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┬ÁTasker Forum => FreescaleTM MC9S12NE64 => Topic started by: Marco on February 16, 2009, 04:53:22 PM

Title: Reading Analog to Digital Port
Post by: Marco on February 16, 2009, 04:53:22 PM
Hi

I'm trying to figure out how to read analogue on the PAD on the MC9S12NE64, can someone please point me in the right direction?

Cheers

Marco
Title: Re: Reading Analog to Digital Port
Post by: mark on February 18, 2009, 02:45:02 PM
Hi Marco

Here is a very old file which was used once to trigger sending Emails when ADC inputs measured values lower or higher than defined levels.
I haven't use this in a long time but at least you will see how to configure and read the ADC inputs on the NE64.

Regards

Mark
Title: Re: Reading Analog to Digital Port
Post by: Marco on February 24, 2009, 01:41:32 PM
Thanks Mark, that really put me on the right track.  I setup the port up so that it scans continiously, and set it to multi-channel Mode.

Code: [Select]
    static int State = 0;

    if(State==0)
    {
      ATDCTL3 = 0;       // Read all 8 Channels
      ATDCTL4 = 0xf3;    // 8 bit mode suitable for our bus speed
      ATDCTL2 = ADPU;    // power up the ADC
      ATDCTL5 = 0x30;       // Multi-Channel, Scan Mode
      State = 1;
    }

I just inserted this inside a looping function, and it only runs once.

Because the ADC scans continiously, I can just use ATDDR0H~ATDDR7H to aquire the ADC values.  I have tested all the ATD ports symoultaniously on the NeCore12Board, and it seems to work quite well.