yangsong8-a1 opened a new pull request, #17467:
URL: https://github.com/apache/nuttx/pull/17467

   ## Summary
   
   1. The judgment of present is accurate to a specific bit.
   2. Fixed some issues when serial rxbuf and txbuf were disabled.
   3. replace critical_section with spinlock
   
   ## Impact
   
   replace critical_section with spinlock. 
   fix some issue when enable CONFIG_CDCACM_DISABLE_RXBUF and 
CONFIG_CDCACM_DISABLE_TXBUF
   
   ## Testing
   
   local arm cortex board to test end and receive functions, plugout, stress 
test and so on.
   sim: Verify send and receive functions: 
   ```
   nsh> conn 1
   conn_main: Performing architecture-specific initialization
   conn_main: Exiting
   nsh> cat /dev/ttyACM0 &
   sh [8:100]
   Ash> AT
   nsh> 
   nsh> 123
   nsh> echo hello > /dev/ttyACM0
   nsh> poweroff
   ```
   


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