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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
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 adsp-bf533
                
                                                    
                 Audio Signal Processors
                
                                                    
                 Blackfin Embedded Processors
                
                                                    
                 adsp-bf506f
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      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
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      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
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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