SPI communication link on a Nucleo board

Hi,

I try to use the SPI communication link from a Nucleo board (NUCLEO-H743ZI2) to stream short messages. I wired up the board to an Arduino, which is running a simple SPI slave, which worked with a GNSS module (MIKROE-3922 GNSS Click 7).

When I use Monitor & Tune, in Data Inspector, I see that, the SPI Master Transfer block gets the streamed values as input and it outputs zeros constantly.

On the hardware, I checked clock signal from the master, and I could not find it.

On Arduino, I saw 15 0xFFs and then the communication stopped.

When I use Build, Deploy & Start, I get three or four odd characters, pretty much noise, some are zeros, but that suggest me that, the communication link is active for a short time, when the software start running.

When I use Connected I/O, I have a continuous stream of FFs on Arduino, but after a couple of seconds, I am getting an error message, the SPI is not available, and I get the same error after any further attempt to run the software, even after clearing the workspace and re-open the model.

So the model is clearly running and the communication is active, although the values are FF, not the expected ones.

I am aware of the only example ‘Communicating with an SPI based EEPROM Using the STMicroelectronics Nucleo Board’, which I managed to build with strange results (block outlines are marked by red), see attached screenshot and I did not received anything on the Arduino side.

I am not sure if I missed something or did something wrong, so any suggestions or help would be appreciated.

Zoltan