Help with parsing SERIN data

Kevin Harris

I'm using a BS2 to receive coordinate data to drive servos for a color tracking program I've written.· I'm trying to figure out what the best way to send from the computer and receive to the BS2 in one shot an X and Y coordinate, both signed.· I need to formulate a good SERIN statement that can split up one piece of data into two signed coordinates.· I can make my computer send it in any format.· Anyone have any ideas?·· Thanks, Kevin Harris

Jon Williams

Are you planning to send in the Stamp's signed format (16-bit, two's compliment)?· If so, just accept the values as words, sent one byte at a time (usually low byte, then high byte).

· SERIN Sio, Baud, [noparse][[/noparse]xCoord.BYTE0, xCoord.BYTE1, yCoord.BYTE0, yCoord.BYTE1]

If you can send the data as a sting, like:

· "-34, +27"

... then you can do something like this:

· SERIN Sio, Baud, [noparse][[/noparse]SDEC xCoord, SDEC yCoord]

The SDEC modifier converts a signed number sent as a string to a value.· You can add a WAIT modifier for synchronization if you need.· If your string was:

· "Heading = -34, +27"

... then you could do this:

· SERIN Sio, Baud, [noparse][[/noparse]WAIT ("ding ="), SDEC xCoord, SDEC yCoord]

Note that the WAIT string is limited to six characters, hence the truncation.


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Jon Williams
Applications Engineer, Parallax