Pwmpal

shank_blue

Can a pwmpal generate a 50% duty cycle waveform. i am using a bs2p. i am wanting to generate a pulse with 5.2ms ontime and 5.2ms offtime.Attached is my code. but the pwmpal does not seem to output aything.

' =========================================================================
'
' File....... PWM_Simple_Motor.BS2
' Purpose.... Simple DC motor control
' Author..... Parallax
' E-mail..... support@parallax.com
' Started....
' Updated.... 29 JUL 2004
'
' {$STAMP BS2p}
' {$PBASIC 2.5}
'
' =========================================================================


'

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[noparse][[/noparse] Program Description ]

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' Demonstrates simple DC motor control with the PWMPAL.

' NOTE: Do NOT connect a DC motor directly to the PWMPAL / Stamp. You
' must use a buffer (transistor, MOSFET, etc.) to switch the current
' required by the motor.


'

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[noparse][[/noparse] Revision History ]

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'

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[noparse][[/noparse] I/O Definitions ]

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PpPin PIN 0 ' PWMPAL Serial I/O
SpdCtrl PIN 8 ' speed button


'

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[noparse][[/noparse] Constants ]

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#SELECT $stamp
#CASE BS2, BS2E, BS2PE
T9600 CON 84
T19K2 CON 32
T38K4 CON 6
#CASE BS2SX, BS2P
T9600 CON 240
T19K2 CON 110
T38K4 CON 45
#CASE BS2PX
T9600 CON 396
T19K2 CON 188
T38K4 CON 84
#ENDSELECT

PpBaud CON T9600

MotorNum CON 1 ' PWMPAL motor output

Yes CON 1 ' for active-high
MinSpeed CON 25 ' minimum DC to spin motor


'

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[noparse][[/noparse] Variables ]

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speed VAR Byte ' speed, 0% to 100%
status VAR Byte ' motor control status

onTime VAR Word ' PWM timing
offTime VAR Word


'

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[noparse][[/noparse] EEPROM Data ]

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'

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[noparse][[/noparse] Initialization ]

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Setup:
SEROUT PpPin, PpBaud, [noparse][[/noparse]"!PWMSS", %00010000]



'

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[noparse][[/noparse] Program Code ]

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Main:

SEROUT PpPin, PpBaud, [noparse][[/noparse]"!PWMM1",104,0,104,0]



GOTO Main
END


Any idea why it is doing this.
Thanks

dandreae

Yes, on page 6 of 16 in the PWMPAL documentation it will give you an example.· Here is a link for the download of the doucmentation:

http://www.parallax.com/Store/Accessories/MotorServoControllers/tabid/160/CategoryID/35/List/0/Level/a/ProductID/67/Default.aspx?SortField=ProductName%2cProductName

The sample codes will support all of the BS2's.

Dave

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Dave Andreae

Parallax Tech Support·