• State Verified Answer
  • Replies 6 replies
  • Subscribers 45 subscribers
  • Views 569 views
  • Users 0 members are here
Options
Similar Content 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
BF506F UART example - error handling doesn't work



		

			

									
					    ZdenekZ
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 11, 2012 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hallo,
    
 
    I'm working on ADSP-BF506F ver 0.0 EZ-Kit and UART echo example (VisualDSP++ 5.0 Update 10). I want to test the driver robustness and trying to catch any line failures. Using command pair  {ADI_UART_CMD_SET_LINE_STATUS_EVENTS, (void *)TRUE} and transmitting chars from the PC to the board with faulty baudrate will provide unexpected neverending loop. When I enable deferred callbacks, line status isn't handled anymore. The functionality of handling line status of the driver is completely different in comparison with ADSP-BF533 - where is line status handling safe.
    
 
    Thanks a lot, Zdenek
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Sep 12, 2012 10:46 AM
            
            
					
      
	
      

		
		
      
					
      Hi Zdenek,
      
 
      Can you provide a copy of your modified UART Echo example?
      
 
      Regards,
      
 
      Craig.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

      • 

	

    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Sep 13, 2012 8:36 AM
            
            
					
        
	
        

		
		
        
					
        Hi Craig,
        
 
        I send you whole project in the attachment. If I change baudrate of the 
        
 
        PC Hyperterminal to 19200bd and send for example char 'k', framing error aren't 
        
 
        handled and program never come back from ISR. When I disable macro 
        
 
        USE_DEFERRED_CALLBACKS, frame error is indicating, but not only once, 
        
 
        but forever. The same settings works fine on BF533.
        
 
        Thanks you very much, Zdenek
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

        • 

	

      • 
	
        



	
		
	
	



        
	
        
		
        
							
					
        
		
        
			
													0
							
			
				
									
							        
			
			
			
        •  Analog Employees  
        
            
			                            
                        
                on Sep 18, 2012 9:47 AM
            
            
					
        
	
        

		
		
        
					
        Hi,
        
 
        I have asked my colleagues in the Device Driver development team to take a look into this issue. We will get back to you as soon as possible.
        
 

        Regards,
        
 
        Craig.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

        • 

	

      • 
	
        



	
		
	
	



        
	
        
		
        
							
					
        
		
        
			
													0
							
			
				
									
							        
			
			
			
        •  Analog Employees  
        
            
			                            
                        
                on Oct 1, 2012 5:21 PM
            
            
					
        
	
        

		
		
        
					
        Hi Zdenek,
        
 
            Thank you very much for reporting the issue to us. We are able to reproduce the issue with the modified example that you have attached. After looking at the driver code we have identified a bug in interrupt handler which handles line status errors. The interrupt handler is not clearing the bits in the line status register which is causing the interrupt to be re-issued.
        
 
             The bits in the line status register were read-to-clear in the BF533 processor. But they are changed to write-to-clear in case of BF506 processor. So the driver works correctly in case of BF533 and not on BF506.
        
 
             We will fix this issue in the upcoming update of VisualDSP++ 5.0. As a workaround please copy the attached file (adi_uart.c) to 
        
 
        <Visual DSP Installation Dir>/Blackfin/lib/src/drivers/uart and add the adi_uart_int.c and adi_uart_dma.c files to your project.  The adi_uart_int.c and adi_uart_dma.c files can be found under the directory  <Visual DSP Installation Dir>/Blackfin/lib/src/drivers/uart.
        
 
        Thanks,
        
 
        Murali
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

        • 

	

      • 
	
        



	
		
	
	



        
	
        
		
        
							
					
        
		
        
			
													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Oct 2, 2012 9:18 AM
            
            
					
          
	
          

		
		
          
					
          Hi Murali and Craig,
          
 
          thank you very much for the support.
          
 
          Best regards, 
          
 
          Zdenek
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

          • 

	

        • 
	
          



	
			
		
	



          
	
          
		
          
							
					
          
		
          
			
													0
							
			
				
									
							        
			
			
			
          •  Analog Employees  
          
            
			                            
                        
                on Aug 2, 2018 12:39 PM
            
            
					
          
	
          

		
		
          
					
          This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

          Thank you,
          EZ Admin
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
				
						
						
				
				
		
		
          
			
		
          
	
          

          

          •