Introduction #

Depending on your car, steering wheel controls are emitted through the CAN-Bus or the LIN-Bus. In V-Link we have a centralized module that takes care of both but needs to be configured correctly, depending on which interface you are using.

The file responsible for setting this up is swc.json.

SWC via CAN #

Below you find a preconfigured JSON file to use the CAN-Bus as source for the steering wheel controls.

{
    "type": "interface",
    "name": "swc",

 "controls": {
        "enabled": true,

        "interface": {
            "name": "can1",

            "bustype": "socketcan",
            "channel": "can1",
            "is_extended": true,
            "bitrate": 125000,

            "rep_id": "0x0131726C",
            "zero_message": ["0x00", "0x00", "0x3F"],
            "control_byte_count": 2
        },

        "config": {
            "long_press_duration": 1500,
            "click_timeout": 300,
            "mouse_speed": 6
        },

        "button": {
            "BTN_NEXT":     [["0x00", "0x3D"], ["0x80", "0x3D"], ["0x40", "0x3D"]],
            "BTN_PREV":     [["0x00", "0x3E"], ["0x80", "0x3E"], ["0x40", "0x3E"]],
            "BTN_VOL_UP":   null,
            "BTN_VOL_DOWN": null,
            "BTN_BACK":     [["0x10", "0x3F"], ["0x90", "0x3F"], ["0x50", "0x3F"]],
            "BTN_ENTER":    [["0x20", "0x3F"], ["0xA0", "0x3F"], ["0x60", "0x3F"]],
            "BTN_YES":      [["0x00", "0x2F"], ["0x80", "0x2F"], ["0x40", "0x2F"]],
            "BTN_NO":       [["0x00", "0x1F"], ["0x80", "0x1F"], ["0x40", "0x1F"]]
        },

        "joystick": {
            "BTN_UP":       [["0x08", "0x3F"], ["0x88", "0x3F"], ["0x48", "0x3F"]],
            "BTN_DOWN":     [["0x04", "0x3F"], ["0x84", "0x3F"], ["0x44", "0x3F"]],
            "BTN_LEFT":     [["0x01", "0x3F"], ["0x81", "0x3F"], ["0x41", "0x3F"]],
            "BTN_RIGHT":    [["0x02", "0x3F"], ["0x82", "0x3F"], ["0x42", "0x3F"]]
        }
    }
}

SWC via LIN #

Below you find a preconfigured JSON file to use the LIN-Bus as source for the steering wheel controls.

{
    "type": "interface",
    "name": "swc",

 "controls": {
        "enabled": true,
    
        "interface": {
            "name": "lin",

            "bitrate": 0,
            "timing": {
                "timeout": 0.1
            },
            "swm_id": "0x20",
            "sync_id": "0x55",
            "zero_code": "0xFF",
            "ign_on": ["0x50", "0x0E", "0x00", "0xF1"]
        },

        "config": {
            "long_press_duration": 1500,
            "click_timeout": 300,
            "mouse_speed": 6
        },

        "button": {
            "BTN_NEXT":     ["0x20", "0x00", "0x10", "0x00", "0x00"],
            "BTN_PREV":     ["0x20", "0x00", "0x02", "0x00", "0x00"],
            "BTN_VOL_UP":   ["0x20", "0x00", "0x00", "0x01", "0x00"],
            "BTN_VOL_DOWN": ["0x20", "0x00", "0x80", "0x00", "0x00"],
            "BTN_BACK":     ["0x20", "0x00", "0x01", "0x00", "0x00"],
            "BTN_ENTER":    ["0x20", "0x00", "0x08", "0x00", "0x00"],
            "BTN_YES":      null,
            "BTN_NO":       null
        },

        "joystick": {
            "BTN_UP":       ["0x20", "0x01", "0x00", "0x00", "0x00"],
            "BTN_DOWN":     ["0x20", "0x02", "0x00", "0x00", "0x00"],
            "BTN_LEFT":     ["0x20", "0x04", "0x00", "0x00", "0x00"],
            "BTN_RIGHT":    ["0x20", "0x08", "0x00", "0x00", "0x00"] 
        }
    }
}