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

[thesparky]

Still cannot get anything to work with this PIC18f4523.

My code is (at the moment...):

DEFINE OSC 8
OSCCON = %01110000
ADCON0 = %00000000
ADCON1 = %00001111
CMCON = %00000111
TRISE=0
TRISD=0
PORTE.0 = 1
PORTD.2 = 1

I have tried various different things all day but I still cannot get any output.

I cannot try the code Brian supplied as it was for a different PIC (well, I did try it but it did not compile with the @__... lines in place, once I'd rem'd them out it programmed fine but still did not work). I can't use a 18F2320 as this has not got enough pins for the final project I want to use this pic for, and ideally I would like at least 1 12 bit adc, preferably 2.

[mackrackit]

did not compile with the @__... lines in place,

What exactly happened?

To set the configs in code space
http://www.picbasic.co.uk/forum/showthread.php?t=543


Your are using MPASM as the assembler?.

[mark_s]

Still cannot get anything to work with this PIC18f4523.

My code is (at the moment...):

DEFINE OSC 8
OSCCON = %01110000
ADCON0 = %00000000
ADCON1 = %00001111
CMCON = %00000111
TRISE=0
TRISD=0
PORTE.0 = 1
PORTD.2 = 1

I have tried various different things all day but I still cannot get any output.

I cannot try the code Brian supplied as it was for a different PIC (well, I did try it but it did not compile with the @__... lines in place, once I'd rem'd them out it programmed fine but still did not work). I can't use a 18F2320 as this has not got enough pins for the final project I want to use this pic for, and ideally I would like at least 1 12 bit adc, preferably 2.

You also need to set adcon2 on the PIC18F4523. It might be better to try a 10 bit a to d converter first. Maybe a PIC18F452 once you get that working you move to a 12bit converter. PBP adcin command may not work since it is geared to 8 and 10bit adc's.
Good luck

Nothing like a quick search. See Bruce's example
http://www.picbasic.co.uk/forum/show...ighlight=12bit

[thesparky]

mackrackit

The compiler did not seem to like the commas.
e.g @ __CONFIG _CONFIG1H, _INTIO2_OSC_1H & _IESO_OFF_1H

I have just tried the line:
@__CONFIG_INTRC_OSC_NOCLKOUT

and it seems to compile with this. I do not know what this does and do not know if it applies to this PIC, but I was just seeing if would complie.

I am using MicroCode Studio, and when I go to View/Compile and Program Options/Compile Tab the use PBPL checkbox is ticked (although I have tried unticked) and when I go to the Assembler Tab the Use MPASM is ticked. I have not changed any of the settings (appart from PBPL) since I have been programming a 16F690 and this seems to program fine.


mark_s

I think I may be confusing the issue with the A-D convertor. I do not want any A-D stuff yet, I just want a simple?!? digital output to prove to myself that my setup works. I will look at ADCON2 now though. I tried another PIC18F4523 and this does not give me any output either. I have re-checked all the connections with a DVM and they all seem fine.


If I still have no luck over the weekend then I will buy some different pics on Monday.

[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.