matlab生成HEX文件-任意信号 大于64K长度

HEX文件格式不赘述，写里直接放上代码。请批评改正。

 %%convert a signal data into hex file format

 % data format:16bit

 % signal length: less than ^-

 % author: Yang Li [email protected]

 % data:2015.01.

 clear all;

 close all;

 clc;

 %% fixed point or binary16 float point

 fixed=;

 %% generate a signal waveform

 %

 T=;%time length

 fs=1e3;%sample rate

 N=;

 Period=N/fs/;

 f=/Period;

 t=linspace(,(N-)/fs,N);

 %data=:^-;

 data= sin(*pi*f*t) +(rand(,N)-0.5)/;

 % data=mod(*t,);

 % plot(t,data)

 dataBits=;

 byteBits=;

 %% convert into  bits fixed point number

 if fixed ==

     maximum=max(abs(data));%maximum of absolute signal

     scale=(^-)/maximum;%scale

     data=round(data*scale);

     for i=::length(data)

         if data(i) <

             data(i) =^-abs(data(i)) ;

         end

     end

 end

 %% write

 fh=fopen('data.hex','w');%open a new file (file path, file name)

 bytesEveryRow=;%write  bytes every row

 dataEveryRow=bytesEveryRow/(dataBits/byteBits);%number of data every row

 lengthData=length(data);%length of signal data

 rowLengths=ceil(lengthData/dataEveryRow);%number of rows of the file to be written

 for i=:rowLengths % write a row each time

     if(mod(i,hex2dec(''))==)

         baseaddr=dec2hex(floor(i/hex2dec('')),);

         checkSum=+hex2dec(baseaddr(:))+hex2dec(baseaddr(:));

          checkSum=(dec2hex(bitand(-mod(checkSum,),),));

         fprintf(fh,[':02000004',baseaddr,checkSum,,]);%产生HEX码(end-:end)

     end

     checkSum=;

     addr=dec2hex(mod((i-)*,hex2dec('')),);%the start address of this row

     checkSum=hex2dec(addr(:))+hex2dec(addr(:));

     if i*dataEveryRow <lengthData %  numbers of data to be written greater than dataEveryRow

         dataRow=dataEveryRow;

         dataHex='';

         for j=*(i-)+::*(i)

             if fixed == %

                 dataHexCurr=dec2hex(data(j),);% bits fixed point

              else

                 dataHexCurr=num2binary16hex(data(j));%number format: 16bits floatIEEE  half precison float point standard,result is a hex format

              end

             checkSum=checkSum+hex2dec(dataHexCurr(:))+hex2dec(dataHexCurr(:));

             dataHex=strcat(dataHex,dataHexCurr);

         end

     else

          dataHex='';

          dataRow =lengthData-(rowLengths-)*dataEveryRow;

         for j=(rowLengths-)*dataEveryRow+::lengthData

              if fixed == %

                 dataHexCurr=dec2hex(data(j),);% bits fixed point

              else

                 dataHexCurr=num2binary16hex(data(j));%number format: 16bits floatIEEE  half precison float point standard,result is a hex format

              end

             checkSum=checkSum+hex2dec(dataHexCurr(:))+hex2dec(dataHexCurr(:));

             dataHex=strcat(dataHex,dataHexCurr);

         end

     end

    checkSum=checkSum+dataRow*dataBits/byteBits;

     checkSum=(dec2hex(bitand(-mod(checkSum,),),));

 %     disp([num2str(i),'--',dataHex,'--',checkSum])

     fprintf(fh,[':',dec2hex(dataRow*dataBits/byteBits,),addr,'',dataHex,checkSum,,]);%产生HEX码(end-:end)

 end

 fprintf(fh,':00000001FF');

 fclose(fh);

代码中有定点浮点两种，其中浮点格式为IEEE754标准中的half-precision-floating point, 16bit, 1bit 浮号位，5bit指数位，10小数位，代码如下：

 function [ hex ] = num2binary16he( number )

 %The IEEE  standard specifies a binary16 as having the following format:

 %Sign bit:  bit

 %Exponent width:  bits

 %Significand precision:  bits ( explicitly stored)

 %S EEEEE MMMMMMMMMM

 %INPUT: number is a random precision number

 %OUTPUT : var binary is a 's string of the binary16

 %         var decimail is the value of the number in decimal

 %Author :Yang Li .

 %Email: [email protected]

 if real(number) >= ^

     error('beyond the maximum :-2^14--+2^24');

 end

 S=number< ;

 E=;

 M=abs(number);

 while((E>- && E<)&&( M>= || M< ))

     if(M>=)

      E=E+;

      M=M/;

     else

         E=E-;

         M=M*;

     end

 end

 if ((E==- || E==)&& M>= || M<)

     M=;

 else

     M=round((M-)*^) ;

 end

   number1=(-)^S*(^ E   )*(+M/^);

 % binary=strcat(num2str(S),num2str(E),num2str(M))

 E =E+;

 binary=strcat(num2str(S),dec2bin(E,), dec2bin(M,)) ;

 sReal=(str2double(binary()));

 eReal =-;

  for i=:

     eReal=eReal+str2double(binary(i))*^(-i);

  end

 %  eReal=eReal*(-)^str2double(binary());

  mReal = ;

 for i=:

     mReal=mReal+str2double(binary(i))*^(-i);

 end

 numberReal=(-)^sReal*^eReal*(+mReal/^);

 err=num2str(abs(number-numberReal));

 decimal=numberReal;

 % disp(['the origin data is : ',num2str(number)]);

 % disp(['the float format is : ',binary]);

 % disp(['so ,there is a error :',num2str(abs(number-numberReal))]);

 num=;

 for i=:

     num=num+str2double(binary(i))*^(-i);

 end

 hex=dec2hex(num,);

 end