Interrupt for every byte receive from spis

[konsang]

Hi,

Does the SPIS generate interrupt for every byte of data receive ?

What kind of interrupt of event that SPIS will generate for data received ?

Please advise

[Susheel Nuguru]

Hi,

Yes, you can set the MAXRX to 1 and enable the interrupt that can be triggered for ENDRX event. Then you will get an interrupt for every byte received .

[konsang]

Hi, 

If what is the maximum delay to trigger interrupt once byte of data is received ?

Please advise.

Thanks.

Br,

KonSang

[Turbo J]

Worst case interrupt latency has to include softdevice interrupts. That would put a usable SCK frequency down to somewhere in the single-digit kHz range.

You rather want to use a maximum size RX buffer for EasyDMA and use the RXD.AMOUNT register to read how many bytes where sent in a frame.

[konsang]

Hi, 

I need to read the SPI data for every byte data received before the SS pin is asserted. 

I know to do this, I cannot use the driver because of semaphore safe access. But, I can force to direct access the memory without using the driver.

Can you guide me or show me an example code to do this ?

Thanks.

Br,

KonSang