SDK 11 SPI Slave register return wrong tx value when buffer set to 0

[utrank00]

Hi,

If I set the tx buffer to 0 before and transaction, I expect the spi slave register's AMOUNTTX to be 0 when the transfer complete. But intstead, the AMOUNTTX always equal the the AMOUNTRX when the transfer complete. This an expected behavior or it's a bug?

Thanks, Kevin.

[Jimmie Johansson]

I know this is an old question, but it was the first result when I was searching so I decided to add an answer. It has kind of been answered before:

(https://devzone.nordicsemi.com/question/14942/spis-orc-register-not-being-used/).

It is a bug and it is documented in PAN74. The workaround is to set a 1 byte buffer with the ORC character.