how to unlocking pin stm32f103

Note that this is a specific question about an ST product - it has nothing to do with Keil or ARM.

And is not so different from many other questions posted on this forum.

Section 9.2.7 of the RM0008 reference manual states:

When the LOCK sequence has been applied on a port bit it is no longer
possible to modify the value of the port bit until the next reset.

Note that this is a specific question about an ST product - it has nothing to do with Keil or ARM.

And is not so different from many other questions posted on this forum.

Section 9.2.7 of the RM0008 reference manual states:

When the LOCK sequence has been applied on a port bit it is no longer
possible to modify the value of the port bit until the next reset.

There is no unlock. You cannot modify a port bit once it has been locked until you do a reset. (See Section 9.2.7 of the RM0008 reference manual)

Thanks for the answer,
I think in stm32f103 have a gpio unlock pin function, in fact not have. I think that because I have use nuvoton nuc100 series cortex m0, they have gpio lock & unlock pin function. OK thanks all, I'm understand now.