commit cc402ce4fa95ebd58b1c6ba47f75185fb993b7e2
Author: James Devine <devine.jd@gmail.com>
Date:   Sun Oct 16 16:53:18 2016 +0200

diff --git a/Cosmic Pi Trigger Threshold test b/Cosmic Pi Trigger Threshold test
new file mode 100644
index 0000000..d657032
--- /dev/null
+++ b/Cosmic Pi Trigger Threshold test	
@@ -0,0 +1,63 @@
+#include <Wire.h>
+
+//this test works when testing with boards 1 and 2
+//set the threshold as a 1 time value, max is 3.3V (voltage reference removed from protos)
+//crashes due to 50Hz noise
+//input thresholds not checked 100%
+//minimum input signal duration 40ns for coincidence.
+//at 40ns incident coincidence the output lasts for 150ns - plenty for the DUE to capture.
+//Hardware is more reliable than DUE's noise immunity.
+//Note the MAX5387LAUD+ doesn't support I2C readback.
+
+void setup() {
+  // put your setup code here, to run once:
+  pinMode(48, OUTPUT);
+  pinMode(49, OUTPUT);
+  pinMode(35, OUTPUT);
+  pinMode(36, OUTPUT);
+  pinMode(37, OUTPUT);
+  pinMode(A1, INPUT);
+  pinMode(A2, INPUT);
+  digitalWrite(35, LOW);
+  digitalWrite(36, LOW);
+  digitalWrite(37, LOW);
+  //pinMode(38, INPUT);
+  //pinMode(39, INPUT);
+  pinMode(5, INPUT);
+  attachInterrupt(38, striga, RISING);
+  attachInterrupt(39, strigb, RISING);  
+  attachInterrupt(5, realint, RISING);
+   Wire.begin();
+   Serial.begin(9600);
+  Serial.print("Address ");
+  Serial.print(0x28, HEX);
+  Wire.beginTransmission(byte(0x28)); // transmit to device #112
+  Wire.write(byte(B00010011));
+  Wire.write(byte(0x50));// sets register pointer to echo #1 register (0x02)
+  Wire.endTransmission();      // stop transmitting
+  Serial.println("threshold set to 0x80");
+  //digitalWrite(48, HIGH);
+  //digitalWrite(49, HIGH);
+}
+
+void striga(){
+Serial.print("a");
+}
+void strigb(){
+Serial.println("b");
+}
+void realint(){
+Serial.println("real");
+}
+void loop() {
+  // put your main code here, to run repeatedly:
+  //delay(100);
+
+//digitalWrite(48, HIGH);
+//digitalWrite(49, HIGH);
+
+
+//digitalWrite(48, LOW);
+//digitalWrite(49, LOW);
+//delay(1000);
+}
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