sst25vf016b.c

SST 的SPI FLASH 驱动程序,给大家在做SPI是做参考用,

	CE_High();			/* disable device */
	return byte;
}

/************************************************************************/
/* PROCEDURE: EWSR							*/
/*									*/
/* This procedure Enables Write Status Register.  			*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void EWSR()
{
	CE_Low();			/* enable device */
	Send_Byte(0x50);		/* enable writing to the status register */
	CE_High();			/* disable device */
}

/************************************************************************/
/* PROCEDURE: WRSR							*/
/*									*/
/* This procedure writes a byte to the Status Register.			*/
/*									*/
/* Input:								*/
/*		byte							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void WRSR(byte)
{
	CE_Low();			/* enable device */
	Send_Byte(0x01);		/* select write to status register */
	Send_Byte(byte);		/* data that will change the status of BPx 
					   or BPL (only bits 2,3,4,5,7 can be written) */
	CE_High();			/* disable the device */
}

/************************************************************************/
/* PROCEDURE: WREN							*/
/*									*/
/* This procedure enables the Write Enable Latch.  It can also be used 	*/
/* to Enables Write Status Register.					*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void WREN()
{
	CE_Low();			/* enable device */
	Send_Byte(0x06);		/* send WREN command */
	CE_High();			/* disable device */
}

/************************************************************************/
/* PROCEDURE: WRDI							*/
/*									*/
/* This procedure disables the Write Enable Latch.			*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void WRDI()
{
	CE_Low();			/* enable device */
	Send_Byte(0x04);		/* send WRDI command */
	CE_High();			/* disable device */
}

/************************************************************************/
/* PROCEDURE: EBSY							*/
/*									*/
/* This procedure enable SO to output RY/BY# status during AAI 		*/
/* programming.								*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void EBSY()
{
	CE_Low();			/* enable device */
	Send_Byte(0x70);		/* send EBSY command */
	CE_High();			/* disable device */
}

/************************************************************************/
/* PROCEDURE: DBSY							*/
/*									*/
/* This procedure disable SO as output RY/BY# status signal during AAI	*/
/* programming.								*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/************************************************************************/
void DBSY()
{
	CE_Low();			/* enable device */
	Send_Byte(0x80);		/* send DBSY command */
	CE_High();			/* disable device */
}

/************************************************************************/
/* PROCEDURE: Read_ID							*/
/*									*/
/* This procedure Reads the manufacturer's ID and device ID.  It will 	*/
/* use 90h or ABh as the command to read the ID (90h in this sample).   */
/* 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(Manufacture's ID = BFh or Device ID = 80h)	*/
/*									*/
/************************************************************************/
unsigned char Read_ID(ID_addr)
{
	unsigned char byte;
	CE_Low();			/* enable device */
	Send_Byte(0x90);		/* send read ID command (90h or ABh) */
    	Send_Byte(0x00);		/* send address */
	Send_Byte(0x00);		/* send address */
	Send_Byte(ID_addr);		/* send address - either 00H or 01H */
	byte = Get_Byte();		/* receive byte */
	CE_High();			/* disable device */
	return byte;
}

/************************************************************************/
/* PROCEDURE: Jedec_ID_Read						*/
/*									*/
/* This procedure Reads the manufacturer's ID (BFh), memory type (25h)  */
/* and device ID (41h).  It will use 9Fh as the JEDEC ID command.    	*/
/* Please see the product datasheet for details.  			*/
/*									*/
/* Input:								*/
/*		None							*/
/*									*/
/* Returns:								*/
/*		IDs_Read:ID1(Manufacture's ID = BFh, Memory Type (25h), */
/*		 and Device ID (80h)					*/
/*									*/
/************************************************************************/
unsigned long Jedec_ID_Read() 
{
	unsigned long temp;
	
	temp = 0;

	CE_Low();			 /* enable device */
	Send_Byte(0x9F);		 /* send JEDEC ID command (9Fh) */
    	temp = (temp | Get_Byte()) << 8; /* receive byte */
	temp = (temp | Get_Byte()) << 8;	
	temp = (temp | Get_Byte()); 	 /* temp value = 0xBF2541 */
	CE_High();			 /* disable device */

	return temp;
}

/************************************************************************/
/* PROCEDURE:	Read							*/
/*									*/		
/* This procedure reads one address of the device.  It will return the 	*/
/* byte read in variable byte.						*/
/*									*/
/*									*/
/*									*/
/* Input:								*/
/*		Dst:	Destination Address 000000H - 1FFFFFH		*/
/*      								*/
/*									*/
/* Returns:								*/
/*		byte							*/
/*									*/
/************************************************************************/
unsigned char Read(unsigned long Dst) 
{
	unsigned char byte = 0;	

	CE_Low();			/* enable device */
	Send_Byte(0x03); 		/* read command */
	Send_Byte(((Dst & 0xFFFFFF) >> 16));	/* send 3 address bytes */
	Send_Byte(((Dst & 0xFFFF) >> 8));
	Send_Byte(Dst & 0xFF);
	byte = Get_Byte();
	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 - 1FFFFFH	*/
/*      	no_bytes	Number of bytes to read	(max = 128)	*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/*									*/
/************************************************************************/
void Read_Cont(unsigned long Dst, unsigned long no_bytes)
{
	unsigned long i = 0;
	CE_Low();				/* enable device */
	Send_Byte(0x03); 			/* read command */
	Send_Byte(((Dst & 0xFFFFFF) >> 16)); 	/* send 3 address bytes */
	Send_Byte(((Dst & 0xFFFF) >> 8));
	Send_Byte(Dst & 0xFF);
	for (i = 0; i < no_bytes; i++)		/* read until no_bytes is reached */
	{
		upper_128[i] = Get_Byte();	/* receive byte and store at address 80H - FFH */
	}
	CE_High();				/* disable device */

}

/************************************************************************/
/* PROCEDURE:	HighSpeed_Read						*/
/*									*/		
/* This procedure reads one address of the device.  It will return the 	*/
/* byte read in variable byte.						*/
/*									*/
/*									*/
/*									*/
/* Input:								*/
/*		Dst:	Destination Address 000000H - 1FFFFFH		*/
/*      								*/
/*									*/
/* Returns:								*/
/*		byte							*/
/*									*/
/************************************************************************/
unsigned char HighSpeed_Read(unsigned long Dst) 
{
	unsigned char byte = 0;	

	CE_Low();			/* enable device */
	Send_Byte(0x0B); 		/* read command */
	Send_Byte(((Dst & 0xFFFFFF) >> 16));	/* send 3 address bytes */
	Send_Byte(((Dst & 0xFFFF) >> 8));
	Send_Byte(Dst & 0xFF);
	Send_Byte(0xFF);		/*dummy byte*/
	byte = Get_Byte();
	CE_High();			/* disable device */
	return byte;			/* return one byte read */
}

/************************************************************************/
/* PROCEDURE:	HighSpeed_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 - 1FFFFFH	*/
/*      	no_bytes	Number of bytes to read	(max = 128)	*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/*									*/
/************************************************************************/
void HighSpeed_Read_Cont(unsigned long Dst, unsigned long no_bytes)
{
	unsigned long i = 0;
	CE_Low();				/* enable device */
	Send_Byte(0x0B); 			/* read command */
	Send_Byte(((Dst & 0xFFFFFF) >> 16)); 	/* send 3 address bytes */
	Send_Byte(((Dst & 0xFFFF) >> 8));
	Send_Byte(Dst & 0xFF);
	Send_Byte(0xFF);			/*dummy byte*/
	for (i = 0; i < no_bytes; i++)		/* read until no_bytes is reached */
	{
		upper_128[i] = Get_Byte();	/* receive byte and store at address 80H - FFH */
	}
	CE_High();				/* disable device */
}

/************************************************************************/
/* 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 - 1FFFFFH	*/
/*		byte:		byte to be programmed			*/
/*      								*/
/*									*/
/* Returns:								*/
/*		Nothing							*/
/*									*/
/************************************************************************/
void Byte_Program(unsigned long Dst, unsigned char byte)
{
	CE_Low();				/* enable device */
	Send_Byte(0x02); 			/* send Byte Program command */
	Send_Byte(((Dst & 0xFFFFFF) >> 16));	/* send 3 address bytes */
	Send_Byte(((Dst & 0xFFFF) >> 8));
	Send_Byte(Dst & 0xFF);
	Send_Byte(byte);			/* send byte to be programmed */
	CE_High();				/* disable device */
}

/************************************************************************/
/* PROCEDURE:	Auto_Add_IncA						*/
/*									*/
/* This procedure programs consecutive addresses of 2 bytes of data into*/
/* the device:  1st data byte will be programmed into the initial 	*/
/* address [A23-A1] and with A0 = 0.  The 2nd data byte will be be 	*/
/* programmed into initial address [A23-A1] and with A0  = 1.  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 with SO  	*/
/* 	 disable to output RY/BY# status.  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 - 1FFFFFH	*/
/*		byte1:		1st byte to be programmed		*/
/*      	byte1:		2nd byte to be programmed		*/