> ## Documentation Index
> Fetch the complete documentation index at: https://notevil.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# CAPLfunctionARE2ECalculateCRC

# ARE2ECalculateCRC

[Valid for](../../../Shared/FeatureAvailability.md): CANoe DE • CANoe4SW DE

## Function Syntax

```
long ARE2ECalculateCRC (PDU * aPDU, char sigGroupName[], qword & crc, long & crcSizeInBit);
```

## Description

Calculates the corresponding checksum and the CRC size (in bits) from a PDU. It is necessary that the PDU has a valid E2E.

## Parameters

* **aPDU**: A referenced PDU object.
* **sigGroupName**: The name of the signal group or empty. If empty, then the E2E should be directly defined at the PDU instead of the signal group.
* **crc**: The calculated CRC value.
* **crcSizeInBit**: The size of the CRC in bit (8, 16, 32, 64 bit).

## Return Values

* **0**: Successful
* **-1**: Not successful: PDU not found in database
* **-2**: Not successful: There is no signal group with the defined Name in the PDU or there is no E2E protection information defined for the signal group/PDU
* **-3**: Not successful: The CRC value could not be calculated

## Example

```plaintext theme={null}
on PDU <PDU_NAME>
{
  qword crc;
  long crcSizeInBit;
  ARE2ECalculateCRC (this, "", crc, crcSizeInBit);
}
```