main.ts

/**
This is a MakeCode extension for the Grove Keyboard CardKB" of M5Stack.
Further information can be found here: https://docs.m5stack.com/en/unit/cardkb
 */


//% color="#AA278D" weight=200 //% icon="\uf11c"
namespace CardKB {
    let i2cDevice = 95;

    //% block="read charcode" blockId=readCharcode
    export function readCharcode() {
        let charcode: number = 0;
        charcode = pins.i2cReadNumber(i2cDevice, NumberFormat.Int8LE, true)
        return charcode
    }

    //% block="read string" blockId=readString
    export function readString() {
        let charcode: number = 0;
        charcode = pins.i2cReadNumber(i2cDevice, NumberFormat.Int8LE, true)
        if (charcode < 0) {
            return assignSpecialCharacter(charcode)
        } else {
            return String.fromCharCode(charcode)
        }
    }

    function assignSpecialCharacter(negativeCharcode: number) {
        let specialCharacters: string[] = ['esc', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', 'del', 'tab', '{', '}', '[', ']', '/', '\\', '|', '~', "'", '"', '', '', 'shift', ';', ':', '`', '+', '-', '_', '=', '?', '', 'enter', 'sym', '', '', '', '', '', '', '', '', '<', '>', ' '];
        return specialCharacters[128 + negativeCharcode]
    }
}

/**
 * Functions are mapped to blocks using various macros
 * in comments starting with %. The most important macro
 * is "block", and it specifies that a block should be
 * generated for an **exported** function.


enum characterFormat {
    //% block=ASCII
    ascii,
    //% block=Charcode
    charcode
}

//% color="#AA278D" weight=200 //% icon="\uf11c"
namespace CardKB {
    let i2cDevice = 95;

    //% block
    export function readLetter(format: characterFormat) {
        let message = 0;
        message = pins.i2cReadNumber(i2cDevice, NumberFormat.Int8LE, false)
        if (message != 0) {
            if (format == characterFormat.ascii) {
                return String.fromCharCode(message)
            } else if (characterFormat.charcode) {
                return message.toString()
            }
        }
        return ""
    }

}


 */