Enables neater connection to erroneous boards with only 3 pins on USART2 like the one I have!
USART1 is now the default for Nextion serial repeater unless you define STM32_USART1_HOST or ZUMSPOT_LIBRE in Config.h
Needed to specify ZUMSPOT_LIBRE as separate board in Config.h as this only has a header for USART2 - Libre Kit will not use these changes.
All other boards appear to break out all USARTs in some form or other (specifically USART1)
EA7GIB's boards will now have a minor labelling error in that the header labelled Nextion (USART2) is no longer the Nextion port unless you define STM32_USART1_HOST or ZUMSPOT_LIBRE in Config.h. If like me your OCD triggers with this, define ZUMSPOT_LIBRE and the nextion will be forced to USART2 (as labelled!)
tested with gcc4.9.3 Ubuntu 16.10 (did not work before change, every second TX was lost)
tested also with gcc arm embedded q4 2016 on Ubuntu 16.10 (here original code worked as well)
No test with Arduino & other architectures yet
Tony Corbett, G0WFV
Andy CA6JAU
danilo