AT89S52 Mini Development Board – EEPROM Interfacing
The AT89S52 Development Board (Mini) has an on board external 24C04 EEPROM (Electrically Erasable And Programmable Read-Only Memory) interfaced over I2C. The 24C04 provides 4096 bits of serial EEPROM organized as 512 words of 8 bits each. For interfacing make sure you had short the jumpers at J11 (SCL)and J10(SDA).
Schematic
Sample Code
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/******************************************************************************** HEADER FILES *********************************************************************************/ #include <REGX52.H> #include <intrins.h> #define Lcd_Port P0 #define EN P1_0 #define RS P1_2 #define RW P1_1 #define LED1 P1_5 #define LED2 P1_4 #define SW1 P2_0 /******************************************************************************** FUNCTION DECLARATIONS *********************************************************************************/ void Eeprom_Save(void); void Eeprom_Read(void); void Lcd_Initial(void); void Lcd_Command(char); void Lcd_Data(char); unsigned char byte1,byte2; void Delay(unsigned int count); void Lcd_Display(unsigned char locn,const char *dat); /******************************************************************************** VARIABLE DECLARATIONS *********************************************************************************/ sbit sda=P3^4; sbit scl=P3^5; bit ack; unsigned char reead,write,write2; /******************************************************************************** MAIN FUNCTION *********************************************************************************/ void main() { Lcd_Initial(); while(1) { if(SW1==0) { Lcd_Display(0x80,"Sent :"); Lcd_Display(0xC0,"Read :"); Eeprom_Save(); Eeprom_Read(); Delay(250); } } } /******************************************************************************** * Function : Start * * * * Description : Function to give Start bit to EEPROM * * * * Parameters : None * *********************************************************************************/ void Start(void) { sda=1; scl=1; _nop_(); _nop_(); sda=0; scl=0; } /******************************************************************************** * Function : Stop * * * * Description : Function to give Stop bit to EEPROM * * * * Parameters : None * *********************************************************************************/ void Stop(void) { sda=0; scl=1; _nop_(); _nop_(); sda=1; scl=0; } /******************************************************************************** * Function : Aknowledge * * * * Description : Function to give acknowledge to EEPROM * * * * Parameters : None * *********************************************************************************/ void Aknowledge(void) { scl=1; _nop_(); _nop_(); scl=0; } /******************************************************************************** * Function : Send_Byte * * * * Description : Function to sent data to EEPROM * * * * Parameters : None * *********************************************************************************/ void Send_Byte(unsigned char value) { unsigned int i; unsigned char send; send=value; for(i=0;i<8;i++) { sda=send/128; send=send<<1; scl=1; _nop_(); _nop_(); scl=0; } ack=sda; sda=0; } /******************************************************************************** * Function : Read_Byte * * * * Description : Function to read data from EEPROM * * * * Parameters : None * *********************************************************************************/ unsigned char Read_Byte(void) { unsigned int i; sda=1; reead=0; for(i=0;i<8;i++) { reead=reead<<1; scl=1; _nop_(); _nop_(); if(sda==1) reead++; scl=0; } sda=0; return reead; } /******************************************************************************** * Function : Eeprom_Save * * * * Description : Function to store data in EEPROM * * * * Parameters : None * *********************************************************************************/ void Eeprom_Save(void) { Start(); Send_Byte(0xA0); Aknowledge(); Send_Byte(0x07); Aknowledge(); Send_Byte(5); Aknowledge(); Send_Byte(65); Aknowledge(); Stop(); if(ack==0) { LED1=0; Delay(100); LED1=1; Delay(100); Lcd_Display(0x86,"5A"); } else LED2=0; Aknowledge(); } /******************************************************************************** * Function : Eeprom_Read * * * * Description : Function to Read data from EEPROM * * * * Parameters : None * *********************************************************************************/ void Eeprom_Read(void) { Start(); Send_Byte(0xA0); Aknowledge(); Send_Byte(0x07); Aknowledge(); Start(); Send_Byte(0xA1); Aknowledge(); byte1=Read_Byte(); Aknowledge(); byte2=Read_Byte(); Aknowledge(); Stop(); if(byte1==5) { LED2=0; Delay(100); LED2=1; Delay(100); write=byte1+48; Lcd_Command(0xC6); Lcd_Data(write); } else LED1=1; if(byte2==65) { Lcd_Command(0xC7); Lcd_Data(byte2); } Aknowledge(); } /******************************************************************************** * Function : Lcd_Initial * * * * Description : Function to initialise LCD * * * * Parameters : None * *********************************************************************************/ void Lcd_Initial(void) { Lcd_Command(0x30); Lcd_Command(0x30); Lcd_Command(0x30); Lcd_Command(0x38); Lcd_Command(0x01); Lcd_Command(0x06); Lcd_Command(0x0c); Lcd_Command(0x80); } /******************************************************************************** * Function : Lcd_Command * * * * Description : Function to give command to LCD * * * * Parameters : value - command * *********************************************************************************/ void Lcd_Command(char value) { RW=0; RS=0; EN=1; Lcd_Port=value; Delay(1); EN=0; } /******************************************************************************** * Function : Lcd_Data * * * * Description : Function to give data for displayto LCD * * * * Parameters : value - data * *********************************************************************************/ void Lcd_Data(char value) { RW=0; RS=1; EN=1; Lcd_Port=value; Delay(1); EN=0; } /******************************************************************************** * Function : Lcd_Display * * * * Description : Function to display string on LCD * * * * Parameters : locn - address , dat - string * *********************************************************************************/ void Lcd_Display(unsigned char locn,const char *dat) { RS=0; RW=0; EN=1; Lcd_Port=locn; Delay(1); EN=0; while(*dat!='\0') { RS=1; RW=0; EN=1; Lcd_Port=*dat; Delay(1); EN=0; dat++; } } /******************************************************************************** * Function : Delay * * * * Description : Function for Delay * * * * Parameters : count - Delay time * *********************************************************************************/ void Delay(unsigned int count) { int x,y; for(x=0;x<count;x++) for(y=0;y<1275;y++); } |
Topics related to AT89S52 Mini Development Board
- AT89S52 Mini Development Board – Overview
- AT89S52 Mini Development Board – LED Interfacing
- AT89S52 Mini Development Board – LCD Interfacing
- AT89S52 Mini Development Board – Serial communication
- AT89S52 Mini Development Board – EEPROM Interfacing
- AT89S52 Mini Development Board – Buzzer Interfacing
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- AT89S52 Mini Development Board – Switch Interfacing
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