MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuale Utente Scaricare il pdf (Pagina 366)

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101

8 Serial Port I/O

8-46

fopen(s)

4. Write and read data – Configure the scope to transfer the screen display as

a bitmap.

fprintf(s,'HARDCOPY:PORT RS232')

fprintf(s,'HARDCOPY:FORMAT BMP')

fprintf(s,'HARDCOPY START')

Wait until all the data is sent to the input buffer, and then transfer the data to

the MATLAB workspace as unsigned 8-bit integers.

out = fread(s,s.BytesAvailable,'uint8');

5. Disconnect and clean up – When you no longer need s, you should

disconnect it from the instrument, and remove it from memory and from the

MATLAB workspace.

fclose(s)

delete(s)

clear s

Viewing the Bitmap Data

To view the bitmap data, you should follow these steps:

1 Open a disk file.

2 Write the data to the disk file.

3 Close the disk file.

4 Read the data into MATLAB using the imread function.

5 Scale and display the data using the imagesc function.

Note that the file I/O versions of the

fopen, fwrite, and fclose functions are

used.

fid = fopen('test1.bmp','w');

fwrite(fid,out,'uint8');

fclose(fid)

a = imread('test1.bmp','bmp');

imagesc(a)

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuale Utente Pagina 366

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