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Where is USART1 RX pin (PA10) connected to in STM32F429 discovery

Question asked by sammalisto.pauli on May 8, 2016
Latest reply on May 8, 2016 by sammalisto.pauli
I am trying to receive serial data via USART1 in STM32F429 discovery, but something is holding PA10 high so strongly, that MAX3232 cannot drive it down.  According to the schematic there should not be any pullup resistors or something.  SB15 is not fitted.