hiddkeyboardinputreport.h

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

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/**
 \unit HIDDKeyboardInputReport.h

 !!!Purpose

 Class for manipulating HID keyboard input reports.

 !!!Usage

 -# Initialize a newly created input report with
    HIDDKeyboardInputReport_Initialize.
 -# Change the standard keys that are pressed and released using
    HIDDKeyboardInputReport_PressStandardKey and
    HIDDKeyboardInputReport_ReleaseStandardKey.
 -# Change the modifier keys that are currently pressed and released
    using HIDDKeyboardInputReport_PressModifierKey and
    HIDDKeyboardInputReport_ReleaseModifierKey.
*/

#ifndef HIDDKEYBOARDINPUTREPORT_H
#define HIDDKEYBOARDINPUTREPORT_H

//------------------------------------------------------------------------------
//         Definitions
//------------------------------------------------------------------------------

/// Maximum number of simultaneous key presses.
#define HIDDKeyboardInputReport_MAXKEYPRESSES       3

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

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

//------------------------------------------------------------------------------
/// HID input report structure used by the keyboard driver to notify the
/// host of pressed keys.
///
/// The first byte is used to report the state of modifier keys. The
/// other three contains the keycodes of the currently pressed keys.
//------------------------------------------------------------------------------
typedef struct {

    /// State of modifier keys.
    unsigned char bmModifierKeys:8;
    /// Key codes of pressed keys.
    unsigned char pressedKeys[HIDDKeyboardInputReport_MAXKEYPRESSES];

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

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

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
/*
    Function: HIDDKeyboardInputReport_Initialize
        Initializes a keyboard input report instance.

    Parameters:
        report - Pointer to a HIDDKeyboardInputReport instance.
*/
extern void HIDDKeyboardInputReport_Initialize(HIDDKeyboardInputReport *report);

/*
    Function: HIDDKeyboardInputReport_PressStandardKey
        Reports a standard key as being pressed.

    Parameters:
        report - Pointer to a HIDDKeyboardInputReport instance.
        key - Key code of the standard key.
*/
extern void HIDDKeyboardInputReport_PressStandardKey(
    HIDDKeyboardInputReport *report,
    unsigned char key);

/*
    Function: HIDDKeyboardInputReport_ReleaseStandardKey
        Reports a standard key as not being pressed anymore.

    Parameters:
        report - Pointer to a HIDDKeyboardInputReport instance.
        key - Key code of the standard key
*/
extern void HIDDKeyboardInputReport_ReleaseStandardKey(
    HIDDKeyboardInputReport *report,
    unsigned char key);

/*
    Function: HIDDKeyboardInputReport_PressModifierKey
        Reports a modifier key as being currently pressed.

    Parameters:
        report - Pointer to a HIDDKeyboardInputReport instance.
        key - Key code of the modifier key.
*/
extern void HIDDKeyboardInputReport_PressModifierKey(
    HIDDKeyboardInputReport *report,
    unsigned char key);

/*
    Function: HIDDKeyboardInputReport_ReleaseModifierKey
        Reports a modifier key as not being pressed anymore.

    Parameters:
        report - Pointer to a HIDDKeyboardInputReport instance.
        key - Key code of the modifier key.
*/
extern void HIDDKeyboardInputReport_ReleaseModifierKey(
    HIDDKeyboardInputReport *report,
    unsigned char key);

#endif //#ifndef HIDDKEYBOARDINPUTREPORT_H