?? at25f512_drv.i
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/*C**************************************************************
/ Function: at25f512_drv
/----------------------------------------------------------------
/ Description: ATMEL FLASH (AT25F512A) Driver
/----------------------------------------------------------------
/ Note:
/----------------------------------------------------------------
/ Author: Sam Lu
/ Version: V1.00
/ Date: 2006/02/05
*****************************************************************/
/*_____________I N C L U D E____________________________________*/
// CodeVisionAVR C Compiler
// (C) 1998-2004 Pavel Haiduc, HP InfoTech S.R.L.
// I/O registers definitions for the ATmega168(V)
#pragma used+
sfrb PINB=3;
sfrb DDRB=4;
sfrb PORTB=5;
sfrb PINC=6;
sfrb DDRC=7;
sfrb PORTC=8;
sfrb PIND=9;
sfrb DDRD=0xa;
sfrb PORTD=0xb;
sfrb TIFR0=0x15;
sfrb TIFR1=0x16;
sfrb TIFR2=0x17;
sfrb PCIFR=0x1b;
sfrb EIFR=0x1c;
sfrb EIMSK=0x1d;
sfrb GPIOR0=0x1e;
sfrb EECR=0x1f;
sfrb EEDR=0x20;
sfrb EEARL=0x21;
sfrb EEARH=0x22;
sfrw EEAR=0x21; // 16 bit access
sfrb GTCCR=0x23;
sfrb TCCR0A=0x24;
sfrb TCCR0B=0x25;
sfrb TCNT0=0x26;
sfrb OCR0A=0x27;
sfrb OCR0B=0x28;
sfrb GPIOR1=0x2a;
sfrb GPIOR2=0x2b;
sfrb SPCR=0x2c;
sfrb SPSR=0x2d;
sfrb SPDR=0x2e;
sfrb ACSR=0x30;
sfrb MONDR=0x31;
sfrb SMCR=0x33;
sfrb MCUSR=0x34;
sfrb MCUCR=0x35;
sfrb SPMCSR=0x37;
sfrb SPL=0x3d;
sfrb SPH=0x3e;
sfrb SREG=0x3f;
#pragma used-
// Interrupt vectors definitions
/*H**************************************************************
/ Function: spi_drv.h
/----------------------------------------------------------------
/ Description: spi driver header
/----------------------------------------------------------------
/ Note:
/----------------------------------------------------------------
/ Author:
/ Version:
/ Date:
*****************************************************************/
/*_____________M A R C O________________________________________*/
/*_____________D E F I N A T I O N______________________________*/
/* SPCR - SPI Control Register */
/* SPSR - SPI Status Register */
/*_____________D E F - F U N C T I O N__________________________*/
void spi_initial(void);
unsigned char spi_transfer(volatile unsigned char data);
/*_____________E N D____________________________________________*/
/*H**************************************************************
/ Function: at25f512_drv.h
/----------------------------------------------------------------
/ Description: ATMEL AT25F512A Flash driver header
/----------------------------------------------------------------
/ Note:
/----------------------------------------------------------------
/ Author:
/ Version:
/ Date:
*****************************************************************/
/*_____________M A R C O________________________________________*/
/*_____________D E F I N A T I O N______________________________*/
/* Block write Protect bit */
/* Instruction Codes */
/* Address Space */
/* Address 3-byte mode */
/* Status Register Bit */
/* Interrupt Service Status */
/*Access Status */
/* Error code */
/*_____________D E F - F U N C T I O N__________________________*/
void at25f512_initial(void);
unsigned char write_command(unsigned char op_code);
unsigned char read_status_register(unsigned char *status);
unsigned char write_status_register(unsigned char status_register);
unsigned char get_char_array(unsigned long address, unsigned long nb_of_byte, unsigned char* destination);
unsigned char put_char_array(unsigned long start_add, unsigned char nb_of_byte, unsigned char* source);
unsigned char erase_sector(unsigned long long_add);
unsigned char erase_chip(void);
unsigned char get_mem_id(unsigned char *id);
unsigned char test_write_protect(unsigned long address, unsigned int status_register);
unsigned char set_write_protected_area(unsigned char area);
/*_____________E N D____________________________________________*/
/*_____________V A R I A B L E__________________________________*/
/*_____________E N D____________________________________________*/
/*F**************************************************************
/ Function: at25f512_initial
/----------------------------------------------------------------
/ Description: atmel at25f512a initial
/----------------------------------------------------------------
/ Parameter:
/ Return:
/----------------------------------------------------------------
/ Note:
*****************************************************************/
void at25f512_initial(void)
{
spi_state = 0x00 ;
}
/*F**************************************************************
/ Function: spi_stc
/----------------------------------------------------------------
/ Description: spi stc (interrupt service routine)
/----------------------------------------------------------------
/ Parameter:
/ Return:
/----------------------------------------------------------------
/ Note:
*****************************************************************/
interrupt [18] void spi_stc(void)
{
switch (spi_state)
{
case 0x01 : /* INSTRUCTION STATE */
spi_state = 0x02 ;
byte_cnt = 1;
SPDR = (unsigned char)(address>>16); /* Address phase is 3 byte long for SPI flashes */
break;
case 0x02 : /* ADDRESS STATE */
if (byte_cnt == 3) /* is the last address byte reached? */
{
spi_state = 0x04 ; /* go to the DATA state */
byte_cnt = 0;
SPDR = *data_ptr; /* send the first byte */
}
else if (byte_cnt == 1) /* must the middle address byte be sent? */
{
byte_cnt ++;
SPDR = (unsigned char)(address>>8);
}
else
{
byte_cnt ++;
SPDR = (unsigned char)(address);
}
break;
case 0x04 : /* DATA STATE */
data_ptr++; /* point to the next byte (even if it was the last) */
if (byte_cnt == nb_byte - 1 ) /* is the last byte sent? */
{
PORTB.2 = 1; /* Disable AT25F512 Chip Select (H) */
7;
//SPCR &= ~(1<<SPIE);
SPCR &= ~((1<<6)|(1<<7));
spi_state = 0x00 ; /* return to the idle state */
}
else
{
byte_cnt ++;
SPDR = *data_ptr;
}
break;
default :
{
spi_state = 0x00 ;
}
}
}
/*F**************************************************************
/ Function: write_command
/----------------------------------------------------------------
/ Description: write command for at25f512 (WREN / WRDI)
/----------------------------------------------------------------
/ Parameter: op_code : WREN/WRDI instruction code
/ Return: TRANSFER_COMPLETED : the write access was completed without error
BUSY : the SPI peripheral or the serial memory is busy
/----------------------------------------------------------------
/ Note:
*****************************************************************/
unsigned char write_command(unsigned char op_code)
{
unsigned char sr; /* status register byte */
if (read_status_register(&sr) == 0x01 ) /* Is the SPI interface not currently busy */
{
if (!(sr & (1<<0 ))) /* is the serial memory ready ? */
{
SPCR |= (1<<6); /* Enable SPI Interface */
PORTB.2 = 0; /* Enable AT25F512A Chip Select (L) */
spi_transfer(op_code); /* transmitt the op_code */
PORTB.2 = 1; /* Enable AT25F512A Chip Select (H) */
SPCR &= ~(1<<6); /* Disable SPI Interface */
return 0x01 ;
}
else
{
return 0xFF ;
}
}
else
{
return 0xFF ;
}
}
/*F**************************************************************
/ Function: read_status_register
/----------------------------------------------------------------
/ Description: Read Status Register (RDSR)
/----------------------------------------------------------------
/ Parameter: op_code : status variable address
/ Return: TRANSFER_COMPLETED : the read access is completed without error
BUSY : the SPI peripheral is busy
/----------------------------------------------------------------
/ Note:
*****************************************************************/
unsigned char read_status_register(unsigned char *status)
{
if (spi_state == 0x00 )
{
SPCR |= (1<<6); /* Enable SPI Interface */
PORTB.2 = 0; /* Enable AT25F512A Chip Select (L) */
spi_transfer(0x05); /* transmitt the op_code RDSR */
*status = spi_transfer(0xFF); /* get the status register value, send the value 0xFF to avoid toggle on the MOSI line */
PORTB.2 = 1; /* Disable AT25F512A Chip Select (H) */
SPCR &= ~(1<<6); /* Disable SPI Interface */
return 0x01 ;
}
else
{
*status = 1;
return 0xFF ;
}
}
/*F**************************************************************
/ Function: write_status_register
/----------------------------------------------------------------
/ Description: Write Status Register (WRSR)
/----------------------------------------------------------------
/ Parameter: op_code : status variable address
/ Return: TRANSFER_COMPLETED : the read access is completed without error
BUSY : the SPI peripheral is busy
/----------------------------------------------------------------
/ Note:
*****************************************************************/
unsigned char write_status_register(unsigned char status_register)
{
unsigned char sr; /* read status register */
if (read_status_register(&sr) == 0x01 ) /* Is the SPI interface currently not busy */
{
if (!(sr & (1<<0 ))) /* is the serial memory ready ? */
{
while(write_command(0x06) != 0x01 ); /* write commande - write enable */
SPCR |= (1<<6);
PORTB.2 = 0;
spi_transfer(0x01); /* transmit the WRSR op_code */
spi_transfer(status_register); /* transmit the status register value */
PORTB.2 = 1; /* Disable AT25F512A Chip Select (H) */
SPCR &= ~(1<<6); /* Disable SPI Interface */
return 0x01 ;
}
else
{
return 0xFF ;
}
}
else
{
return 0xFF ;
}
}
/*F**************************************************************
/ Function: get_char_array
/----------------------------------------------------------------
/ Description: get data by block mode and put on buffer
/----------------------------------------------------------------
/ Parameter: address : get data address
nb_of_byte : get number of byte
destination : the result area
/ Return: TRANSFER_COMPLETED : the read access is completed without error
BUSY : the SPI peripheral is busy
OUT_OF_RANGE : address out of range (0x00FFFF)
/----------------------------------------------------------------
/ Note:
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