use PA13 as GPIO

[mike louaillier]

Posted on July 10, 2017 at 04:37

Hello i wanna lite an LED with PA13, but i also wanna be able to use the SW interface to update the code. anybody know how to do both contemporaneously?

thanx, mike

[Zt Liu]

Posted on July 10, 2017 at 06:17

After reset, PA13 PA14 debug pins are enabled,

you may check by software:

if it's not in debug mode, (eg. in CM3/CM4 check DHCS register)

,then config them as gpio ouput.

[mike louaillier]

Posted on July 10, 2017 at 06:21

you mean lines 13 & 14 start in debug mode by default before my code executes?

[Zt Liu]

Posted on July 10, 2017 at 06:32

Normally, those pins are assigned for DBG IOs after reset.

You may reconfigure them as you need, once you didn't detect in debug mode.

[mike louaillier]

Posted on July 10, 2017 at 06:39

ok i see. THANK YOU Zhitai :)

[Nesrine M_O]

Posted on July 10, 2017 at 09:42

https://community.st.com/0D50X00009bMM5DSAW

mike louaillier wrote:

ok i see. THANK YOU Zhitai :)