18.c

这是我大学4年来做过的竞赛以及老师的科研项目所积累下来的c51源代码

#include 
sbit CS=P2^7;
sbit SK=P2^6;
sbit DI=P2^5;
sbit DO=P2^4;

extern unsigned char ReadChar(unsigned char address);
extern void WriteChar(unsigned char address,unsigned char InData);
extern void ReadString(unsigned char data *RamAddress,unsigned char RomAddress,unsigned char Number);
extern void WriteString(unsigned char data *RamAddress,unsigned char RomAddress,unsigned char Number);

void Ewen(void) 
{
	unsigned char temp,InData;
	CS=0;	
	SK=0;
	CS=1;
	InData=0x98;	                            // 10011XXXX
	for(temp=9;temp!=0;temp--) 
{	                                            // 9
		DI=InData&0x80;
		SK=1;	SK=0;
		InData<<=1;
	}
	CS=0;
}

//关闭结构
void Ewds(void) 
{
	unsigned char temp,InData;
	CS=0;
	SK=0;
	CS=1;
	InData=0x80;	                 // 10000XXXX
	for(temp=9;temp!=0;temp--) 
{	                                 // 9
		DI=InData&0x80;
		SK=1;	SK=0;
		InData<<=1;
	}
	CS=0;
}
//读数据
unsigned int Read(unsigned char address) 
{
	unsigned char temp;
	unsigned int result;
	Ewen();
	SK=0;	DI=1;	                                  // 110 A5-A0
	CS=0;	CS=1;
	SK=1;	SK=0;			                          // 1
	address=address&0x3f|0x80;
	for(temp=8;temp!=0;temp--) 
{	                                                  // 8
		DI=address&0x80;
		SK=1;	SK=0;
		address<<=1;
	}
	DO=1;
	for(temp=16;temp!=0;temp--) 
{	                                                 // 16
		SK=1;
		result=(result<<<=1;
	}
	for(temp=16;temp!=0;temp--) 
{	                                                 // 16
		DI=InData&0x8000;
		SK=1;	SK=0;
		InData<<=1;
	}
	CS=0;	DO=1;
	CS=1;	SK=1;
	while(DO==0) 
{			                                        // 测忙
		SK=0;	SK=1;
	}
	SK=0;	CS=0;
	Ewds();
}

// 擦除记忆区 An - A0.
void Erase(unsigned char address) 
{
	unsigned char temp;
	Ewen();
	SK=0;	DI=1;	                                // 111 A5-A0
	CS=0;	CS=1;
	SK=1;	SK=0;			                       // 1
	address|=0xc0;
	for(temp=8;temp!=0;temp--) 
{	                                                // 8
		DI=address&0x80;
		SK=1;	SK=0;
		address<<=1;
	}
	CS=0;	DO=1;
	CS=1;	SK=1;
	while(DO==0) {
		SK=0;	SK=1;
	}
	SK=0;	CS=0;
	Ewds();
}

// 擦除所有存储区 VCC = 4.5V to 5.5V.
void Eral(void) 
{
	unsigned char temp,InData;
	Ewen();
	CS=0;
	SK=0;
	CS=1;
	InData=0x90;	                     // 10010XXXX
	for(temp=9;temp!=0;temp--) 
{	                                     // 9
		DI=InData&0x80;
		SK=1;	SK=0;
		InData<<=1;
	}
	CS=0;	DO=1;
	CS=1;	SK=1;
	while(DO==0) 
{
		SK=0;	SK=1;
	}
	SK=0;	CS=0;
	Ewds();
}

//写存储区 VCC = 4.5V to 5.5V.
void Wral(unsigned int InData) 
{
	unsigned char temp,address;
	Ewen();
	CS=0;
	SK=0;
	CS=1;
	address=0x88;	                                // 10001XXXX
	for(temp=9;temp!=0;temp--) 
{	                                                // 9
		DI=address&0x80;
		SK=1;	SK=0;
		address<<=1;
	}
	for(temp=16;temp!=0;temp--) 
{	                                                // 16
		DI=InData&0x8000;
		SK=1;	SK=0;
		InData<<=1;
	}
	CS=0;	DO=1;
	CS=1;	SK=1;
	while(DO==0) 
{
		SK=0;	SK=1;
	}
	SK=0;	CS=0;
	Ewds();
}


unsigned char ReadChar(unsigned char address) 
{
	unsigned char temp=address>>1;
	if(address&0x01) return((unsigned char)(Read(temp)>>8));
	else return((unsigned char)(Read(temp)));
}

void WriteChar(unsigned char address,unsigned char InData) 
{
	unsigned char temp=address>>1;
	if(address&0x01) Write(temp,(unsigned int)(Read(temp)&0x00ff|(InData<>1) 
{
		temp=*RamAddress;
		RamAddress++;
		temp=temp|(*RamAddress)<>1,temp);
		RomAddress++;
		RomAddress++;
		Number--;
		Number--;
	}
	if(Number) WriteChar(RomAddress,*RamAddress);
}