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ADRV9008-1 Recommended for New Designs
The receive path consists of two independent, wide bandwidth (BW), direct conversion receivers with state-of-the-art dynamic range. The complete receive...
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Reduce frequency change time (ADRV9008-1)



		

			

									
					    JehoLee
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 16, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    

    I'm using ADRV9008-1 + my custom board.
    

    I developed an application using a IIO driver to change the LO frequency of ADRV9008-1. 
    

    Refer to the iio_attr program.(https://github.com/analogdevicesinc/libiio/blob/master/tests/iio_attr.c)
    

    Since the frequency change time is important, the execution time was measured with the clock_get time function. a code is below.
    

    -----
    

    clock_gettime(CLOCK_MONOTONIC, &t_begin);
     sprintf(sCenterFreq, "%llu", center_freq);
     if(iio_channel_attr_write(ch, attr, sCenterFreq) < 0){
     DebugLog((SLOG_ERROR, "* Error : Can't write frequency attribute\n"));
     shutdown_iio();
     return TFAIL;
     }
     clock_gettime(CLOCK_MONOTONIC, &t_end);
     t_result = 1000000000 * (t_end.tv_sec - t_begin.tv_sec) + (t_end.tv_nsec - t_begin.tv_nsec);
     printf("iio_channel_attr_write : %lf sec\n", (double)t_result / 1000000000);
    

    ------
    

    As a result, the change time was 100ms.This time is too long.
    

    Is there any way to reduce this time as much as possible?
    

    

    thanks.
    
										

    
				add thanks.
    
[edited by: JehoLee at 11:36 AM (GMT -4) on 16 Sep 2021]
				
    
					
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		






				

			
    
			
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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Sep 17, 2021 2:37 AM
            
            
												
						in reply to mhennerich
					
									
        
	
        

		
		
        
					
        Thank you for reply.
        

        I checked RF PLL FREQUENCY HOPPING section in UG-1295.
        

        In the document, the TALISE_* function is used, which is a function used in Barmetal environment.
        

        In linux, ADRV9008-1 is IIO device. I understand that the device is controlled using Libiio.
        

        However, libiio cannot find an attribute that sets the FHM. (set hopping mode, the bound of the frequency hopping... etc.)
        

        What method should I use to develop it on Linux?
        

        How to use the functions used by UG1295 in a Linux environment?
        

        Thanks.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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