source: svn/newcon3bcm2_21bu/magnum/portinginterface/kpd/7552/bkpd.h @ 22

/***************************************************************************
 *     Copyright (c) 2003, Broadcom Corporation
 *     All Rights Reserved
 *     Confidential Property of Broadcom Corporation
 *
 *  THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE
 *  AGREEMENT  BETWEEN THE USER AND BROADCOM.  YOU HAVE NO RIGHT TO USE OR
 *  EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT.
 *
 * $brcm_Workfile: bkpd.h $
 * $brcm_Revision: Hydra_Software_Devel/8 $
 * $brcm_Date: 9/15/04 12:06p $
 *
 * Module Description:
 *
 * Revision History:
 *
 * $brcm_Log: /magnum/portinginterface/kpd/7038/bkpd.h $
 * 
 * Hydra_Software_Devel/8   9/15/04 12:06p brianlee
 * PR12504: Added function to allow user to install interrupt callback.
 * 
 * Hydra_Software_Devel/8   9/15/04 11:51a brianlee
 * PR12504: Added function to allow user to install interrupt callback.
 * 
 * Hydra_Software_Devel/8   9/15/04 11:51a brianlee
 * PR12504: Added function to allow user to install interrupt callback.
 * 
 * Hydra_Software_Devel/8   9/15/04 11:50a brianlee
 * PR12504: Added function to allow user to install interrupt callback.
 * 
 * Hydra_Software_Devel/7   11/6/03 4:09p lseverin
 * updated module overview for DocJet format
 * 
 * Hydra_Software_Devel/6   10/1/03 11:41a brianlee
 * Fixed sample code.
 * 
 * Hydra_Software_Devel/5   9/25/03 12:05p brianlee
 * Fixed tags for Midas service generator.
 * 
 * Hydra_Software_Devel/4   9/23/03 11:40a brianlee
 * Added polling option.
 * 
 * Hydra_Software_Devel/3   8/20/03 5:13p brianlee
 * Added error code for BKPD_Read if there's no key press.
 * 
 * Hydra_Software_Devel/2   7/31/03 6:02p brianlee
 * Added GetEventHandle() function.
 * 
 * Hydra_Software_Devel/1   7/25/03 11:27a brianlee
 * Initial version.
 * 
 ***************************************************************************/


/*= Module Overview *********************************************************
<verbatim>

Overview
The KPD PI module controls the keypad controller within the BCM7038-B0.  The
keypad controller (along with the LED controller) is not available in the
BCM7038-A0 version.

Design
The design for BKPD PI API is broken into three parts.

o Part 1 (open/close/configuration):

  These APIs are used for opening and closing BKPD device.
    
o Part 2 (wait for key press):

  These APIs are used to scan for key presses.

o Part 3 (get the data):

  These APIs are used to read the data from the keypad.

Usage
The usage of BKPD involves the following:

  * Configure/Open of BKPD

    * Configure BKPD device for the target system
    * Open BKPD device

  * Wait for key press

  * Read the data

Sample Code
void main( void )
{
    BKPD_Handle                         hKPD;
    BKPD_Settings                       defSettings;
    BREG_Handle                         hReg;
    BCHP_Handle                         hChip;
    BINT_Handle                         hInt;
    bool                                        keyReady = FALSE;
    uint16_t                            key;

    // Do other initialization, i.e. for BREG, BCHP, etc.

    // Now, ready to setup the BKPD
    BKPD_GetDefaultSettings( &defSettings, hChip );

    // Make any changes required from the default values
    defSettings.prescale = 0x60;
    defSettings.debounce = 0x40;

    BKPD_Open (&hKPD, hChip, hReg, hInt, &defSettings);

    // Wait for a key to be hit
    do
    {
        BKPD_IsDataReady (hKPD, &keyReady);
    }   
    while (keyReady == FALSE);

    // key is now ready, go read it
    BKPD_Read (hKPD, &key);

}

</verbatim>
***************************************************************************/


#ifndef BKPD_H__
#define BKPD_H__

#include "bchp.h"
#include "breg_mem.h"
#include "bint.h"
#include "bkni.h"
#include "berr_ids.h"

#ifdef __cplusplus
extern "C" {
#endif

/***************************************************************************
Summary:
        Error Codes specific to BKPD

Description:

See Also:

****************************************************************************/
#define BKPD_ERR_NO_KEY                         BERR_MAKE_CODE(BERR_KPD_ID, 0)  /* no key press */

/***************************************************************************
Summary:
        The handle for kpd module.

Description:

See Also:
        BKPD_Open()

****************************************************************************/
typedef struct BKPD_P_Handle                            *BKPD_Handle;

/***************************************************************************
Summary:
        Required default settings structure for KPD module.

Description:
        The default setting structure defines the default configure of
        KPD when the device is opened.  

See Also:
        BKPD_Open()

****************************************************************************/
typedef struct BKPD_Settings
{
   uint32_t                     prescale;               /* 27mhz clock prescale value */
   uint8_t                      debounce;               /* debounce count */
   bool                         intMode;                /* interrupt enable */
} BKPD_Settings;


/***************************************************************************
Summary:
        Callback function for BKPD

Description:
        The callback function is registered by the caller.  It gets called
        when KPD interrupt happens.

See Also:
        BKPD_InstallInterruptCallback()

****************************************************************************/
typedef void (*BKPD_CallbackFunc)( void *pParm1, int parm2, void *pKPD_data);

/***************************************************************************
Summary:
        Callback info structure

Description:
        This is the callback information structure.  Caller registers this
        information with module to be called at interrupt time.

See Also:
        BKPD_InstallInterruptCallback()

****************************************************************************/
typedef struct BKPD_CallbackInfo
{
        BKPD_CallbackFunc cbFunc ;
        void              *pParm1 ;
        int               parm2 ;
} BKPD_CallbackInfo;


/***************************************************************************
Summary:
        This function opens KPD module.

Description:
        This function is responsible for opening BKPD module. When BKPD is
        opened, it will create a module handle and configure the module based
        on the default settings. Once the device is opened, it must be closed
        before it can be opened again.

Returns:
        TODO:

See Also:
        BKPD_Close()
        BKPD_GetDefaultSettings()

****************************************************************************/
BERR_Code BKPD_Open(
        BKPD_Handle *pKPD,                                      /* [out] Returns handle */
        BCHP_Handle hChip,                                      /* [in] Chip handle */
        BREG_Handle hRegister,                          /* [in] Register handle */
        BINT_Handle hInterrupt,                         /* [in] Interrupt handle */
        const BKPD_Settings *pDefSettings       /* [in] Default settings */
        );

/***************************************************************************
Summary:
        This function closes KPD module.

Description:
        This function is responsible for closing BKPD module. Closing BKPD 
        will free main BKPD handle. 

Returns:
        TODO:

See Also:
        BKPD_Open()

****************************************************************************/
BERR_Code BKPD_Close(
        BKPD_Handle hDev                                        /* [in] Device handle */
        );

/***************************************************************************
Summary:
        This function returns the default settings for KPD module.

Description:
        This function is responsible for returns the default setting for 
        BKPD module. The returning default setting should be when
        opening the device.

Returns:
        TODO:

See Also:
        BKPD_Open()

****************************************************************************/
BERR_Code BKPD_GetDefaultSettings(
        BKPD_Settings *pDefSettings,            /* [out] Returns default setting */
        BCHP_Handle hChip                                       /* [in] Chip handle */
        );

/***************************************************************************
Summary:
        This function checks for a key press

Description:
        This function is used to check for a key press.
                
Returns:
        TODO:

See Also:
        

****************************************************************************/
BERR_Code BKPD_IsDataReady ( 
        BKPD_Handle             hKpd,                   /* [in] Device handle */
        bool                            *ready                  /* [out] flag indicating key is pressed */
        );

/***************************************************************************
Summary:
        This function reads the data from the keypad.

Description:
        This function is used to get the key that was pressed.
                
Returns:
        BKPD_ERR_NO_KEY if there is no key press.

See Also:
        

****************************************************************************/
BERR_Code BKPD_Read ( 
        BKPD_Handle             hKpd,                   /* [in] Device handle */
        uint16_t                        *pData                  /* [out] pointer to data read from keypad */
        );

/***************************************************************************
Summary:
        This function installs user-specified interrupt callback function

Description:
        This function is used to install an interrupt callback function.
                
Returns:
        BERR_SUCCESS

See Also:
        

****************************************************************************/
BERR_Code BKPD_InstallInterruptCallback (
        BKPD_Handle             hKpd,                   /* [in] Device handle */
        BKPD_CallbackFunc       callback,               /* [in] callback function */
        void                            *pParm1,                /* [in] application specified parameter */
        int                                     parm2                   /* [in] application specified parameter */
);

/***************************************************************************
Summary:
        This function uninstalls user-specified interrupt callback function

Description:
        This function is used to uninstall an interrupt callback function.
                
Returns:
        BERR_SUCCESS

See Also:
        

****************************************************************************/
BERR_Code BKPD_UnInstallInterruptCallback (
        BKPD_Handle             hKpd                    /* [in] Device handle */
);

/***************************************************************************
Summary:
        This function gets the event handle for BKPD module.

Description:
        This function is responsible for getting the event handle. The
        application code should use this function get BKPD's event handle, 
        which the application should use to pend on.  The KPD ISR will 
        set the event.
        
Returns:
        TODO:

See Also:

****************************************************************************/
BERR_Code BKPD_GetEventHandle(
        BKPD_Handle             hKpd,                   /* [in] Device handle */
        BKNI_EventHandle        *phEvent                /* [out] Returns event handle */
        );

#ifdef __cplusplus
}
#endif
 
#endif