//lock.c code to allow user to enter 4 characters on switches
//RC1,RC2,RC3,RC4 such that when RC1 is pressed 'A' is stored
//when RC2 is pressed 'B' is stored
//when RC3 is pressed 'C' is stored
//when RC4 is pressed 'D' is stored
//As soon as a set of 4 characters is stored in array key[]
//the program jumps out of the loop and loops continously
//doing nothing
//use watch window to view key[], i and PORTC
//use async stimulus to operate keys RC1-RC4
//use animated stepping
#include <pic.h>
void init(void);
void read_keys(void); 

unsigned char key[4]; //stores entered code
unsigned int i;

void init(void)
	{
	TRISC=0b00011110; //key inputs on RC4-RC1 = A,B,C,D
	i=0;
	}

void read_keys(void)
	{
	while(i<4)
		{
		while(PORTC==0){}; //wait until a key pressed
		if(RC1==1)
		{
		key[i]='A';
		i=i++;
		while(RC1==1){};
		}
		else 
		if(RC2==1)
		{
		key[i]='B';
		i=i++;
		while(RC2==1){};
		}
		else
		if(RC3==1)
		{
		key[i]='C';
		i=i++;
		while(RC3==1){};

		}
		else 
		if(RC4==1)
		{

		key[i]='D';
		i=i++;
		while(RC4==1){};

		}
	

	}

}
void main(void)
	{
	init();
	read_keys();
	while(1)
		{

void main(void)
	{
	init();
	read_keys();
	while(1)
		{
    // something must go here or it won't compile. 

void main(void)
    {
    init();
    read_keys();
    while(1)
        {
    }
}