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UARTS on a STM32L475VG Discovery board

Question asked by Timothy Mulrooney on Jan 11, 2018
Latest reply on Jan 12, 2018 by Clive One

I have a Amazon Web Services example (AWS) example running on a STM32L475 Discovery board. I got the example from en.stsw-stm32078.zip and it in the C:\...\st Micro\en.x-cube-aws\STM32CubeExpansion_Cloud_AWS_V1.0.1\Projects\B-L475E-IOT01\Applications\Cloud\AWS directory.

It is working perfectly and all is fine. I need to add  external UARTs and I was trying to see how to connect a UART4 and USART4 to the Arduino connector at P0/P1  and PA2/PA3 using UART4 and USART2. the documentation seems to suggest that it is possible but I do not see how to set it up and configure it.
I have tried many things but nothing is working.
I am new to the discovery board and I plan to use all of the devices and interfaces on this for a embedded product. I am already using the debug console for the simple command interface (printf/getc/etc.). I need UART4 and USART2 to connect to an external devices.
The external UART4 and USART2 functionality is a crucial part of the project and cannot proceed with out it. I would greatly appreciate any help you can give.

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