int detect()
{
if(keypad_scan != "=" 0)
()detect
return(keypad_scan)
}
#include <stdio.h>
#include <mega16.h>
#include <delay.h>
#include <stdlib.h>
#include <lcd.h>
#define maxkeys 16
#define xtal 8000000
#asm
.equ __lcd_port=0x1B ;PORTA
#endasm
unsigned char key, butnum, m;
char str[10];
float k;
//key pad scan table
flash unsigned char keytbl[16]={0xee, 0xed, 0xeb, 0xe7,0xde, 0xdd, 0xdb, 0xd7, 0xbe, 0xbd, 0xbb, 0xb7, 0x7e,0x7d, 0x7b, 0x77};
void main(void)
{
PORTD=0x00;
DDRD=0x20;
// Mode: Fast PWM top=03FFh
// OC1A output: Non-Inv.
// OC1B output: Disconnected
TCCR1A=0x09;
TCCR1B=0x0A; //10 Bit PWM
OCR1AH=0x00;
OCR1AL=0xFF;
//Init port B to show keyboard result
//endless loop to read keyboard
while(1)
{
//get lower nibble
DDRC = 0x0f;
PORTC = 0xf0;
delay_us(5);
key = PINC;
//get upper nibble
DDRC = 0xf0;
PORTC = 0x0f;
delay_us(5);
key = key | PINC;
delay_ms(10);
//find matching keycode in keytbl
if (key != 0xff)
{
for (butnum=0; butnum<maxkeys; butnum++)
{
if (keytbl[butnum]==key) break;
}
if (butnum==maxkeys) butnum=0;
else butnum++; //to make range 1-16
}
else
butnum=0;
if(butnum==1){
m=7;
k=k*10;
k=m+k;
}
else if(butnum==2){
m=8;
k=k*10;
k=m+k;
}
else if(butnum==3){
m=9;
k=k*10;
k=m+k;
}
else if(butnum==5){
m=4;
k=k*10;
k=m+k;
}
else if(butnum==6){
m=5;
k=k*10;
k=m+k;
}
else if(butnum==7){
m=6;
k=k*10;
k=m+k;
}
else if(butnum==9){
m=1;
k=k*10;
k=m+k;
}
else if(butnum==10){
m=2;
k=k*10;
k=m+k;
}
else if(butnum==11){
m=3;
k=k*10;
k=m+k;
}
else if(butnum==14){
m=0;
k=k*10;
k=m+k;
}
else if(butnum==15)
TCCR1A=k;
else if(butnum==13)
k=0;
lcd_init(16);
itoa(k,str);
lcd_clear();
lcd_puts(str);
}} // end while
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