CAN - Shield Serial Monitor

[loovee]

@giliepin

There’s something that i dont understand. Why when I add the function of printing the error on the monitor I dont get any interrupts?
This is very strange to me

[code]void setup()
{
CAN.begin(CAN_500KBPS); // init can bus : baudrate = 500k
attachInterrupt(0, MCP2515_ISR, FALLING); // start interrupt
Serial.begin(115200);
}

void MCP2515_ISR()
{
Flag_Recv = 1;
}

void loop()
{

if(Flag_Recv)                   // check if get data
{
  Flag_Recv = 0;                // clear flag
  CAN.readMsgBuf(&len, buf);    // read data,  len: data length, buf: data buf
  Serial.println("CAN_BUS GET DATA!");
  Serial.print("data len = ");Serial.println(len);
  for(int i = 0; i<len; i++)    // print the data
  {
    Serial.print(buf[i]);Serial.print("\t");
  }
  Serial.println();
  Serial.print ("RPM:  ");Serial.print(RPMreading(buf[0],buf[1]));Serial.print("\t");//print the decimal value of the RPM
  Serial.print ("GEAR: ");Serial.print(buf[3]);Serial.print("\t");                   //print the decimal value of the GEAR
  Serial.print ("BATT: ");Serial.print(BATTreading(buf[4],buf[5]));Serial.print("\t");//print the decimal value of the BATTERY
  Serial.print ("ET: ");Serial.print(ETreading(buf[6],buf[7]));Serial.print("\t");//print the decimal value of the ENGINE TEMP
  Serial.println();
 
 }

    
  Serial.print ("value of error register: ");
  Serial.println (CAN.checkError()); 

}[/code]

try this :

unsigned char err = CAN.checkError();
if(err!= CAN_OK)
{
Serial.print ("value of error register: ");
Serial.println (err); 
}