SLAAET4 April   2025 MSPM0G3506 , MSPM0G3507 , MSPM0G3518 , MSPM0G3519

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 MCAN Features
  5. 2Sysconfig Configuration for MCAN Module
    1. 2.1 MCAN Clock Frequency
    2. 2.2 MCAN Basic Configuration
      1. 2.2.1 Transmitter Delay Compensation (TDC)
      2. 2.2.2 Bit Timing Parameters
      3. 2.2.3 Message RAM Configuration
        1. 2.2.3.1 Standard and Extended ID Filter Configuration
          1. 2.2.3.1.1 How to Add More Filters
        2. 2.2.3.2 TX MSG RAM
        3. 2.2.3.3 RX MSG RAM
    3. 2.3 Advanced Configuration
    4. 2.4 Retention Configuration
    5. 2.5 Interrupts
    6. 2.6 Pin Configuration and PinMux
  6. 3Demo Project Descriptions
    1. 3.1 TX Buffer Mode
    2. 3.2 TX FIFO Mode
    3. 3.3 RX Buffer Mode
    4. 3.4 RX FIFO Mode
  7. 4Debug and Design Tips to Resolve/Avoid CAN Communication Issues
    1. 4.1 Minimum Number of Nodes Required
    2. 4.2 Why a Transceiver is Needed
    3. 4.3 Bus Off Status
    4. 4.4 Using MCAN in Low Power Mode
    5. 4.5 Debug Checklist
      1. 4.5.1 Programming Issues
      2. 4.5.2 Physical Layer Issues
      3. 4.5.3 Hardware Debug Tips
  8. 5Summary
  9. 6References

4.5.3 Hardware Debug Tips

  • To see the waveform until the ACK phase, a transceiver must be connected to the node. Without a transceiver, the node immediately goes into an error state.
  • Check if the CAN frame is correctly seen at the MCAN_TX pin of the transmitting MCU and is of the expected bit-rate. If the expected data is seen at the MCAN_TX pin, then check the data at the MCAN_RX pin. If the same data is seen at the MCAN_RX pin, then the transceiver is correctly looping back the data.
  • If using an oscilloscope with a built-in CAN FD trigger, then make sure that the signal configured for triggering matches the signal being probed on the board. Many oscilloscopes are capable of triggering on CAN-transmit (CANTX), CAN-receive (CANRX), CAN_H and CAN_L signals, in addition to Start-of_Frame (SOF), Remote frames, Error frames and specific Message IDs.
  • If the scope does not decode the waveform, then make sure input threshold value for the channel is correct. This is similar to the trigger level that is normally used for signals.
  • Make sure the bit-rate for both nominal and data phases are correctly configured in the oscilloscope. Otherwise, this shows incorrect data.
  • CAN bus analyzer tool: make sure the bit-rate for both nominal and data phases are correctly configured.