Re: [ts-7000] Re:U Sleep

[Girisha De Silva <>]

Hey

Thanks Rod for your reply. Anyways this is what I do in the loop.

cur_ch = ADC_CH2;
   
        //discard two samples
        read_channel(adc_page, cur_ch);
        read_channel(adc_page, cur_ch);


        //read 1000 more samples
        for(j = 0; j < NOSAMPLE; j++)
        {
            usleep(1000);
            adc_result[j] = read_channel(adc_page, cur_ch);
   
            avg = adc_result[j];

            if(avg < 0x7000)
            avg = avg + 0x10000;

            avg = avg - 0x9E58;
            val = ((double)avg * 3.3) / 0xC350;
   
            sprintf(pBuff,"%f",val);   
            fprintf(file,"%s\n",pBuff);
   
        }

Hope I am doing it the correct way.

Regards Girisha

---

From: Rod Nussbaumer <>
To:
Sent: Sunday, February 22, 2009 1:11:06 AM
Subject: [ts-7000] Re:U Sleep

How are you reading the ADC? Most ADCs have a bit somewhere to signal
End-of-Conversion. If your loop is simply reading a register that is
supposed to contain converted data, but is not waiting for EoC, that
would explain erratic readings. If a time-delay is inserted, as with
usleep(), it would allow time for the conversion to complete, and
provide you with valid readings. Again, this is consistent with the
behavior you are seeing. Can you confirm that you are reading the ADC in
a way that assures it has completed a conversion?
--- rod.

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