spi.h

x5045三线制总线读写程序,通过keil C验证OK!

#include <reg51.h>

sbit  SPI_SO=	P1^3;
sbit  SPI_SI=	P1^2;
sbit SPI_SCK=	P1^1;
sbit  SPI_CS=	P1^0;

//25045可编程看门狗监控EEPROM指令集
#define WREN 0x06 	// 00000110 //设置写使能锁存器（允许写操作)
#define WRDI 0x04 	// 00000100 //复位写使能锁存器（禁止写操作）
#define RDSR 0x05 	// 00000101 //读状态寄存器
#define WRSR 0x01	// 00000001 //写状态寄存器（块锁定）
#define READ 0x03	// 00000011 //从开始于所选地址的存储器列阵中读出数据
#define WRTE 0x02	// 00000010 //把数据写入开始于所选地址的存储器阵列中（1至4字节）

/*void RESWDI(void);
void WREN(void);
void WRDI(void);
void WRSR(void);
unsigned char RSDR(void);
void WIPCHK(void);
unsigned char INPUTByte(void);
void OUTByte(unsigned char Byte);
unsigned char ReadByte(unsigned char ADD);
void WriteByte(unsigned char Byte,ADD);*/

void wren_dog(void);
void wrdi_dog(void);
void wrsr_dog(unsigned char status_reg);
unsigned char rdsr_dog(void);
unsigned char byte_read(unsigned char H,unsigned char L);
void byte_write(unsigned char H,unsigned char L,unsigned char D);
void rest_dog(void);
unsigned char wip_poll(void);
void in_byte(unsigned char byt);
unsigned char out_byte(void);