LPSPI: Reading RX in continous transfer

martinhoffmann2 — Tue, 06 Feb 2018 08:31:32 GMT

Hi!

Following the example on AN5320 https://www.nxp.com/doc/AN5320

I want to send multiple 8 bit frames in continous mode.

Sending works fine, but the Application Note does not describe how to correctly read back the received bytes after each single transmission.

Is there any detailed description available how to handle the received bytes (which flags to poll/clear, etc.)

Thanks in advance!

-Martin

Re: LPSPI: Reading RX in continous transfer

danielmartynek — Wed, 14 Feb 2018 14:25:16 GMT

Hi,

You need to poll SR[RDF] bit which is set and clear depending on the number of words in the receive FIFO, configurable in FCR[RXWATER].

Regards,

Daniel