interfacing-seven-segment-display-with-lpc2148's Introduction

Interfacing-Seven-segment-display-with-lpc2148

Name: H.Syed Abdul Wasih Roll no: 212221240057 Date of experiment: 10/11/2022

Ex. No. : 08 Date: 10/11/2022

Aim:

To configure and display 4 character LED seven segment display and write a c code for displaying number 1 to 9 and A to F

Components required:

Proteus ISIS professional suite, Kiel μ vision 5 Development environment Figure-01 Internal circuit for seven segment MPX4 display

Theory:

7 Segment Display has seven segments in it and each segment has one LED inside it to display the numbers
by lighting up the corresponding segments. Like if you want the 7-segment to display the number "5" then
you need to glow segment a,f,g,c, and d by making their corresponding pins high. There are two types of 
7-segment displays: Common Cathode and Common Anode, here we are using Common Cathode seven segment display.

      Figure-02 Pin configuration for seven segment display

Below table shows the HEX values and corresponding digit according to LPC2148 pins for common cathode configuration.

Sl no Hex code Output of LCD 1 0x88 1 2 0xeb 2 3 0x4c 3 4 0x49 4 5 0x2b 5 6 0x19 6 7 0x18 7 8 0xcb 8 9 0x8 9 10 0x9 A 11 0xa B 12 0x38 C 13 0x9c D 14 0x68 E 15 0x1c F 16 0x1e 0

Figure -3 Circuit diagram of interfacing for LPX4 - CA

Kiel - Program:

#include <LPC214x.h>
unsigned char dig[]={0x88,0xeb,0x4c,0x49,0x2b,0x19,0x18,0xcb,0x8,0x9,0xa,0x38,0x9c,0x68};
void delay(unsigned int count)
{
	int i=0,j=0;
	for(j=0;j<count;j++)
	{
		for(i=0;i<120;i++);
	}
}
int main(void)
{
	unsigned char count=0;
	unsigned int i=0;
	IO0DIR|=(1<<11);
	IO0SET=(1<<11);
	IO0DIR|=0x007F8000;
	while(1)
	{
		count++;
		if(count==16)count=0;
		for(i=0;i<800;i++)
		{
			IO0CLR=0x007F8000;
			IO0SET=(dig[count]<<15);
			delay(20);
		}
	}
}

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