STM32H743 SPI1 not working

[Handzic.Dirk]

Posted on May 09, 2018 at 08:21

Hi,

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.

Regards

Dirk

[waclawek.jan]

Posted on May 09, 2018 at 08:50

Re-check the SPI registers' content, or post it here.

Try to set these pins as GPIO outputs and wiggle them manually through GPIO.

Try the SPI on other pins on the GPIO matrix using the same SPI.

You can do all this in the debugger, without writing a single line of code.

JW

[Handzic.Dirk]

Posted on May 09, 2018 at 09:58

Ok, I have found the problem and the solution:

I had selected PLL2 output P as clock source for SPI1. In HAL_RCCEx_PeriphCLKConfig() __HAL_RCC_PLL2CLKOUT_ENABLE(RCC_PLL2_DIVP); is called but using the debugger I found that DIVP2EN in RCC_PLLCFGR will NOT be set. This bit seems to be stuck at '0'!! *(__IO uint32_t *) 0x5802442C |= 0x00080000; will not set it according to the debugger register readout either.

For now I select PLL3 output P as the clock source and SPI1 is working

Best regards

Dirk

[Nawres GHARBI]

Posted on May 16, 2018 at 17:53

Hi

Handzic.Dirk

‌

Is there any other peripheral using the PLL2 ?

[Handzic.Dirk]

Posted on May 16, 2018 at 18:54

Well, initially ADC used PLL2 too and did not work either. The only way to get it working has been to use PCLK. PLL3 does not work as clocksource either. All configurations taken directly from CubeMX generated code latest versions of everything.

Regards

Dirk

Skickat från min iPhone

16 maj 2018 kl. 18:28 skrev Nawres GHARBI <[e-mail]>:

STMicroelectronics Community

Re: STM32H743 SPI1 not working

reply from Nawres GHARBI in STM32 MCUs Forum - View the full discussion

Hi handzic.dirk

Is there any other peripheral using the PLL2 ?

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[Amel NASRI]

Posted on July 05, 2018 at 16:46

Hello,

There is a bug in RCC driver already confirmed and a patch is provided in

https://community.st.com/0D50X00009XkZJxSAN

.

-Amel

[Amel NASRI]

Hello,

Please note that a fix is deployed in current version (1.3.0) of STM32CubeH7 and applied for RCC driver.

-Amel