What is the reference voltage selected for ADC polling example application adc_12b1msps_sar_polling in IMXRT1050 SDK ?

[abhiram_d]

Going through the application code for #adc_12b1msps_sar_polling for imxrt1050-evkb, I was puzzled by the config for ADC.

     *  config->enableAsynchronousClockOutput = true;
     *  config->enableOverWrite =               false;
     *  config->enableContinuousConversion =    false;
     *  config->enableHighSpeed =               false;
     *  config->enableLowPower =                false;
     *  config->enableLongSample =              false;
     *  config->referenceVoltageSource =        kADC_ReferenceVoltageSourceVref;
     *  config->samplePeriodMode =              kADC_SamplePeriod2or12Clocks;
     *  config->clockSource =                   kADC_ClockSourceAD;
     *  config->clockDriver =                   kADC_ClockDriver1;
     *  config->resolution =                    kADC_Resolution12Bit;

Reference voltage source is selected as kADC_ReferenceVoltageSourceVref. Where can I find more info on this ?

Also I'd be grateful if someone could explain the reasons for choosing these config parameters.

[jingpan]

Hi Abhiram,

Unlike other kinetis MCU, RT1050 only has Vrefh and Vrefl as reference voltage, no alternate. But the driver is share with kinetis device. So, kADC_ReferenceVoltageSourceVref because the only option. The information of reference voltage is in reference manual chapter 64.

Regards,

Jing