[SOLVED] [STM32H503] SPI1 does not send anything

[smalcom]

Good day, everyone.

I'm trying to launch SPI1 under Arduino IDE. The transmission didn't work and I switched to direct control of the registers.

The problem is solved. By default, stm32duino sets the system clocking from PLL1P. And SPI1 cannot use this signal as a source. I switched SPI1 to clocking from PER_CK and everything worked.

Copy of the stthread

[fpistm]

Hi @smalcom
in fact there is 2 issues, first is the HSE should not be used as stated in the errata sheet.
Second, the SPI input freq is simply to high.

I've created an issue from this discussion: #2598

Note:
by default SPI1 is feed by PLL1Q not PLL1P.

[smalcom]

Cool, superfast fix.
Thank you.