PIC18F2523 12 bit adc

[pheelius]

Is there any way of accessing the full 12 bits of the PIC18F2523's ADC, it seems to be restricted to the usual 10bits of the majority of the PICs.

[Benj]

Hello

I will look into this for you.

[Benj]

Ok I think I have fixed the problem now

Open the FCD file for the 18F2523. and edit the following line.

Code: Select all

ADCFull="short iRetVal;\niRetVal = (adresh << 2);\niRetVal += (adresl >> 6);\nreturn (iRetVal);\n"

Change it to the following

Code: Select all

ADCFull="short iRetVal;\niRetVal = (adresh << 4);\niRetVal += (adresl >> 4);\nreturn (iRetVal);\n"

Then restart Flowcode and you should now have access to all 12 ADC bits.

Note: This fix will also work for the 18F2423, 18F4423 and 18F4523

[pheelius]

i've just tried what you suggested but when I read the adc of a pic18f2523 as an integer and display it in on an lcd I still only get a 10 bit value.

[pheelius]

Found what else you need to do, at the beginning of the fcd files you also need to change the line:

ADCBits=10

to

ADCBits=12


javascript:emoticon(':D')
Very Happy

[Benj]

Hello

Thanks for that. Is it running with the proper 12 bit accuracy now.