STM32H750VBT6 can't work LTDC function

[eric.hsu]

I was use CubeMX create a LTDC function for STM32H750VBT6

my steps：

1.Open CubeMX

2.MCU Select：STM32H750VBT6

3.Function Select：RCC�?LTDC�?DEBUG�?SPI6�?FREERTOS

4.Generate Code to create a new project

5.Open this project by IDE

6.Download and Run

7.Crash

I executed the code,only if this code is executed, it must be crash.

I used Nucleo-H743ZI to do the same steps, it wasn't work too.

But, I used STM32H750B-DK to do the same steps, it's work ok.

How to solve this bug?

[berendi]

I've had a similar problem with STM32H743ZI, MCU locked up when accessing certain LTDC registers. Some other clock was 10% off as well, so I was quite certain that there is an issue with the SystemClock_Config() function generated by CubeMX, or with some HAL functions that it calls.

I have replaced the SystemClock_Config() function with my own, going through the PWR and RCC chapters of the reference manual, and setting every parameter using the register interface.

• Enable LDO*
• Select VOS 1*
• Set D1,D2,D3 prescalers
• Disable PLLs*
• Set PLL parameters (you can skip PLL2)
• Enable PLLs*
• Switch system clock source to PLL*
• Set peripheral clock sources in SYSCFG (I think you can skip this step in your setup)

* means that after setting these parameters, you must wait until the corresponding status bit is set before proceeding to the next step.

[eric.hsu]

I also suspect that there is a problem with the SystemClock_Config generated by CubeMX.

My LTDC PCLK setting originally is 9MHz.

I tried to change from 9MHz to 15MHz, and this problem was solved.