Arduino Uno can't read ADC6 & ADC7 analog pins

[Alex]

Hi!

I'm Trying to use the awesome Mozzi library with a custom atmega328 based board that has access to the extra ADC6 & ADC7 pins only available on the SMD version of the atmega328.

The are normally readable via analogRead(A6) and analogRead(A7). Unfortunately mozziAnalogRead(A6) and mozziAnalogRead(A7) doesn't appear to return usable results.

I'm guessing a tweak is needed in the library to read these "special" pins.

Any guidance would be greatly appreciated!!!

Thanks in advance

Alex

[Tim Barrass]

Hi Alex,

I expect it's to do with adcPinToChannelNum() in mozzi_analog.cpp, which calls Arduino's analogPinToChannel().

You might find something out by searching the Arduino source for analogPinToChannel.

Let us know how how you go... it's probably worth incorporating/fixing.

Tim

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[Alex]

HI Tim

Thanks for the response, I had a look but it seems a little over my head, I'll see if I can "hack them in" by changing the admux registers
http://openenergymonitor.blogspot.fr/2012/08/low-level-adc-control-admux.html

Fun stuff :)

Cheers

Alex