Keypad Interface with ARM LPC2148

Source Code:

#include<lpc214x.h>

void delay(unsigned int);

unsigned int seg[]={0x00000006,0x0000005B,0x0000004F,0x00000066,0x0000006D,0x0000007D,0x00000007,0x0000007F,0x0000006F,0x0000003F};

#define c0 0x00010000

#define c1 0x00020000

#define c2 0x00040000

#define r0 0x00080000

#define r1 0x00100000

#define r2 0x00200000

#define r3 0x00400000

int main(void)

{

IO0DIR=0x000000FF;

IO1DIR=0x00780000;

while(1)

{ 

IO1CLR|=r0;

IO1SET|=(r1|r2|r3);

if(!(IO1PIN& c0))

{

while(!(IO1PIN&c0));

IO0CLR=(seg[1]|seg[2]|seg[3]|seg[4]|seg[5]|seg[6]|seg[7]|seg[8]|seg[9]);

IO0SET=seg[0];

}

if(!(IO1PIN&c1))

{

while(!(IO1PIN&c1));

IO0CLR=(seg[0]|seg[2]|seg[3]|seg[4]|seg[5]|seg[6]|seg[7]|seg[8]|seg[9]);

IO0SET=seg[1];

}

if(!(IO1PIN&c2))

{

while(!(IO1PIN&c2));

IO0CLR=(seg[0]|seg[1]|seg[3]|seg[4]|seg[5]|seg[6]|seg[7]|seg[8]|seg[9]);

IO0SET=seg[2];

}

IO1CLR|=r1;

IO1SET|=(r0|r2|r3);

if(!(IO1PIN & c0))

{

while(!(IO1PIN& c0));

IO0CLR=(seg[1]|seg[2]|seg[0]|seg[4]|seg[5]|seg[6]|seg[7]|seg[8]|seg[9]);

IO0SET=seg[3];

}

if(!(IO1PIN& c1))

{

while(!(IO1PIN& c1));

IO0CLR=(seg[1]|seg[2]|seg[3]|seg[0]|seg[5]|seg[6]|seg[7]|seg[8]|seg[9]);

IO0SET=seg[4];

}

if(!(IO1PIN& c2))

{

while(!(IOPIN1& c2));

IO0CLR=(seg[1]|seg[2]|seg[3]|seg[4]|seg[0]|seg[6]|seg[7]|seg[8]|seg[9]);

IO0SET=seg[5];

}

IO1CLR|=r2;

IO1SET|=(r1|r0|r3);

if(!(IO1PIN& c0))

{

while(!(IO1PIN& c0));

IO0CLR=(seg[1]|seg[2]|seg[3]|seg[4]|seg[5]|seg[0]|seg[7]|seg[8]|seg[9]);

IO0SET=seg[6];

}

if(!(IO1PIN& c1))

{

while(!(IO1PIN& c1));

IO0CLR=(seg[1]|seg[2]|seg[3]|seg[4]|seg[5]|seg[6]|seg[0]|seg[8]|seg[9]);

IO0SET=seg[7];

}

if(!(IO1PIN& c2))

{

while(!(IO1PIN& c2));

IO0CLR=(seg[1]|seg[2]|seg[3]|seg[4]|seg[5]|seg[6]|seg[7]|seg[0]|seg[9]);

IO0SET=seg[8];

}

IO1CLR|=r3;

IO1SET|=(r1|r2|r0);

if(!(IO1PIN& c1))

{

while(!(IO1PIN& c1));

IO0CLR=(seg[1]|seg[2]|seg[3]|seg[4]|seg[5]|seg[6]|seg[7]|seg[8]|seg[0]);

IO0SET=seg[9];

}

}

}

void delay(unsigned int count)

 { int i,j;

  

for(i=count;i>0;i++)

{

for(j=0;j<count;j++);

}

}

Circuit Diagram: