All,

  I have an application that I need to generate a random number sequence 
for.  Not just a random number, I know how to do that, but an entire 
pseudo random sequence.  The sledge-hammer approach would be to generate 
a random number, see if it is already in the sequence and store it if it 
is new, then generate a new random number.  Early in the process this 
would work OK, but when I need the last four numbers the time required 
to generate the numbers could be excessive to say the least.

The details:
-    The user will have a random number of sound files (2 to 127) on a 
memory card.
-    The PIC will count the number of available files and create a 
random number sequence that is non-repeating and inclusive of all file 
numbers.  (Each file is assigned a number so that I don't need to 
'shuffle' the file names, just the numbers.)  I can skip files numbers 
that are greater than the number available but a sequence that stops at 
the maximum would be nice.
-    The PIC will select the first file number and send the file to a 
player.
-    Once that file is played the PIC will select the next file number 
in the sequence and send it to the player.
-    Once all songs have been played once, the PIC will generate a new 
random sequence and start over.

  Suggestions or pointers are greatly appreciated.

Phil


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