/*
Reading program key.
This program aims to read the state of a button on / off an LED.
*/

# define KEY1 PORTB.B0 // assign the name KEY1 to pin RB0
# define KEY2 PORTB.B1  // assign the name KEY2 to pin RB1
# define KEY3 PORTA.B5  // assign the name KEY3 to pin RA5

void main () {                         // main function of the program

unsigned state_key1= 0 ;       // set variables status flags for the keys
unsigned state_key2= 0 ;
unsigned state_key3= 0 ;

ADCON1 = 6;                        // set all pins A / D and I / O General purpose
TRISD=0;
TRISA =0XFF;
TRISB=0XFF;
PORTD = 0;
OPTION_REG.B7= 0;   // enable the internal resistors for PORTB pull-up pic

while(1) {

if (button (& portb, 0, 25, 0)) state_key1= 1;
if (button (& portb, 1, 25, 0)) state_key2= 1;
if (button (& porta, 5, 25, 0)) state_key3= 1;

if (state_key1&& button(&portb, 0, 25, 1)) {
PORTD = 0b10101010;
Delay_ms (200);
state_key1= 0;
}

if (state_key2&& button(&portb, 1, 25, 1)) {
PORTD = 0b01010101;
Delay_ms (200);
state_key2 = 0;
}

if (state_key3&& button(&porta, 5, 25, 1)) {
PORTD = 0b11111111;
Delay_ms (200);
state_key3= 0;
}
}
}