New Firmware v18x with changes from the previous release:
- shift register interface optimizations and improvements of the button box firmware
- added 4x4 button matrix (only available in the firmware v180 or v180m with "t" option)
- fixed timing of periodic effects, start delay, and duration
- 8 individual buttons (activated by shorting the corresponding pin to gnd)
- new HX711 library
- added 2nd FFB axis in HID (fix for LFS and fedit, but no 2nd PWM ffb output yet)
- increased resolution of effect direction in HID descriptor to 16bit
- implemented direction enable (available only for constant force effect currently)
- optimized the FFB protocol debugging via UART
- reduced the stiffness or coefficient for the spring effect (does not affect the centering spring)