topic Re: Looking for an efficient way to sample a digital signal in LPC Microcontrollers

Looking for an efficient way to sample a digital signal

christian_oster — Fri, 24 Nov 2017 13:20:20 GMT

Hello,

i would like to sample a digital signal (HIGH / LOW) with a sampling rate of >=250kHz. Polling the data using a periodic timer interrupt seems like an inefficient way.

Can you recommend me a hardware component to sample digital data ? Maybe the SSP-Unit can be used for this ?

Thanks.

Re: Looking for an efficient way to sample a digital signal

kerryzhou — Fri, 01 Dec 2017 05:25:58 GMT

Hi Christian Ostermeier,

Do you want to sample the digital signal's frequency? If yes, you can use the Timer module, the capture function.

If you don't want to capture the frequency, please tell me the detail function you want to realize.

Have a great day,
TIC

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Re: Looking for an efficient way to sample a digital signal

chrispflieger — Fri, 01 Dec 2017 16:37:28 GMT

You could use the SSP if you ran it in master mode with the pin tied to MISO, but you'd have to make sure it would run without any gaps between data. However, I would consider this method unreliable.

Otherwise, timer capture is the way to go.