ nop
@ nop
@ nop
@ nop

Pause 100 ' Needed for system Wake-Up
HIGH LED : PAUSE 200 : LOW LED
GOTO CYCLE

Maybe I could be missing some thing. The LED just keeps blinking.

Basically I am trying to incorporate this in a garage code lock project.

any help ?

[Acetronics2]

' Set Sleep Interrupts
' --------------------
INTCON=%00011000 ' Interrupt Control Register
' 7=0 - GIE - Global Interrupt Enable
' 6=0 - PEIE - Peripheral Interrupt Enable
' 5=0 - TOIE - TMR0 Overflow Interrupt Enable
' 4=1 - INTE - RB0/INT Enable
' 3=1 - RBIE - PORTB change interrupt Enable
' 2=0 - TOIF - TMR0 Overflow Flag
' 1-0 - INTF - RB0/Ext Interrupt Flag
' 0=0 - RBIF - PORTB Interrupt Flag
OPTION_REG.6=1 ' 1=RB0 Rising-Edge Trigger, 0=Falling-Edge Trigger

?

Hi, Charudatt

May be you could simply enable the interrupts before sleeping ... might work better.

Yess GIE = 1 ... ( INTCON.7 = 1 )



oh, oh ... you are still asleep ???

Alain

[Melanie]

You are obviously being woken from Sleep, so find out what is causing it...

...and ground all the INPUT pins on PortB in case one is floating.

[Acetronics2]

Heuuu

No GIE = No Sleep ( RTFDatasheet ... $ 14.8.1 - Greyed Note ), so we set GIE Bit

Then ... Executes the 1St NOP

Then ... Branches to location 0004 ...

But there is a supposed Interrupt stubb here instead of falling into the "program" ...

a single " DEFINE INTHAND INIT " without any interrupt stubb ( LOL ! ) would push the libs away from the 4 first program locations ... and allow restarting the PIC as a first power up ...

We could also Branch to the "Pause 100" ... to have some visual effect before re-entering sleep ... ( wich is better ...I think)

Sooo ...

we add :

DEFINE INTHAND _BLINK ' near top of program

and

BLINK:

Before

Pause 100 ' Needed for system Wake-Up
HIGH LED : PAUSE 200 : LOW LED
GOTO CYCLE




I am right, Mel ???

Alain

PS: We are aboard PBC list ... what about interrupts in PBC ???

[T.Jackson]

"Super Acetronics" - I think he might be right. He should change his name to Supertronics

[Acetronics2]

Hehe, Trend ...

You did not know about the Underscored Inthand name ... I presume.

Permits LOTS of good things, especially if context must not be saved ( what is lots of encountered situations ...).

Also REALLY Instant Basic Pseudo-Interrupts !!! ( The return adress MUST be explicitly given )

Alain

[Ron Marcus]

Heuuu

No GIE = No Sleep ( RTFDatasheet ... $ 14.8.1 - Greyed Note ), so we set GIE Bit

Then ... Executes the 1St NOP

Then ... Branches to location 0004 ...

But there is a supposed Interrupt stubb here instead of falling into the "program" ...

a single " DEFINE INTHAND INIT " without any interrupt stubb ( LOL ! ) would push the libs away from the 4 first program locations ... and allow restarting the PIC as a first power up ...

We could also Branch to the "Pause 100" ... to have some visual effect before re-entering sleep ... ( wich is better ...I think)

Sooo ...

we add :

DEFINE INTHAND _BLINK ' near top of program

and

BLINK:

Before

Pause 100 ' Needed for system Wake-Up
HIGH LED : PAUSE 200 : LOW LED
GOTO CYCLE




I am right, Mel ???

Alain

I am using the '690. In that FM, the processor will still wake from sleep if the flag is set without the GIE set. With the GIE set you have to service the interrupt. Without, it starts up right after the sleep command.

Ron

[Acetronics2]

Hi Ron,

You're perfectly right with the '690 ... but, care ... GIE settings do not have the same effects for the '628 ... and GIE *must* be set to enter sleep ( sleep ignored if GIE = 0 ) .

Alain

[charudatt]

Hello Ron and Other,

I did not understand the Int_handler part. You mean to say , declare a Int_handler without a lable and make the pic reset.

Well setting GIE made it to go to sleep (LED not blinking but current 6mA) but did not come out of it.

any further help?

regards

[savnik]

Hello Mel,

I am trying to get this sleep comand to work and it simply does not work.

my code:
@ DEVICE PIC16F628A, INTRC_OSC_NOCLKOUT, WDT_OFF, LVP_OFF, PWRT_OFF, PROTECT_OFF, BOD_OFF
CMCON=7
VRCON=%01101100 'VRCON bit7 is OFF for no current drain
OPTION_REG.7 = 0 ' ENABLE INTERNAL PULLUPS
Trisa = %01111111
Trisb = %11111111
LED VAR PORTA.7

'
' PIC Low-Power Sleep Routine
' ---------------------------
'
' Set Sleep Interrupts
' --------------------
INTCON=%00011000 ' Interrupt Control Register
' 7=0 - GIE - Global Interrupt Enable
' 6=0 - PEIE - Peripheral Interrupt Enable
' 5=0 - TOIE - TMR0 Overflow Interrupt Enable
' 4=1 - INTE - RB0/INT Enable
' 3=1 - RBIE - PORTB change interrupt Enable
' 2=0 - TOIF - TMR0 Overflow Flag
' 1-0 - INTF - RB0/Ext Interrupt Flag
' 0=0 - RBIF - PORTB Interrupt Flag
OPTION_REG.6=1 ' 1=RB0 Rising-Edge Trigger, 0=Falling-Edge Trigger

CYCLE:
'
' Reset Interrupt Flags
' ---------------------
INTCON.1=0 ' Reset RB0 Flag
INTCON.0=0 ' Reset PORTB change Flag
'
' Sleep
' -----
LOW LED
@ SLEEP
@ nop
@ nop
@ nop
@ nop

Pause 100 ' Needed for system Wake-Up
HIGH LED : PAUSE 200 : LOW LED
GOTO CYCLE

Maybe I could be missing some thing. The LED just keeps blinking.

Basically I am trying to incorporate this in a garage code lock project.

any help ?

Change the
OPTION_REG.7 = 0 ' ENABLE INTERNAL PULLUPS
to
OPTION_REG.7 = 1 ' DISABLE INTERNAL PULLUPS