commit 0a3b5543e9e79ed74e5580d6acb83abfa9c28803
Author: James Devine <devine.jd@gmail.com>
Date:   Mon Jul 30 22:52:02 2018 +0200

diff --git a/CosmicPiV2I2CSPItest.ino b/CosmicPiV2I2CSPItest.ino
new file mode 100644
index 0000000..0aeb094
--- /dev/null
+++ b/CosmicPiV2I2CSPItest.ino
@@ -0,0 +1,176 @@
+#include <SPI.h>
+#include <Wire.h>
+
+/* Cosmic Pi SPI test routines - Master version, slave is commented out below. Runs on an Arduino DUE,
+    Pinouts:
+    MOSI - MOSI
+    MISO - MISO
+    SCK - SCK
+    Pin 10 - Pin 10 (SS)
+    GND - GND
+    5V - 5V
+
+    The slave echoes the master byte in the next (16 bit) transmission.
+
+
+
+
+  SPI COMMUNICATION TRANSACTION LIST OF COMMANDS
+
+  WRITE OPERATIONS (FOR EACH WRITE, SLAVE MUST SEND BACK THE VALUE IT RECEIVES)
+
+  01  WRITE MSB(16 high bits) HV1_DUTY_CYCLE
+  02  WRITE LSB(16 low bits) HV1_DUTY_CYCLE
+  03  WRITE MSB(16 high bits) HV2_DUTY_CYCLE
+  04  WRITE LSB(16 low bits) HV2_DUTY_CYCLE
+  05  WRITE 16 bits LED_DUTY_CYCLE
+
+  READ OPERATIONS (FOR EACH READ, SLAVE MUST SEND BACK THE VALUE OF THE RELATED REGISTER)
+
+  06  READ MSB(16 high bits) HV1_DUTY_CYCLE
+  07  READ LSB(16 low bits) HV1_DUTY_CYCLE
+  08  READ MSB(16 high bits) HV2_DUTY_CYCLE
+  09  READ LSB(16 low bits) HV2_DUTY_CYCLE
+  10  READ 16 bits LED_DUTY_CYCLE
+
+  11  WRITE STATUS
+  12  READ STATUS
+
+
+*/
+
+byte CMD = 1;
+
+unsigned int duty_cycle_LED = 81;
+unsigned int duty_cycle_channel_A = 100000;
+unsigned int duty_cycle_channel_B = 200000;
+unsigned int MSB;
+unsigned int LSB;
+byte val = 0;
+
+//unsigned int response = 0;
+unsigned int answer = 0;
+byte PSU_parametrized = 0;
+
+#define MCP4725_ADD0 0x60
+#define MCP4725_ADD1 0x61
+
+int thresh1 = 255;//12 bit
+int thresh2 = 255;//12 bit integer
+//int threshhigh = 0;
+
+
+//setpoints for the HV
+int HVset1 = 56;
+int HVset2 = 56;
+
+void setup() {
+  //setup i2c and init dac's at a reasonable value
+  Wire.begin(); // join i2c bus (address optional for master)
+  DacUpd(MCP4725_ADD0, thresh1);
+  DacUpd(MCP4725_ADD1, thresh2);
+
+  //setup spi
+  pinMode(SS, OUTPUT);
+  SPI.begin();
+  SPI.setBitOrder(MSBFIRST);
+  //SPI.setClockDivider(SPI_CLOCK_DIV128 );
+
+  //begin serial
+  Serial.begin(9600);
+
+
+}
+
+void loop() {
+
+  Serial.println("Input a command!");
+  Serial.println("[1= set thrshold1; 2= set threshold2, 3= set HV ch1, 4 = set HV ch2, 5 = set HV enables]");
+  int cmd = readIntFromSerial();
+  switch (cmd) {
+    case 1:
+      {
+        Serial.println("Set a threshold value Ch1[1,4096]: ");
+        int value = readIntFromSerial();
+        //setThreshold(3, value);
+        DacUpd(MCP4725_ADD0, value);
+        break;
+      }
+    case 2:
+      {
+        Serial.println("Set a threshold value Ch2[1,4096]: ");
+        int value = readIntFromSerial();
+        //setThreshold(3, value);
+        DacUpd(MCP4725_ADD1, value);
+        break;
+      }
+    case 3:
+      {
+        Serial.println("Input a voltage value Ch1[1=highest,255=lowest,56=nominal]");
+        int sendValue = readIntFromSerial();
+        //if (sendValue < HV_MAX_VAL) {
+        //  Serial.print("HV Value is too high! Setting HV ch2 to:");
+        //  Serial.println(HV_MAX_VAL);
+        //send the command code
+        spi_exchange(2);
+        spi_exchange(sendValue);
+        break;
+       }
+    case 4:
+      {
+        Serial.println("Input a voltage value Ch2[1=highest,255=lowest,56=nominal]");
+        int sendValue = readIntFromSerial();
+        //if (sendValue < HV_MAX_VAL) {
+        //  Serial.print("HV Value is too high! Setting HV ch2 to:");
+        //  Serial.println(HV_MAX_VAL);
+        //send the command code
+        spi_exchange(4);
+        spi_exchange(sendValue);
+        break;
+       }
+    case 5:
+      {
+        Serial.println("enabling HV");
+        spi_exchange(11);
+        spi_exchange(3);
+        break;
+       }
+  }
+
+  delay(500);
+
+
+}
+
+int spi_exchange(int data) {
+  digitalWrite(SS, LOW);
+  int response = SPI.transfer16(data);
+  Serial.println("SPI Master send command:" + String(data) + " Slave reply:" + String(response));
+  digitalWrite(SS, HIGH);
+  delay(20);
+  return response;
+}
+
+
+
+int readIntFromSerial(){
+  int val = Serial.parseInt();
+  while (val == 0){
+    delay(100);
+    val = Serial.parseInt();
+  }
+  return val;
+}
+
+
+void DacUpd(int address, int packet1)
+{
+  Wire.beginTransmission(address);
+  Wire.write(64);                     // cmd to update the DAC
+  Wire.write(packet1 >> 4);        // the 8 most significant bits...
+  Wire.write((packet1 & 15) << 4); // the 4 least significant bits...
+  Wire.endTransmission();
+  Serial.println("I2C send command:" + String(address) + " data:" + String(packet1));
+  
+
+}
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