SPI peripheral configuration help

[marcusdufrane]

Have been struggling to get SPI to work. I have been working in the engineering boot mode to try and trouble shoot my issues.

I have configured PLL3 to run the MCU at 48MHz and the SPI peripheral kernel clk to run at 108MHz and selected the clock sources in the RCC regs accordingly, I have implemented the procedure for configuring SPI in the related section in the reference manual. The GPIO have been configured to their appropriate modes and alternate functions. I have enabled the peripheral bus in RCC.

I am able to confirm the register setting via the debugger.

However, when I try to send data, I see nothing on the GPIO. I also don't see any flags reported when attempting to overfill the TXFIFO to elicit a response from the peripheral.

I am not using the HAL library directly, though I have looked through it to see what I may have missed to no avail.

Can anyone let me know if there is another enable bit, power bit or otherwise that I may be overlooking?

[marcusdufrane · Accepted solution]

Simple questions have stupid simple answers. Was simply missing that MODF was being set due to a config error when using software nss.

[PatrickF]

Hi,

Please confirm you are using an STM32MP15x ?

Glad to see you solved your issue.

Usually trying generating code using CubeMX and do side-by-side comparisons will help.

Examples provided on CubeMP1 in Projects\STM32MP157C-DK2\Examples\SPI folder could also help you.

Regards.