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UART STM32F429 & STM32F407 discovery

Question asked by bagnasco.pierpaolo on Jun 13, 2014

I'm testing the two discovery STM32F429 and STM32F407.
What I've done so far is that the 429 sends data to the 407 through UART4.
The 407 interrupts at every character received, and all works fine!

If I do the opposite (the 407 sends data to the 429) nothing happens.

I'm using the same code and I don't understand why it works only in a verse.
I tried to use a different RX pin on the 429, but nothing changes.

The only thing different is that I'm using the USB (not OTG) with the 429 to print to PC the characters (not) received from the 407.