hiddkeyboardoutputreport.h

useful when developer using ARM7 to interface HID devices like USB Keyboard

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/**
 \unit HIDDKeyboardOutputReport

 !!!Purpose

 Definition of a class for manipulating HID keyboard output reports.

 !!!Usage

 -# Initialize a newly-created output report instance with
    HIDDKeyboardOutputReport_Initialize.
 -# Retrieve the status of the three LEDs using
    HIDDKeyboardOutputReport_GetNumLockStatus,
    HIDDKeyboardOutputReport_GetCapsLockStatus and
    HIDDKeyboardOutputReport_GetScrollLockStatus.
*/

#ifndef HIDKEYBOARDOUTPUTREPORT_H
#define HIDKEYBOARDOUTPUTREPORT_H

//------------------------------------------------------------------------------
//         Types
//------------------------------------------------------------------------------

#ifdef __ICCARM__          // IAR
#pragma pack(1)            // IAR
#define __attribute__(...) // IAR
#endif                     // IAR

//------------------------------------------------------------------------------
/// HID output report structure used by the host to control the state of
/// the keyboard LEDs.
/// 
/// Only the first three bits are relevant, the other 5 are used as
/// padding bits.
//------------------------------------------------------------------------------
typedef struct {

    unsigned char numLockStatus:1,      /// State of the num. lock LED.
                  capsLockStatus:1,     /// State of the caps lock LED.
                  scrollLockStatus:1,   /// State of the scroll lock LED.
                  padding:5;            /// Padding bits.

} __attribute__ ((packed)) HIDDKeyboardOutputReport; // GCC

#ifdef __ICCARM__          // IAR
#pragma pack()             // IAR
#endif                     // IAR

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------

extern void HIDDKeyboardOutputReport_Initialize(
    HIDDKeyboardOutputReport *report);

extern unsigned char HIDDKeyboardOutputReport_GetNumLockStatus(
    const HIDDKeyboardOutputReport *report);

extern unsigned char HIDDKeyboardOutputReport_GetCapsLockStatus(
    const HIDDKeyboardOutputReport *report);

extern unsigned char HIDDKeyboardOutputReport_GetScrollLockStatus(
    const HIDDKeyboardOutputReport *report);

#endif //#ifndef HIDKEYBOARDOUTPUTREPORT_H