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STM32F4 broken USART

Question asked by Tom on Jan 21, 2013
Latest reply on Jan 22, 2013 by Andrew Neil

I have two identical cards with stm32f4 on them. I think one of them has a broken USART1 on it. If i erase flash on both cards, load the same code onto them, the USART1 only works on one of the cards. 

Everything else seems to work properly, including another USART. If i measure the Tx-pin, its constant high on the broken USART. 

Is there some way I can dig deeper into this problem to see what has happened? How do you break an USART, how sensitive are they?