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ensure analog pins are inputs

This commit is contained in:
Michael Moon 2010-10-26 01:02:07 +11:00
parent 4bdb97c3b7
commit 64f027f54e
1 changed files with 4 additions and 1 deletions
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5
analog.c
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@ -18,14 +18,17 @@ void analog_init() {
#elif defined PRR0
PRR0 &= ~MASK(PRADC);
#endif
ADMUX = REFERENCE;
// ADC frequency must be less than 200khz or we lose precision. At 16MHz system clock, we must use the full prescale value of 128 to get an ADC clock of 125khz.
ADCSRA = MASK(ADEN) | MASK(ADPS2) | MASK(ADPS1) | MASK(ADPS0);
adc_counter = 0;
adc_running_mask = 1;
DIDR0 = ANALOG_MASK & 0x1F;
DDRC &= ANALOG_MASK;
DIDR0 = ANALOG_MASK & 0x3F;
// now we start the first conversion and leave the rest to the interrupt
ADCSRA |= MASK(ADIE) | MASK(ADSC);