hiddkeyboardinputreport.c

Atmel的AT91SAM9263芯片的usb HID设备keyboard的源程序

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 *         ATMEL Microcontroller Software Support  -  ROUSSET  -
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/*
    Title: HIDDKeyboardInputReport implementation

    About: Purpose
        Implementation of the HIDDKeyboardInputReport class.
*/

//------------------------------------------------------------------------------
//         Headers
//------------------------------------------------------------------------------

#include "HIDDKeyboardInputReport.h"
#include "HIDDKeyboardDriverDescriptors.h"
#include <utility/assert.h>

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

    Parameters:
        report - Pointer to a HIDDKeyboardInputReport instance.
*/
void HIDDKeyboardInputReport_Initialize(HIDDKeyboardInputReport *report)
{
    unsigned int i;

    report->bmModifierKeys = 0;
    for (i = 0; i < HIDDKeyboardInputReport_MAXKEYPRESSES; i++) {
    
        report->pressedKeys[i] = 0;
    }
}

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

    Parameters:
        report - Pointer to a HIDDKeyboardInputReport instance.
        key - Key code of the standard key.
*/
void HIDDKeyboardInputReport_PressStandardKey(HIDDKeyboardInputReport *report,
                                              unsigned char key)
{
    ASSERT(key <= HIDDKeyboardDriverDescriptors_LASTSTANDARDKEY,
           "Invalid standard key code (%d)\n\r",
           key);

    // Find first available slot
    unsigned int i = 0;
    unsigned char found = 0;
    while ((i < HIDDKeyboardInputReport_MAXKEYPRESSES) && !found) {

        // Free slot: no key referenced (code = 0) or ErrorRollOver
        if ((report->pressedKeys[i] == 0)
            || (report->pressedKeys[i] == HIDKeypad_ERRORROLLOVER)) {

            found = 1;
            report->pressedKeys[i] = key;
        }
        
        i++;
    }

    // Report ErrorRollOver in all fields if too many keys are pressed
    if (!found) {

        for (i=0; i < HIDDKeyboardInputReport_MAXKEYPRESSES; i++) {

            report->pressedKeys[i] = HIDKeypad_ERRORROLLOVER;
        }
    }
}

/*
    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
*/
void HIDDKeyboardInputReport_ReleaseStandardKey(HIDDKeyboardInputReport *report,
                                                unsigned char key)
{
    ASSERT(key <= HIDDKeyboardDriverDescriptors_LASTSTANDARDKEY,
           "Invalid standard key code (%d)\n\r",
           key);

    // Look for key in array
    unsigned int i = 0;
    unsigned char found = 0;
    while ((i < HIDDKeyboardInputReport_MAXKEYPRESSES) && !found) {

        if (report->pressedKeys[i] == key) {

            found = 1;
            report->pressedKeys[i] = 0;
        }

        i++;
    }
}

/*
    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.
*/
void HIDDKeyboardInputReport_PressModifierKey(HIDDKeyboardInputReport *report,
                                              unsigned char key)
{
    ASSERT((key >= HIDDKeyboardDriverDescriptors_FIRSTMODIFIERKEY)
           && (key <= HIDDKeyboardDriverDescriptors_LASTMODIFIERKEY),
           "Invalid standard key code (%d)\n\r",
           key);

    // Set corresponding bit
    unsigned char bit = key - HIDDKeyboardDriverDescriptors_FIRSTMODIFIERKEY;
    report->bmModifierKeys |= 1 << bit;
}

/*
    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.
*/
void HIDDKeyboardInputReport_ReleaseModifierKey(HIDDKeyboardInputReport *report,
                                                unsigned char key)
{
    ASSERT((key >= HIDDKeyboardDriverDescriptors_FIRSTMODIFIERKEY)
           && (key <= HIDDKeyboardDriverDescriptors_LASTMODIFIERKEY),
           "Invalid standard key code (%d)\n\r",
           key);

    // Clear corresponding bit
    unsigned char bit = key - HIDDKeyboardDriverDescriptors_FIRSTMODIFIERKEY;
    report->bmModifierKeys &= ~(1 << bit);
}