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After using USART1 (PB6, PB7), I can not connect to ST-Link, even if I have disabled JTAG

Question asked by keys king on Aug 19, 2017
Latest reply on Aug 19, 2017 by keys king

In my project, I need to use PB6, PB7 as the pins of USART1.

But,when I set it,I can't  connect to ST-Link,