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
}
#pragma code
//************************************************
//* Function: isr_high(void) *
//* High priority interrupt for Timer2 *
