Is it possible to ignore first incoming bytes of a SPI transfer?

[Torsten Robitzki]

Hello,

given that I trigger several SPI transfers using a DPPI. TXD.PTR and TXP.MAXCNT is set to a fixed buffer, that contains a read request to a SPI slave. The slave clocks out the requested data _after_ the read request was received. The receiving easyDMA channel is configured in LIST mode. This allows me to trigger the configured SPI transfer multiple times without CPU interaction. However, on the receiving side, I receive unnecessary data during the time, the read request is transmitted. Is there a way to ignore that data on the receiving side? 

DCXCNT would be exactly, what I'm looking for, if the peripheral would ignore the configured amount of command data on the receiving side.

best regards

Torsten

[Jørgen Holmefjord]

Hi,

From a HW point of view, it is not possible to ignore incoming data. The RX buffer will be filled with data while TX data is clocked out. You need to increase the buffer size to account for this, and ignore the first bytes in your application.

Best regards,
Jørgen

[Torsten Robitzki]

Hi,

thanks for the reply. Maybe, you can you turn my question into a feature request ;-)

best regards

Torsten