I traced the SPI between the RF receiver (AMD A7125) and the MCU. It seems that a datachunk is 19 bytes and every 2 chunk is equal.
I expected that only one byte (or bit) is changed, when I press a button (f.e. X) – but there are several bytes changed in the chunk.
I assumed the following SPI parameters:
– CPOL 0
– CHPA 1
– 8 bit
– MSB first
Have anyone this protocol/communication decoded? 🙂