x5045.c

单片机模拟I2C读写看门狗芯片X5045

#include "X5045.h"

//unsigned char rda[8];
//unsigned char cs_rda[8];
 
//看门狗写使能子程序
void wren_dog(void)
{
	// unsigned char com;
	// com=0x06;//WREN;
	SCK=0;
	CS=0;
	in_byte(0x06);
	SCK=0;
	CS=1;
}

//看门狗写禁止子程序
void wrdi_dog(void)
{
	//unsigned char com;
	//com=0x04;//WRDI;
	SCK=0;
	CS=0;
	in_byte(0x04);
	SCK=0;
	CS=1;
}



//写状态寄存器
void wrsr_dog(unsigned char status_reg)
{
	// unsigned char com=0x01;//WRSR;
	SCK=0;
	CS=0;
	in_byte(0x01);
	in_byte(status_reg);
	SCK=0;
	CS=1;
	wip_poll();
}


//读状态寄存器
unsigned char rdsr_dog(void)
{
	// unsigned char com=0x05;//RDSR;
	SCK=0;
	CS=0;
	in_byte(0x05);
	return(out_byte());
	SCK=0;
	CS=1;
}

//字节读
/*unsigned char byte_read(unsigned char H,unsigned char L)
{
	unsigned char data_dog,add;
	SCK=0;
	CS=0;
	SO=1;
	SI=1;
	add=H<<3;
	add|=0x03;//READ;
	in_byte(add);
	add=L;
	in_byte(add);
	data_dog=out_byte();
	SCK=0;
	CS=1;
	return(data_dog);
}
//字节写
//H,地址高字节；L地址低字节；D写入的数据
void byte_write(unsigned char H,unsigned char L,unsigned char D)
{	
	unsigned char data_dog,add;
	SCK=0;
	CS=0;
	SO=1;
	SI=1;
	add=H<<3;
	add|=0x02;//WRTE;
	in_byte(add);
	add=L;
	in_byte(add);
	data_dog=D;
	in_byte(data_dog);
	CS=1;
	wip_poll();
}*/
//复位看门狗子程序
void rest_dog(void)
{
	CS=0;
	CS=1;
}


//检验写操作是否结束。
unsigned char wip_poll(void)
{
	unsigned char i;
	unsigned char wip;
	for(i=0xff;i>=1;i--) 
	{
		wip=rdsr_dog();
		wip&=0x01;
		if(wip==0) break;
	}
	return(wip);

}

//单字节指令或数据写入X25045
//在SI线上输入的数据在SCK的上升沿被锁存。
void in_byte(unsigned char byt)
{
	unsigned char i;
	//SCK=0;
	//CS=0;
	for(i=8;i>=1;i--)
	{
		SCK=0; 
		SI=byt&0x80; 
		SCK=1; 
		byt=byt<<1; 
	}
	// SI=0;
	// SCK=0;
	// CS=1;
}

//单字节数据从X25045读到单片机
//数据由SCK的下降沿输出到SO线上。
unsigned char out_byte(void)
{
	unsigned char i;
	unsigned char byt;
	//SO=1;
	//SCK=0;
	//CS=0;
	for(i=8;i>=1;i--)
	{
		byt=byt<<1;
		SCK=1;
		SCK=0; 
		byt|=SO; 
	}
	//SCK=0;
	//CS=1;
	return (byt);
}