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The serial port connection for stm32f4discovery board

Question asked by zhou.yuanbin on Jul 9, 2015
Latest reply on Jul 9, 2015 by Clive One
Hi!I am new to STM32F4Discovery and FreeRTOS,and recently I run FreeRTOS on STM32F4Discovery board,but I found that it is hard to use serial port since there are too many uart pins on this board,so My questions is that how can I successfully connect the "usb to ttl" board to Discovery board(You know that B6/B7,A8/A9 all stands for USART1). In addition, I change the value of "HSE_VALUE" to 8000000 since the frequency of external crystal is 8MHz.