SPI Master Communication with SPI Slave(TW8035 IR Camera) have problem.

[IAMLIUBO]

Hi everyone:
In the few days,I working onthe SPI commuication with ESP32.But I have a problem.I refer to the manual to send it a test package，but my SPI Slave device(TW8035 IR Camera) didn't response any data.I have no ideas with this problem.





One of the things I don't quite understand is DUMMY data in the third picture.
This dummy data is similar with the Fourth picture dummy_bits?



The test protocol package like the below picture.



But I can't upload the code right now,it's not on this PC.
Can someone give me some advice?


Thanks!
IAMLIUBO

[Sprite]

You probably can't use the 'dummy bits' feature here, as the 'command' is more than the ESP32 can send as a dedicated command. Suggest you just send 17 bytes of data as a normal data payload, with the first 9 containing the command.

[IAMLIUBO]

You probably can't use the 'dummy bits' feature here, as the 'command' is more than the ESP32 can send as a dedicated command. Suggest you just send 17 bytes of data as a normal data payload, with the first 9 containing the command.

Thanks for reply.I open an issues at the Github.The engineer of espressif help me for this problem right now.

https://github.com/espressif/esp-idf/issues/3699

Thanks!
IAMLIUBO