read I/Q data from binary file

1st ques: How can I read from a binary file, byte by byte?? 2nd ques: How can I read from a binary file, 2 bytes at a time??

Answer 1

[Walter Roberson]

fid = fopen('YourFile.bin', 'r');  %for read

data_by_one = fread(fid, '*uint8');  %read it a byte at a time

frewind(fid);        %go back to the beginning

data_by_two = fread(fid, '*uint16');  %read two bytes at a time

frewind(fid);        %go back to the beginning

data_by_two_swapped = fread(fid, '*uint16', 'ieee-be');  %two bytes at a time, big-ended

fclose(fid);

The default for two-byte integers is "little-ended", where the file has PQ where in memory the value would be (256 * Q + P). Reading 'big-ended' would read bytes PQ as representing (256 * P + Q), the way that God intended ;-)