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taror002_lab4_part1.c
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taror002_lab4_part1.c
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/*
* taror002_lab4_part1.c
*
* Created: 4/19/2018 7:48:48 AM
* Author : Tanish
*/
#include <avr/io.h>
enum LA_States { LA_SMStart, init, check, increment, decrement, wait, wait1, reset } LA_State;
#define A0 (~PINA & 0x01)
#define A1 (~PINA & 0x02)
void TickFct_LED()
{
switch(LA_State) { // Transitions
case LA_SMStart: // Initial transition
LA_State = init;
break;
case init:
LA_State = check;
break;
case check:
if(!A0 && !A1){
LA_State = check;
}else if(A0 && !A1){
LA_State = increment;
}else if(!A0 && A1){
LA_State = decrement;
}else if(A0 && A1){
LA_State = reset;
}
break;
case increment:
LA_State = wait;
break;
case decrement:
LA_State = wait1;
break;
case wait:
if(A0 && A1){
LA_State = reset;
}else if(!A0 ){ //&& !A1
LA_State = check;
}else if (A0 ){//&& !A1
LA_State = wait;
}
break;
case wait1:
if(A0 && A1){
LA_State = reset;
}else if(!A1){
LA_State = check;
}else if(A1){
LA_State = wait1;
}
break;
case reset:
LA_State = check;
break;
default:
LA_State = LA_SMStart;
break;
} // Transitions
switch(LA_State) { // State actions
case init:
PORTC = 0x00;
break;
case check:
break;
case increment:
if( PORTC < 9 ){
PORTC = PORTC + 1;
}
break;
case decrement:
if( PORTC > 0 ){
PORTC = PORTC - 1;
}
break;
case wait:
break;
case wait1:
break;
case reset:
PORTC = 0x00;
break;
default:
break;
} // State actions
}
int main(void) {
DDRA=0x00; PORTA=0xFF;
DDRC=0xFF; PORTC=0x00;
PORTC = 0x00; // Initialize outputs
LA_State = LA_SMStart; // Indicates initial call
while(1) {
TickFct_LED();
}
}