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AD2428 Recommended for New Designs
The Automotive Audio Bus (A2B®) provides a multichannel, I2S/TDM link over distances of up to 15 m between nodes. It embeds bidirectional synchronous...
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AD2428 on Analog.com

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ad2428w play  TDM，8CH，48000K

		
	
				

			

									
					    nigelyan
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 6, 2023 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Software
    
    		        		            		    
    Product Number:  1 
    
    		        		        		        
    Software Version: 1.0
    
    		    		    
    
		    		    
		    			
    
			    
    hello,  ADI
    

    now we want to play TDM 8ch 48000k,  how to seting 0x41  and 0x42 ? 
    

    thanks 
    

    

    # i2cdbgr /dev/i2c2 0x68 read 1 0x0 100
    addr: 0x0 data : 0x50
    addr: 0x1 data : 0x0
    addr: 0x2 data : 0xad
    addr: 0x3 data : 0x28
    addr: 0x4 data : 0x1
    addr: 0x5 data : 0x1
    addr: 0x6 data : 0x0
    addr: 0x7 data : 0x0
    addr: 0x8 data : 0x0
    addr: 0x9 data : 0x1
    addr: 0xa data : 0x0
    addr: 0xb data : 0x0
    addr: 0xc data : 0x0
    addr: 0xd data : 0xb
    addr: 0xe data : 0x0
    addr: 0xf data : 0x9f
    addr: 0x10 data : 0x44
    addr: 0x11 data : 0x3
    addr: 0x12 data : 0x80
    addr: 0x13 data : 0x9f
    addr: 0x14 data : 0x1
    addr: 0x15 data : 0x0
    addr: 0x16 data : 0x0
    addr: 0x17 data : 0xff
    addr: 0x18 data : 0x0
    addr: 0x19 data : 0x0
    addr: 0x1a data : 0x1
    addr: 0x1b data : 0x0
    addr: 0x1c data : 0x0
    addr: 0x1d data : 0x0
    addr: 0x1e data : 0xef
    addr: 0x1f data : 0x0
    addr: 0x20 data : 0x0
    addr: 0x21 data : 0x0
    addr: 0x22 data : 0x0
    addr: 0x23 data : 0x0
    addr: 0x24 data : 0x0
    addr: 0x25 data : 0x79
    addr: 0x26 data : 0x0
    addr: 0x27 data : 0x0
    addr: 0x28 data : 0x0
    addr: 0x29 data : 0x40
    addr: 0x2a data : 0x0
    addr: 0x2b data : 0x0
    addr: 0x2c data : 0x0
    addr: 0x2d data : 0x0
    addr: 0x2e data : 0x0
    addr: 0x2f data : 0x0
    addr: 0x30 data : 0x0
    addr: 0x31 data : 0x0
    addr: 0x32 data : 0x9f
    addr: 0x33 data : 0x3
    addr: 0x34 data : 0xb
    addr: 0x35 data : 0x0
    addr: 0x36 data : 0x0
    addr: 0x37 data : 0x0
    addr: 0x38 data : 0x0
    addr: 0x39 data : 0x44
    addr: 0x3a data : 0x0
    addr: 0x3b data : 0x0
    addr: 0x3c data : 0x0
    addr: 0x3d data : 0x0
    addr: 0x3e data : 0x0
    addr: 0x3f data : 0x0
    addr: 0x40 data : 0x0
    addr: 0x41 data : 0x64
    addr: 0x42 data : 0x19
    addr: 0x43 data : 0x0
    addr: 0x44 data : 0x0
    addr: 0x45 data : 0x0
    addr: 0x46 data : 0x0
    addr: 0x47 data : 0x0
    addr: 0x48 data : 0x0
    addr: 0x49 data : 0x0
    addr: 0x4a data : 0x0
    addr: 0x4b data : 0x0
    addr: 0x4c data : 0x0
    addr: 0x4d data : 0x0
    addr: 0x4e data : 0x0
    addr: 0x4f data : 0x0
    addr: 0x50 data : 0x0
    addr: 0x51 data : 0x0
    addr: 0x52 data : 0x0
    addr: 0x53 data : 0x0
    addr: 0x54 data : 0x0
    addr: 0x55 data : 0x0
    addr: 0x56 data : 0x1
    addr: 0x57 data : 0x0
    addr: 0x58 data : 0x0
    addr: 0x59 data : 0x0
    addr: 0x5a data : 0x0
    addr: 0x5b data : 0x0
    addr: 0x5c data : 0x0
    addr: 0x5d data : 0x0
    addr: 0x5e data : 0x0
    addr: 0x5f data : 0x0
    addr: 0x60 data : 0x0
    addr: 0x61 data : 0x0
    addr: 0x62 data : 0x0
    addr: 0x63 data : 0x0
    #
    
			
    
			
									
		                             
                        

    
    
                                            
                 Audio Products
                
                                                    
                 software
                
                                                    
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                 Automotive Audio Bus (A<sup>2</sup>B®)
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 9, 2023 7:51 AM
            
            
						
			            		
      
		
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      Hi,
      

      Your old values:
      

      addr: 0x41 (I2SGCFG register) data : 0x64 - TDM16
      addr: 0x42 (I2SCFG register) data : 0x19 - RX0 enable, TX0 enable, TX BCLK invert set
      

      If we understand correctly, you want to change the TDM16 mode to TDM8 mode - so there is only one change needed to the I2SGCFG register. So, Update the addr:0x41 data value to 0x62
      

      Please keep in mind that you need to make your Host/SOC TDM mode also to TDM8 as well (for TDM8, 32-bit size and 48k sync (BCLK freq = 8*32*48k = 12.288MHz)). thanks
      

      Here are some basic concepts when working with I2S/TDM and A2B:
      

      Please note that the TDM interface operates independently at Main and Sub node. So the TDM settings can be different at both ends, but the interfaced devices settings must match. Check the TDM settings between A2B Main and SoC. Make sure the following settings are aligned correctly in your SW:
      

        

      • TDM mode (TDM2/TDM4/TDM8/TDM16/TDM32) – should be same between SoC and A2B Main (similarly between A2B Sub and peripheral)
        • 

      • TDM channel size (16-bit/32-bit) - should be same
        • 

      • Invert SYNC (Falling edge or rising edge) - should be same
        • 

      • Early SYNC (1Bit delay / No delay) - should be same
        • 

      • ALT SYNC (Pulse mode SYNC or 50% Duty cycle SYNC) - should be same
        • 

      • Driving/Sampling edge settings : for e.g. If a signal (Data and SYNC) is driven at rising edge of BCLK, it must be sampled at opposite edge of BCLK (i.e. at falling edge of SYNC) at the interfaced device.
        • 

      

      For additional info regarding those registers please refer to our technical reference manual (https://www.analog.com/media/en/technical-documentation/user-guides/ad242x-trm.pdf).
      


      Thanks,
      

      Raghava
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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