const initRegisterArray: number[] = [
    0xEF, 0x00, 0x32, 0x29, 0x33, 0x01, 0x34, 0x00, 0x35, 0x01, 0x36, 0x00, 0x37, 0x07, 0x38, 0x17,
    0x39, 0x06, 0x3A, 0x12, 0x3F, 0x00, 0x40, 0x02, 0x41, 0xFF, 0x42, 0x01, 0x46, 0x2D, 0x47, 0x0F,
    0x48, 0x3C, 0x49, 0x00, 0x4A, 0x1E, 0x4B, 0x00, 0x4C, 0x20, 0x4D, 0x00, 0x4E, 0x1A, 0x4F, 0x14,
    0x50, 0x00, 0x51, 0x10, 0x52, 0x00, 0x5C, 0x02, 0x5D, 0x00, 0x5E, 0x10, 0x5F, 0x3F, 0x60, 0x27,
    0x61, 0x28, 0x62, 0x00, 0x63, 0x03, 0x64, 0xF7, 0x65, 0x03, 0x66, 0xD9, 0x67, 0x03, 0x68, 0x01,
    0x69, 0xC8, 0x6A, 0x40, 0x6D, 0x04, 0x6E, 0x00, 0x6F, 0x00, 0x70, 0x80, 0x71, 0x00, 0x72, 0x00,
    0x73, 0x00, 0x74, 0xF0, 0x75, 0x00, 0x80, 0x42, 0x81, 0x44, 0x82, 0x04, 0x83, 0x20, 0x84, 0x20,
    0x85, 0x00, 0x86, 0x10, 0x87, 0x00, 0x88, 0x05, 0x89, 0x18, 0x8A, 0x10, 0x8B, 0x01, 0x8C, 0x37,
    0x8D, 0x00, 0x8E, 0xF0, 0x8F, 0x81, 0x90, 0x06, 0x91, 0x06, 0x92, 0x1E, 0x93, 0x0D, 0x94, 0x0A,
    0x95, 0x0A, 0x96, 0x0C, 0x97, 0x05, 0x98, 0x0A, 0x99, 0x41, 0x9A, 0x14, 0x9B, 0x0A, 0x9C, 0x3F,
    0x9D, 0x33, 0x9E, 0xAE, 0x9F, 0xF9, 0xA0, 0x48, 0xA1, 0x13, 0xA2, 0x10, 0xA3, 0x08, 0xA4, 0x30,
    0xA5, 0x19, 0xA6, 0x10, 0xA7, 0x08, 0xA8, 0x24, 0xA9, 0x04, 0xAA, 0x1E, 0xAB, 0x1E, 0xCC, 0x19,
    0xCD, 0x0B, 0xCE, 0x13, 0xCF, 0x64, 0xD0, 0x21, 0xD1, 0x0F, 0xD2, 0x88, 0xE0, 0x01, 0xE1, 0x04,
    0xE2, 0x41, 0xE3, 0xD6, 0xE4, 0x00, 0xE5, 0x0C, 0xE6, 0x0A, 0xE7, 0x00, 0xE8, 0x00, 0xE9, 0x00,
    0xEE, 0x07, 0xEF, 0x01, 0x00, 0x1E, 0x01, 0x1E, 0x02, 0x0F, 0x03, 0x10, 0x04, 0x02, 0x05, 0x00,
    0x06, 0xB0, 0x07, 0x04, 0x08, 0x0D, 0x09, 0x0E, 0x0A, 0x9C, 0x0B, 0x04, 0x0C, 0x05, 0x0D, 0x0F,
    0x0E, 0x02, 0x0F, 0x12, 0x10, 0x02, 0x11, 0x02, 0x12, 0x00, 0x13, 0x01, 0x14, 0x05, 0x15, 0x07,
    0x16, 0x05, 0x17, 0x07, 0x18, 0x01, 0x19, 0x04, 0x1A, 0x05, 0x1B, 0x0C, 0x1C, 0x2A, 0x1D, 0x01,
    0x1E, 0x00, 0x21, 0x00, 0x22, 0x00, 0x23, 0x00, 0x25, 0x01, 0x26, 0x00, 0x27, 0x39, 0x28, 0x7F,
    0x29, 0x08, 0x30, 0x03, 0x31, 0x00, 0x32, 0x1A, 0x33, 0x1A, 0x34, 0x07, 0x35, 0x07, 0x36, 0x01,
    0x37, 0xFF, 0x38, 0x36, 0x39, 0x07, 0x3A, 0x00, 0x3E, 0xFF, 0x3F, 0x00, 0x40, 0x77, 0x41, 0x40,
    0x42, 0x00, 0x43, 0x30, 0x44, 0xA0, 0x45, 0x5C, 0x46, 0x00, 0x47, 0x00, 0x48, 0x58, 0x4A, 0x1E,
    0x4B, 0x1E, 0x4C, 0x00, 0x4D, 0x00, 0x4E, 0xA0, 0x4F, 0x80, 0x50, 0x00, 0x51, 0x00, 0x52, 0x00,
    0x53, 0x00, 0x54, 0x00, 0x57, 0x80, 0x59, 0x10, 0x5A, 0x08, 0x5B, 0x94, 0x5C, 0xE8, 0x5D, 0x08,
    0x5E, 0x3D, 0x5F, 0x99, 0x60, 0x45, 0x61, 0x40, 0x63, 0x2D, 0x64, 0x02, 0x65, 0x96, 0x66, 0x00,
    0x67, 0x97, 0x68, 0x01, 0x69, 0xCD, 0x6A, 0x01, 0x6B, 0xB0, 0x6C, 0x04, 0x6D, 0x2C, 0x6E, 0x01,
    0x6F, 0x32, 0x71, 0x00, 0x72, 0x01, 0x73, 0x35, 0x74, 0x00, 0x75, 0x33, 0x76, 0x31, 0x77, 0x01,
    0x7C, 0x84, 0x7D, 0x03, 0x7E, 0x01
];

let TubeTab: number [] = [
    0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,
    0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
];

/**
 * Grove Gestures
 */
enum GroveGesture {
    //% block=None
    None = 0,
    //% block=Right
    Right = 1,
    //% block=Left
    Left = 2,
    //% block=Up
    Up = 3,
    //% block=Down
    Down = 4,
    //% block=Forward
    Forward = 5,
    //% block=Backward
    Backward = 6,
    //% block=Clockwise
    Clockwise = 7,
    //% block=Anticlockwise
    Anticlockwise = 8,
    //% block=Wave
    Wave = 9
}

enum GroveJoystickKey {
    //% block="None"
    None = 0,
    //% block="Right"
    Right = 1,
    //% block="Left"
    Left = 2,
    //% block="Up"
    Up = 3,
    //% block="Down"
    Down = 4,
    //% block="Upper left"
    UL = 5,
    //% block="Upper right"
    UR = 6,
    //% block="Lower left"
    LL = 7,
    //% block="Lower right"
    LR = 8,
    //% block="press"
    Press = 9
}


/**
 * Functions to operate Grove module.
 */
//% weight=10 color=#9F79EE icon="\uf1b3" block="Grove"
//% groups='["4-Digit","Ultrasonic","Gesture","Thumbjoystick","UartWiFi"]'
namespace grove {
    /**
     * 
     */
    export class PAJ7620 {
        private paj7620WriteReg(addr: number, cmd: number) {
            let buf: Buffer = pins.createBuffer(2);

            buf[0] = addr;
            buf[1] = cmd;

            pins.i2cWriteBuffer(0x73, buf, false);
        }

        private paj7620ReadReg(addr: number): number {
            let buf: Buffer = pins.createBuffer(1);

            buf[0] = addr;

            pins.i2cWriteBuffer(0x73, buf, false);

            buf = pins.i2cReadBuffer(0x73, 1, false);

            return buf[0];
        }

        private paj7620SelectBank(bank: number) {
            if (bank == 0) this.paj7620WriteReg(0xEF, 0);
            else if (bank == 1) this.paj7620WriteReg(0xEF, 1);
        }

        private paj7620Init() {
            let temp = 0;

            this.paj7620SelectBank(0);

            temp = this.paj7620ReadReg(0);
            if (temp == 0x20) {
                for (let i = 0; i < 438; i += 2) {
                    this.paj7620WriteReg(initRegisterArray[i], initRegisterArray[i + 1]);
                }
            }

            this.paj7620SelectBank(0);
        }

        /**
         * Create a new driver of Grove - Gesture
         */
        init() {
            this.paj7620Init();
            basic.pause(200);
        }

        /**
         * Detect and recognize the gestures from Grove - Gesture
         */

        read(): number {
            let data = 0, result = 0;

            data = this.paj7620ReadReg(0x43);
            switch (data) {
                case 0x01:
                    result = GroveGesture.Right;
                break;

                case 0x02:
                    result = GroveGesture.Left;
                break;

                case 0x04:
                    result = GroveGesture.Up;
                break;

                case 0x08:
                    result = GroveGesture.Down;
                break;

                case 0x10:
                    result = GroveGesture.Forward;
                break;

                case 0x20:
                    result = GroveGesture.Backward;
                break;

                case 0x40:
                    result = GroveGesture.Clockwise;
                break;

                case 0x80:
                    result = GroveGesture.Anticlockwise;
                break;

                default:
                    data = this.paj7620ReadReg(0x44);
                    if (data == 0x01)
                        result = GroveGesture.Wave;
                break;
            }

            return result;
        }
    }
    
    /**
     * 
     */
    export class TM1637
    {
        clkPin: DigitalPin;
        dataPin: DigitalPin;
        brightnessLevel: number;     
        pointFlag: boolean;
        buf: Buffer;

        private writeByte(wrData: number) 
        {
            for(let i = 0; i < 8; i ++)
            {
                pins.digitalWritePin(this.clkPin, 0);
                if(wrData & 0x01)pins.digitalWritePin(this.dataPin, 1);
                else pins.digitalWritePin(this.dataPin, 0);
                wrData >>= 1;
                pins.digitalWritePin(this.clkPin, 1);
            }
            
            pins.digitalWritePin(this.clkPin, 0); // Wait for ACK
            pins.digitalWritePin(this.dataPin, 1);
            pins.digitalWritePin(this.clkPin, 1);
        }
        
        private start()
        {
            pins.digitalWritePin(this.clkPin, 1);
            pins.digitalWritePin(this.dataPin, 1);
            pins.digitalWritePin(this.dataPin, 0);
            pins.digitalWritePin(this.clkPin, 0);
        }
        
        private stop()
        {
            pins.digitalWritePin(this.clkPin, 0);
            pins.digitalWritePin(this.dataPin, 0);
            pins.digitalWritePin(this.clkPin, 1);
            pins.digitalWritePin(this.dataPin, 1);
        }
        
        private coding(dispData: number): number
        {
            let pointData = 0;
            
            if(this.pointFlag == true)pointData = 0x80;
            else if(this.pointFlag == false)pointData = 0;
            
            if(dispData == 0x7f)dispData = 0x00 + pointData;
            else dispData = TubeTab[dispData] + pointData;
            
            return dispData;
        } 

        /**
         * Show a 4 digits number on display
         * @param dispData value of number
         */

        //% blockId=grove_tm1637_display_number block="%4Digit|show number|%dispData"
        //% group="4-Digit"
        show(dispData: number)
        {       
            let compare_01:number = dispData % 100;
            let compare_001:number = dispData % 1000;

            if(dispData < 10)
            {
                this.bit(dispData, 3);
                this.bit(0x7f, 2);
                this.bit(0x7f, 1);
                this.bit(0x7f, 0);                
            }
            else if(dispData < 100)
            {
                this.bit(dispData % 10, 3);
                if(dispData > 90){
                    this.bit(9, 2);
                } else{
                    this.bit(Math.floor(dispData / 10) % 10, 2);
                }
                
                this.bit(0x7f, 1);
                this.bit(0x7f, 0);
            }
            else if(dispData < 1000)
            {
                this.bit(dispData % 10, 3);
                if(compare_01 > 90){
                    this.bit(9, 2);
                } else{
                    this.bit(Math.floor(dispData / 10) % 10, 2);
                }
                if(compare_001 > 900){
                    this.bit(9, 1);
                } else{
                    this.bit(Math.floor(dispData / 100) % 10, 1);
                }
                this.bit(0x7f, 0);
            }
            else if(dispData < 10000)
            {
                this.bit(dispData % 10, 3);
                if(compare_01 > 90){
                    this.bit(9, 2);
                } else{
                    this.bit(Math.floor(dispData / 10) % 10, 2);
                }
                if(compare_001 > 900){
                    this.bit(9, 1);
                } else{
                    this.bit(Math.floor(dispData / 100) % 10, 1);
                }
                if(dispData > 9000){
                    this.bit(9, 0);
                } else{
                    this.bit(Math.floor(dispData / 1000) % 10, 0);
                }
            }
            else 
            {
                this.bit(9, 3);
                this.bit(9, 2);
                this.bit(9, 1);
                this.bit(9, 0);
            }
        }
        
        /**
         * Set the brightness level of display at from 0 to 7
         * @param level value of brightness light level
         */
        //% blockId=grove_tm1637_set_display_level block="%4Digit|brightness level to|%level"
        //% level.min=0 level.max=7
        //% group="4-Digit"
        set(level: number)
        {
            this.brightnessLevel = level;
            
            this.bit(this.buf[0], 0x00);
            this.bit(this.buf[1], 0x01);
            this.bit(this.buf[2], 0x02);
            this.bit(this.buf[3], 0x03);
        }
        
        /**
         * Show a single number from 0 to 9 at a specified digit of Grove - 4-Digit Display
         * @param dispData value of number
         * @param bitAddr value of bit number
         */
        //% blockId=grove_tm1637_display_bit block="%4Digit|show single number|%dispData|at digit|%bitAddr"
        //% dispData.min=0 dispData.max=9
        //% bitAddr.min=0 bitAddr.max=3
        //% group="4-Digit"
        bit(dispData: number, bitAddr: number)
        {
            if((dispData == 0x7f) || ((dispData <= 9) && (bitAddr <= 3)))
            {
                let segData = 0;
                
                segData = this.coding(dispData);
                this.start();
                this.writeByte(0x44);
                this.stop();
                this.start();
                this.writeByte(bitAddr | 0xc0);
                this.writeByte(segData);
                this.stop();
                this.start();
                this.writeByte(0x88 + this.brightnessLevel);
                this.stop();
                
                this.buf[bitAddr] = dispData;
            }
        }
        
        /**
         * Turn on or off the colon point on Grove - 4-Digit Display
         * @param pointEn value of point switch
         */
        //% blockId=grove_tm1637_display_point block="%4Digit|turn|%point|colon point"
        //% group="4-Digit"
        point(point: boolean)
        {
            this.pointFlag = point;
            
            this.bit(this.buf[0], 0x00);
            this.bit(this.buf[1], 0x01);
            this.bit(this.buf[2], 0x02);
            this.bit(this.buf[3], 0x03);
        }
        
        /**
         * Clear the display
         */
        //% blockId=grove_tm1637_display_clear block="%4Digit|clear"
        //% group="4-Digit"
        clear()
        {
            this.bit(0x7f, 0x00);
            this.bit(0x7f, 0x01);
            this.bit(0x7f, 0x02);
            this.bit(0x7f, 0x03);
        }
    }


    export class GroveJoystick
    {
        /**
         * Detect position from Grove - Thumb Joystick
         * @param xPin
         * @param yPin
         */
     
        joyread(xPin: AnalogPin, yPin: AnalogPin): number {

            let xdata = 0, ydata = 0, result = 0;
            if (xPin && yPin) {
                xdata = pins.analogReadPin(xPin);
                ydata = pins.analogReadPin(yPin);
                if (xdata > 1000) {
                    result = GroveJoystickKey.Press;
                }
                else if (xdata > 600) {
                    if (ydata > 600) result = GroveJoystickKey.UR;
                    else if (ydata < 400) result = GroveJoystickKey.LR;
                    else result = GroveJoystickKey.Right;
                }
                else if (xdata < 400) {
                    if (ydata > 600) result = GroveJoystickKey.UL;
                    else if (ydata < 400) result = GroveJoystickKey.LL;
                    else result = GroveJoystickKey.Left;
                }
                else {
                    if (ydata > 600) result = GroveJoystickKey.Up;
                    else if (ydata < 400) result = GroveJoystickKey.Down;
                    else result = GroveJoystickKey.None;
                }
            }
            else {
                result =  GroveJoystickKey.None;
            }
            return result;
        }
    }
    
    const gestureEventId = 3100;
    const joystickEventID = 3101;
    let lastGesture = GroveGesture.None;
    let lastJoystick = GroveJoystickKey.None;
    let distanceBackup: number = 0;
    let joystick = new GroveJoystick();
    let paj7620 = new PAJ7620();
    // adapted to Calliope mini V2 Core by M.Klein 17.09.2020
    
    /**
     * Create a new driver of Grove - Ultrasonic Sensor to measure distances in cm
     * @param pin signal pin of ultrasonic ranger module
     */
    //% blockId=grove_ultrasonic_centimeters_v2 block="(V2)Ultrasonic Sensor (in cm) at|%pin"
    //% pin.fieldEditor="gridpicker" pin.fieldOptions.columns=4
    //% pin.fieldOptions.tooltips="false" pin.fieldOptions.width="250"
    //% group="Ultrasonic" pin.defl=DigitalPin.C16

    export function measureInCentimetersV2(pin: DigitalPin): number
    {
        let duration = 0;
        let RangeInCentimeters = 0;
        
        pins.digitalWritePin(pin, 0);
        control.waitMicros(2);
        pins.digitalWritePin(pin, 1);
        control.waitMicros(20);
        pins.digitalWritePin(pin, 0);        
        duration = pins.pulseIn(pin, PulseValue.High, 50000); // Max duration 50 ms

        RangeInCentimeters = duration * 153 / 44 / 2 / 100 ;
               
        if(RangeInCentimeters > 0) distanceBackup = RangeInCentimeters;
        else RangeInCentimeters = distanceBackup;

        basic.pause(50);
        
        return RangeInCentimeters;
    }
    
     /**
     * Create a new driver Grove - Ultrasonic Sensor to measure distances in inch
     * @param pin signal pin of ultrasonic ranger module
     */
    //% blockId=grove_ultrasonic_inches_v2 block="(V2)Ultrasonic Sensor (in inch) at|%pin"
    //% pin.fieldEditor="gridpicker" pin.fieldOptions.columns=4
    //% pin.fieldOptions.tooltips="false" pin.fieldOptions.width="250"
    //% group="Ultrasonic" pin.defl=DigitalPin.C16
    export function measureInInchesV2(pin: DigitalPin): number
    {
        let duration = 0;
        let RangeInInches = 0;
        
        pins.digitalWritePin(pin, 0);
        control.waitMicros(2);
        pins.digitalWritePin(pin, 1);
        control.waitMicros(20);
        pins.digitalWritePin(pin, 0);
        duration = pins.pulseIn(pin, PulseValue.High, 100000); // Max duration 100 ms
        
        RangeInInches = duration * 153 / 113 / 2 / 100;
        
        if(RangeInInches > 0) distanceBackup = RangeInInches;
        else RangeInInches = distanceBackup;
        
        basic.pause(50);
        
        return RangeInInches;
    }
    
    /**
     * Create a new driver of Grove - Ultrasonic Sensor to measure distances in cm
     * @param pin signal pin of ultrasonic ranger module
     */
    //% blockId=grove_ultrasonic_centimeters block="Ultrasonic Sensor (in cm) at|%pin"
    //% pin.fieldEditor="gridpicker" pin.fieldOptions.columns=4
    //% pin.fieldOptions.tooltips="false" pin.fieldOptions.width="250"
    //% group="Ultrasonic" pin.defl=DigitalPin.C16

    export function measureInCentimeters(pin: DigitalPin): number
    {
        let duration = 0;
        let RangeInCentimeters = 0;
        
        pins.digitalWritePin(pin, 0);
        control.waitMicros(2);
        pins.digitalWritePin(pin, 1);
        control.waitMicros(20);
        pins.digitalWritePin(pin, 0);        
        duration = pins.pulseIn(pin, PulseValue.High, 50000); // Max duration 50 ms

        RangeInCentimeters = duration * 153 / 29 / 2 / 100;
               
        if(RangeInCentimeters > 0) distanceBackup = RangeInCentimeters;
        else RangeInCentimeters = distanceBackup;

        basic.pause(50);
        
        return RangeInCentimeters;
    }
    
    /**
     * Create a new driver Grove - Ultrasonic Sensor to measure distances in inch
     * @param pin signal pin of ultrasonic ranger module
     */
    //% blockId=grove_ultrasonic_inches block="Ultrasonic Sensor (in inch) at|%pin"
    //% pin.fieldEditor="gridpicker" pin.fieldOptions.columns=4
    //% pin.fieldOptions.tooltips="false" pin.fieldOptions.width="250"
    //% group="Ultrasonic" pin.defl=DigitalPin.C16
    export function measureInInches(pin: DigitalPin): number
    {
        let duration = 0;
        let RangeInInches = 0;
        
        pins.digitalWritePin(pin, 0);
        control.waitMicros(2);
        pins.digitalWritePin(pin, 1);
        control.waitMicros(20);
        pins.digitalWritePin(pin, 0);        
        duration = pins.pulseIn(pin, PulseValue.High, 100000); // Max duration 100 ms
        
        RangeInInches = duration * 153 / 74 / 2 / 100;
        
        if(RangeInInches > 0) distanceBackup = RangeInInches;
        else RangeInInches = distanceBackup;
        
        basic.pause(50);
        
        return RangeInInches;
    }
    
    /**
     * Create a new driver Grove - 4-Digit Display
     * @param clkPin value of clk pin number
     * @param dataPin value of data pin number
     */
    //% blockId=grove_tm1637_create block="4-Digit Display at|%clkPin|and|%dataPin"
    //% clkPin.fieldEditor="gridpicker" clkPin.fieldOptions.columns=4
    //% group="4-Digit"
    //% clkPin.fieldOptions.tooltips="false" clkPin.fieldOptions.width="250"
    //% dataPin.fieldEditor="gridpicker" dataPin.fieldOptions.columns=4
    //% clkPin.defl=DigitalPin.C16 dataPin.defl=DigitalPin.C17
    //% dataPin.fieldOptions.tooltips="false" dataPin.fieldOptions.width="250"
    //% blockSetVariable=4digit
    export function createDisplay(clkPin: DigitalPin, dataPin: DigitalPin): TM1637
    {
        let display = new TM1637();
        
        display.buf = pins.createBuffer(4);
        display.clkPin = clkPin;
        display.dataPin = dataPin;
        display.brightnessLevel = 0;
        display.pointFlag = false;
        display.clear();
        
        return display;
    }
 
    /**
     * init Grove Gesture modules
     * 
     */
    //% blockId=grove_initgesture block="init gesture"
    //% group="Gesture"
    export function initGesture() {
        if (!paj7620) {
            paj7620.init();
        }
    }

    /**
     * get Grove Gesture model
     * 
     */
    //% blockId=grove_getgesture block="get gesture model"
    //% group="Gesture"
    export function getGestureModel(): number {
        return paj7620.read();
    }
    /**
     * get Joystick key
     * 
     */
    //% blockId=grove_getjoystick block="get joystick key at|%xpin|and|%ypin"
    //% group="Thumbjoystick" xpin.defl=AnalogPin.C16 ypin.defl=AnalogPin.C17
    export function getJoystick(xpin: AnalogPin, ypin: AnalogPin): number {
        return joystick.joyread(xpin, ypin);
    }

   /**
     * Converts the gesture name to a number
     * Useful for comparisons
     */
    //% blockId=ggesture block="%key"
    //% group="Gesture"
    export function ggesture(g: GroveGesture): number {
        return g;
    }
    
    /**
     * Do something when a gesture is detected by Grove - Gesture
     * @param gesture type of gesture to detect
     * @param handler code to run
     */
    //% blockId=grove_gesture_create_event block="on Gesture|%gesture"
    //% group="Gesture"
    export function onGesture(gesture: GroveGesture, handler: () => void) {
        control.onEvent(gestureEventId, gesture, handler);
        paj7620.init();
        control.inBackground(() => {
            while(true) {
                const gesture = paj7620.read();
                if (gesture != lastGesture) {
                    lastGesture = gesture;
                    control.raiseEvent(gestureEventId, lastGesture);
                }
                basic.pause(50);
            }
        })
    }

    /**
     * Converts the key name to a number
     * Useful for comparisons
     */
    //% blockId=joystickkey block="%key"
    //% group="Thumbjoystick"
    export function joystickkey(key: GroveJoystickKey): number {
        return key;
    }

    /**
     * Do something when a key is detected by Grove - Thumb Joystick
     * @param key type of joystick to detect
     * @param xpin
     * @param ypin
     * @param handler code to run
     */
    //% blockId=grove_joystick_create_event block="on Key|%key at |%xpin|and|%ypin"
    //% group="Thumbjoystick" xpin.defl=AnalogPin.C16 ypin.defl=AnalogPin.C17

    export function onJoystick(key: GroveJoystickKey, xpin: AnalogPin, ypin: AnalogPin, handler: () => void) {
        control.onEvent(joystickEventID, key, handler);
        control.inBackground(() => {
            while(true) {
                const key = joystick.joyread(xpin, ypin);
                if (key != lastJoystick) {
                    lastJoystick = key; 
                    control.raiseEvent(joystickEventID, lastJoystick);
                }
                basic.pause(50);
            }
        })
        
    }

    let isWifiConnected = false;
    /**
     * Setup Grove - Uart WiFi V2 to connect to  Wi-Fi
     */
    //% block="Setup Wifi|TX %txPin|RX %rxPin|Baud rate %baudrate|SSID = %ssid|Password = %passwd"
    //% group="UartWiFi"
    //% txPin.defl=SerialPin.P15
    //% rxPin.defl=SerialPin.P1
    //% baudRate.defl=BaudRate.BaudRate115200
    export function setupWifi(txPin: SerialPin, rxPin: SerialPin, baudRate: BaudRate, ssid: string, passwd: string) {
        let result = 0

        isWifiConnected = false

        serial.redirect(
            txPin,
            rxPin,
            baudRate
        )

        sendAtCmd("AT")
        result = waitAtResponse("OK", "ERROR", "None", 1000)

        sendAtCmd("AT+CWMODE=1")
        result = waitAtResponse("OK", "ERROR", "None", 1000)

        sendAtCmd(`AT+CWJAP="${ssid}","${passwd}"`)
        result = waitAtResponse("WIFI GOT IP", "ERROR", "None", 20000)

        if (result == 1) {
            isWifiConnected = true
        }
    }

    /**
     * Check if Grove - Uart WiFi V2 is connected to Wifi
     */
    //% block="Wifi OK?"
    //% group="UartWiFi"
    export function wifiOK() {
        return isWifiConnected
    }

    /**
     * Send data to ThinkSpeak
     */
    //% block="Send Data to your ThingSpeak Channel|Write API Key %apiKey|Field1 %field1|Field2 %field2|Field3 %field3|Field4 %field4|Field5 %field5|Field6 %field6|Field7 %field7|Field8 %field8"
    //% group="UartWiFi"
    //% apiKey.defl="your Write API Key"
    export function sendToThinkSpeak(apiKey: string, field1: number, field2: number, field3: number, field4: number, field5: number, field6: number, field7: number, field8: number) {
        let result = 0
        let retry = 2

        // close the previous TCP connection
        if (isWifiConnected) {
            sendAtCmd("AT+CIPCLOSE")
            waitAtResponse("OK", "ERROR", "None", 2000)
        }

        while (isWifiConnected && retry > 0) {
            retry = retry - 1;
            // establish TCP connection
            sendAtCmd("AT+CIPSTART=\"TCP\",\"iot.rlp.schule\",80")
            result = waitAtResponse("OK", "ALREADY CONNECTED", "ERROR", 2000)
            if (result == 3) continue

            let data = "GET /update?api_key=" + apiKey
            if (!isNaN(field1)) data = data + "&field1=" + field1
            if (!isNaN(field2)) data = data + "&field2=" + field2
            if (!isNaN(field3)) data = data + "&field3=" + field3
            if (!isNaN(field4)) data = data + "&field4=" + field4
            if (!isNaN(field5)) data = data + "&field5=" + field5
            if (!isNaN(field6)) data = data + "&field6=" + field6
            if (!isNaN(field7)) data = data + "&field7=" + field7
            if (!isNaN(field8)) data = data + "&field8=" + field8

            sendAtCmd("AT+CIPSEND=" + (data.length + 2))
            result = waitAtResponse(">", "OK", "ERROR", 2000)
            if (result == 3) continue
            sendAtCmd(data)
            result = waitAtResponse("SEND OK", "SEND FAIL", "ERROR", 5000)

            // // close the TCP connection
            // sendAtCmd("AT+CIPCLOSE")
            // waitAtResponse("OK", "ERROR", "None", 2000)

            if (result == 1) break
        }
    }

    /**
     * Send data to IFTTT
     */
    //% block="Send Data to your IFTTT Event|Event %event|Key %key|value1 %value1|value2 %value2|value3 %value3"
    //% group="UartWiFi"
    //% event.defl="your Event"
    //% key.defl="your Key"
    //% value1.defl="hello"
    //% value2.defl="micro"
    //% value3.defl="bit"
    export function sendToIFTTT(event: string, key: string, value1: string, value2: string, value3: string) {
        let result = 0
        let retry = 2

        // close the previous TCP connection
        if (isWifiConnected) {
            sendAtCmd("AT+CIPCLOSE")
            waitAtResponse("OK", "ERROR", "None", 2000)
        }

        while (isWifiConnected && retry > 0) {
            retry = retry - 1;
            // establish TCP connection
            sendAtCmd("AT+CIPSTART=\"TCP\",\"maker.ifttt.com\",80")
            result = waitAtResponse("OK", "ALREADY CONNECTED", "ERROR", 2000)
            if (result == 3) continue

            let data = "GET /trigger/" + event + "/with/key/" + key
            data = data + "?value1=" + value1
            data = data + "&value2=" + value2
            data = data + "&value3=" + value3
            data = data + " HTTP/1.1"
            data = data + "\u000D\u000A"
            data = data + "User-Agent: curl/7.58.0"
            data = data + "\u000D\u000A"
            data = data + "Host: maker.ifttt.com"
            data = data + "\u000D\u000A"
            data = data + "Accept: */*"
            data = data + "\u000D\u000A"

            sendAtCmd("AT+CIPSEND=" + (data.length + 2))
            result = waitAtResponse(">", "OK", "ERROR", 2000)
            if (result == 3) continue
            sendAtCmd(data)
            result = waitAtResponse("SEND OK", "SEND FAIL", "ERROR", 5000)

            // // close the TCP connection
            // sendAtCmd("AT+CIPCLOSE")
            // waitAtResponse("OK", "ERROR", "None", 2000)

            if (result == 1) break
        }
    }


    function waitAtResponse(target1: string, target2: string, target3: string, timeout: number) {
        let buffer = ""
        let start = input.runningTime()

        while ((input.runningTime() - start) < timeout) {
            buffer += serial.readString()

            if (buffer.includes(target1)) return 1
            if (buffer.includes(target2)) return 2
            if (buffer.includes(target3)) return 3

            basic.pause(100)
        }

        return 0
    }

    function sendAtCmd(cmd: string) {
        serial.writeString(cmd + "\u000D\u000A")
    }
}