STM32H573 SPI clock not working

[A_Bit_More]

I am following a basic example from stm32: Getting started with SPI - stm32mcu
I follow the steps for setting up SPI master with polling (Blocking mode). I did make sure to select the board STM32H573 DK instead of the one listed in the example.
I initially used SPI5, however it wouldn’t transmit anything and its clock was always high.
Then I switched to using SPI2, however it was always stuck low.

Any insight would be appreciated.

I connected a logic analyzer and here is an image of this :
 

[Andrew Neil]

Are you sure those pins aren't occupied by something else on the board?

Check with the User Manual and/or Schematics

Can you toggle the pins when they're just in GPIO output mode?

[Imen.D]

Hello @A_Bit_More ,

Please check this article includes SPI characteristics and clarification of maximum clock frequency for STM32H5 devices: SPI maximum clock frequency for STM32H5 MCUs devices when using PB13 and PB14 I/Os

[A_Bit_More]

Hi Andrew!
The only mode for the pin is Alternative Function PP and I have been able to set it high through STM32CubeMX. 

This is the User Manual I'm following : attached below
For spi2 I don't see anything directly connected to it, other than it being an extension for arduino to connect.
For spi5, I don't see anything directly connected to it either, other than it having an extension for STMOD+.

• I also don't have anything connected to the pmod. 
• I have the default configurations for the board so spi5 should be accessible

Note: there is a typo on Table 31, where it states some pins are for spi5, but they are really for spi2. You can verify with table 32.

[A_Bit_More]

Hi Imen.D

I'm not using PB13 or PB14.

Currently I'm using the default configs for the clock:

the pins I'm using: 
for spi2 is 

and for spi5 is : 

[waclawek.jan]

Read out and check/post content of SPI and relevant GPIO registers.

JW

[A_Bit_More · Accepted solution]

Update of the day: I was able to get SPI2 to work and still no success with getting SPI5 to work. I will continue forward with SPI2.

Solution for getting SPI2 to work:

I created a new project from the stm32cubemx, and my first setup was to only setup spi2. 

I set the Data Size to 8 bits (can keep at default of 4 bits just update the logic analyzer setup) and the prescaler to 32 (which sets the baudrate to 7.8125 MBits/s)

Notes:

• the system clock is set to max by default 250MHz
• The peripheral clock is set to the max by default as well of 250MHz
• Setting the prescaler to 32 -256 works great no issue, however when setting to a smaller value nothing transmits. 
• would like to note that C is detected in the image below which is not expected (I will need to check if this is due to also using SPI5).
• In the same project I tried to setup spi5, however regardless of the prescaler value nothing would transmit over the lines. 
• An image of the output for both spi2 and spi5:
• 

   

Other steps I took to try and to get spi5 and spi2 working: 

Original situation: I have the logic analyzer connected to the devkit and I am using the stmod+ extension. Image added at the bottom. 

• I had initialized spi5 first with an interrupt enable and tested it alone, but with no progress getting it to transmit. I then setup SPi2 on the same project. Result: no success getting it to transmit either. 
• I then proceeded to change the SPI5 setup from having interrupt enable to disable, to test only polling. Result: no success getting it to transmit.
• I then proceeded to change the SPI gpio pins for Maximum output speed to very high (originally at low). Result: no success getting it to transmit.
• then I proceeded to disable spi5 and continue testing with just spi2, I setup RCC and changed the HSE and LSE to use the Crystal/ceramic resonator. Result: no success, in transmitting.
• then I proceeded to cross examine my project with the example from stm32H7 for SPI. No main difference, everything looked to be setup correctly, nothing was missing on my end. 
• I also posted this issue on the stm32 forum and got two responses: link to post: STM32H573 SPI clock not working - STMicroelectronics Community
• 1: check if the pins are being used by other components
  • The pins weren't being used by another component and were free to use. Will note that the SPI5 pins had an extension/fan-out board to easily connect. 
• 2: check the SPI clock pins max output for PB13 and PB14. 
  • I checked the SPI2 and SPI5 pins but I wasn't using those pins listed. I did change the prescaler for both SPIs but no noticeable difference was made.
• i tried clearing out all the pin configuration and board, and then setup just spi 2. Result: no success in transmitting. 
• I was renaming my project example and lost access to the project, so I created a new project and setup only spi2 and changed the prescaler to 64, and it worked =)
• Image of setup for spi5
• 

[A_Bit_More]

For Future Reference: SPI2 is good to use with this settings and to Avoid using SPI5

Make sure Clock speed is 250MHz and peripheral clock speed is 250MHz

• 

These are the configurations for SPI2: Mode Master full-duplex

• set the datasize to 8 bits and prescaler to 32 to have a baudrate of 7.8125 MBits/s
•