maximum input frequency on GPIO port of nRF52840

[manoj008]

Hi,

What is the maximum frequency that i can capture on GPIO port of nRF52840 ?

I'm planning to capture a frequency of 32MHz from a sensor on GPIO pin , can I do this ?

Thanks,

[awneil]

What, exactly, do you mean by "capture" ?

[manoj008]

I mean ,i want to sample a clock of max 32MHz on GPIO pin . Is it possible ?

[awneil]

That's not much clearer!

If you actually want to do any processing of that, then the CPU speed is going to be a (the?) limiting factor ...

[ps_anu]

Hi, manoj 

can you explain me your task , what actually you want to do ?

Best Regards ,

pavi

[awneil]

ps_anu said:

explain me your task , what actually you want to do

+1

http://www.catb.org/esr/faqs/smart-questions.html#goal

[manoj008]

Hi pspavi,

actually i want to interface a CAMERA module with nRF52840 with DVP  interface ,  and the  maximum pixel clock the camera provides is of  32MHz . So ,is this interface possible ?

If not , what is the maximum frequency which can be given as a input on gpio pin.

How many cycles will CPU take  to read this input frequency ? What is the maximum clock for sysytem as well as GPIO peripheral ?

Thanks

[manoj008]

hi

did u get my cocnern ?

[awneil]

Have you studied the Product Specification?

I think you're going to need dedicated hardware to do that - I don't think you'll be able to bit-bang it.

Also remember that the key focus o BLE, as the name suggests, is low energy - not high speed nor large volumes of data.

But have you looked at this:

https://github.com/NordicPlayground/nrf52-ble-image-transfer-demo

[manoj008]

ok , thank you !

but can you pls tell me what is the maximum frequency that i can take as input from camera module on gpio as i can vary my pixel clock from camera module ?

[awneil]

I'd just have to look it up in the Product Specification.