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ADAU1401 Not Recommended for New Designs
The ADAU1401 is a complete single-chip audio system with a 28-/56-bit audio DSP, ADCs, DACs, and microcontroller-like control interfaces. Signal processing...
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ADAU1401 on Analog.com

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Choose different EQ Presets / Filter with GPIOs



		

			

									
					    MarkusAD
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 19, 2012 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    i want to choose between different EQ Presets / Filter via GPIO Pins.
    
 
    I have a ADAU1401 and he is connected to a microcontroller via I²C. 6 GPIO Pins are connected directly to the microcontroller. The signal which I want to change is delivered via I²S, input is the GPIO Pin 1 (MP1 - Input Sdata_in1) and output ist the GPIO Pin 6 (MP6 - Sdata_out0).
    
 
    Is it possible to set a value for the 6 Pins (000000 - 111111 [i don't need so many options]), read that value, look, which preset it stands for and "switch this on" ? I could only find a Toggle button function for going through a list of different presets.
    
 
    I hope i described my problem good enough. I never did anything before with dsp and filter etc. Would be great if somebody could help me.
    
 
    Thanks.
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Jul 19, 2012 7:42 PM
            
            
					
      
	
      

		
		
      
					
      In order to do this, you need to do two basic things:
      
 
        
  
      • Create a GPIO-to-Index converter.
        • 
  
      • Use an index-selectable filter cell for your presets.
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      GPIO-to-Index converter:
      
 
        
  
      • For each GPIO input pin, create the following three cells:
   
          
    
        • GPIO input
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        • DC source
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        • Multiply
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        • 
  
      • Hook them up like this:
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        Fullscreen
        a8a8ecd5e3c6ab157be1e03565d0d706.html
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      <html><head><title>Jive SBS</title></head>
<body><font face="arial,helvetica,sans-serif">
<b>Error</b><br><font size="-1">
An general error occurred while processing your request.
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      • This takes the 5.23 GPIO input and converts it to a 28.0 integer number. The LSB should be multiplied by 1, the next bit by 2, the next bit by 4, and so on...
        • 
  
      • You then sum up those inputs to create a single integer index number based on the binary adder for the GPIO inputs.
   
          
    
        • In my example below, I used 4 bits to create an index value that goes between 0 and 15.
          • 
   
        • 
 
      
 
      



      
    
      
        Fullscreen
        b7ca10f90bd213dcf784bd0f13e42760.html
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      <html><head><title>Jive SBS</title></head>
<body><font face="arial,helvetica,sans-serif">
<b>Error</b><br><font size="-1">
An general error occurred while processing your request.
</font></font></body></html>

      

      


      
 
        
  
      • Now, use this as the input to an index-selectable cell that will act as your EQ. I used the IdxSelectable Indp. Multiple Band Filter. The help document attached explains the use of this cell.
        • 
  
      • Here is the finished product:
        • 
 
      
 
      



      
    
      
        Fullscreen
        cbcb5910834dfaa7d9e4c5ca8f64b846.html
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      <html><head><title>Jive SBS</title></head>
<body><font face="arial,helvetica,sans-serif">
<b>Error</b><br><font size="-1">
An general error occurred while processing your request.
</font></font></body></html>

      

      


      
 
 
      Brett
      
			
      

		
			
	      

		
				attachments.zip
			
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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                on Jul 20, 2012 8:46 AM
            
            
					
        
	
        

		
		
        
					
        Hello Brett,
        
 
        thank you very much for your fast and detailed reply. This is exactly what i need. In my case i just use the GPIO Pins 1 & 6 for Audio Input & Output.
        
 
        
 
        But I think there is the problem. The audio input signal is a digital signal over I²S in I²S audio mode. The idxSelectbale MBF needs an analog signal. Is there a way to convert the signal? I could not find anything in the SigmaStudio.
        
 
        One more question i have is why is the IdxSelectable Indp. Multiple Band Filter limited to 16? (it is enough for my purpose) Just want to know for understanding.
        
 
        Thank you for your help in this matter.
        
 
        Markus
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
			                            
                        
                on Jul 20, 2012 3:10 PM
            
            
					
        
	
        

		
		
        
					
        Hi Markus,
        
 
        Actually, the way to access digital audio data is not to use the "GPIO Input" and "GPIO Output" cells (GPIO_1 and GPIO_6 in your project). Those cells are only used when GPIO inputs/outputs are digital control signals.
        
 
        When you use the serial ports, the audio signals appear on the input cells and output cells.
        
 
        Please see here for documentation:
        
 
        http://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/io/input
        
 
        http://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/io/output
        
 
        (and just for reference, your project should look like this)
        
 
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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                on Jul 23, 2012 7:23 AM
            
            
					
          
	
          

		
		
          
					
          Hello Brett,
          
 
          thank you very much for your reply. I thought i have to use the pins. Now i can start to implement my project.
          
 
          Have a nice day.
          
 
          Markus
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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          •  Analog Employees  
          •  Super User  
          
            
			                            
                        
                on Aug 9, 2021 2:31 PM
            
            
												
						in reply to phanduchoang
					
									
          
	
          

		
		
          
					
          We need a lot more info and your question should be on a new thread. 
          

          What processor are you using?
          

          What are you trying to do? The function?
          

          Dave T
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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