Is it possible to operate SPI slave in a way DMA generates END event when given number of bytes is transferred ?

[maki]

In my case active CE signal defines byte boundaries - for each byte individually.
From what I see, DMA seems to stop on rising edge of CS regardless what is declared in MAXTX, MAXRX. So assuming that semaphore is in a SPI state, start of DMA transaction is determined by falling edge of CS and end of DMA transaction is determined by rising edge of CS.

[Stefan Birnir Sverrisson]

Hi

I do not think it is possible with the standard SPI driver to get an event on the SPI slave side when a certain amount of bytes have been transferred. However, the SPI slave can signal the master to stop the transaction by setting the CS line high. For that purpose, you may want to look into the SPI raw and SPI 5W raw protocols