📄 iic_host_sim.c

📁 gpio 采用C51方式读写EEprom的程序,已经调试通过
💻 C
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#include "ATT7025.h"
#include <intrins.h>

sbit  SCL=P3^0;
sbit  SDA=P3^1;
bit   bdata  SystemError;
unsigned  char idata addbuf[4]; 
unsigned  char xdata sendbuf[10];      // 数据发送缓冲区;
unsigned  char xdata receivebuf[10];    // 数据接收缓冲区;
void		System_Initialize(void);		//The system run in high frequency mode
void		Variable_Initialize(void);		//Initialize user's variables
void		E2PROM_Written_Enable(void);	//Open E2PROM written-protection 

void writeNbyte(unsigned char slave_add, unsigned int word_address, unsigned char n);
void receiveNbyte(unsigned char idata slave_add, unsigned int word_address, unsigned char n);
void iic_start(void);
void iic_stop(void);
void			Delay(void);  //Waiting for writting E2PROM
void            delayNOP(void);// ajust  I2C  bus 
void delay(unsigned  int N); 
unsigned  char  count;
main()
{
	System_Initialize();
	Variable_Initialize();

	E2PROM_Written_Enable();
    writeNbyte(0xA0,0x0010,4);
	delay(500);
	receiveNbyte(0xA0,0x0010,4);
	_nop_();
	_nop_();
	_nop_();
	for(count=1; count<5; count++)
	{

	}
	_nop_();
	_nop_();
	_nop_();
	Delay();
	_nop_();
	_nop_();
	_nop_();
	Delay();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
}


/*
Discription:	The system run in high frequency mode
*/
void	System_Initialize(void)
{
	BWPR = 0xC3;
	BWPR = 0x9B;         			 //enable the register-written 
	BORCFG |= 0x80;					 //high frequency mode
	BWPR = 0xA8;         			 //disable the register-written  
	while((SYSSCR&0x80) != 0x80);	 //Waiting for high frequency stabilizing
	BWPR = 0xC3;
	BWPR = 0x9B;				     //enable the register-written  
	CLKCFG |= 0x02;     		 	 //SYSCK1=1,fsys=fpri 			
	BWPR = 0xA8;	        		 //disable the register-written 

}

void	Variable_Initialize(void)
{
	unsigned char i;
	for(i=0; i<10; i++)
	{
    sendbuf[i]=i+0x50 ;   // 数据发送缓冲区;
	receivebuf[i]=0 ;   //clear  data  receive buffer
	}

}
/*
Discription:	Setup I2C registers
//时钟保持高，数据线从高到低一次跳变，I2C通信开始
*/
void	iic_start(void)
{
	EA = 1;                          //disable global  interrupt
	BWPR = 0xC3;                     
	BWPR = 0x9B;         			 //enable the registers written 
	SUPDC = SUPDC |0x02;			 //PDI2C = 1	Close I2C sector. Open GPIO function
	BWPR = 0xA8;         			 //disable the register written  	
    DDRP3=DDRP3|(0X03);              // 将p3.0\p3.1设置成输出 
	SDA = 1;         
	SCL = 1;
	delay(5);      // 延时50us 
	SDA = 0;
	delay(5);      // 延时50us 
	SCL = 0;
    delay(5);
}

/*
Discription:	Stop I2C transmission   with GPIO function
//时钟保持高，数据线从低到高一次跳变，I2C通信停止
*/
void    iic_stop(void)
{

	SDA = 0; 
	delay(1);
	SCL = 1;
	delay(2);
	SDA = 1;
	delay(1);
	//SCL = 0;	

}
//--------------------------------------------------------------------------------------------------
// 函数名称： slave_ACK
// 函数功能： 从机发送应答位子程序
//--------------------------------------------------------------------------------------------------
void  slave_ACK(void)
{
	SDA = 0;
	delay(1);
	SCL = 1;
    delay(1);		
	SCL = 0;
    delay(1);
	SDA = 1;
}
//--------------------------------------------------------------------------------------------------
// 函数名称： slave_NOACK
// 函数功能： 从机发送非应答位子程序，迫使数据传输过程结束
//--------------------------------------------------------------------------------------------------
void slave_NOACK(void)
{ 
	SDA = 1;   
	SCL = 1;
	delayNOP();
	SDA = 0;
	SCL = 0;
}

//--------------------------------------------------------------------------------------------------
// 函数名称： check_ACK
// 函数功能： 主机应答位检查子程序，迫使数据传输过程结束
//--------------------------------------------------------------------------------------------------
void check_ACK(void)
{ 
    DDRP3=DDRP3&(0XFD);  // 将p3.1设置成输入
//	SDA = 1; 
    SCL = 1;
    delay(1);
	SCL = 1;
	F0 = 0;
	delay(1);
	if(SDA == 1)    // 若SDA=1表明非应答，置位非应答标志F0
		F0 = 1;
    delay(1);
	SCL = 0;


    DDRP3=DDRP3|(0X02);  // 将p3.1设置成输出
    SDA = 1;
  	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
}

//--------------------------------------------------------------------------------------------------
// 函数名称： IICSendByte
// 入口参数： ch
// 函数功能： 发送一个字节
//--------------------------------------------------------------------------------------------------
void IICSendByte(unsigned char ch)
{ 
	unsigned char idata n=8;     // 向SDA上发送一位数据字节，共八位
	while(n--)
	{ 
		if((ch&0x80) == 0x80)    // 若要发送的数据最高位为1则发送位1
		{
			SDA = 1;    // 传送位1
            delay(1);
			SCL = 1;
			delay(4);
			SCL = 0; 
			delay(1);
			SDA = 0;
		}
		else
		{  
			SDA = 0;    // 否则传送位0
            delay(1);
			SCL = 1;
			delay(4);
			SCL = 0; 
		    delay(1);
		}
		ch = ch<<1;    // 数据左移一位
	}
}
//--------------------------------------------------------------------------------------------------
// 函数名称： IICreceiveByte
// 返回接收的数据
// 函数功能： 接收一字节子程序
//--------------------------------------------------------------------------------------------------
unsigned char IICreceiveByte(void)
{
	unsigned char idata n=8;    // 从SDA线上读取一上数据字节，共八位
	unsigned char tdata;
  
	while(n--)
	{
       DDRP3=DDRP3&(0XFD);  // 将p3.1设置成输入
        delay(1);
		SCL = 1;
        _nop_();
		tdata = tdata<<1;    // 左移一位，或_crol_(temp,1)
		if(SDA == 1)
			tdata = tdata|0x01;    // 若接收到的位为1，则数据的最后一位置1
		else 
			tdata = tdata&0xfe;    // 否则数据的最后一位置0
		delay(1);
		SCL=0;
	}
   DDRP3=DDRP3|(0X02);  // 将p3.1设置成输出
	return(tdata);
}
//--------------------------------------------------------------------------------------------------
// 函数名称： writeNbyte
// 入口参数： slave_add从机地址,n要发送的数据个数
// 函数功能： 发送n位数据子程序
//--------------------------------------------------------------------------------------------------
void writeNbyte(unsigned char slave_add, unsigned int word_address, unsigned char n)
{          
	unsigned char idata send_da,j=0,i=0,h=3;
    unsigned char high_address, low_address;
	high_address = (word_address & 0xFF00) >> 8;
	low_address = word_address & 0x00FF; 
	addbuf[0]=slave_add;
	addbuf[1]=high_address;
    addbuf[2]=low_address;
	iic_start();                // 启动I2C
    while(h--)
	{ 
     IICSendByte(addbuf[i++]);
     check_ACK();
     if (F0 == 1)
		{
			SystemError=1;
			return;    // 若非应答表明器件错误或已坏，置错误标志位SystemError
		}
	}
	i=0;
	while(n--)
	{ 
	send_da = sendbuf[i++];	 
	IICSendByte(send_da);
	check_ACK();    // 检查应答位
		if (F0 == 1)
		{
			SystemError=1;
			return;    // 若非应答表明器件错误或已坏，置错误标志位SystemError
		}
	}
	iic_stop();         // 全部发完则停止
}
//--------------------------------------------------------------------------------------------------
// 函数名称： receiveNbyte
// 入口参数： slave_add从机地址,n要接收的数据个数
// 函数功能： 接收n位数据子程序
//--------------------------------------------------------------------------------------------------
void receiveNbyte(unsigned char idata slave_add, unsigned int word_address, unsigned char n)
{ 
	unsigned char idata receive_da,j=0,i=0,h=3;
    unsigned char high_address, low_address;
	high_address = (word_address & 0xFF00) >> 8;
	low_address = word_address & 0x00FF; 
	addbuf[0]=slave_add;
	addbuf[1]=high_address;
    addbuf[2]=low_address;
    addbuf[3]=slave_add|(0x01);
	iic_start();                // 启动I2C
    while(h--)
	{ 
     IICSendByte(addbuf[i++]);
     check_ACK();
     if (F0 == 1)
		{
			SystemError=1;
			return;    // 若非应答表明器件错误或已坏，置错误标志位SystemError
		}
	}
   	iic_start();
    IICSendByte(addbuf[3]);
	i=0;  
	check_ACK();
     if (F0 == 1)
		{
			SystemError=1;
			return;    // 若非应答表明器件错误或已坏，置错误标志位SystemError
		}
	while(n--)
	{ 
		receive_da=IICreceiveByte();
		receivebuf[i++]=receive_da;
		slave_ACK();    // 收到一个字节后发送一个应答位
	}
	slave_NOACK();      // 收到最后一个字节后发送一个非应答位
	iic_stop();
}

/*
Discription:	Open E2PROM written-protection 
*/
void	E2PROM_Written_Enable(void)
{
	BWPR = 0xC3;
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