Esimene commit

scope.ino

+#define PIN_BUTTON_1 5
+#define PIN_BUTTON_2 4
+#define PIN_BUTTON_3 3
+#define PIN_BUTTON_4 2
+#define PIN_ADC 0 // A0
+
+#define BUTTON_1 0
+#define BUTTON_2 1
+#define BUTTON_3 2
+#define BUTTON_4 3
+
+// https://www.gammon.com.au/adc
+
+unsigned long G_LastDebounceTime[4];
+int G_ButtonState[4];
+int G_PrevButtonState[4];
+#define DEBOUNCE_DELAY_MS 25
+byte ReadButton(int Button)  
+{
+    const int ButtonPins[4] = { PIN_BUTTON_1, PIN_BUTTON_2, PIN_BUTTON_3, PIN_BUTTON_4 };
+    int State = digitalRead(ButtonPins[Button]);
+
+    if(State != G_PrevButtonState[Button]) G_LastDebounceTime[Button] = millis(); 
+
+    if((millis() - G_LastDebounceTime[Button]) > DEBOUNCE_DELAY_MS)  
+    { 
+        if(State != G_ButtonState[Button])  
+        { 
+            G_ButtonState[Button] = State; 
+            if(G_ButtonState[Button] == LOW) return 1;
+        }
+    }
+    G_PrevButtonState[Button] = State;
+    return 0;
+}
+
+// Set timer 1 to a specified measuring interval
+void SetTimerPeriod()
+{
+    cli();
+    TCCR1A = 0;
+    TCCR1B = 0; // Reset TCCR
+    TCNT0 = 0; // Reset the counter
+    TCCR1B = bit(CS11) | bit(WGM12);  // CTC mode, prescaler 8
+    OCR1A = 19999; // 100 Hz ((16 MHz / 8 * 100 Hz) - 1)
+    TIMSK1 |= bit(OCIE1B); // Enable CompareB interrupt
+    sei();
+}
+
+volatile int results[100];
+volatile int resultNumber = 0;
+
+// ADC complete ISR
+ISR(ADC_vect)
+{
+  if(resultNumber <= 99) results[resultNumber++] = ADC;
+} 
+
+EMPTY_INTERRUPT (TIMER1_COMPB_vect);
+
+char G_PrintFBuf[32];
+void setup() 
+{
+    pinMode(PIN_BUTTON_1, INPUT_PULLUP);
+    pinMode(PIN_BUTTON_2, INPUT_PULLUP);
+    pinMode(PIN_BUTTON_3, INPUT_PULLUP);
+    pinMode(PIN_BUTTON_4, INPUT_PULLUP);
+
+    Serial.begin(2000000);
+
+    SetTimerPeriod(); // Set timer to 100 Hz
+
+    ADCSRA = bit(ADEN) | bit(ADIE) | bit(ADIF); // Enable the ADC and the read complete interrupt
+    ADCSRA |= bit(ADPS2); // Prescaler 16
+    ADMUX = bit(REFS0) | PIN_ADC;
+    ADCSRB = bit(ADTS0) | bit(ADTS2); // Timer 1 CompareB
+    ADCSRA |= bit(ADATE);  // Enable auto trigger
+
+    for(int i = 0; i < 4; i++) G_LastDebounceTime[i] = 0;
+    for(int i = 0; i < 4; i++) G_PrevButtonState[i] = HIGH;
+}
+
+void loop()
+{
+    for(int i = 0; i < 4; i++)
+    {
+        byte State = ReadButton(i);
+        if(State == 1)
+        {
+            sprintf(G_PrintFBuf, "Button %d is %d\n", i, State);
+            Serial.println(G_PrintFBuf);
+        }
+    }
+
+    if(resultNumber == 100)
+    {
+        for(int i = 0; i < 100; i++) Serial.println(results[i]);
+        resultNumber = 0;
+    }
+}
+