package com.hdl.sdk.ttl.HDLDeviceManger.Core;
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import com.hdl.sdk.ttl.Config.MCUConstants;
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/**
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* Created by JLChen on 2019/7/12
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*/
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public class MCUCrc {
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public byte[] addBytes;
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public int mcuCommand = 0;
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public MCUCrc(int command, byte[] addBytes) {
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this.mcuCommand = command;
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this.addBytes = addBytes;
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}
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/**
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* 魔镜MCU协议
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* @return
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*/
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public byte[] getMCUSendBytes() {
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byte[] sendBytes = new byte[5 + this.addBytes.length];
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//Boot code
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sendBytes[0] = (byte) MCUConstants.MCU_BOOT_HEAD;
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sendBytes[1] = (byte) mcuCommand;
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sendBytes[2] = (byte) ((this.addBytes.length) / 256); //数据长度：去除引导头的长度
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sendBytes[3] = (byte) ((this.addBytes.length) % 256); //数据长度：去除引导头的长度
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System.arraycopy(this.addBytes, 0, sendBytes, 4, this.addBytes.length);
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sendBytes[sendBytes.length-1] = getMcuChecksum(sendBytes); //设置校验码
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return sendBytes;
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}
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/**
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* 校验码计算
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* @param packet
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* @return
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* 头引导码和尾校验码不检验 所以i=1，开始 i < (packet.length - 2)
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*/
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public static byte getMcuChecksum(byte[] packet)
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{
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byte mSum = 0;
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for(int i = 0; i < (packet.length - 1); i++)
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{
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mSum += (byte)packet[i];
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}
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mSum = (byte) ((~mSum) + 1);
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return mSum;
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}
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}
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