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24LCxx讀寫EEPROM的實例(C語言)
24LCxx讀寫EEPROM的實例(C語言)
作者:佚名  來源:不詳  錄入:Admin  更新時間：2008-7-26 19:47:17  點擊數(shù)：3
【字體： 字體顏色】
//************************************************************************
//* 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 */

#include <p18f452.h>
#include <i2c.h>   // Load I2C Header file from defult direct
#include <timers.h>
#include "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 *
//************************************************
#pragma interrupt isr_high

void isr_high(void)
{
 PIR1bits.TMR2IF=0;     // Clear Timer2 interrupt Flag
 
 if (Debounce==0)
 {
  if (!SW2)
  { P_SW2=1; Debounce =Bounce_Time; }
  if (!SW6)
  { P_SW6=1; Debounce =Bounce_Time; }
 }  
 else if (SW2 & SW6)Debounce--;
   else Debounce =Bounce_Time;   
}        
#pragma code

//***********************************************
//* Write a Byte to EEPROM
//* - ctrl : Control Byte of EEPROM   
//* - addr : Location of EEPROM   
//* - data : Data Byte of EEPROM    
//***********************************************

void Initialize_Timer2(void)
{

  RCONbits.IPEN=1;   // Enable Interrupt Priority bit
  IPR1bits.TMR2IP=1;   // Set Timer2 for High Priority
  INTCONbits.GIEH=1;   // Enable High Priority Interrupt

  OpenTimer2 (TIMER_INT_ON  // Turn On the Timer2 with Interrupt
    & T2_PS_1_4   // (4Mhz/4) [4*10*(99+1)] = 4mS */
    & T2_POST_1_10);

  PR2 = 99;
}

//***********************************************
//* Write a Byte to EEPROM *
//* - ctrl : Control Byte of EEPROM   *
//* - addr : Location of EEPROM   *
//* - data : Data Byte of EEPROM    *
//***********************************************
void EEPROM_Write(unsigned char ctrl,unsigned char addr,unsigned char data)
{
 IdleI2C();     // ensure module is idle
 StartI2C();      // Start condition
 I2C_Done();      // Wait Start condition completed and clear SSPIF flag    

 WriteI2C(ctrl);     // Write Control+Write to EEPROM & Check BF flag
 while(SSPCON2bits.ACKSTAT);  // wait until received the Acknowledge from EEPROM
 I2C_Done();      // Clear SSPIF flag

 WriteI2C(addr);     // Write Address to EEPROM
 while(SSPCON2bits.ACKSTAT);  // wait until received the Acknowledge from EEPROM
 I2C_Done();

 WriteI2C(data);     // Write Data to EEPROM
 while(SSPCON2bits.ACKSTAT);  // wait until received the Acknowledge from EEPROM
 I2C_Done();

 StopI2C();      // Stop condition
 I2C_Done();      // Wait the Stop condition completed
}

//***********************************************
//* Pae Write to EEPROM
//*
//* - ctrl : Control Byte of EEPROM
//* - addr : Location of EEPROM   
//* - length : Write counter
//* - *dptr : RAM point --> EEPROM
//*
//***********************************************
void EE_Page_Write(unsigned char ctrl,unsigned char addr,unsigned char length,unsigned char *dptr)
{
 IdleI2C();    // ensure module is idle
 StartI2C();      // Start condition
 I2C_Done();      // Wait Start condition completed
 
 WriteI2C(ctrl);     // Write Control+Write to EEPROM & Check BF flag
 while(SSPCON2bits.ACKSTAT);  // wait until received the Acknowledge from EEPROM
 I2C_Done();      // Clear SSPIF flag

 WriteI2C(addr);     // Write Address to EEPROM
 while(SSPCON2bits.ACKSTAT);  // wait until received the Acknowledge from EEPROM
 I2C_Done();

 while (length!=0)    // Check write completed ?
 {
  WriteI2C(*dptr);   // Write data to EEPROM
  while(SSPCON2bits.ACKSTAT); // wait until received the Acknowledge from EEPROM
  I2C_Done(); 
  dptr++;      // Point to next byte
  length--;
 }
 
 StopI2C();      // Stop condition
 I2C_Done();      // Wait the Stop condition completed
} 
 
//***********************************************
//* EEPROM Acknowledge Polling *
//* -- The routine will polling the ACK  *
//* response from EEPROM     *
//* -- ACK=0 return        *
//*  -- ACK=1 send Restart & loop check  *
//***********************************************
void EEPROM_ACK(unsigned char ctrl)
{
 unsigned char i;

 IdleI2C();    // ensure module is idle
 StartI2C();      // Start condition
 I2C_Done();      // Wait Start condition completed

 WriteI2C(ctrl);     // Write Control to EEPROM (WRITE)
 I2C_Done();      // Clear SSPIF flag

 while (SSPCON2bits.ACKSTAT)  // test for Acknowledge from EEPROM
{
  for (i=0;i<100;i++);  // Delay for next Repet-Start

 RestartI2C();  // initiate Repet-Start condition
  I2C_Done();    // Wait Repet-Start condition completed

  WriteI2C(ctrl);    // Write Control to EEPROM (WRITE)
  I2C_Done();      // Clear SSPIF flag
}
 StopI2C(); // send STOP condition
 I2C_Done();      // wait until stop condition is over
}

//***********************************************
//* Random Read a Byte from EEPROM *
//* - ctrl : Control Byte of EEPROM (Write) *
//* (Ctrl +1 ) : Read Command    *
//* - addr : Address Byte of EEPROM   *
//* - Return : Read Data from EEPROM   *
//***********************************************
unsigned char EEPROM_Read(unsigned char ctrl,unsigned char addr)
{
 unsigned char f;
 
 IdleI2C();    // ensure module is idle
 StartI2C();      // Start condition
 I2C_Done();      // Wait Start condition completed

 WriteI2C(ctrl);     // Write Control to EEPROM
while(SSPCON2bits.ACKSTAT);  // test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 WriteI2C(addr);     // Write Address to EEPROM
while(SSPCON2bits.ACKSTAT);  // test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 RestartI2C();   // initiate Restart condition
 I2C_Done();

 WriteI2C(ctrl+1);    // Write Control to EEPROM
 while(SSPCON2bits.ACKSTAT);  // test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 f=ReadI2C();     // Enable I2C Receiver & wait BF=1 until received data
 I2C_Done();      // Clear SSPIF flag

 NotAckI2C();     // Genarate Non_Acknowledge to EEPROM
 I2C_Done(); 

StopI2C();  // send STOP condition
 I2C_Done();      // wait until stop condition is over

 return(f);      // Return Data from EEPROM
}

//***********************************************
//* Sequential Read from EEPROM
//*
//* - ctrl : Control Byte of EEPROM
//* - addr : Location of EEPROM   
//* - length : Read counter
//* - *dptr : Store EEPROM data to RAM
//*
//***********************************************
void EE_SEQU_Read(unsigned char ctrl,unsigned char addr,unsigned char length,unsigned char *dptr)
{
 IdleI2C();    // ensure module is idle
 StartI2C();      // Start condition
 I2C_Done();      // Wait Start condition completed

 WriteI2C(ctrl);     // Write Control to EEPROM
while(SSPCON2bits.ACKSTAT);  // test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 WriteI2C(addr);     // Write Address to EEPROM
while(SSPCON2bits.ACKSTAT);  // test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 RestartI2C();   // initiate Restart condition
 I2C_Done();

 WriteI2C(ctrl+1);    // Write Control to EEPROM
 while(SSPCON2bits.ACKSTAT);  // Test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 while (length!=0)
 {
  *dptr=ReadI2C();   // Enable I2C Receiver & Store EEPROM data to Point buffer
  I2C_Done(); 
  dptr++; 
  length--;
    
  if (length==0) NotAckI2C();
  else AckI2C();    // Continue read next data, send a acknowledge to EEPROM
  
  I2C_Done();
 }

StopI2C();  // send STOP condition
 I2C_Done();      // wait until stop condition is over
}

//***********************************************
//* Check I2C action that is completed *
//***********************************************
void I2C_Done(void)
{
 while (!PIR1bits.SSPIF);  // Completed the action when the SSPIF is Hi.
 PIR1bits.SSPIF=0;    // Clear SSPIF
}

//************************************************
//* Initial I2C Master Mode with 7 bits Address *
//* Clock Speed : 100KHz @4MHz      *
//************************************************
void Initialize_I2C_Master(void)
{
 OpenI2C(MASTER,SLEW_ON);
 SSPADD= 9;
}
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