/* analog_input.c 
 * run '$ make' to check for erors,
 * '$ make writeflash' to compile and upload
 */



 #define F_CPU 1000000L // Define software reference clock for delay duration
 
 #include <avr/io.h>
 #include <util/delay.h>
 
 #define LED1 PB0 // Define led ext output pin on PB2
 #define LED2 PB1 
 
 int i; // 8 bits integer

 void delay(int ms) {
   int i;
   for (i=0; i<ms; i++) {
     _delay_ms(1);
   }
 }

 int main(void){
   int val_1 = 0;
   int low_val_1 = 0;
   int high_val_1 = 0;
   int val_2 = 0;
   int low_val_2 = 0;
   int high_val_2 = 0;
   DDRB |= (1 << LED1); // Set output direction on LED
   DDRB |= (1 << LED2);
   ADCSRA |= (1 << ADEN)| // Analog-Digital enable bit
   // set prescaler to 8 (clock / 8) 
   (1 << ADPS1)|(1 << ADPS0);
   while(1){
	 //Read ADC2L:
     ADMUX |= 2; //set the pin that the adc reads to ADC2 (PB4)
     ADCSRA |= (1 << ADEN); // Analog-Digital enable bit
     ADCSRA |= (1 << ADSC); // Discard first conversion
     while (ADCSRA & (1 << ADSC)); // wait until conversion is done
     ADCSRA |= (1 << ADSC); // start single conversion
     while (ADCSRA & (1 << ADSC)) // wait until conversion is done
     ADCSRA &= ~(1<<ADEN); // shut down the ADC
     low_val_1 = ADCL;
     high_val_1 = ADCH;
	 val_1 = (high_val_1<<8)|low_val_1;
	 
	 //Clear bottom 3 bits of ADMUX:
	 ADMUX &= ~(0x111);
	 
	 //Read ADC3:
     ADMUX |= 3; //set the pin that the adc reads to ADC2 (PB4)
     ADCSRA |= (1 << ADEN); // Analog-Digital enable bit
     ADCSRA |= (1 << ADSC); // Discard first conversion
     while (ADCSRA & (1 << ADSC)); // wait until conversion is done
     ADCSRA |= (1 << ADSC); // start single conversion
     while (ADCSRA & (1 << ADSC)) // wait until conversion is done
     ADCSRA &= ~(1<<ADEN); // shut down the ADC
     low_val_2 = ADCL;
     high_val_2 = ADCH;
	 val_2 = (high_val_2<<8)|low_val_2;
	
	 //Blink the LEDs
	 PORTB ^= (1 << LED1); //invert the state of the LED pin 
	 delay(val_1);
     PORTB ^= (1 << LED1); // - -
     PORTB ^= (1 << LED2); // - -
	 delay(val_2);
     PORTB ^= (1 << LED2); // - -
	 //for (i = 0 ; i < val_1 ; i++){
     //  _delay_ms (1); // Loop delay
     //}
	 //Clear bottom 3 bits of ADMUX:
	 ADMUX &= ~(0x111);
   }
   return 0;
 }