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Trying the basic serial test at https://mbed.org/teams/ST/code/Nucleo_printf/
Using mbed library 78 as included if the above is imported, all is fine. Upgrading to latest mbed library version 81 I get this:
Error: Identifier "SERIAL_TX" is undefined in "main.cpp", Line: 8, Col: 11 Error: Identifier "SERIAL_RX" is undefined in "main.cpp", Line: 8, Col: 22
When tried with Nucleo F401RE board this compiles and runs OK.
Thanks
Andrew