//drive the dac channels

/*
  Crude code to get the Cosmic Pi up and running, spits out events (coincidence on both channels, after setting the HV to about 28V
  and the DAC to 22F (whatever that is).
  Makes the light blink (it's not very bright) and prints the event number.
  Rate on the test unit seems reasonable, we'll test this against a proper setup over the next few weeks
  To be re-written using interrupts for production code.
  */

// the setup function runs once when you press reset or power the board
byte smallpart;
byte bigpart;
int x = 0; //cosmic counter

#include <Wire.h>
  int HVVal = 0xFE;
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(PA6, OUTPUT);
 pinMode(PA4, OUTPUT); 
 pinMode(PA5, OUTPUT);
  Serial.begin(9600);

//config SPI pins
  pinMode(PC7, OUTPUT);
  pinMode(PC8, OUTPUT);
  pinMode(PC3, OUTPUT);    
  pinMode(PB13, OUTPUT);

    //set input pins
  pinMode(PC12, INPUT);
  pinMode(PC11, INPUT);
  pinMode(PB10, INPUT);


  
  digitalWrite(PC7, LOW);
  setHV(0xAD);
  digitalWrite(PC7, HIGH);

  digitalWrite(PC8, LOW);
  setHV(0xAD);
  digitalWrite(PC8, HIGH);
  HVVal= HVVal+10; 

  Wire.setSDA(PB7);
  Wire.setSCL(PB8);
  Wire.begin();
smallpart = 0x2F; //the lsb part
bigpart = 0x02; // the msb part of the dac value

  Serial.write("Hello ");
//  Serial.write(HVVal);

  //digitalWrite(PA5, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(PA5, LOW);    // turn the LED off by making the voltage LOW
  //delay(10000);   

int address = 0x60;


  Wire.beginTransmission(address);
   Wire.write(B00001000);              // sends five bytes
  Wire.write(bigpart);                    // sends one byte
  Wire.write(smallpart);
  Wire.endTransmission();

  Wire.beginTransmission(address);
   Wire.write(B00000000);              // sends five bytes
  Wire.write(bigpart);                    // sends one byte
  Wire.write(smallpart);
  Wire.endTransmission();


  Serial.write("transmitted ");

  Serial.write(" looping ");

}

// the loop function runs over and over again forever

void loop() {


  //debounce loop
  if (digitalRead(PB10) == 0) {
    //Serial.write("0");
  if (digitalRead(PB10) == 1) {
    //low to high print x
    //Serial.write("x");
    Serial.println(x);
    x++;
    digitalWrite(PA5, HIGH);
    delay(200);
    digitalWrite(PA5, LOW);
    }
  }

  /*if PC11 == LOW {
    Serial.write("1");
    
  if PC11 == HIGH {
    //low to high print x
    Serial.write("y");
    }
  }
  */
//smallpart--;
}

// set the two HV supplies
byte setHV(byte _send)  // This function is what bitbangs the data
{
    for(int i=0; i<8; i++)  // There are 8 bits in a byte
    {
      digitalWrite(PC3, bitRead(_send, 7-i));    // Set MOSI
      //delay(1);
      digitalWrite(PB13, HIGH);                  // SCK high
      //bitWrite(_receive, i, digitalRead(MISO_pin)); // Capture MISO
      digitalWrite(PB13, LOW);                   // SCK low
    //digitalWrite(MOSI_pin, LOW);    // Set MOSI
      
    }
     //digitalWrite(SS_pin[j], HIGH);       // SS high again 
  }
  //return _receive;        // Return the received data