smartknob/proto/smartknob.proto

syntax = "proto3";

import "nanopb.proto";

package PB;

/*
 * Message FROM the SmartKnob to USB host
 */
message FromSmartKnob {
    oneof payload {
        Ack ack = 1;
        Log log = 2;
        SmartKnobState smartknob_state = 3;
    }
}

message Ack {
    uint32 nonce = 1;
}

message Log {
    string msg = 1 [(nanopb).max_length = 255];
}

message SmartKnobState {
    int32 current_position = 1;
    float sub_position_unit = 2;
    SmartKnobConfig config = 3;
}

/*
 * Message TO the Smartknob from the USB host
 */
message ToSmartknob {
    uint32 nonce = 1;

    oneof payload {
        RequestState request_state = 2;
        SmartKnobConfig smartknob_config = 3;
    }
}

message SmartKnobConfig {
    int32 position = 1;
    int32 min_position = 2;
    int32 max_position = 3;
    float position_width_radians = 4;
    float detent_strength_unit = 5;
    float endstop_strength_unit = 6;
    float snap_point = 7;
    string text = 8 [(nanopb).max_length = 50];
    repeated int32 detent_positions = 9 [(nanopb).max_count = 5];
    float snap_point_bias = 10;
}

message RequestState {}