18F4523 beginner needing help to blink an LED...

[mackrackit]

No AD?
Take a look at this.
http://www.picbasic.co.uk/forum/cont...54-All-Digital

[thesparky]

I looked into ALL DIGITAL and thought it would be the answer to all my prayers...

My Code is now as follows:

INCLUDE "ALLDIGITAL.pbp"
define SHOWDIGITAL 1
Main:
TOGGLE PORTE.0
PAUSE 1000
GOTO Main


Unfortunately I still cannot get any outputs.

When compiled I get the following messages in the results window:
ADCON1 = 0x0F
CMCON = 7

I have rechecked my software and hardware by programming another Pic, a 16F690, and this programs fine.

I am beginnig to think I may have a dodgy couple of IC's. I'll try and build another board up next Monday to rule out this, although I can program and read the pic with the setup I have now.

Any other things I can try?

[mackrackit]

I do not have this chip but give this a shot

'18F4523 INTERNAL OSC 8MHZ Internal oscillator block, port function on RA6 and RA7	
@ __CONFIG    _CONFIG1H, _OSC_INTIO67_1H  & _FCMEN_OFF_1H & _IESO_OFF_1H
@ __CONFIG    _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
@ __CONFIG    _CONFIG3H, _CCP2MX_PORTC_3H & _PBADEN_OFF_3H & _LPT1OSC_OFF_3H & _MCLRE_ON_3H
@ __CONFIG    _CONFIG4L,  _STVREN_ON_4L & _LVP_OFF_4L & _XINST_OFF_4L
DEFINE OSC 8
OSCCON = %01110000
ADCON1 = %00001111  
CMCON = 7

Main:
TOGGLE PORTE.0
PAUSE 1000
GOTO Main

[cncmachineguy]

FWIW, Dave your code works in sim, (I don't have that PIC either). 2 things I had to do: comment the configs cuz I was too lazy to go fix the .INC, and I had to tie MCLR high. So question for OP, Do you have MCLR enabled AND tied high? I ask because it's an easy to miss thing.

[mackrackit]

I think the configs are the key here if the OP wants to use the internal OSC.

[cncmachineguy]

Well I must admit, being new to proteus, blinking that LED was like I had done it with my first PIC!! I was thinking about MCLR since I assume when I commented the configs it used the PBP default's.

[mackrackit]

I may have to try a sim again, when I tried it a few years ago... well it just plan was not worth the effort.

The PBP inc configs for this chip are HS on the OSC.

Does your sim have a resonator or something attached?

And you may have hit it about MCLR.