串口协议
问卷调查表-后印象派
2023年2月21日发(作者：必应输入法官网)android串⼝通信以及串⼝协议解析
2.协议解析
[java]
1.
1./**
2.*读取终端设备数据
3.*@authorAdministrator
4.*/
eclassReadThreadextendsThread{
6.
7.@Override
voidrun(){
();
10.
11.//定义⼀个包的最⼤长度
Length=2048;
[]buffer=newbyte[maxLength];
14.//每次收到实际长度
ilable=0;
16.//当前已经收到包的总长度
rentLength=0;
18.//协议头长度4个字节（开始符1，类型1，长度2）
derLength=4;
20.
(!isInterrupted()){
{
ble=ble();
(available>0){
25.//防⽌超出数组最⼤长度导致溢出
(available>maxLength-currentLength){
ble=maxLength-currentLength;
28.}
(buffer,currentLength,available);
tLength+=available;
31.}
32.
33.}
(Exceptione){
tackTrace();
36.}
37.
sor=0;
39.//如果当前收到包⼤于头的长度，则解析当前包
(currentLength>=headerLength){
41.//取到头部第⼀个字节
(buffer[cursor]!=0x0F){
43.--currentLength;
44.++cursor;
ue;
46.}
47.
tentLenght=parseLen(buffer,cursor,headerLength);
49.//如果内容包的长度⼤于最⼤内容长度或者⼩于等于0，则说明这个包有问题，丢弃
(contentLenghtmaxLength-5){
tLength=0;
;
53.}
54.//如果当前获取到长度⼩于整个包的长度，则跳出循环等待继续接收数据
tPackLen=contentLenght+5;
(currentLength ; 58.} 59. 60.//⼀个完整包即产⽣ 61.//proceOnePacket(buffer,i,factPackLen); Received(buffer,cursor,factPackLen); tLength-=factPackLen; +=factPackLen; 65.} 66.//残留字节移到缓冲区⾸ (currentLength>0&&cursor>0){ opy(buffer,cursor,buffer,0,currentLength); 69.} 70.} 71.} 72.} 73. 74./** 75.*获取协议内容长度 76.*@paramheader 77.*@return 78.*/ intparseLen(bytebuffer[],intindex,intheaderLength){ 80. 81.//if(-index 81.//if(-index =buffer[index+2]; =buffer[index+3]; =0; (((a>>7)&0x1)==0x1){ =(((a&0x7f)<<8)|b); 87.} { []tmp=newchar[2]; [0]=(char)a; [1]=(char)b; s=newString(tmp,0,2); =nt(s,16); 94.} 95. rlt; 97.} 98. tedvoidonDataReceived(finalbyte[]buffer,finalintindex,finalintpacklen){ n("收到信息"); []buf=newbyte[packlen]; opy(buffer,index,buf,0,packlen); tance(myHandler).analyze(buf); 104.} 105.