Converting CAN-Bus (HEX) values to binary to sort out interessting Bits

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3

Thanks Pylon, I will try this out right now :slight_smile:

EDIT:
I tried but guess I don't understand the syntax of this.
Here is my Code (from MCU_CAN.h library)

void loop()
{
  if(!digitalRead(CAN0_INT))                         // If CAN0_INT pin is low, read receive buffer
  {
    CAN0.readMsgBuf(&rxId, &len, rxBuf);      // Read data: len = data length, buf = data byte(s)
    
    if((rxId & 0x80000000) == 0x80000000)     // Determine if ID is standard (11 bits) or extended (29 bits)
      sprintf(msgString, "Extended ID: 0x%.8lX  DLC: %1d  Data:", (rxId & 0x1FFFFFFF), len);
    else
      sprintf(msgString, "Standard ID: 0x%.3lX       DLC: %1d  Data:", rxId, len);
  
    Serial.print(msgString);
  
    if((rxId & 0x40000000) == 0x40000000){    // Determine if message is a remote request frame.
      sprintf(msgString, " REMOTE REQUEST FRAME");
      Serial.print(msgString);
    } else {
      for(byte i = 0; i<len; i++){
        sprintf(msgString, " 0x%.2X", rxBuf[i]);
        Serial.print(msgString);
     
      }
    }
        
    Serial.println();
  }
}

Although "msgString" is declared as a char array of length 128 the example does not use any index to write to it. That's alone something I don't understand :frowning:

Basically, if I understand this of your post

Or extract the subvalue of variable "value" at startbit 12, length 8 bit:

Code: [Select]

uint32_t detail = (value >> 12) & 0xFF;

I don't see any need for arrays or the like, the processor is able to handle the bit values.

I would be happy. Could you just throw it in my code, I will try to understand from there!