www.pudn.com > iccavr_lib.rar > at25.h, change:1999-08-25,size:891b

/* 
**  Header file : at25.h 
*/ 
 
#ifndef		__AT25__H 
#define		__AT25__H 
 
/* 
**  Constants for the /CS signal on the SPI EEPROM 
**  In this case the PB4 (/SS) pin is used. 
*/ 
#define AT25Enable              PORTB &= 0xE0 
#define AT25Disable             PORTB |= 0x10 
 
 
/* 
**  Constants for the status register. 
*/ 
#define BLOCK_PROTECT_NONE      0x00 
#define BLOCK_PROTECT_QUARTER   0x04 
#define BLOCK_PROTECT_HALF      0x08 
#define BLOCK_PROTECT_ALL       0x0C 
#define WRITE_PROTECT_ENABLE    0x80 
#define WRITE_ENABLE            0x02 
#define WRITE_CYCLE_IN_PROGRESS 0x01 
 
 
void AT25Init(void); 
void AT25WriteEnable( void); 
void AT25WriteDisable(void); 
unsigned char AT25ReadStatusReg(void); 
void AT25WriteStatusReg(unsigned char); 
unsigned char AT25Read(unsigned int); 
void AT25Write(unsigned int, unsigned char); 
 
#endif 
 
/* 
**  End of Header file 
*/