Interrupt function on Cosmic Pi 1.6 using STM32 for Arduino

CosmicPi16Interrupt.ino

//drive the dac channels
//set values into eeprom
#include <EEPROM.h>


//ref point for HV is 0xAD
//eeprom writing table
/*
 *EEPROM Status - byte 00
 *channel 0 high byte - 01
 *channel 0 low byte  - 02 
 *channel 1 high byte - 03
 *channel 1 low byte  - 04
 *HV bias ch 0 value  - 05
 *HV bias ch 1 value  - 06
 */
 
/*
  Blink

  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Blink
*/
int Status = 0;
int Data = 0;
// the setup function runs once when you press reset or power the board
byte smallpart;
byte bigpart;
int x = 0; //cosmic counter
int hvsweep = 0xFE;
#include <Wire.h>
  int HVVal = 0xFE;





  byte setHV(byte _send)  // This function is what bitbangs the data
{
  if (_send > 0x6F){
    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
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);
  attachInterrupt(digitalPinToInterrupt(PB10), eventdetect, RISING);


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

  digitalWrite(PC8, LOW);
  setHV(0xAC);
  digitalWrite(PC8, HIGH);
 

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


//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.println(" write to eeprom ");
// the loop function runs over and over again forever
}

void loop() {

/*  //debounce loop
  if (digitalRead(PB10) == 0) {
    Serial.println("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);
    }
  }
  */

  Serial.println("0");


}

void eventdetect()
{
  
    Serial.println(x);
    x++;
}

// set the two HV supplies