matlab实时接收uart数据画图.pdf

comPortInstrcallback.m文件内容 functioncomPortInstrcallback(obj,event) %数据包协议解析部分 globalRecordBuffer,ReacordValid=0; DataByteLen=17000;%中断缓存字节长度 ValidWaveLen=1000;%波形数据的长度 RecordLen=17; %uartDataBuf=zeros(1,DataByteLen,uint8); %x =zeros(2,3,int8); uartCurDataBuf=fread(obj,DataByteLen,uint8); WaveDataBuf=zeros(1,ValidWaveLen,uint32); %接收的数据不够一包数据的 if(ReacordValid0) tempBuf=zero(1,ReacordValid,uint8); fori=1:ReacordValid tempBuf(i)=RecordBuffer(i); end uartDataBuf=[tempBuf;uartCurDataBuf];%组合数组 else uartDataBuf=[uartCurDataBuf]; end j=1; k=0; fori=1:DataByteLen if(uartDataBuf(i) ==255uartDataBuf(i+1)==255) %查找包头 if(DataByteLen-i=(RecordLen-1) ) WaveDataBuf(j)=65536*uartDataBuf(i+2)+256*uartDataBuf(i+3)+uartDataBuf(i+4); j=j+1; else fork=1:(DataByteLen-i) RecordBuffer(k)=uartDataBuf(i+k); end break; end end end if(k0) ReacordValid=k; else ReacordValid=0; end plot(WaveDataBuf,r),gridon; Instrcallback.m文件修改的内容 instrcallback.m原路径在x:\Program Files\MATLAB\R2008a\toolbox\matlab\iofun\@instrument 需要在原路径中更改文件，复制到程序目录是不能使用的 functioninstrcallback(obj,event) comPortInstrcallback(obj,event);%添加的代码 %INSTRCALLBACKDisplayeventinformationfortheevent. % % INSTRCALLBACK(OBJ, EVENT) displaysamessage whichcontainsthe % typeoftheevent,thetime oftheeventandthename ofthe % objectwhichcausedtheeventtooccur. % % If anerrorevent occurs,theerror message isalsodisplayed. % If apinevent occurs,thepinthatchangedvalueandthepin % valueisalsodisplayed. % % INSTRCALLBACK isanexamplecallbackfunction.Usethiscallback % functionasatemplateforwritingyourowncallbackfunction. % % Example: % s=serial(COM1); % set(s,OutputEmptyFcn, {instrcallback}); % fopen(s); % fprintf(s, *IDN?, async); % idn=fscanf(s); % fclose(s); % delete(s); % % MP2-24-00 %