EEPROM.rar_I AM

/************************************************************************************************ File Name : EEPROM interfacing Controller : P89v51RD2 Description : Code to interface EEPROM and particulur page read and display on uart Author : Nagaraj Navalagund Company : Elegance Technologies *************************************************************************************************/ /************************************************************************************************* Header Files *************************************************************************************************/ #include<e.h> //Include header file lcd that contains lcd command and data function defenitions. /************************************************************************************************* Function Name : Main Return Type : void Description : Function to initialise the EEPROM and particulur page read and display on uart *******************************************************************************************/ void main(void) { unsigned char Edata[19]; unsigned char st[20]="elegancetechnologes";// given string UART();//uart unilization EEPROM_WriteString(0xF1,st);//eepron writeing delay(1); EEPROM_ReadString(0xF1,Edata);//eeprom reading Edata[19]=0x00; UART_TxString(Edata);//uart trasmitting // while(1); } /************************************************************************************************ Function Name : i2c clock Return Type : void Description : Function to initialise the clock *******************************************************************************************/ unsigned int z; void I2C_Clock() { delay(1); SCL = 1; delay(1); SCL = 0; } /************************************************************************************************ Function Name : i2c start Return Type : void Description : Function to initialise the scl and sdl lines *******************************************************************************************/ void I2C_Start() { SCL = 0; SDA = 1; //setting the pin delay(1); SCL = 1; delay(1); SDA = 0; //disable pin delay(1); SCL = 0; } /************************************************************************************************ Function Name : i2c stop Return Type : void Description : Function to initialise the scl and sdl lines *******************************************************************************************/ void I2C_Stop() { SCL = 0; delay(1); SDA = 0; delay(1); SCL = 1; //setting pin delay(1); SDA = 1; //setting the pin } /************************************************************************************************ Function Name : i2c write Return Type : void Description : Function to initialise the write a word on i2c *******************************************************************************************/ void I2C_Write(unsigned char dat) { unsigned char i; for(i=0;i<8;i++) { SDA = dat & 0x80; //we are settinh up 9- carry I2C_Clock(); //i2c clock dat = dat<<1;//data sending 1 and set a byte (8-bits) delay(1); } SDA = 1; } /************************************************************************************************ Function Name : i2c read Return Type : void Description : Function to initialise the to i2c *******************************************************************************************/ unsigned char I2C_Read(void) { unsigned char i, dat=0x00; SDA=1; //I/P for(i=0;i<8;i++) // data { delay(1); SCL = 1; delay(1); dat = dat<<1; //dat is Shifted each time and dat = dat | SDA; //ORed with the received bit to pack into byte SCL = 0; } return dat; } /************************************************************************************************ Function Name : i2c acknolgment Return Type : void Description : Function to initialise the acknolgement *******************************************************************************************/ void I2C_Ack() { SDA = 0; I2C_Clock(); SDA = 1; //printf("ack \n"); } /************************************************************************************************ Function Name : i2c no acknoledgment Return Type : void Description : Function to initialise the no ack *******************************************************************************************/ void I2C_NoAck() { SDA = 1; I2C_Clock(); SCL = 1; // printf("ack no\n"); } /************************************************************************************************ Function Name : delay Return Type : void Description : Function to initialise the delay *******************************************************************************************/ void delay(unsigned int z) { int j,i; for(i=0;i<z;i++) for(j=0;j<1275;j++);//1i sec dealy } /************************************************************************************************ Function Name : uart transmetting Return Type : void Description : Function to initialise the tranmiting char *******************************************************************************************/ void UART_TxChar(char ch) { SBUF=ch; //setting buf while(TI==0); //until it recevie TI=0; //stop transmetting } /************************************************************************************************ Function Name : uart Return Type : void Description : Function to initialise the uart *******************************************************************************************/ void UART() { TMOD |=0x20;//timer 0 and mode 2(8-bit) TH1=-3; //9600 board rate SCON=0x50; //setting serial buff for uart TR1=1; // } /************************************************************************************************ Function Name : transmeting string Return Type : void Description : Function to initialise the transmeting string *******************************************************************************************/ void UART_TxString(char *string_ptr) { while(*string_ptr)//string address UART_TxChar(*string_ptr++); //trtasmetting char with inc address } /************************************************************************************************ Function Name : EEPOROM Return Type : void Description : Function to initialise the eeprom write *******************************************************************************************/ void EWrite(unsigned char eeprom_Address, unsigned char eeprom_Data) { I2C_Start(); I2C_Write(EEPROM_ID); //device address I2C_Ack();//i2c acknoledment I2C_Write(eeprom_Address);//Select the Specified EEPROM address of AT2408 I2C_Ack(); I2C_Write(eeprom_Data); // Write the data at specified address I2C_Ack(); I2C_Stop(); delay(1); } /************************************************************************************************ Function Name : Main Return Type : void Description : Function to initialise the LCD and display the string and charecters on LCD *******************************************************************************************/ unsigned char ERead(unsigned char eeprom_Address) { unsigned char eData; I2C_Start(); I2C_Write(EEPROM_ID); //Select the Specified EEPROM address of AT2408 I2C_Ack(); I2C_Write(eeprom_Address); // Write the data at specified address I2C_Ack(); I2C_Start(); I2C_Write(0xA7); // connect I2c Bus I2C_Ack();