/*

ADC and bar graph display the Orangutan, ATmega168, 8 MHz clock
S. James Remington  sjames_remington at yahoo dot com

This program reads the tiny pot attached to ADC channel 7 on the Orangutan and displays the
value as an integer and a bar graph on the LCD display. 

Yes, a GUI for your O!

*/

#include <avr/io.h>
#include <stdlib.h>

#define F_CPU 8000000UL  //CPU clock frequency for delays
#include <util/delay.h>

void ADC_init()
{
	ADMUX =  7;						//set to right adjust, reference is AREF and ADC channel to 7
	ADCSRA = (1<<ADEN) |(6<<ADPS0); //6=ADC clock division factor 64 (8MHz / 64 = 125kHz). Use 7 for baby O.
									//interrupts disabled
}

unsigned int ADC_get(unsigned char channel)
{
	unsigned int ret;
	ADMUX = (ADMUX & 0xF0) | (channel & 0x0F);
	ADCSRA |= (1<<ADSC);				//Start conversion
	while (bit_is_set(ADCSRA,ADSC));	//wait for ADC to finish conversion
	ret = ADCL;							//result MUST be read low byte first!!
	ret |= (ADCH<<8);					//or in high byte
	return  ret;
}

//include the LCD display routines
#include "lcd_bargraph.c"

int main(void)
{ 
	unsigned int i,adcval;
	char buf[8];
// Initialize LCD display and ADC
	LCDInit();
	ADC_init();

	while (1) 
	{
		adcval=ADC_get(7);		
		itoa(adcval,buf,10);						//convert integer to ascii
		LCDSendCommand(LCD_Line1);					//display it
		LCDPrintString(buf);
		LCDSendCommand(LCD_Line2);
		LCDBar(adcval,1024,8);
		for(i=1; i<20; i++) _delay_ms(10);	//wait a bit
		}
return 0;
}