SPRADP4 February   2025 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM62A3 , AM62A3-Q1 , AM62A7 , AM62A7-Q1 , AM62P , AM62P-Q1 , AM67 , AM68A , AM69A , DRA821U , TDA4AEN-Q1 , TDA4AH-Q1 , TDA4AL-Q1 , TDA4AP-Q1 , TDA4VE-Q1 , TDA4VEN-Q1 , TDA4VH-Q1 , TDA4VL-Q1 , TDA4VM , TDA4VM-Q1 , TDA4VP-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2MCAN Features
  6. 3MCAN Software Configuration
    1. 3.1 Filter Configuration
    2. 3.2 Transmitter Delay Compensation
    3. 3.3 MCAN Bit Timing Parameters
  7. 4Debug Tips to Resolve MCAN Communication Issues
    1. 4.1 Debugging the MCAN Hardware
    2. 4.2 Debugging using MCAN registers
      1. 4.2.1 MCAN Protocol Status Register
      2. 4.2.2 MCAN Error Counter Register
    3. 4.3 Understanding MCAN applications in TI SDKs
      1. 4.3.1 MCU PLUS SDK
      2. 4.3.2 Linux SDK
      3. 4.3.3 MCAL SDK
      4. 4.3.4 PDK
    4. 4.4 Other Common Issues
  8. 5Related FAQs
  9. 6Summary
  10. 7References

3.1 Filter Configuration

The MCAN module is capable to configure two types of acceptance filters - one for standard(11-bit ID) and one for extended identifiers(29-bit ID).

Acceptance filtering starts when complete Message ID is received. Acceptance filtering stops at the first matching enabled filter element or when the end of the filter list is reached. If a filter element matches, then the Rx Handler starts writing the received message data in portions of 32 bit to the matching Rx Buffer or Rx FIFO. If an error condition occurs (for example, CRC error), then this message is rejected. To receive message for a particular CAN ID: if the receptor CAN node is not configured for the same ID, then data gets rejected.

Configuration registers to check for filter elements are:

  • Global Filter Configuration (MCAN_GFC) register

  • Standard ID Filter Configuration (MCAN_SIDFC) register

  • Extended ID Filter Configuration (MCAN_XIDFC) register

  • Extended ID AND Mask (MCAN_XIDAM) register