i2c_avr.c

avr读写24cxx程序模块

/*                
#include <io.h>
#include <interrupt.h>		// include for Intrrupt Vector
#include <sig-avr.h>
#include <pgmspace.h>
#include <string.h>
#include "mytypes.h"

#include "uart.h"


*/  //   <<<<--- ////This is  8051  define_...C///////

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#include <avr/pgmspace.h>
#include <compat/deprecated.h>
#include <string.h>
#include "mytypes.h"

///*******************

#define QSFUN_LIB			// note that this define !
#include "QS_Func.h"
#include "QSxxxxH2_EQ.h"
#include "uart.h"
#include "Qs51_Reg.h"

#define FREQUENCYTABLE
#include "SampleRateTbl.h"

///*/

/*********************************************************
*******************  I2c_8051.c  *************************
*********  SDA -> P1_0		SCK -> P1_1  *****************
*********************************************************/

//#include   <macros.h>
//#include   <sfr_defs.h>

//#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit)) 
//#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))

#define sbi(x, y)  (x |= (1 << y))   /*置位寄器x的第y位*/
#define clr(x, y)  (x &= ~(1 <<y ))  /*清零寄器x的第y位*/ 


#define  CLK_PORT_DDR    DDRC
#define  CLK_PORT        PORTC
#define  SDA_PORT_DDR    DDRC
#define  SDA_PORT        PORTC


#define SCK 6
#define SDA 7



//extern void Delay(U16 nDel);

//#ifdef DEBUG_MODE
	extern U08 sDebugBuf[30];
	extern U08 sHex[17];
//#endif

void Start_Con(void)					// Start Condition
{
	sbi(CLK_PORT_DDR,SCK);//SCK :Output Mode
	sbi(SDA_PORT_DDR,SDA);//SDA :Output Mode

	//SCK = 1;    	 					// SCK High
	sbi(CLK_PORT,SCK);//SCK :SCK High
	//SDA = 1;	     					// SDA High
	sbi(SDA_PORT,SDA);//SDA :SDA High

	Delay(50);

	//SDA = 0;						 	// SDA Low
	cbi(SDA_PORT,SDA);//SDA :SDA Low
	Delay(10);
	//SCK = 0;							// SCK Low
	cbi(CLK_PORT,SCK);//SCK :SDA Low
	Delay(10);
}

void Stop_Con(void)						// Stop Condition
{
	sbi(CLK_PORT_DDR,SCK);//SCK :Output Mode
	sbi(SDA_PORT_DDR,SDA);//SDA :Output Mode

	//SDA = 0;							// SDA Low
	cbi(SDA_PORT,SDA);//SDA :SDA Low
	//SCK = 0;							// SCK Low
	cbi(CLK_PORT,SCK);//SCK :SCK Low

//	Delay_Loop(20);	//眠啊
	Delay(2);

	//SCK = 1;    	 					// SCK High
	sbi(CLK_PORT,SCK);//SCK :SCK High
	Delay(10);
	//SDA = 1;	     					// SDA High
	sbi(SDA_PORT,SDA);//SDA :SDA High
	Delay(50);

//	Delay_Loop(20);	//眠啊
}
 
void Restart_Con(void)					// Restart Condition
{
	Stop_Con();
	Delay(250);						// 2ms Delay
}

void I2c_DataOut(U08 wr_data)
{
	U08 cnt, Temp;

	sbi(CLK_PORT_DDR,SCK);//SCK :Output Mode
	sbi(SDA_PORT_DDR,SDA);//SDA :Output Mode

	for(cnt=0;cnt<8;cnt++)
	{
		Temp = wr_data << cnt;

		if(0x80&Temp)
			//SDA = 1;
			sbi(SDA_PORT,SDA);//SDA :SDA High
		else 
			//SDA = 0;
			cbi(SDA_PORT,SDA);//SDA :SDA Low

		Delay(2);
		
		//SCK = 1;
		sbi(CLK_PORT,SCK);//SCK :SCK High

		Delay(10);

		//SCK = 0;
		cbi(CLK_PORT,SCK);//SCK :SCK Low
		Delay(10);
	}
}

U08 I2c_DataIn(void)
{
	U08 cnt, rd_data = 0x00;

	sbi(CLK_PORT_DDR,SCK);//SCK :Output Mode
	cbi(SDA_PORT_DDR,SDA);//SDA :Input Mode

	//SDA = 1;						// Open drain on
	sbi(SDA_PORT,SDA);//SDA :SDA High
	
//	TRISC4 = 1;
	
	for(cnt=0;cnt<8;cnt++)
	{
		rd_data <<= 1;
		//SCK = 1;
		sbi(CLK_PORT,SCK);//SCK :SCK High

//		Delay_Loop(20);	//眠啊

		if(PINC&(1<<SDA)) rd_data |= 0x01;
		else rd_data &= 0xFE;

		//SCK = 0;
		cbi(CLK_PORT,SCK);//SCK :SCK Low

//		Delay_Loop(20);	//眠啊
	}
//	TRISC4 = 0;						// RC4 output
	return(rd_data);
}

U08 AckFlag(void)
{             
	U16 time_out;
	U08 Ack = 1;

	sbi(CLK_PORT_DDR,SCK);//SCK :Output Mode
	cbi(SDA_PORT_DDR,SDA);//SDA :Input Mode

	//SCK = 1;
	sbi(CLK_PORT,SCK);//SCK :SCK High

	Delay(5);

	//Ack = SDA;			// ACK
	Ack = PINC&(1<<SDA);
	Delay(5);
	//SCK = 0;                 	// SCK Low
	cbi(CLK_PORT,SCK);//SCK :SCK Low
	Delay(10);
	//sbi(SDA_PORT,SDA);//SDA :SDA High

	return Ack;
}	

void I2c_Write(U08 control, U08 addr, U08 wr_data)
{            
//Re_Write:
    Start_Con();
    I2c_DataOut(control);				// device address and R/W

    if(AckFlag()==0)
    {
#ifdef DEBUG_MODE_OFF
			strcpy(sDebugBuf, "MSG ACK Error\r\n");
			PRINT(sDebugBuf);
#endif
    	//Restart_Con();
    	//goto Re_Write;
    }
	Delay(50);

    I2c_DataOut(addr);              	// address
   	if(AckFlag()==0)
   	{
#ifdef DEBUG_MODE_OFF
			strcpy(sDebugBuf, "MSG ACK Error\r\n");
			PRINT(sDebugBuf);
#endif
  		//Restart_Con();
   		//goto Re_Write;
   	}
	Delay(50);

   	I2c_DataOut(wr_data);              	// data
    if(AckFlag()==0)
    {
#ifdef DEBUG_MODE_OFF
			strcpy(sDebugBuf, "MSG ACK Error\r\n");
			PRINT(sDebugBuf);
#endif
	  	//Restart_Con();
    	//goto Re_Write;
    }
   	Delay(50);

    Stop_Con();
}

/*BYTE I2c_Read(BYTE control, BYTE addr)
{
	BYTE rd_data;
Re_Read:
    Start_Con();

    I2c_DataOut(control);				// device address and R/W
    if(AckFlag()==0)
    {
    	Restart_Con();
    	goto Re_Read;
    }
    I2c_DataOut(addr);					// address
    if(AckFlag()==0)
    {
    	Restart_Con();
    	goto Re_Read;
    }
    Start_Con();
    I2c_DataOut(control+1);				// device address and R/W
    if(AckFlag()==0)
    {
    	Restart_Con();
    	goto Re_Read;
    }
    rd_data = I2c_DataIn();					// data read
    SDA = 1;								// --+- Not ack
    SCK = 1;								//   |
    SDA = 1;								//	 |
    SDA = 1;                                //	 |
//	Delay_Loop(100);	//眠啊
    SCK = 0;								//   |
    
//	Delay_Loop(100);	//眠啊
    Stop_Con();

    return(rd_data);
}*/