AD on AN3 and AN4 not working PIC18F87J50

[faveremario]

Hi all
I'm working on a home domotic system and as a part of this project, I'm measuring 5 analog values. Doing this with a voltage divider & a stabilizing capacitor on the ANx-input. Quit forward.

For testing purposes I attached 5x 1k-thermistors and used the thermistor component in FC8. Reading every input as real temperature & sending it over USB-port to the PC where I display the values in a terminal window.
All works fine, but readings on AN3 & 4 are not correct. AN4 is connected to a 1k-thermistor on the PCB (monitoring the temperature inside the case - just in case ).

I measured the voltage across the input pin and it's OK, so it has to be a software failure.
So I updated FC8 & used the AD-component in stead of the termistor-sensor, but without success.

Did anyone had the same issues ?


Capture.png = part of the schematic & terminal readings.
FC-program : reading T & sending over USB-serial. I'm using a bootloader.

[LeighM]

Could you please try the attached, to go into
C:\ProgramData\MatrixTSL\FlowcodeV8\CAL\PIC
Thanks

[Benj]

Also available now via the v8 update system.

[faveremario]

Hi Leigh
Thanks for the quick reply!

Sure something has changed. All temperature-readings show 125° so I guess the ADC reads 1024 for all channels.

[faveremario]

I looked @the file you send me (thank you for that btw)

On line 3311, I see :

ANCON0 = ~0x01;

shouldn't is be

ANCON0 &= 0xFE;

to set PCFG0 to 0 ?
?

The image joined, shows the result. I try this out for the other channels & get back as soon as I can.
Thanks for the support.

[faveremario]

With this file it works as a dream - I modified the channel-selector as described above.

@Ben, could you place this file for the FC8-update please ?

Thanks all !

[LeighM]

Thanks for the contribution, I have pushed this into our repo, Ben will process this into the auto update system in due course