LPC54018 ADC Sampling rate modification issue

Gopalvishwakarma — Tue, 15 Dec 2020 05:05:23 GMT

Hi there,

This is a beginner question.

I am trying to configure the ADC at as low as 1000 samples/sec (I am OK with 5ksamples/sec too). I changed kADC_ClockSynchronousMode and

kADC_ClockAsynchronousMode mode. however, I could not get grasp on it. I see same sampling rate. I tried changing values of clockDividerNumber, sampleTimeNumber, ADC_CTRL_TSAMP_MASK,ADC_CTRL_ASYNMODE_MASK,ADC_CTRL_RESOL_MASK. Still I see no change in sampling rate. I see same values at MCUexpresso console. Is there any other way that I can see actual sampling rate? Previously I thought different console speed of USB shows less no. of ADC result values then I tried watching memory. I observed same no. of values over there.

Kindly guide me. or small sample code will be helpful. Many thanks,

Gopal

Re: LPC54018 ADC Sampling rate modification issue

ZhangJennie — Fri, 18 Dec 2020 14:08:14 GMT

I suggest you config ADC setting with config tool rather than modify code directly. If use ADC clock from syscon. config it as below.

Hope this helps,

Jun Zhang

topic LPC54018 ADC Sampling rate modification issue in LPC Microcontrollers

LPC54018 ADC Sampling rate modification issue

Re: LPC54018 ADC Sampling rate modification issue