In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mlablan1 wrote:

OK, I am determined to get this to work !
 

I purchased the Parallax USB Oscilloscope and have taken some measurements that I need help intrepreting.

 

I am enclosing a bitmap of the screen capture from the O-scope software.

 

I am pretty sure the Palm Keyboard that I am trying to decode from sends multiple characters for one key press.  As such, I can't really figure out where the boundaries of the unique byte sets start and finish.

 

I used the horizontal and vertical cursors of the O-scope software and I think I have determined that the baud rate is about 10K, but if somenone can confirm that for me please do so.  Also, the individual bits are negative rather than positive.  Am I looking at this correctly?  Should the MAX3100 chip be able to understand this?

 

Finally, how can I determine where the start bit is within this stream?  What I ultimately need is the specifications to send to the MAX3100 chip so that it can properly decode the incoming IRDA from the Palm keyboard.

 

I was thinking that the MAX3100 chip should take care of this, but it is not handling it at this time.

 

So, if anyone can take a look at this picture and help me intrepret the data, that would be much appreciated.

 

Best regards,

 

Mike

Saratoga Springs, NY

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