tr220flash.c

串行 flash 存储器 SST25VFxxx 芯片接口控制程序

/* It is up to the user to give the last byte ID_addr to determine      */
/* whether the device outputs manufacturer's ID first, or device ID 	*/
/* first.  Please see the product datasheet for details.  Returns ID in */
/* variable byte.							*/
/*									*/
/* Input:								*/
/*		ID_addr							*/
/*									*/
/* Returns:								*/
/*		byte:	ID1						*/
/*									*/
/************************************************************************/

/************************************************************************/
/* PROCEDURE:	Read							*/
/*									*/		
/* This procedure reads one address of the device.  It will return the 	*/
/* byte read in variable byte.						*/
/*									*/
/*									*/
/*									*/
/* Input:								*/
/*		Dst:	Destination Address 000000H - 07FFFFH		*/
/*      								*/
/*									*/
/* Returns:								*/
/*		byte							*/
/*									*/
/************************************************************************/
unsigned char Read(unsigned long Dst) 
{
	unsigned char byte = 0;	

	vSST25_CE_Low();			/* enable device */
	vSST25_Send_Byte(0x03); 		/* read command */
	vSST25_Send_Byte(((Dst & 0xFFFFFF) >> 16));	/* send 3 address bytes */
	vSST25_Send_Byte(((Dst & 0xFFFF) >> 8));
	vSST25_Send_Byte(Dst & 0xFF);
	byte = ucSST25_Get_Byte();
	vSST25_CE_High();			/* disable device */
	return byte;			/* return one byte read */
}

/************************************************************************/
/* PROCEDURE:	Read_Cont						*/
/*									*/		
/* This procedure reads multiple addresses of the device and stores	*/
/* data into 128 byte buffer. Maximum byte that can be read is 128 bytes*/
/*									*/
/* Input:								*/
/*		Dst:		Destination Address 000000H - 07FFFFH	*/
/*      	no_bytes	Number of bytes to read	(max = 128)	*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/*									*/
/************************************************************************/

/************************************************************************/
/* PROCEDURE:	Byte_Program						*/
/*									*/
/* This procedure programs one address of the device.			*/
/* Assumption:  Address being programmed is already erased and is NOT	*/
/*		block protected.					*/
/*									*/
/*									*/
/*									*/
/* Input:								*/
/*		Dst:		Destination Address 000000H - 07FFFFH	*/
/*		byte:		byte to be programmed			*/
/*      								*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/*									*/
/************************************************************************/
void Byte_Program(unsigned long Dst, unsigned char byte)
{
	
	Wait_Busy();
	
	vSST25_CE_Low();				/* enable device */
	vSST25_Send_Byte(0x02); 			/* send Byte Program command */
		
	vSST25_Send_Byte(((Dst & 0xFFFFFF) >> 16));	/* send 3 address bytes */
		
	vSST25_Send_Byte(((Dst & 0xFFFF) >> 8));
		
	vSST25_Send_Byte((Dst & 0xFF));
	
	vSST25_Send_Byte(byte);			/* send byte to be programmed */
	
	vSST25_CE_High();				/* disable device */	
	
	Wait_Busy();
}

/************************************************************************/
/* PROCEDURE:	Auto_Add_IncA						*/
/*									*/
/* This procedure programs consecutive addresses of the device.  This  	*/
/* is used to to start the AAI process.  It should be followed by 	*/
/* Auto_Add_IncB.							*/
/* Assumption:  Address being programmed is already erased and is NOT	*/
/*		block protected.					*/
/*									*/
/*									*/
/* Note: Only RDSR command can be executed once in AAI mode.	 	*/
/* 	 Use WRDI to exit AAI mode unless AAI is programming the last	*/
/*	 address or last address of unprotected block, which 		*/
/*	 automatically exits AAI mode.					*/
/*									*/
/* Input:								*/
/*		Dst:		Destination Address 000000H - 07FFFFH	*/
/*		byte:		byte to be programmed			*/
/*      								*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/*									*/
/************************************************************************/

/************************************************************************/
/* PROCEDURE:	Auto_Add_IncB						*/
/*									*/
/* This procedure programs consecutive addresses of the device.  This  	*/
/* is used after Auto_Address_IncA.					*/
/* Assumption:  Address being programmed is already erased and is NOT	*/
/*		block protected.					*/
/*									*/
/* Note: Only RDSR command can be executed once in AAI mode.	 	*/
/* 	 Use WRDI to exit AAI mode unless AAI is programming the last	*/
/*	 address or last address of unprotected block, which 		*/
/*	 automatically exits AAI mode.					*/
/*									*/
/* Input:								*/
/*									*/
/*		byte:		byte to be programmed			*/
/*      								*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/*									*/
/************************************************************************/

/************************************************************************/
/* PROCEDURE: Chip_Erase						*/
/*									*/
/* This procedure erases the entire Chip.				*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void Chip_Erase(void)
{
	Wait_Busy();
	
	vSST25_CE_Low();				/* enable device */
	vSST25_Send_Byte(0x60);			/* send Chip Erase command */
	vSST25_CE_High();				/* disable device */
	
	Wait_Busy();
}

/************************************************************************/
/* PROCEDURE: Sector_Erase						*/
/*									*/
/* This procedure Sector Erases the Chip.				*/
/*									*/
/* Input:								*/
/*		Dst:		Destination Address 000000H - 07FFFFH	*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void Sector_Erase(unsigned long Dst)
{
        Wait_Busy();

	vSST25_CE_Low();				/* enable device */
	vSST25_Send_Byte(0x20);			/* send Sector Erase command */
	vSST25_Send_Byte(((Dst & 0xFFFFFF) >> 16)); 	/* send 3 address bytes */
	vSST25_Send_Byte(((Dst & 0xFFFF) >> 8));
	vSST25_Send_Byte(Dst & 0xFF);
	vSST25_CE_High();				/* disable device */
	
	Wait_Busy();
}

/************************************************************************/
/* PROCEDURE: Block_Erase						*/
/*									*/
/* This procedure Block Erases the Chip.				*/
/*									*/
/* Input:								*/
/*		Dst:		Destination Address 000000H - 07FFFFH	*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void Block_Erase(unsigned long Dst)
{
	Wait_Busy();
	
	vSST25_CE_Low();				/* enable device */
	vSST25_Send_Byte(0x52);			/* send Block Erase command */
	vSST25_Send_Byte(((Dst & 0xFFFFFF) >> 16)); 	/* send 3 address bytes */
	vSST25_Send_Byte(((Dst & 0xFFFF) >> 8));
	vSST25_Send_Byte(Dst & 0xFF);
	vSST25_CE_High();				/* disable device */
	
	Wait_Busy();
}

/************************************************************************/
/* PROCEDURE: Wait_Busy							*/
/*									*/
/* This procedure waits until device is no longer busy (can be used by	*/
/* Byte-Program, Sector-Erase, Block-Erase, Chip-Erase).		*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void Wait_Busy(void)
{
	
	do
	{
	  WREN();
	  ucFlash_Status=Read_Status_Register();
	}
	while(((ucFlash_Status &0x01)==0x01)||((ucFlash_Status &0x02)==0x00));	/* waste time until not busy */
		
}

/************************************************************************/
/* PROCEDURE: Wait_Busy_AAI						*/
/*									*/
/* This procedure waits until device is no longer busy for AAI mode.	*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/

/************************************************************************/
/* PROCEDURE: WREN_Check						*/
/*									*/
/* This procedure checks to see if WEL bit set before program/erase.	*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/

/************************************************************************/
/* PROCEDURE: WREN_AAI_Check						*/
/*									*/
/* This procedure checks for AAI and WEL bit once in AAI mode.		*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/