Dear support,
I am experiencing an issue while using the SPIS peripheral. The issue seems to be the same one as https://devzone.nordicsemi.com/f/nordic-q-a/33727/new-in-nrf52-spi-slave-clock-out-def-as-first-byte-on-miso but that issue was never resolved so I am opening a new question.
The scenario:
1. nRF52832 as SPI slave other micro controller as SPI master. nrfx_spis_init is called with the appropriate config for the HW. The DEF byte is set to 0xDE.
2. The slave side uses nrfx_spis_buffers_set to prepare to send 46 bytes over SPI and a NULL pointer for the received data (the master is not actively sending data, it just wants to read from the slave). The buffer to send starts with 0x42, the other 45 bytes are 0.
3. The master pulls the CS low and tries to read the 46 bytes. By stepping though the code I could confirm that the semaphore was released by the cpu long before the CS low event happened.
4. The master receives 0xDE, 0x42 and then 44 0x00 bytes. The event_handler passed to nrfx_spis_init is called on the slave side but indicates that only 45 bytes were transmitted.
I can also see this on the logic analyzer:
I have tried this with the workaround for errata 109 enabled and disabled and can see no difference.
Best regards,
Sam.
