at49bv162_driver.c

flash AM29LV160 的驱动程序

/*
 * File       : AT49BV162_Driver.c
 * Description: This file contains the Flash driver for use in ZiLOG File System
 * Author     :  
 * Created on : 04-OCT-2004
 *
 * Copyright 2004 ZiLOG Inc.  ALL RIGHTS RESERVED.
 *
 * This file contains unpublished confidential and proprietary information
 * of ZiLOG, Inc.
 * NO PART OF THIS WORK MAY BE DUPLICATED, STORED, PUBLISHED OR DISCLOSED 
 * IN ANY FORM WITHOUT THE PRIOR WRITTEN CONSENT OF ZiLOG, INC.
 * This is not a license and no use of any kind of this work is authorized
 * in the absence of a written license granted by ZiLOG, Inc. in ZiLOG's 
 * sole discretion 
 */

#include <stdio.h>
#include <string.h>
#include "AT49BV162_Driver.h"


// The driver uses hte configuration of 0x00 which specifies 
// NO PRODUCT IDENTIFICATION EXIT is necessary. The device itself will issue 
// the PRODUCT IDENTIFICATION EXIT command after the PROGRAM OR ERASE 
// operation is carried out and the device is put in the READ ARRAY mode.

INT AT49BV162_Init(  void *paddr, UINT32 num_bytes   )
#ifdef _IAR_CODE
@ "DATA_PER_RAM"
#endif
{
	volatile UINT8 *addr = ( UINT8 * ) ( ( UINT32 ) paddr & AT49BV162_MASK_BITS ) ;
	volatile UINT8 dev_code=0, man_code =0;

	// the address passed is the base address of the flash.
	// Setup PRODUCT_IDENTIFICATION_ENTRY MODE
	*( addr + 0xAAA ) = FLASH_CODE_AA ;
	*( addr + 0x554 ) = FLASH_CODE_55 ;
	*( addr + 0xAAA ) = ID_IN_CODE  ;

	// get the manufacturer code and device code
	man_code = *addr ;
	dev_code = *(addr + 2 ) ;

	// the address passed is the base address of the flash.
	// Setup PRODUCT_IDENTIFICATION_EXIT MODE
	*( addr + 0xAAA ) = FLASH_CODE_AA ;
	*( addr + 0x554 ) = FLASH_CODE_55 ;
	*( addr + 0xAAA ) = ID_OUT_CODE  ;

	// print the manufacturer code and device code
	printf("\n Manufacturer code : 0x%X", man_code ) ;
	if( dev_code  == ATM_ID_BV162A_163A )
	{
		printf("\nDevice Id: AT49BV162/163A") ;
	}
	else if( dev_code == ATM_ID_BV162AT_163AT )
	{
		printf("\nDevice Id: AT49BV162T/163AT") ;
	}
	else
	{
		printf("\nUnknown device" ) ;
	}

	return SUCCESS ;
}

INT32 AT49BV162_Read( void *paddr, void *pbuf, UINT num_bytes )
#ifdef _IAR_CODE
@ "DATA_PER_RAM"
#endif
{
	UINT nbytes ;
	UINT8 *pcbuf = ( UINT8 * ) pbuf ;
	UINT8 *pcaddr = ( UINT8 * ) paddr ;

	// By default the device is in READ ARRAY mode, just copy the
	// contents from the device to the appropraite memory location.
	for( nbytes = 0 ; nbytes < num_bytes ; nbytes++ )
	{
		*pcbuf = *pcaddr ;
		pcbuf++ ;
		pcaddr++ ;
	}

	return num_bytes ;
}

INT32 AT49BV162_Write( void *paddr, void *pbuf, UINT num_bytes )
#ifdef _IAR_CODE
@ "DATA_PER_RAM"
#endif
{
	volatile UINT8 *addr = ( UINT8 * ) paddr ;
	volatile UINT8 *base_addr = ( UINT8 * ) ( ( UINT32 ) paddr & AT49BV162_MASK_BITS ) ;
	UINT8 *buf = ( UINT8 * ) pbuf ;
	UINT8 result ;
	UINT nbytes = 0 ;

	for( nbytes = 0 ; nbytes < num_bytes ; nbytes++ )
	{
		// setup the Program command for the device.
		*( base_addr + 0xAAA ) = FLASH_CODE_AA ;
		*( base_addr + 0x554 ) = FLASH_CODE_55 ;
		*( base_addr + 0xAAA ) = CMD_PROGRAM ;

		*addr = *buf ;

		while(1)
		{
			// loop till when the same data read back that means the byte is written
			// onto the device.


			result = *addr ;
			if( result == *buf )
				break ;
		}
		
		buf ++ ;
		addr ++ ;

	}
	return num_bytes;
}

INT AT49BV162_Erase( void *paddr, UINT32 num_bytes )
#ifdef _IAR_CODE
@ "DATA_PER_RAM"
#endif
{
	volatile UINT8 *addr = ( UINT8 * )( ( UINT32 ) paddr & AT49BV162_MASK_BITS ) ;
	UINT8 result ;
	// setup the Sector Erase command
	*( addr + 0xAAA ) = FLASH_CODE_AA ;
	*( addr + 0x554 ) = FLASH_CODE_55 ;
	*( addr + 0xAAA ) = CMD_ERASE_SETUP ;

	*( addr + 0xAAA ) = FLASH_CODE_AA ;
	*( addr + 0x554 ) = FLASH_CODE_55 ;
	*( addr ) = CMD_ERASE_CONFIRM ;	// Erasing the sector


	while(1)
	{
		result = *addr ;
		if ( (result) & BIT_ERASE_DONE)
		{
			// the erase is completed.
			break ;
		}
	}

	return SUCCESS;
}

INT AT49BV162_Close( void )
#ifdef _IAR_CODE
@ "DATA_PER_RAM"
#endif
{
	return SUCCESS ;
}


/*
void MyAppEntry( void )
{
	void *paddr = ( void * ) 0x31FF20 ;
	INT8 *buf = "Hello" ;
	INT8 recvbuf[5] ;
//	printf("\nAT49BV162_Entry" ) ;
	AT49BV162_Init( paddr, 0x2000 ) ;
	AT49BV162_Erase( paddr, 0x2000 ) ;
	AT49BV162_Write( paddr, buf, 5 ) ;
	AT49BV162_Read( paddr, &recvbuf[0], 5 ) ;

	if( memcmp( &recvbuf[0], buf, 5 ) == 0 )
    	printf("\nStrings Equal" ) ;
	else
		printf("\nStrings Not Equal" ) ;

	return ;
}
*/