Encoder Fix - FSM Quadrature State Machine

Encoder Fix - FSM Quadrature State Machine

Fixes multiple encoder issues in FreeJoy firmware.

Problems fixed

• Ghost HID output when partially rotating and releasing the encoder
• Lost pulses on EC11 encoders due to time and direction blocking
• First step lost when quickly changing rotation direction

Solution

Replaced the original lookup table logic with a full quadrature FSM (Finite State Machine) for ENCODER_CONF_1x and ENCODER_CONF_2x modes.

• Bounce rejection is handled automatically by the FSM
• Direction changes are detected immediately without losing the first step
• ENCODER_CONF_4x keeps the original enc_array_4 logic, required for encoders like the ALPS RKJXT1F42001

Modified files

• application/Src/encoders.c
• application/Inc/common_types.h (added fsm_state field to encoder_state_t struct)

Tested on

• EC16 (ENCODER_CONF_1x)
• EC11 (ENCODER_CONF_1x)
• ALPS RKJXT1F42001 (ENCODER_CONF_4x)

Installation

Flash FreeJoy.bin using FreeJoy Configurator, or FreeJoy.hex using ST-Link or similar programmer.