knx_group_addresses.js

(function() {

    var knx_vdev_obj = {
        title: "KNX Group Addresses",
        cells: {
            "2-2-1": {
                type: "switch",
                value: false
            },
            "2-2-2": {
                type: "switch",
                value: false
            },
            "0-0-6": {
                type: "pushbutton",
                value: false
            },
            "1-1-16": {
                type: "value",
                value: 0,
                knx_type: "wide"
            },
            "1-1-9": {
                type: "range",
                max: 255,
                value: 0,
                knx_type: "wide"
            }
        }
    };



    var vdev_when_changed = [];
    var vdev_devid = "knx_group_addrs";

    for (var control_id in knx_vdev_obj.cells) {
        if (knx_vdev_obj.cells.hasOwnProperty(control_id)) {
            vdev_when_changed.push("knx_group_addrs/" + control_id);
        }
    }

    defineVirtualDevice(vdev_devid, knx_vdev_obj);

    defineRule("knx_vdev_feedback", {
        whenChanged: vdev_when_changed,
        then: function(newValue, devName, cellName) {
            var group_address = cellName.split("-").join("/");

            var value = +newValue;
            log("knx vdev rule {} {} {} {}", newValue, devName, cellName, value);

            var write_str = "";


            if (knx_vdev_obj.cells[cellName].knx_type == "wide") {
                while (value > 0) {
                    var rem = value % 256;
                    value = Math.floor(value / 256);
                    write_str = rem + " " + write_str;
                }
                write_str = "0 " + write_str;
            } else {
                write_str = "" + value;
            }


            if (write_str) {
                dev["knx/data"] = "g:{} GroupValueWrite {}".format(group_address, write_str);
            }
        }
    });

    defineRule("knx_vdev_incoming", {
        whenChanged: "knx/data",
        then: function(newValue, devName, cellName) {
            var arr = newValue.split(/\s/);
            var sourceAddr = arr[0].split(/i\:|\,/);
            var groupAddr = arr[1].split(/g\:|\,/);
            var arr1 = newValue.split(/GroupValueWrite/);
            var value = arr1[1];

            if ((sourceAddr[1] == "0/0/0") || (sourceAddr[1] == "1/1/255")) { // skip local echo
                return;
            }

            log("knx vdev incoming rule {}", newValue);
            dev[vdev_devid][groupAddr[1].split("/").join("-")] = parseInt(value, 16);
        }
    });

})()



function knxConvertToFloat16(value) {
    var sign = 0;
    var exp = 0;
    if (value < 0) {
        sign = 1;
    }

    var mant = Math.floor(value * 100);
    while ((mant < -2048) || (mant > 2047)) {
        mant = mant >> 1;
        exp += 1
    }
    
    var data = (sign << 15) | (exp << 11) | (mant & 0x07ff);
    return data;
};