Mõõtmisperioodi muutmine, kursorid

scope.ino

@@ -2,13 +2,17 @@
 #define PIN_BUTTON_2 4
 #define PIN_BUTTON_3 3
 #define PIN_BUTTON_4 2
-#define PIN_ADC 0 // A0
+#define PIN_ADC 7 // A7
 
 #define BUTTON_1 0
 #define BUTTON_2 1
 #define BUTTON_3 2
 #define BUTTON_4 3
 
+// Cursor values
+#define CURSOR_1 "5.00"
+#define CURSOR_2 "0.00"
+
 // https://www.gammon.com.au/adc
 
 unsigned long G_LastDebounceTime[4];
@@ -34,33 +38,108 @@ byte ReadButton(int Button)
     return 0;
 }
 
+// Error occured, light the onboard LED and stop the program
+void Error()
+{
+    cli();
+    digitalWrite(LED_BUILTIN, HIGH);
+    for(;;) {}
+}
+
+// Set up the ADC registers
+void InitADC()
+{
+    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
+}
+
+#define PERIOD_10MS 0
+#define PERIOD_1MS 1
+#define PERIOD_100US 2
+#define PERIOD_10US 3
+#define PERIOD_100MS 4
+#define PERIOD_1S 5
 // Set timer 1 to a specified measuring interval
-void SetTimerPeriod()
+void SetTimerPeriod(int Period)
 {
     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)
+
+    // http://www.8bit-era.cz/arduino-timer-interrupts-calculator.html
+    switch(Period)
+    {
+        case PERIOD_1S:
+        {
+            TCCR1B = bit(CS12) | bit(WGM12);  // CTC mode, prescaler 256
+            OCR1A = 62499; // 1 Hz ((16 MHz / 256 * 1 Hz) - 1)
+        } break;
+        case PERIOD_100MS:
+        {
+            TCCR1B = bit(CS10) | bit(CS11) | bit(WGM12);  // CTC mode, prescaler 64
+            OCR1A = 24999; // 10 Hz ((16 MHz / 64 * 10 Hz) - 1)
+        } break;
+        case PERIOD_10MS:
+        {
+            TCCR1B = bit(CS11) | bit(WGM12);  // CTC mode, prescaler 8
+            OCR1A = 19999; // 100 Hz ((16 MHz / 8 * 100 Hz) - 1)
+        } break;
+        case PERIOD_1MS:
+        {
+            TCCR1B = bit(CS10) | bit(WGM12);  // CTC mode, prescaler 1
+            OCR1A = 15999; // 1000 Hz ((16 MHz / 1000 Hz) - 1)
+        } break;
+        case PERIOD_100US:
+        {
+            TCCR1B = bit(CS10) | bit(WGM12);  // CTC mode, prescaler 1
+            OCR1A = 1599; // 10000 Hz ((16 MHz / 10000 Hz) - 1)
+        } break;
+        case PERIOD_10US:
+        {
+            TCCR1B = bit(CS10) | bit(WGM12);  // CTC mode, prescaler 1
+            OCR1A = 159; // 100000 Hz ((16 MHz / 100000 Hz) - 1)
+        } break;
+        default:
+        {
+            Serial.print("SetTimerPeriod: Invalid period ");
+            Serial.println(Period);
+            Error();
+        } break;
+    }
+
     TIMSK1 |= bit(OCIE1B); // Enable CompareB interrupt
     sei();
 }
 
 volatile int results[100];
 volatile int resultNumber = 0;
+char G_PrintfBuf[32];
 
 // ADC complete ISR
 ISR(ADC_vect)
 {
-  if(resultNumber <= 99) results[resultNumber++] = ADC;
+    //int tstart = micros();
+
+    // Range is 0-4.8 V
+    // TODO the printing here needs to be faster
+    sprintf(G_PrintfBuf, "%s\t%s\t", CURSOR_1, CURSOR_2);
+    Serial.print(G_PrintfBuf);
+    Serial.println((ADC / 1023.0) * 4.8);
+    //Serial.println(5);
+
+    //sprintf(G_PrintfBuf, "%d\n", micros() - tstart);
+    //Serial.println(G_PrintfBuf);
 } 
 
 EMPTY_INTERRUPT (TIMER1_COMPB_vect);
 
-char G_PrintFBuf[32];
 void setup() 
 {
+    pinMode(LED_BUILTIN, OUTPUT);
     pinMode(PIN_BUTTON_1, INPUT_PULLUP);
     pinMode(PIN_BUTTON_2, INPUT_PULLUP);
     pinMode(PIN_BUTTON_3, INPUT_PULLUP);
@@ -68,13 +147,8 @@ void setup()
 
     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
+    SetTimerPeriod(PERIOD_100US);
+    InitADC();
 
     for(int i = 0; i < 4; i++) G_LastDebounceTime[i] = 0;
     for(int i = 0; i < 4; i++) G_PrevButtonState[i] = HIGH;
@@ -87,15 +161,8 @@ void loop()
         byte State = ReadButton(i);
         if(State == 1)
         {
-            sprintf(G_PrintFBuf, "Button %d is %d\n", i, State);
-            Serial.println(G_PrintFBuf);
+            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;
-    }
 }
-