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 Post subject: Code for ADC output
PostPosted: Mon Jun 18, 2012 10:49 am 
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Joined: Tue May 01, 2012 2:10 pm
Posts: 8
Location: nkana
I have made progress on hardware interface now I'm asking for assistance on coding. The ADC has a busy output which goes low when conversion is done. I need code to process this signal that indicates to the 68000 that conversion is over. Second, I want to set the timer to schedule to the selection of voltages at the multiplexer at an interval of 5 minutes. I have 10 multiplexed inputs for the two ADCs. The ADC is ZN448E and the MUX is 4051.


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PostPosted: Wed Jun 20, 2012 2:05 pm 
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Joined: Mon Jul 26, 2010 11:43 pm
Posts: 198
Location: Aurora, IL
You could wire the EOC to generate an interrupt, or buffer it so it may be read and tested.

move.b ADC_STATUS,d0
btst #0,d1
beq adceoc

or

btst.b #0,ADC_STATUS
beq adceoc

Set your timer to generate a periodic interrupt.

You'll need to own the project development. There are several books on interfacing to 68K, and micro's in general. Review code and design examples.


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