This Forum is Dedicated For all The Object Oriented PIC Lovers .......... The concept behind OOPic is straight forward. Use preprogrammed multitasking Objects from a library of highly optimized Objects to do all the work of interacting with the hardware. Then write small scripts in Basic, C, or Java syntax styles to control the Objects. During operation, the Objects run continuously and simultaneously in the background while the scripts run in the foreground telling the objects what to do.

Thursday, November 29, 2007

[oopic] Serial communication with negative values

I have an OOPic-R (v5 compiler) communicating with my computer via
the serial port for debugging. All variable types appear with
leading zeros to make 5 digits (ie a value 1 appears as 00001), but
that's fine. The problem occurs when a signed variable with a
negative value is transmitted. The signed value shows up as
(seemingly) random ASCII characters. As an example, a word with
value -29536 appears as ".'+-*" (quotation marks added). Positive
values of signed variables appear correctly. I can solve the problem
by creating a second variable and assigning it the value of the first
plus 32768, 128, or 8 (for word, byte, or nibble variables,
respectively), to make the second variable always have a positive
value. But then I have twice as many variables, more instructions to
execute, and I have to subtract the same values off the value on the
receiving end of the communication. Has anyone had this problem, or
know of a more elegant way to solve it?

Thank you,
Aaron


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