2018-05-08 11:21 PM
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
2018-05-08 11:50 PM
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
2018-05-09 12:58 AM
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
2018-05-16 10:53 AM
Hi
Handzic.Dirk
Is there any other peripheral using the PLL2 ?
2018-05-16 11:54 AM
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
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16 maj 2018 kl. 18:28 skrev Nawres GHARBI <st-microelectronics@jiveon.com>:
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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2018-07-05 07:46 AM
Hello,
There is a bug in RCC driver already confirmed and a patch is provided in
https://community.st.com/0D50X00009XkZJxSAN
.-Amel
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2018-07-26 05:25 AM
Hello,
Please note that a fix is deployed in current version (1.3.0) of STM32CubeH7 and applied for RCC driver.
-Amel
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