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ADV7280 Not Recommended for New Designs
The ADV7280 / ADV7280-M are versatile one-chip, multiformat video decoders. The ADV7280 / ADV7280-M automatically detect standard analog baseband video...
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ADV7280A-M + Raspberry Pi 4: Bottom of image appears at top (vertical offset on some inputs)

		
	
				

			

									
					    3hl3rt
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Nov 4, 2025 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user is experiencing vertical image shifting and color issues with certain composite video cameras when using the ADV7280A-M with a Raspberry Pi 4. The solution involves switching the ADV7280 from ITU-R BT.656-3 to BT.656-4 mode by setting bit 7 of the User Map register 0x04 to 1. Ensure the correct crystal clock (28.6363 MHz) is selected in the script.
                        	    

                
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Category: Hardware

    		        		            		    
Product Number:  ADV7280-M, ADV7280 

    		        		    		    

		    		    
		    			

			    
We’re working with a custom PCB that connects a composite video camera to an ADV7280A-M and then outputs MIPI-CSI2 to a Raspberry Pi 4.




We’re using the official Raspberry Pi Linux driver:


github.com/.../adv7180.c


and took inspiration from this project:


github.com/.../ADV7280-Raspi-shield




The video stream works — but with certain analog camera sources (for example, Framos CVBS modules) the image is shifted vertically:


the bottom ~20 lines of the picture wrap around and appear at the top, as shown below:


 


text seem to have weird colors:




 




With other cameras the image is perfectly aligned, so the issue might depend on the input signal timing.




Hardware setup:


    

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    Custom PCB using ADV7280A-M (8× CVBS inputs, MIPI CSI-2 output)
    

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    Connected directly to Raspberry Pi 4 Model B CSI port
    

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    Kernel: rpi-6.12.y, using stock adv7180.c driver
    

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    No modifications to driver except input selection via sub-device
    

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    •  Analog Employees  
    •  Super User  
    
            
						
                            
            
            				
            
                on Nov 5, 2025 7:26 AM
            
            
						
			            		
    
		
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    Hi,
    

      Kindly note that, By default the ADV7280 outputs according to the ITU-R BT.656-3 specification. There are extra blanking lines in the vertical blanking period for NTSC signals in ITU-R BT.656-3 mode compared to ITU-R BT.656-4 mode.
    

    You can switch between the ITU-R BT.656-3 mode and ITU-R BT.656-4 output mode by toggling the User Map register 0x04 bit [7].
            0: (default) BT656-3 mode
            1: BT656-4 mode
    Also make sure with crystal clock (i.e) you are providing correct 'XTAL 28.6363' and your script selects 28.63636 crystal.  
    

    

    Thanks,
    

    Poornima
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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