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!)
Tony Corbett, G0WFV
Andy CA6JAU