Do PICs goto sleep?

**Ingvar** · - 27th October 2005, 13:16

I've never heard of any PICs going to sleep without beeing told so(they're just like kids

... and me), however i've never used this particular one. My guess is that your RF module gives out combinations that won't get caught by your SELECT CASE statement(0,3,5,6,7). Easily checked by adding CASE ELSE

/Ingvar

**Tissy** · - 27th October 2005, 13:29

Its not the RF module as the program works fine for the first minute or so.

Also, all the hybrid RF module does is output a HIGH or a LOW on three ports which are fed into the PIC. So all the PIC is reading is a 1 or a 0.

Any other suggestions,

Steve

J_Brittian · - 27th October 2005, 14:15

Is MaskSwitch ending up outside your parameters? What happens if you add a case else statement?

**Tissy** · - 27th October 2005, 14:29

Hmm, got me thinking now.

If i only wanted to look at RC0 , RC1 & RC2, i have now changed the TRISC to read:

Code:

TRISC = %00000111	' Set PORTC (0-2 input) rest Outputs

Is this correct?

Also, would any change need to be done for this line? What does the $07 mean?

Code:

MaskSwitch=PORTC & $07

What would you suggest i put in the CASE ELSE statement. A return back to Main? It may be worth puttin in this statement to capture any other event.

Thank you.

J_Brittian · - 27th October 2005, 14:38

Actually I was going to suggest an output of some kind, maybe an led. If MaskSwitch gets outside of your parameters in someway you could effectively end up in a main ... goto main loop.

**Tissy** · - 27th October 2005, 14:49

OK, I've added the following

Code:

Main:
    MaskSwitch=PORTC & $07
        Select Case MaskSwitch
          Case 1 '%00000001 or SW1
            Gosub Procedure_SW1

          Case 2 '%00000010 or SW2
            Gosub Procedure_SW2

          Case 4 '%00000100 or SW3
            Gosub Procedure_SW3
          Case Else
            Gosub Error
    End Select
Goto Main

Error:
    For loop = 1 to 5
        Red = 1
        Pause 100
        Red = 0
        Pause 100
    Next Loop
Return

Now the LED is flashing all the time, so i presume the CASE ELSE is true, which i guess means something else is happening.

I think it may be due to the following:

Code:

MaskSwitch=PORTC & $07

What does the $07 represent. Is this saying all of the PORTS on C. If so, what will it be if i want just PORTC.0, PORTC.1 and PORTC.2.

Thank you, i think i'm getting there!!

**Dwayne** · - 27th October 2005, 14:50

I agree with IngVar,

You have no way of knowing if the case statement is something other than 1,2,4. Put a default case in there with a blinking light....If that blinking light comes on... there is your problem.

Dwayne

**Tissy** · - 27th October 2005, 14:55

Dwayne,

Is what i've done above your posting wrong then? If so, could you post the modification to the code you are suggesting.

Many thanks.

J_Brittian · - 27th October 2005, 14:56

$07 = %00000111

Steve,
If you push two buttons at the same time or if you're not using pull down/up resistors you end up with MaskSwitch = %00000110 which isn't an option.

**Tissy** · - 27th October 2005, 15:06

Bugger, i think it might be due to no pull-down resistors.

I've attahced my circuit, would this be the case?

What values are recommended ?

Hopefully that is the problem which is reasonably easy to fix.

Regards,

Steve