I have some questions regarding the startup code file micropython/ports/stm32/resethandler.s.

[mong87suk]

I have some questions regarding the startup code file micropython/ports/stm32/resethandler.s.

/* Save the first argument to pass through to stm32_main */
mov  r4, r0
....

/* Jump to the main code */
mov  r0, r4
b    stm32_main

1. The instruction mov r4, r0 means r4 = r0 as far as I understand. What value is stored in r0?

2. The instruction mov r0, r4 means r0 = r4 as far as I understand. What value is stored in r4?

3. Is r0 passed as the parameter reset_mode to the main function?

void stm32_main(uint32_t reset_mode)

Please review the above content and let me know if there are any parts you don't understand.