lh7a400_evb_ssp_frame_driver.c

sharp的arm920t 7A400的评估板附带光盘Sharp KEVLH7A400 v0.3b Welcome to the SHARP KEV7A400 Evaluation board

/**********************************************************************
 *	$Workfile:   lh7a400_evb_ssp_frame_driver.c  $
 *	$Revision:   1.4  $
 *	$Author:   FergisJ  $
 *	$Date:   Aug 28 2002 08:48:58  $
 *
 *	Project: LH79520 and eval board test
 *
 *	Description:
 *  This file contains driver support for the Synchronous
 *  Serial Port (SSP) frame control logic on the LH7A400 evb.
 *     
 *  Functions provided are:
 *   lh7a400_evb_ssp_frame_expansion()
 *   lh7a400_evb_ssp_frame_eeprom()
 *   lh7a400_evb_ssp_frame_touchscreen()
 *
 *	References:
 *
 *	Revision History:
 *	$Log:   //smaicnt2/pvcs/VM/CHIPS/archives/LH7A400/SSP/Drivers/lh7a400_evb_ssp_frame_driver.c-arc  $
 * 
 *    Rev 1.4   Aug 28 2002 08:48:58   FergisJ
 * For EVB Rev.02:  added LH7A400_EVB_SSP_K3_GPIO definition.  Updated useage of LH7A400_EVB_SSP_K1_GPIO in eeprom() and touchscreen() functions.
 * 
 *    Rev 1.3   Aug 21 2002 16:30:28   FergisJ
 * Updated LH7A400_EVB_SSP_NTOUCHEN_EEEN #define for Rev.02 EVB
 * 
 *    Rev 1.2   Nov 20 2001 11:31:08   KovitzP
 * Added block function comments
 * 
 *    Rev 1.1   Nov 14 2001 09:01:44   KovitzP
 * Modified include hierarchy
 * 
 *    Rev 1.0   Nov 12 2001 13:32:08   KovitzP
 * Initial revision.
 * 
 * 
 *	COPYRIGHT (C) 2001 SHARP MICROELECTRONICS OF THE AMERICAS, INC.
 *		CAMAS, WA
 *********************************************************************/
#include "LH7A400_evb_ssp_frame_driver.h"

/* definitions for Port-A signals as of EVB Rev.02 */
#define LH7A400_EVB_SSP_K3_GPIO       _BIT(3)
#define LH7A400_EVB_SSP_NTOUCHEN_EEEN _BIT(2)
#define LH7A400_EVB_SSP_K1_GPIO       _BIT(1)

/**********************************************************************
*
* Function: lh7a400_evb_ssp_frame_expansion
*
* Purpose:
*  set up logic on the evaluation board so that when the LH7A400 SSP
*  asserts SSPFRM, neither the EEPROM chip select nor the touchscreen
*  chip select are asserted.
*
* Processing:
*  This function programs the appropriate GPIO ports.
*
* Parameters: None
*
* Outputs: None
*
* Returns: Nothing
*
* Notes:
*  On the first revision of the EVB, this function has the same
*  effect as the the lh7a400_evb_ssp_frame_eeprom.
*
**********************************************************************/
void lh7a400_evb_ssp_frame_expansion(void)
{
   GPIO->padr |= LH7A400_EVB_SSP_NTOUCHEN_EEEN;
   GPIO->padr &= ~LH7A400_EVB_SSP_K1_GPIO;
   GPIO->paddr |= LH7A400_EVB_SSP_NTOUCHEN_EEEN | 
                  LH7A400_EVB_SSP_K1_GPIO;
}

/**********************************************************************
*
* Function: lh7a400_evb_ssp_frame_eeprom
*
* Purpose:
*  set up logic on the evaluation board so that when the LH7A400 SSP
*  asserts SSPFRM, the EEPROM chip select is asserted
*
* Processing:
*  This function programs the appropriate GPIO ports.
*
* Parameters: None
*
* Outputs: None
*
* Returns: Nothing
*
* Notes: None
*
**********************************************************************/
void lh7a400_evb_ssp_frame_eeprom(void)
{
   GPIO->padr |= LH7A400_EVB_SSP_NTOUCHEN_EEEN;
   GPIO->padr &= (~LH7A400_EVB_SSP_K3_GPIO);
   GPIO->paddr |= LH7A400_EVB_SSP_NTOUCHEN_EEEN | 
                  LH7A400_EVB_SSP_K3_GPIO;
}

/**********************************************************************
*
* Function: lh7a400_evb_ssp_frame_touchscreen
*
* Purpose:
*  set up logic on the evaluation board so that when the LH7A400 SSP
*  asserts SSPFRM, the touchscreen controller chip select is asserted
*
* Processing:
*  This function programs the appropriate GPIO ports.
*
* Parameters: None
*
* Outputs: None
*
* Returns: Nothing
*
* Notes: None
*
**********************************************************************/
void lh7a400_evb_ssp_frame_touchscreen(void)
{
   GPIO->padr &= ~(LH7A400_EVB_SSP_NTOUCHEN_EEEN);
   GPIO->paddr |= LH7A400_EVB_SSP_NTOUCHEN_EEEN;
}