void adc_init(void)
{
ADCSRA = 0x00; //Disable ADC
ADMUX = 0x03;
ACSR = 0x80; //Disable analog comparator
ADCSRB = 0x00;
ADCSRA = 0x83;
}
uint read_adc(void)
{
uint temp = 0;
ADCSRA |= (1 << ADSC); // Enable AD conversion, first conversion, result discarded
while((ADCSRA & (1 << ADIF)) == 0); //Wait for AD conversion to finish
ADCSRA |= (1 << ADIF); //Write 1 to clear ADIF, as required by the specification
ADCSRA |= (1 << ADSC); // Enable AD conversion, second conversion, the result is retained
while((ADCSRA & (1 << ADIF)) == 0); //Wait for AD conversion to finish
ADCSRA |= (1 << ADIF);
temp = ADCL;
temp |= (int)(ADCH << 8);
return temp;
}
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