PWMPAL help

davidss

I have tried everything I can think of to get this PWMpal to work with my BS2p24 and it just won't respond. I send it the following program:

SEROUT 0, 6, [noparse][[/noparse]"!PMWGS"]
SERIN 0, 6, [noparse][[/noparse]status]
DEBUG status

and it never gets past the SERIN. Should I be setting all the pins to input mode before this? Does anyone have any clues not mentioned in the manual? I searched this forum and on google and I couldn't find any new ideas.

Thanks for your help.

-DAvid

Jon Williams

The trouble is you need to change the baudrate parameter for the BS2p -- the documentation shows syntax for the BS2.· The correct baud parameter for 38.4K on a BS2p is 45.· Change your serial lines like this:

SEROUT 0, 45, [noparse][[/noparse]"!PWMGS"]

Better yet, add this to the top of your programs that require serial routines:

#SELECT $STAMP
  #CASE BS2, BS2E, BS2PE
    T1200       CON     813
    T2400       CON     396
    T4800       CON     188
    T9600       CON     84
    T19K2       CON     32
    TMidi       CON     12
    T38K4       CON     6
  #CASE BS2SX, BS2P
    T1200       CON     2063
    T2400       CON     1021
    T4800       CON     500
    T9600       CON     240
    T19K2       CON     110
    TMidi       CON     60
    T38K4       CON     45
#ENDSELECT
 
SevenBit        CON     $2000
Inverted        CON     $4000
Open            CON     $8000
 
Baud            CON     T38K4

Then your code becomes...

SEROUT 0, Baud, [noparse][[/noparse]"!PWMGS"]

... and will work with any BS2 module.

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

davidss

OMG THANKYOU SO MUCH!

I have to go try that right now! I just wish I had keys to the lab.

I'll post back my progress later.

Thanks again.

-David

Jon Williams

You're welcome -- and thank you for the post. I just went through the PWMPAL docs to clarify the baudmode values and make sure that the conditional compilation definitions were embedded in the examples.

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA