CosmicPiAnalogueSoftwareTrigger

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+//plug the Cosmic Pi Analogue PCB in to the arduino directly, make sure you've disconnected the VBias pin and powered the SiPM's
+//via an alternative power supply
+
+//This code reads A1 and A3 in free running mode. If the values are higher than threshold, it outputs the cumulative number of events
+//and the time since the last event in milliseconds. 
+
+//the commented out part at the bottom can be used to output the actual data and is what we've been using to make some plots.
+//this whole thing runs in a loop and is a long way from true realtime. 
+
+//J. Devine 29/08/16
+
+uint16_t bufa[5000];   // 4 buffers of 256 readings
+uint16_t bufb[5000];   // 4 buffers of 256 readings
+bool firstrun = 0;
+int t;
+int evt; //event
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Alive");
+  int t = analogRead(0);
+ //int evt; //events
+
+  ADC->ADC_MR |= 0x80; // these lines set free running mode on adc 4 and adc 6 (pin A1 and A3 - see Due Pinout Diagram thread)
+  ADC->ADC_CR = 2;
+  ADC->ADC_CHER = 0x50; // this is (1<<7) | (1<<6) for adc 3 and adc 6
+  evt=0;
+}
+
+void loop() {
+  int q0 = 0, q1 = 0;
+  int a1, a3;
+  for (int i = 0; i < 5000; i++) {
+    while ((ADC->ADC_ISR & 0x50) != 0x50); // wait for two conversions (pin A3[4]  and A1[6])
+    a1 = ADC->ADC_CDR[4];            // read data on A3 pin
+    a3 = ADC->ADC_CDR[6];            // read data on A1 pin
+    bufa[i] = a1;
+    bufb[i] = a3;
+    if (bufb[i] > 920) { //software trigger
+    if (bufa[i] > 920) { //software trigger
+      t=millis()-t;
+      Serial.print(t);Serial.print(" Trigger "); Serial.println(evt);
+      evt++;
+      t=millis();
+    }
+    }
+    //q0+=a1;
+    //q1+=a3;
+  }
+  //t = micros() - t;
+  //Serial.print("5000 pairs of conversions in ");Serial.print(t);Serial.println(" micros");
+  //Serial.print("A0 total:");Serial.println(q0);
+  //Serial.print("A1 total:");Serial.println(q1);
+  //Serial.print("A0:");Serial.println("A1:");
+  /*if (firstrun) {
+    for (int i = 0; i < 5000; i++) {
+      if (bufb[i] > 920) { //software trigger
+        if (bufa[i] > 920) { //software trigger
+          //evt++;
+          Serial.print(evt);Serial.print(" Time since last trigger ");Serial.print(t);Serial.println(" micros");
+          //for (int j = i - 10; j < i + 40; j++) {
+          //  Serial.print(j); Serial.print("; "); Serial.print(bufa[j]); Serial.print("; "); Serial.print(bufb[j]); Serial.println(";");
+          //}
+
+        }
+      }
+    }
+  t=micros();
+  }
+  firstrun = 1;
+*/
+}
+
+