Porting stm32h745 for zephyr

[GaelRap]

Hello everyone, I try to use Zephyr on STM32h745I_DISCO board but the board is not natively ported. So I try making my own configuration file inspired on nucleo_h745zi_q configuration files.

Actually I totally copy/paste the folder nucleo_h745zi_q and I rename it stm32h745i_disco I also change inside the folder every file containing nucleo_h745zi_q* by stm32h745*

The tree of my new folder

.
├── arduino_r3_connector.dtsi
├── board.cmake
├── doc
│   ├── img
│   │   └── stm32h745i_disco.jpg
│   └── index.rst
├── Kconfig.board
├── Kconfig.defconfig
├── stm32h745i_disco.dtsi
├── stm32h745i_disco_m4_defconfig
├── stm32h745i_disco_m4.dts
├── stm32h745i_disco_m4.yaml
├── stm32h745i_disco_m7_defconfig
├── stm32h745i_disco_m7.dts
└── stm32h745i_disco_m7.yaml

To try my new configuration I test with the sample basic/blinkyI change the user leds gpio to fit with what I have seen in the doc

		green_led: led_1 {
			gpios = <&gpioi 13 GPIO_ACTIVE_HIGH>;
			label = "User LD1";
		};

I have two warnings when compilation, and the binaries didn't work given the led didn't blink.

[94/156] Building C object zephyr/driv...ck_control.dir/clock_stm32_ll_h7.c.obj
/home/gael/Documents/S2OPC/Zephyr/zephyr/drivers/clock_control/clock_stm32_ll_h7.c: In function 'set_up_plls':
/home/gael/Documents/S2OPC/Zephyr/zephyr/drivers/clock_control/clock_stm32_ll_h7.c:542:6: warning: implicit declaration of function 'get_vco_input_range' [-Wimplicit-function-declaration]
  542 |  r = get_vco_input_range(STM32_PLL_M_DIVISOR, &vco_input_range);
      |      ^~~~~~~~~~~~~~~~~~~
/home/gael/Documents/S2OPC/Zephyr/zephyr/drivers/clock_control/clock_stm32_ll_h7.c:547:21: warning: implicit declaration of function 'get_vco_output_range' [-Wimplicit-function-declaration]
  547 |  vco_output_range = get_vco_output_range(vco_input_range);
      |                     ^~~~~~~~~~~~~~~~~~~~

Will be very gratefull if someone could help me to figure out where the issue is.

[erwango]

What is the SHA1 you're using ?
What command line are you using ?
Do you get the same issue when compiling nucleo_h745zi_q_m7 target on the same sample ?

On my side, I don't get any warning when compling nucleo_h745zi_q_m7 on following commit: zephyr-v3.0.0-2081-g99964fab45

[erwango]

Alos, about your board configuration, I can see that nucleo_h745zi_q clock configuration relies on HSE. Is it also available on disco board ?

[GaelRap]

I don't get any warning compiling with nucleo_h745zi_q_m7 on the following commit: zephyr 3.0.99 -8fc4e77d5
I think that there is no HSE on disco boards, I will try to link another source for the clocks
Thank you

[GaelRap]

I come back about the HSE, I found in this datasheet https://www.st.com/resource/en/datasheet/stm32h745xi.pdf page 2 that there is an HSE something that I don't find out in the specific datasheet of stm32h745i_disco https://www.st.com/resource/en/user_manual/dm00547983-discovery-kits-with-stm32h745xi-and-stm32h750xb-microcontrollers-stmicroelectronics.pdf

[erwango]

I come back about the HSE, I found in this datasheet https://www.st.com/resource/en/datasheet/stm32h745xi.pdf page 2 that there is an HSE something that I don't find out in the specific datasheet of stm32h745i_disco https://www.st.com/resource/en/user_manual/dm00547983-discovery-kits-with-stm32h745xi-and-stm32h750xb-microcontrollers-stmicroelectronics.pdf

Ok, then you need to fix dts configuration.
I'm moving this to a discussion, as it seems there is no bug here.

[GaelRap]

That's the thing I don't know what is critical in my dts and make the initialization of the MCU ineffective. I know some peripherals as the usart3 are not mapped with the good gpio pins but when when I try to modify them I get an error at compilation

-- Found BOARD.dts: /home/gael/Documents/S2OPC/Zephyr/zephyr/boards/arm/stm32h745i_disco/stm32h745i_disco_m7.dts
devicetree error: /soc/serial@40004800: undefined node label 'usart3_tx_pb11'
CMake Error at /home/gael/Documents/S2OPC/Zephyr/zephyr/cmake/modules/dts.cmake:212 (message):

And I didn't found out yet where I can modify the serial@40004800
But I can go through this problem modifying the file stm32h745i_disco_m7_defconfig what annoyed me is that with a minimal configuration I still cannot initialize the MCU.
Do you have an idea about which peripheral or which device I should look in priority ?
Also I have done a pull request the you can check exactly what I have. #44441