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PIC:读写24LCxx系列的EEPROM的实例C语言程序

//*********************************************************
//* Using I2C Master Mode for access Slave (EEPRM)
//*
//* Written by: Richard Yang
//* Sr. Corporate Application Engineer
//* Microchip Technology Inc.
//* Date: Oct. 3nd '2002
//* Revision: 1.00
//* Language tools : MPLAB-C18 v2.09.13
//* MPLINK v3.10
//* MPLAB-IDE v6.00.17 ICD2
//***********************************************************
/* Include Header files */

＃i nclude p18f452.h>
＃i nclude i2c.h> // Load I2C Header file from defult direct
＃i nclude timers.h>
＃i nclude P18LCD.h // Load P18LCD Header file form current working direct

/* Declare the Function Prototype */

void Initialize_I2C_Master(void);
void EE_Page_Write(unsigned char,unsigned char,unsigned char,unsigned char *);
void EE_SEQU_Read(unsigned char,unsigned char,unsigned char,unsigned char *);
void EEPROM_Write(unsigned char,unsigned char,unsigned char);
void EEPROM_ACK(unsigned char);
unsigned char EEPROM_Read(unsigned char,unsigned char);
void I2C_Done(void);
void Initialize_Timer2(void);
void isr_high_direct(void);
void isr_high(void);

#pragma romdata My_romdata=0x1000
const rom far unsigned char LCD_MSG1[]=SW2: Byte Write ;
const rom far unsigned char LCD_MSG2[]=SW6: Random Read;
const rom far unsigned char LCD_MSG3[]=Byte Write Mode ;
const rom far unsigned char LCD_MSG4[]=Random Read Mode;
const rom far unsigned char LCD_MSG5[]=Sended: ;
const rom far unsigned char LCD_MSG6[]=Send: ;
const rom unsigned char I2C_Write_Buffer[]=Microchip Technology;
#pragma romdata

/* Define following array in data memory */

unsigned char I2C_Read_Buffer [32];

/* define following variable in data memory at Access Bank */
#pragma udata access My_RAM
near unsigned char Debounce;
near unsigned char Send_Addr;
near unsigned char Send_Data;
near unsigned char Send_Length;
near unsigned char Read_Data;
near unsigned char P_SW2;
near unsigned char P_SW6;
#pragma udata

#define Page_Length 8
#define SW2 PORTAbits.RA4
#define SW6 PORTEbits.RE1
#define Bounce_Time 6
#define EE_CMD 0xA0

//***********************************************************
/* */
/* Main Program */
/* */
//***********************************************************

void main(void)
{
ADCON1=0b00000110; // Disable A/D Function
TRISAbits.TRISA4=1; // Set SW2 for input
TRISEbits.TRISE1=1; // Set SW6 for Input
Initialize_Timer2( );
Initialize_I2C_Master( );
OpenLCD( );

if (SW2 SW6)Debounce=0;
else Debounce = Bounce_Time;

while(1)
{
LCD_Set_Cursor(0,0); // Put LCD Cursor on (0,0)
putrsLCD(LCD_MSG1);
LCD_Set_Cursor(1,0); // Put LCD Cursor on (1,0)
putrsLCD(LCD_MSG2);

P_SW2=P_SW6=0;
Send_Addr=0;

while(1)
{
if (P_SW2)
{
P_SW2=0;
Debounce = Bounce_Time;
LCD_Set_Cursor(0,0); // Put LCD Cursor on (0,0)
putrsLCD(LCD_MSG3);
LCD_Set_Cursor(1,0); // Put LCD Cursor on (0,0)
putrsLCD(LCD_MSG5);

do
{
while (!P_SW2);
P_SW2=0;
LCD_Set_Cursor(1,8);
Send_Data=I2C_Write_Buffer[Send_Addr];
EEPROM_Write(EE_CMD,Send_Addr,Send_Data);
puthexLCD(EE_CMD);
putcLCD(' ');
puthexLCD(Send_Addr);
putcLCD(' ');
puthexLCD(Send_Data);
EEPROM_ACK(EE_CMD);
Send_Addr++;
} while (I2C_Write_Buffer[Send_Addr]!=0x00);
break;
}

if (P_SW6)
{
P_SW6=0;
Debounce = Bounce_Time;
LCD_Set_Cursor(0,0); // Put LCD Cursor on (0,0)
putrsLCD(LCD_MSG4);
LCD_Set_Cursor(1,0); // Put LCD Cursor on (0,0)
putrsLCD(LCD_MSG6);


while(1)
{
if (P_SW6)
{
P_SW6=0;
LCD_Set_Cursor(1,5);
Read_Data = EEPROM_Read(EE_CMD,Send_Addr);
puthexLCD(EE_CMD);
putcLCD(' ');
puthexLCD(Send_Addr);
putcLCD(' ');
puthexLCD(EE_CMD);
putcLCD(' ');
puthexLCD(Read_Data);
Send_Addr++;
}
if (P_SW2) break;
}
if (P_SW2) break;
}
if (P_SW2)
{
P_SW2=0;
break;
}
}
}
}
//************************************************
//* #pragma Interrupt Declarations *
//* *
//* Function: isr_high_direct *
//* - Direct execution to the actual *
//* high-priority interrupt code. *
//************************************************
#pragma code isrhighcode = 0x0008

void isr_high_direct(void)
{
_asm //begin in-line assembly
goto isr_high //go to isr_high function
_endasm //end in-line assembly
}