pwm.h header
This header is used by System Services. For more information, see:
pwm.h contains the following programming interfaces:
IOCTLs
| 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_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_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. |
| 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_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. |
Structures
| PWM_CONTROLLER_INFO Represents the static information that characterizes a Pulse Width Modulation (PWM) controller. |
| PWM_CONTROLLER_SET_DESIRED_PERIOD_INPUT Contains an input value for a suggested signal period for the Pulse Width Modulation (PWM) controller. |
| PWM_CONTROLLER_SET_DESIRED_PERIOD_OUTPUT Contains the effective output signal period of the Pulse Width Modulation (PWM) controller. |
| PWM_PIN_SET_POLARITY_INPUT Contains a desired value for polarity of a pin or channel. |
Enumerations
| PWM_POLARITY Represents the Pulse Width Modulation (PWM) signal level polarity with respect to the duty cycle. |