yamt commented on PR #13498:
URL: https://github.com/apache/nuttx/pull/13498#issuecomment-2451268714

   > Those are both loopback tests.
   > 
   > Here's the output on ESP32C3 when using TWAI defconfig with loopback 
enabled.
   > 
   > Configuration used:
   > 
   >     * `./tools/configure.sh -l esp32c3-generic:twai`
   > 
   >     * Set:
   >       CONFIG_DEBUG_ASSERTIONS=y
   >       CONFIG_DEBUG_ASSERTIONS_EXPRESSION=y
   >       CONFIG_DEBUG_FEATURES=y
   >       CONFIG_CAN_LOOPBACK=y
   >       CONFIG_ESPRESSIF_TWAI_TEST_MODE=y
   >       CONFIG_ESPRESSIF_TWAI0_TXPIN=8
   >       CONFIG_ESPRESSIF_TWAI0_RXPIN=8
   > 
   >     * make and flash
   > 
   > 
   > # Expected output
   > 
   > Hash: 
[e3d7d23](https://github.com/apache/nuttx/commit/e3d7d236189517129b66557342ed1273c84f8ab8)
   > 
   > ```
   > nsh> can -n 5 -b 5
   > nmsgs: 5
   > min ID: 1 max ID: 5
   > Bit timing:
   >    Baud: 1818181
   >   TSEG1: 16
   >   TSEG2: 5
   >     SJW: 4
   >   ID:    1 DLC: 1
   >   ID:    1 DLC: 1
   >   ID:    1 DLC: 1 -- OK
   >   ID:    2 DLC: 2
   >   ID:    2 DLC: 2
   >   ID:    2 DLC: 2 -- OK
   >   ID:    3 DLC: 3
   >   ID:    3 DLC: 3
   >   ID:    3 DLC: 3 -- OK
   >   ID:    4 DLC: 4
   >   ID:    4 DLC: 4
   >   ID:    4 DLC: 4 -- OK
   >   ID:    5 DLC: 5
   >   ID:    5 DLC: 5
   >   ID:    5 DLC: 5 -- OK
   > Terminating!
   > ```
   > 
   > # Current output
   > 
   > Hash: 
[761ee81](https://github.com/apache/nuttx/commit/761ee819568a52f1934ccf17bae20fe9816ebdec)
 (this PR)
   > 
   > ```
   > nsh> can -n 5 -b 5
   > nmsgs: 5
   > min ID: 1 max ID: 5
   > Bit timing:
   >    Baud: 1818181
   >   TSEG1: 16
   >   TSEG2: 5
   >     SJW: 4
   >   ID:    1 DLC: 1
   > ```
   > 
   > Stops responding at this point
   
   thank you.
   i now have an idea about the cause. i will submit a fix later.


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