usb库更新

Review Request #2524 — Created May 14, 2021 and submitted

Information
taoqiwen
Yc3121
Reviewers
dengzhiqian, wushengyan 
1、优化usb中断处理中得延时

2、添加usb printer库

3、各库均已配合demo测试




 













 

 














  

 








 














 





 

  

   




dengzhiqian




   

   







  

 



 

  


   

   

    
 
dengzhiqian


    
   


  

  

  



    




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    Ship It!
    
  
    
 
    

 
    
  


    
 
    
 
      

  

 
    


    

 
    

    2. 















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wushengyan




   

   







  

 



 

  


   

   

    
 
wushengyan


    
   


  

  

  



    




  1. 
 
    
  
    
   
    Ship It!
    
  
    
 
    

 
    
  


    
 
    
 
      

  

 
    


    

 
    

    2. 















  2. 
 
    
  
    
   
    
  
    
 
    

 
    
  


    
 
    
 
      

  

 
    


    

 
    

    3. 




  

 
















 



 

  

   




taoqiwen




   

   

  

 



 

  


   

   

    
 Review request changed

    
   


  

  

  






 

  Status:
  

  Closed (submitted)

  
 







 


 










  

 









     

    

   

  

  

   
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