Created
November 3, 2017 08:01
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| const byte adcPin = 0; // A0 | |
| const int MAX_RESULTS = 256; | |
| volatile int results [MAX_RESULTS]; | |
| volatile int resultNumber; | |
| // ADC complete ISR | |
| ISR (ADC_vect) | |
| { | |
| if (resultNumber >= MAX_RESULTS) | |
| ADCSRA = 0; // turn off ADC | |
| else | |
| results [resultNumber++] = ADC; | |
| } // end of ADC_vect | |
| EMPTY_INTERRUPT (TIMER1_COMPB_vect); | |
| void setup () | |
| { | |
| Serial.begin(115200); // set baudrate | |
| Serial.println(); | |
| // reset Timer 1 | |
| TCCR1A = 0; | |
| TCCR1B = 0; | |
| TCNT1 = 0; | |
| TCCR1B = bit (CS11) | bit (WGM12); // CTC, prescaler of 8 | |
| TIMSK1 = bit (OCIE1B); | |
| OCR1A = 39; | |
| OCR1B = 39; // 20 uS - sampling frequency 50 kHz | |
| ADCSRA = bit (ADEN) | bit (ADIE) | bit (ADIF); // turn ADC on, want interrupt on completion | |
| ADCSRA |= bit (ADPS2); // Prescaler of 16 | |
| ADMUX = bit (REFS0) | (adcPin & 7); | |
| ADCSRB = bit (ADTS0) | bit (ADTS2); // Timer/Counter1 Compare Match B | |
| ADCSRA |= bit (ADATE); // turn on automatic triggering | |
| } | |
| void loop () { | |
| while (resultNumber < MAX_RESULTS) { } | |
| for (int i = 0; i < MAX_RESULTS; i++) | |
| { | |
| Serial.println (results [i]); | |
| } | |
| resultNumber = 0; // reset counter | |
| ADCSRA = bit (ADEN) | bit (ADIE) | bit (ADIF)| bit (ADPS2) | bit (ADATE); // turn ADC ON | |
| } |
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