nucleo-f746zg board programming with openocd

Question

I have a nucleo-144 board with stm32f746zg MCU. I'm trying to program the board with openocd, using gnu make and the makefile generated from stm32cubemx. I've added following line to my makefile to automate the flashing process:

flash: all
    openocd -f interface/stlink.cfg -f target/stm32f7x.cfg -c "program $(BUILD_DIR)/$(TARGET).elf verify reset exit"

The code compiles without any problem and when I type make flash in the terminal the result is:

❯ make flash
openocd -f interface/stlink.cfg -f target/stm32f7x.cfg -c "program build/my-board.elf verify reset exit"
Open On-Chip Debugger 0.11.0 (2021-11-18) [https://github.com/sysprogs/openocd]
Licensed under GNU GPL v2
libusb1 09e75e98b4d9ea7909e8837b7a3f00dda4589dc3
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
Info : auto-selecting first available session transport "hla_swd". To override use 'transport select <transport>'.
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
Info : DEPRECATED target event trace-config; use TPIU events {pre,post}-{enable,disable}
Info : clock speed 2000 kHz
Error: libusb_open() failed with LIBUSB_ERROR_NOT_SUPPORTED
Info : STLINK V2J33M25 (API v2) VID:PID 0483:374B
Info : Target voltage: 3.236769
Info : stm32f7x.cpu: Cortex-M7 r0p1 processor detected
Warn : Silicon bug: single stepping may enter pending exception handler!
Info : stm32f7x.cpu: target has 8 breakpoints, 4 watchpoints
Info : starting gdb server for stm32f7x.cpu on 3333
Error: couldn't bind gdb to socket on port 3333: No error
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x08002a18 msp: 0x20050000
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
** Programming Started **
Info : device id = 0x10016449
Info : flash size = 1024 kbytes
** Programming Finished **
** Verify Started **
** Verified OK **
** Resetting Target **
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
shutdown command invoked

But the program doesn't run on the board and there's no blinking. I tried this in windows and wsl ubuntu. In both cases the results are the same. Also tried loading the binary file instead of.elf but again no luck.

Can somebody tell me what am I doing wrong here?

Answer 1

Ok. I'm not sure if I should post this as an answer, but the problem wasn't either openocd or the broken hardware.

When I started the project in cubemx, I initialized the default nucleo-f746zg peripherals and for some reason (probably one of the peripherals need higher clock frequency to work properly) in clock configuration the default clock source is selected as HSE and this option cannot be changed . On the other hand the nucleo board doesn't come with an external oscillator and it should be soldered by the user. So after generating the code and flashing it to the board it causes an error and the program doesn't run. Although, I think there was a block of code in clock configuration of HAL libraries that would "try" to use HSE and PLL as clock source and in case of not responding or any problem in settings, the HSI would be used as default source.

Anyway when I start the project from MCU selector in cubemx and don't use nucleo initializations, I can set the clock to HSI and everything works fine.