adding a second stop bit to serout?

Steel · 2007-05-14 16:57

Could anybody help me add a second stop bit to the serout function? Can it be done in·sxb, or does it need to be done in Assembly?

I can't find anything in the SEROUT in·the help file.

Thanks.
Shaun·

JonnyMac · 2007-05-14 18:43

The standard SEROUT uses 8N1; that said, an additional stop bit can be added after your SEROUT by using PAUSEUS for the required bit time. Here's a way to encapsulate SEROUT into a subroutine (which saves code space) and specify the number of stop bits (0 or 1 input will still give one stop bit):

SUB TX_BYTE
  tmpB1 = __PARAM1
  IF __PARAMCNT = 2 THEN
    tmpB2 = __PARAM2
    IF tmpB2 > 0 THEN
      DEC tmpB2
    ENDIF
  ELSE
    tmpB2 = 0
  ENDIF
  SEROUT TX, Baud, tmpB1
  DO WHILE tmpB2 > 0
    PAUSEUS BitTime
    DEC tmpB2
  LOOP
  ENDSUB

Of course, you'll need a PIN definition for TX, and CONstant definitions for Baud and BitTime. Use this declaration:

TX_BYTE        SUB    1, 2

You may want to use the MAX operator to limit the maximum number of additional stop bits.

Post Edited (JonnyMac) : 5/14/2007 7:33:13 PM GMT

Steel · 2007-05-14 19:12

Thanks jonnymac.· I was going to do Pauseus, but I guess I just needed to make sure I wasn't missing anything.

Thanks for the help!

Shaun

adding a second stop bit to serout?

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