Normal boot when boot0 pull-up in B-G431B-ESC1 board

[DTort.1]

I absolutely cannot understand how the normal loading of the program on the B-G431B-ESC1 board occurs if, due to the use of timer 4 as an input for Hall sensors according to the boot0 (PB8) circuit, it is pulled up to 3.3V through a resistance of 10k. I made my board with exactly the same circuit and as expected normal boot from flash does not occur until boot0 is pulled low. Is there any trick on the B-G431B-ESC1 board?

[Mike_ST · Accepted solution]

Hello,

G4 familly has a software BOOT0 option, to avoid using the BOOT0 pin.

Please check SWBOOT0 / nBOOT0 / nBOOT1 option bytes with the STM32CubeProgrammer.

[Uwe Bonnes]

Maybe the ESC module has some fuses set w.r.t. boot0?

[Mike_ST]

During production, we set the MB1419 with nSWBOOT0=0 nBOOT0=1 when programming the demo code.

[DTort.1]

Wow, this is a real discovery :) I have already unchecked the boxes here, what else needs to be done?

[Mike_ST]

nBOOT0 => checked

which means BOOT=0.

Your program should start after that...

[DTort.1]

Oh, I got it:D

[DTort.1]

Thank you, now I understand how this happens.