stm32f103 startup io initialization problem

[shan chen]

hello.

this is the first time I've had this problem , I describe this problem next:

1 the io initialization input is normal (this is the feature I want)

2 when I power off and restart, I find that the same pin initialization input is not responding

3 repeated power-off / power-on operation the pin initialization input sometimes does not respond

why does this happen, please tell me

thanks

[gbm]

Not sure what you mean by "io initialization input is normal", but:

1. Check if BOOT0 pin is at logic LOW (connected to GND directly or via resistor).

2. If there is a high-capacity capacitor (like 1000uF) in the power supply path, wait longer between power off and power on, or use Reset button.

[shan chen]

thank you for your help

1. "io initialization input is normal" means that the pin function i want is the input function.

2. just like you said, BOOT0 pin is at logic Low

3.max capacitor of the power supply is 100uf

thanks

[SofLit]

Hi @shan chen ,

Please share your minimal project, not only the main file (if possible the .ioc file). So the members of the community and us can help you.

[shan chen]

thank you for your help 

sorry, i tried many times, the .ioc file transfer failed

do you have any suggestions about the problems I mentioned or have you encountered similar problems before

best wishes