topic Re: Connect bits streams at 13Mhz to GPIOs in LPC Microcontrollers

Connect bits streams at 13Mhz to GPIOs

michcor — Mon, 23 Jan 2017 23:06:14 GMT

Hello,
I have a board which have 8 x bit streams. Each bit stream has its own associated bit clock. So I have: 8 x 2pins (one for the bit stream, one for its associated bit clock). Each bit clock is at 13mhz.

I would like to connect these streams to GPIOs pins of a single Cortex-M MCU for further processing. Which LPC should I use?

Thx,
Michel

Re: Connect bits streams at 13Mhz to GPIOs

Carlos_Mendoza — Mon, 30 Jan 2017 20:42:59 GMT

Hi Michel,

Are the bit clocks going to be synchronized? or you are going to sample each stream bit separately based on its clock? I think the LPC43xx family of high performance MCUs could achieve the sample frequency you need:

LPC4300 Series: High Performance Microcontrollers (MCUs) based on ARM® Cortex®-M4/M0 Cores|NXP

Please notice that processing an interrupt takes time, it takes you 12 cycles to get into the ISR so whatever the GPIO pad is physically able to do, the determining factor is the time you spend on going into the ISR and run the ISR.

Hope it helps!

Best Regards,
Carlos Mendoza
Technical Support Engineer

Re: Connect bits streams at 13Mhz to GPIOs

michcor — Mon, 30 Jan 2017 21:49:38 GMT

Hello Carlos,

hank you for your response.

Bit clocks are not synchronized and I need to sample each stream bit separately based on its clock.

Does the LPC4300 is able to handle these streams in parallel?

thx

Regards

Michel

Re: Connect bits streams at 13Mhz to GPIOs

Carlos_Mendoza — Tue, 07 Mar 2017 22:40:16 GMT

Hi Michel,

This will depend on which other tasks are going to be executed in your program and the time it will take you to process the sampled data.

Hope it helps!

Best Regards,
Carlos Mendoza
Technical Support Engineer