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Author: AashiDutt

LCD_Interface/LCD.c

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+//CODE FOR LCD INTERFACING WITH IC 8051 MICROCONTROLLER USING PROTEUS.
+
+#include<reg52.h>
+
+//    RS     RW     E       D0 -  D7
+//   P2.0   P2.1   P2.2   P1.0 - P1.7
+//#defining conections with port 2 pins
+sbit RS=P2^0;// means RS = P2.0 pin
+sbit RW=P2^1;
+sbit E=P2^2;
+
+// user defined functions
+void send_command(unsigned int command_value ) ;
+void send_data(unsigned int data_value) ; // function for passing data
+void ms_delay( unsigned int time);        // function for delay window
+
+void main()
+{
+	
+//LCD INITIALIZATION
+
+//2 lines and 5x7 matrix
+send_command(0x38);    // giving command to LCD (writting into command code register of LCD)
+
+//display on cursor blink
+send_command(0x0E);
+
+//clear display screen
+send_command(0X01);
+
+
+
+
+//PRINTING A CHARACTER
+
+while(1)
+{
+
+send_command(0x80)	; // force cursor on 1st line		
+send_data('H');
+send_data('E');
+send_data('L');
+send_data('L');
+send_data('O');
+
+	
+send_command(0xC0)	; // force cursor on 2nd line	
+	
+send_data('W');
+send_data('O');
+send_data('R');	
+send_data('L');
+send_data('D');
+}
+
+}
+
+// defining functions
+
+void send_command(unsigned int command_value )  // used to send command to Instruction Command Code Register
+{
+	P1=command_value; // write data to port pins
+	RW=0; // RW=0 to write data and RW=1 to read data
+	RS=0; // RS(register select )=0 to select instruction command code reg.
+	E=1;  // enable pin at active High 
+	ms_delay(10);
+	E=0;
+}	
+// after this the data present at port pins will latch(be present) in the  command code register of LCD
+
+void send_data(unsigned int data_value) // used to send data to Data Register
+{
+	P1=data_value;
+	RW=0;
+	RS=1; //RS(register select )=1 to select Data reg.
+	E=1;
+	ms_delay(10);
+	E=0;
+}
+// after this the data present at port pins will latch(be present) in the  Data register of LCD
+
+
+void ms_delay( unsigned int time)
+{
+	unsigned int i,j;
+	//time X 1ms
+	for(i=0;i<time;i++)
+	{
+		for(j=0;j<113;j++);  //1 ms delay
+	}
+}
+