PWM Control Codes

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This topic lists the IOCTLs for Pulse Width Modulation.

In this section

Topic	Description
IOCTL_PWM_CONTROLLER_GET_ACTUAL_PERIOD	Retrieves the effective output signal period of the Pulse Width Modulation (PWM) controller as it would be measured on its output channels.
IOCTL_PWM_CONTROLLER_GET_INFO	Retrieves information about a Pulse Width Modulation (PWM) controller. This information does not change after the controller is initialized.
IOCTL_PWM_CONTROLLER_SET_DESIRED_PERIOD	Sets the output signal period of a Pulse Width Modulation (PWM) controller to a suggested value.
IOCTL_PWM_PIN_GET_ACTIVE_DUTY_CYCLE_PERCENTAGE	Retrieves the current duty cycle percentage for a pin or channel. The control code returns the percentage as a PWM_PIN_GET_ACTIVE_DUTY_CYCLE_PERCENTAGE_OUTPUT structure.
IOCTL_PWM_PIN_SET_ACTIVE_DUTY_CYCLE_PERCENTAGE	Set a desired duty cycle percentage value for the controller pin or channel. The control code specifies the percentage as a PWM_PIN_SET_ACTIVE_DUTY_CYCLE_PERCENTAGE_INPUT structure.
IOCTL_PWM_PIN_GET_POLARITY	Retrieves the current signal polarity of the pin or channel. The control code gets the signal polarity as a PWM_PIN_GET_POLARITY_OUTPUT structure. The signal polarity is either Active High or Active Low, as defined in the PWM_POLARITY enumeration.
IOCTL_PWM_PIN_SET_POLARITY	Sets the signal polarity of the pin or channel. The control code sets the signal polarity based on a PWM_PIN_SET_POLARITY_INPUT structure. The signal polarity is either Active High or Active Low, as defined in the PWM_POLARITY enumeration.
IOCTL_PWM_PIN_START	Starts generation of Pulse Width Modulation (PWM) signal on a pin or channel. To check whether a pin is started, use IOCTL_PWM_PIN_IS_STARTED.
IOCTL_PWM_PIN_STOP	Stops generation of Pulse Width Modulation (PWM) signal on a pin or channel. To check whether a pin is started, use IOCTL_PWM_PIN_IS_STARTED.
IOCTL_PWM_PIN_IS_STARTED	Retrieves the state of signal generation for a pin or channel. Each pin has a state of started or stopped as a PWM_PIN_IS_STARTED_OUTPUT structure.