Digital signal input 5Mhz reading

[Simon Feutrier]

Hello,

I have a component (AMC1306) in which I input a signal of at least 5Mhz. When this signal is triggered to this component, it sends me back data at this same speed. This signal is a digital signal of "1" and "0" bits.

So I have to get all of this bits to do some analysis and store information on my device. I have tested with gpiote interruption, timer interruption or even directly in pwm interruption. In the final firmware there will be also BLE.

What is the more efficent way to do it ? Any information is interesting 

I'm using the nrf SDK v17.0 (not the NCS !)

Simon

[Dmitry]

Hi Simon,

try to use SPIM running at 8 MHz for your case (CLKIN to SCK, DOUT to MISO). With active BLE link, an interrupt from SPIM may be blocked by SoftDevice ISR for up to 250 us, so ensure your buffers are long enough.

[Simon Feutrier]

Hi Dmitry ,

Thank you for this great idea! It works perfectly. Plus SPIM use EasyDMA so that a good bonus.