Rc signal help

[geckogrotto]

I have read quite a bit on this and most sources point to using PulsIn.

I found some code on the web for another chip and am trying to modify it for 12F675 but am getting no love.

'12F675
@ __CONFIG _INTRC_OSC_CLKOUT & _WDT_OFF & _MCLRE_OFF & _CP_OFF
OPTION_REG.5 = 0                                                       ' clock source internal

Pulselen   var Byte                                                 ' Pulselen can be 0 - 255, 100 = 1 ms, 200 = 2 ms
Init       var Byte                                                 ' Init used to flash LED
Clear                                                                  ' set all variables = 0

Input GPIO.3                                                           ' set pin 5 to RX signal

ReadPWM:
   PulsIn GPIO.3, 1,Pulselen                 ' pin 4 - read high pulse length, times out after .65535 seconds 
   pause 15                   
   If Pulselen < 50 Then GoTo Blink           ' no signal  -> blink led
   If Pulselen > 50 Then GoTo Solid           ' signal  -> Solid led
   GoTo ReadPWM               
        
Blink: 
   For Init = 1 To 3                                                   ' blink led 3 times
      High GPIO.1                                                      
      pause 200                                                      
      Low GPIO.1                                                     
      pause 200                                                      
   Next
pause 1000		    
 GoTo ReadPWM 
 
Solid: 
      High GPIO.1                                                      
      pause 3000                                                      
      Low GPIO.1
      pause 200
 GoTo ReadPWM

It should blink when no signal and be solid when there is but it seems to do whatever it wants no matter what signal I try and send it.

Is it the config settings?

[HenrikOlsson]

Hi,
Your program jumps to the same location whatever the pulsewidth is:

ReadPWM:
   PulsIn GPIO.3, 1,Pulselen                 ' pin 4 - read high pulse length, times out after .65535 seconds 
   pause 15                   
   If Pulselen < 50 Then GoTo Blink     '<----HERE......
   If Pulselen > 50 Then GoTo Blink     '<----and HERE.....
   GoTo ReadPWM

Change the the second If statement to

If Pulselen > 50 then Goto Solid

HTH
/Henrik Olsson.

[geckogrotto]

Yea that was an accident when I retyped to simplify the code but its fixed now and still doesn't work.

I also added this
CMCON = 7 ' PortA Digital inputs

I think this chip starts as analog or something still no help.

[HenrikOlsson]

Hi,
The 'F675 has one comparator AND an A/D converter.
The comparator is turned off with CMCON=7 and the the pins for the A/D is set to digital only with ANSEL=0.

However....

You're using GP3 for your input and that pin is not connected to either the comparator or the A/D so none of the above should really matter but I'm not sure. GP3 is however the MCLR pin and it seems you have a typo in your config setting. I THINK it should be MCLR_OFF and not MCLRE_OFF. - try it.

Also, you're using a byte-size variable to store the pulsewidth, try switching that to a Word instead.

/Henrik Olsson.

[geckogrotto]

Hi,
The 'F675 has one comparator AND an A/D converter.
The comparator is turned off with CMCON=7 and the the pins for the A/D is set to digital only with ANSEL=0.

However....

You're using GP3 for your input and that pin is not connected to either the comparator or the A/D so none of the above should really matter but I'm not sure. GP3 is however the MCLR pin and it seems you have a typo in your config setting. I THINK it should be MCLR_OFF and not MCLRE_OFF. - try it.

Also, you're using a byte-size variable to store the pulsewidth, try switching that to a Word instead.

/Henrik Olsson.

I tried swapping back and forth on ANSEL and CMCON neither seem to make a difference. Also when I change to MCLR_OFF it errors and will not even compile.

I tried using word as well no luck.

[Acetronics2]

Hi, gecko

No problem compiling with MPASM 7.41 and PbP 2.46a ...

Error [ 118 ] is to forget when using @ __config

May be add END ... at the end !!!, but that's not compulsory ( good habit then ... )

Alain