Re: [Gumstix-users] output to text file, ADC use, beginner questions

[Dave H. <dhy...@gm...>]

HI Eli,

> question two is about the  AD ports... to get data from them, is there
> anything special I have to do? i tried just including a2d.h and then trying
> out "a2d_8(X)" where X is whatever port I was trying to access, but it didnt
> seem to be behaving correctly. do I have to set up the AD ports for input or
> output in some way? I know its a very basic question but any help would be
> appreciated.

The ADC ports need to be configured properly.

If you look in the Flash-LED project, you'll see a Hardware.c file and
Hardware.h file. There is a section in the InitHardware function which
initializes the ADC, using some constants from Hardware.h.

You should also consult the ATmega128 datasheet. There is a fairly
large section on using the ADC.

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.DaveHylands.com/