When I use this:
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#define SERIAL_SUM_PPM ROLL,PITCH,THROTTLE,YAW,AUX1,AUX2,AUX3,AUX4,8,9,10,11 //For Robe/Hitec/Futaba
Everything is correct except ROLL and YAW are swapped. In other words when I push the rudder stick it does ROLL in MultiWiiConf and when I push the aileron stick it does YAW.
OK, simple enough to fix, right? Just swap ROLL and YAW. So I use this line:
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#define SERIAL_SUM_PPM YAW,PITCH,THROTTLE,ROLL,AUX1,AUX2,AUX3,AUX4,8,9,10,11 //For er9x default
Now everything is screwed up. The throttle stick does ROLL, the rudder stick does THROTTLE, PITCH works normal, and aileron does YAW. I changed nothing other than the SERIAL_SUM_PPM line. WTF?!