STM32F407 write protected on chip

[Ark1]

Hi folks, i have an STM32F407 discovery board. when i measure the voltage across the gpio pins it becomes write protected. after i dumped many codes but no use. i had attached the screenshot with the error code that it's display. i tried to put jumper between the boot 0 and 5v results no use. i refer so many solution and tried it but no use. so what i do now?

@Community member​ 

@Imen DAHMEN​ 

[Tesla DeLorean]

Hopefully not 5V, the discovery board is running the chip at 3V

You should have a while(1) loop at the end of main() so it doesn't exit.

If the ST-LINK Utilities cannot connect and erase the part with BOOT0 connected to 3V you need to consider if you have damaged the chip or other components on the board. You should perhaps review the schematic and scope some voltage points, and voltage on the VCAPs

[Ark1]

1.what if the chip is damaged?

2.how did i find, that the chip is damaged?

3.can i able to use it or dump it trash?

@Community member​ 

[Tesla DeLorean]

You'd start with schematic and probing voltages to make sure it is not an issue with the regulators or supplies.

If you have a second board you can compare/contrast measurements.

If parts are damaged you need to replace them, fused silicon is not fixed with good intentions.

I tend not to throw out boards, just mark them as NFG and cannibalize them for usable parts later.

[Ark1]

ok 👍 @Community member​ 

[abdullahcavuss]

Hello,

Have you found which io pin voltage measurements make the option bytes write-protected? I think I have the same problem. Thank you 🙂