NLED_SUPPORTS_INFO (Windows Embedded CE 6.0)

1/6/2010

This structure contains information about the capabilities of the specified LED.

Syntax

struct NLED_SUPPORTS_INFO {
  UINT LedNum;
  LONG lCycleAdjust;
  BOOL fAdjustTotalCycleTime;
  BOOL fAdjustOnTime;
  BOOL fAdjustOffTime;
  BOOL fMetaCycleOn;
  BOOL fMetaCycleOff; 
};

Members

• LedNum
  Number of the LED. The first LED is zero (0).

• lCycleAdjust
  Granularity of the cycle-time adjustments, in microseconds.

• fAdjustTotalCycleTime
  TRUE if the LED has an adjustable total cycle time; otherwise, it is FALSE.

• fAdjustOnTime
  TRUE if the LED has a separate on time; otherwise, it is FALSE.

• fAdjustOffTime
  TRUE if the LED has a separate off time; otherwise, it is FALSE.

• fMetaCycleOn
  TRUE if the LED can blink n cycles, pause, and blink n cycles; otherwise, it is FALSE.

• fMetaCycleOff
  TRUE if the LED can blink n cycles, pause n cycles, and blink n cycles; otherwise, it is FALSE.

Remarks

The NLedDriverGetDeviceInfo and NLedDriverSetDevice functions use this structure.

The caller should first get the number of notification LEDs on the system. This is usually 1 but may be zero (0) and could be greater than 1. The caller should fill in the Lednum and then call NLedDriverGetDeviceInfo. LED numbering starts at zero (0).

The lCycleAdjust member is the granularity to which cycle time adjustments can be made. For example if the granularity is 1/16 second, lCycleAdjust equals 62500 microseconds. The minimum on time and off time for blinking can be determined using this value. If the LED does not support blinking, the ICycleAdjust value should be zero (0).** In Windows Embedded CE 6.0 and earlier, a value of -1 has been used to identify the vibrator for most portable device drivers.**

Values are given in microseconds only to deal with computations involving fractional milliseconds. Usually only settings in the milliseconds range are meaningful.

Usually a device will report that it supports up to two of fAdjustTotalCycleTime, fAdjustOnTime, and fAdjustOffTime; any two determine the third.

The following table shows the most likely settings.

Requirements

See Also

Reference

Notification LED Driver Structures
NLedDriverGetDeviceInfo
NLedDriverSetDevice