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How do you set and read ADC/DAC pin values? — Parallax Forums

How do you set and read ADC/DAC pin values?

pedwardpedward Posts: 1,642
edited 2013-03-22 02:58 in Propeller 2
I must be missing something, but I don't see how you set the DAC value or read the ADC value from pins.

Anyone know the answer?

Comments

  • pedwardpedward Posts: 1,642
    edited 2013-03-22 01:33
    Heyyy, I found some instructions:

    SETDACn for DAC output, there are 4 per COG.
  • pedwardpedward Posts: 1,642
    edited 2013-03-22 01:37
    I don't see any instructions for ADCs, but I'd guess there are 4 registers per COG as well...
  • TubularTubular Posts: 4,726
    edited 2013-03-22 01:49
    cfgpins... it has a mask to choose what pins you want to change, and options to choose a wide variety of modes including current source,pullup/down,etc
  • AribaAriba Posts: 2,690
    edited 2013-03-22 02:58
    pedward wrote: »
    I don't see any instructions for ADCs, but I'd guess there are 4 registers per COG as well...

    I think ADCs are still done per Sigma-Delta modes of the counters, only the feedback and input resistors are now internally available for every pin.

    EDIT: after looking into the Docs, it is more like that:
    The pins implement a Sigma-Delta modulator (Comparator, Latch, Feedback filter) if you configure them so. They send then a bitstream of 0/1 according the input voltage.
    To get an ADC value from that you need a counter that counts the ones over a certain period.

    Andy
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