Help to use SPI on NUCLEO-G491

[KatsuMat]

Hello,
I am not receiving SPI interrupt on the NUCLEO-G491, and I would like some support.
Here is the source code project.

https://github.com/katsumat/STM32CubeIDE/tree/main/workspace_1.16.1/SPI

Specifically, I would like to perform the following actions:

single line name

SPI connection.

Here is the waveform for SPI1

I have set a breakpoint here at /* USER CODE BEGIN 3 */, but it is not being hit.

I have set a breakpoint at SPI2_IRQHandler, but it is not being hit. Could you advise me on why the interrupt is not occurring?

[Karl Yamashita]

You have your pins swapped. MISO (Serial Out) and MOSI (Serial In)

PA6 connects to PB15 and PA7 connects to PB14

[TDK]

PF1 is not connected to the CN7 header by default.

Must close SB24 and open SB25.

[KatsuMat]

Thank you for your response!
I have set SPI1 as master and SPI2 as slave.
In this case, I believe I should connect PA6 to PB14 and PA7 to PB15.
Is this correct, or am I mistaken?

[TDK]

Based on your photo of MOSI connected to MOSI, this is incorrect. For SPI communications, MOSI on the master is connected to MISO on the slave.

MOSI = master out (master drives), slave in (slave reads)

MISO = master in, slave out

Edit: the above is nonsense. MOSI should be connected to MOSI. I was clearly distracted writing this.

[KatsuMat]

Hi TDK san.

Thanks!!

OK!
I need to move the resistor from SB25 to SB24 with solder...

[TDK]

Note that my previous reply about MOSI/MISO was incorrect. It has been fixed.

The reply about SB24/SB25 is correct.

[Karl Yamashita]

Sorry, I had a brain fart. I've been working on multiple slave devices that are communicating in series due to small pin count with limited I/O's for CS. For that type of setup, it is MISO to MOSI between slave devices. 

But for your setup, you had the connection correct. Sorry for the confusion.

[KatsuMat · Accepted solution]

Thank you very much!

Interrupts are now working, and communication has been successfully established.