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Segnix on Raspberry Pi 2 for GPIO

 Has anyone had luck with controlling GPIO pins using Segnix on Raspberry Pi 2 for incorporating the Nextion screen?

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That is indeed a fairly narrow segment

   Nextion is used by 10,000+MCUs in 100's of languages

   Nextion is just a simple Serial RX/TX TTL level device

Perhaps a better question might be at Segnix

  how does Segnix configure GPIO pins for RX/TX TTL serial usage with a Raspberry Pi 2

Then with pins configured for serial,

 - select which programming language you can use with

Ask at compiler forums for chosen compiler and language

 - for any basic text based serial examples (in / out)

This way your MCU is configured and ready for Nextion

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