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pwm_set

int pwm_set( int channel, int duty_cycle, int options );

Description

Sets a duty cycle for one of the pulse width modulation (PWM) channels. The duty cycle can be a value from 0 to 1024, where 0 is logic low the whole time, and 1024 is logic high the whole time. Option flags are used to enable features on an individual PWM channel. Bit masks for these are:

• PWM_SPREAD - sets pulse spreading. The duty cycle is spread over four separate pulses to increase the pulse frequency.

• PWM_OPENDRAIN - sets the PWM output pin to be open-drain instead of a normal push-pull logic output.

This function is intended for use with the Rabbit 3000 and Rabbit 4000.

Parameters

channel

channel(0 to 3)

duty_cycle

value from 0 to 1024

options

combination of optional flags (see above)

Return Value

 0: Success.
-1: Error, an invalid channel number is used.
-2: Error, requested duty_cycle is invalid.

Library

PWM.LIB (was in R3000.LIB prior to DC 10)