const { SerialPort } = require('serialport')
const { ByteLengthParser } = require('@serialport/parser-byte-length')
const port = new SerialPort({ path: 'COM5', baudRate: 115200 })
const parser = port.pipe(new ByteLengthParser({ length: 12 }))


// 切片

const sliceTo55 = (buffer) => {
    const num = buffer.indexOf(0x55)
    if (num === 0) {
        const newBuffer = buffer.slice(num, num + 11)
        if (newBuffer[1] === 0x50) {
            const time = `${newBuffer[2].toString()}年${newBuffer[3].toString()}月${newBuffer[4].toString()}日 ${newBuffer[5].toString()}:${newBuffer[6].toString()}:${newBuffer[7].toString()}`
            console.log('时间', time);
        } else if (newBuffer[1] === 0x58) {
            const gps = `${((newBuffer[9] << 24) | (newBuffer[8] << 16) | (newBuffer[7] << 8) | (newBuffer[6])) / 1000}`
            console.log('GPS地速', gps);
        } else if (newBuffer[1] === 0x51) {
            const C = `${(newBuffer[9] << 8 | newBuffer[8]) / 100}`
            console.log('温度', C);
        } else if (newBuffer[1] === 0x53) {
            const P = `${(newBuffer[9] << 8 | newBuffer[8])}`
            console.log('版本号', P);
        } else if (newBuffer[1] === 0x53) {
            const P = `${(newBuffer[9] << 8 | newBuffer[8])}`
            console.log('版本号', P);
        }

    }
}


parser.on('data', data => {
    sliceTo55(data)
})