I have designed a STM32H743II board and now I am testing hardware functionality. I have a serial FLASH connected to SPI5 which works fine. I have a serial EEPROM connected to SPI1 where I can not see any activity on the lines at all. I am using the CubeMX generated MX_SPI1_Init() function and I have checked the SPI1 and GPIO registers to be set ok with a SWD debugger. Peripheral clocks seem to work since the register values change. There is just no activity at the I/O pins when I check with an oscilloscope. There are no shorts on these lines (checked with multimeter). Also tested using I/O toggling SCK, MOSI, MISO and it will work so nothing wrong with the pcb or I/O ports.
Any suggestions are appreciated.