opentx/opentx — pull request #1886 by projectkk2glider (2014-11-30 18:51:33+00:00)
Title: Rotary encoder emulates PLUS and MINUS keys on X9DE

Second take on rotary encoder support for 9xde. This one emulates PLUS and MINUS keys. It also apparently supports very fast rotation of encoder, so maybe counter based driver is not necessary and this polled variant will do.