Thank you for the analysis martins!

After all there seems to be a major bug here!

It is confirmed that the SPI MISO sampling behavior clearly differs from the description in the manuals. This makes a vast range of SPI devices unusable at the moment with the ESP32-S3 because many devices don't ...

Hi
try it

spi_device_interface_config_t
.flag = SPI_DEVICE_NO_DUMMY



Thank you for that hint.

However, I have tried this and it made no difference. I still see that the ESP32-S3 only reads MISO line on the falling edge of the SPI clock in SPI mode 3.

Here is the code i used with the ...

One more info:

I have tried moving the high pulse over the falling edge, and suddenly the ESP32-S3 recognizes it, even though in it's SPI-Mode 3: ESP IDF version is 5.1.1.
This seems to be like a major bug in either ESP IDF, or worse, the ESP32-S3 silicon, or not?

I had a look into the Esp32-S3 Reference Manual and according to that MISO Line should be sampled on the rising edge of SCLK:
rm_mode3.PNG

I wrote a quick program to check this:


#include <stdio.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <driver/spi_master.h ...