From a6efc54ae26dae53e1daf3a43c2ff25ca7a76a70 Mon Sep 17 00:00:00 2001
From: James Devine <devine.jd@gmail.com>
Date: Thu, 28 Sep 2017 15:29:23 +0200
Subject: [PATCH]

---
 I2CTestRoutine | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 I2CTestRoutine

diff --git a/I2CTestRoutine b/I2CTestRoutine
new file mode 100644
index 0000000..830950a
--- /dev/null
+++ b/I2CTestRoutine
@@ -0,0 +1,76 @@
+#include <Wire.h>
+
+//this code sets values in the MAX5387LAUD+ via I2C.
+//it then reads back those values over A1 and A2 inputs
+//The ADC is set to 12 bits for the DUE
+//Channels are scanned in parallel (0 to 255)
+//then alternatively ascending and descending.
+//Output is a CSV over serial at 9600bps.
+
+//this test works when testing with board 2
+//Note the MAX5387LAUD+ doesn't support I2C readback.
+
+
+byte ADCval;
+byte ADCval1;
+byte ADCval2;
+byte ADCval3;
+byte ADCval4;
+byte ADCval5;
+byte ADCval6;
+
+void setup() {
+  // put your setup code here, to run once:
+  pinMode(35, OUTPUT); //setup for the MAX5387 - later set to 0. signal PA0
+  pinMode(36, OUTPUT);//setup for the MAX5387 - later set to 0. signal PA1
+  pinMode(37, OUTPUT);//setup for the MAX5387 - later set to 0. signal PA2
+  pinMode(A1, INPUT); //make sure the input pins are in high impedance mode
+  pinMode(A2, INPUT);//make sure the input pins are in high impedance mode
+  pinMode(11, OUTPUT);//flash the LED
+  digitalWrite(35, LOW);//configure the address of the MAX5387 pot
+  digitalWrite(36, LOW);//configure the address of the MAX5387 pot
+  digitalWrite(37, LOW);//configure the address of the MAX5387 pot
+  pinMode(5, INPUT); //set the interrupt pin for trigger as high impedance, probably not required
+  
+  //setup the serial for debug
+  Serial.begin(9600);
+  //setup the MAX5387 pot
+  ADCval1 = byte(88); // <- start point for the loop
+  analogReadResolution(12); 
+
+  
+attachInterrupt(digitalPinToInterrupt(5), toggleLED, RISING);
+
+  
+}
+
+
+void loop() {
+  Wire.begin();
+  //Serial.print("MAX5387 Address ");
+  //Serial.print(0x28, HEX);
+  Wire.beginTransmission(byte(0x28)); // transmit to device #112
+  Wire.write(byte(B00010011)); //sets the same value to both channels, if you want to tune each see max5387 datasheet
+  Wire.write(ADCval1);// sets register pointer to echo #1 register (0x02)
+  Wire.endTransmission();      // stop transmitting
+  Serial.print("Both Channels ++ Setpoint 1:"); //note that this is manually updated by the human!
+  Serial.print(ADCval1); //note that this is manually updated by the human!
+  Serial.print("; Setpoint 2:"); //note that this is manually updated by the human!
+  Serial.print(ADCval1); //note that this is manually updated by the human!
+  Serial.print("; A1:"); 
+  Serial.print(analogRead(A1));
+  Serial.print("; A2:"); 
+  Serial.print(analogRead(A2));
+  Serial.println(";"); 
+  delay(10000); //how long to wait before trying the new value
+ADCval1++; //incrememnt the channel value
+
+//digitalWrite(11, LOW); //reset the LED to low; interrupt sets it high
+
+
+}
+
+void toggleLED(){
+digitalWrite(11, HIGH); //makes the LED on the board flash
+digitalWrite(11, LOW); //reset the LED to low; interrupt sets it high
+}