Arduino Mega2560 and GetADC() with Channel 8 to 15

Micha · Joined: 03 Oct 2006 Posts: 57

Hello

I use BascomAVR in Version 2.0.7.8 (Fullversion).
Now I testing Arduino Mega2560 Board with bascom and have found out a misstake about GetADC.

In Bascom-Help is written to use the Command GetADC(0,32) then read ADC on channel 8.
The Value 32 is the Offset for channel 8 an Single-End ADC.

But this Command does not work. Only GetADC(32) read the ADC in Single-End Mode.

Could it be that there is the help not correct?
Or does the Command GetADC(Channel,[Offset]) not work?

The Command GetADC(channel,Offset) does not set the MUX-Bit 5 in ADCSRB.3.

Thanks for Info!

Micha.

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

it appears to be a bug. but i will check it. getadc() started with chips that had only 8 channels. later other options were added like with the offset. but the offset was too hard to use for some. so later an option was added to use one channel parameter for all modes. so without checking, i think they both work. i did look and see you get different result indeed. so i will check it. could be a problem in the dat file too.

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

i checked it and it is indeed a bug. you get it for normal AVR when using the offset with numeric values when the mux5 bit must be set (m1280,m2560). i changed it.