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Capturing and writing the IQ data using AD9361_iiostream.c



		

			

									
						eee_33
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Aug 18, 2017 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi everyone,

 
I am recently  trying to understand how AD9361_iiostream.c code to work and I have some questions on the file AD9361_iiostream.c. 

 
    
  
  • I understand that there is a limit to the buffer. Does this mean we can get maximum 1048576 samples in 1 millisecond with this created buffer?   "rxbuf = iio_device_create_buffer(rx, 1024*1024, false);"
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  • I am trying to modify this code to write the IQ data from the channel to a file. For example, is it possible to capture a signal continuously with 5 MHz bandwidth and a sampling rate 50 Msps for 1 second and write it to the file without losing any sample?
    • 
 

 
Thanks,

 
Baris

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			








	
	
	
	



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													0
							
			
				
									
							        
            
                                    			
			                            
                        
                on Aug 18, 2017 8:47 PM
            
            
					
    
	
    

		
		
    
					
    Hi Lars, 
    
 
    Thanks for your reply.
    
 
    Should I modify the code as follows?
    
 
    rxbuf = iio_device_create_buffer(rx, 1024*1024, false);
    
 
    for(i=0;i<1000;i++)
    
 
    {
    
 
    nbytes_rx = iio_buffer_refill(rxbuf);
    
 
        for (iio_buffer_first(rxbuf, rx0_i); p_dat < p_end; p_dat += p_inc)
    
 
       {const int16_t i = ((int16_t*)p_dat)[0];
    
 
       const int16_t q = ((int16_t*)p_dat)[1];
    
 
       fprintf(file,"%d %d,i,q);}
    
 
    }
    
 
    With this code I get 1024*1024*1000 samples from the channel for total 1 second, do I?
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                    			
			                            
                        
                on Aug 18, 2017 8:47 PM
            
            
					
    
	
    

		
		
    
					
    Hi Lars, 
    
 
    Thanks for your reply.
    
 
    Should I modify the code as follows?
    
 
    rxbuf = iio_device_create_buffer(rx, 1024*1024, false);
    
 
    for(i=0;i<1000;i++)
    
 
    {
    
 
    nbytes_rx = iio_buffer_refill(rxbuf);
    
 
        for (iio_buffer_first(rxbuf, rx0_i); p_dat < p_end; p_dat += p_inc)
    
 
       {const int16_t i = ((int16_t*)p_dat)[0];
    
 
       const int16_t q = ((int16_t*)p_dat)[1];
    
 
       fprintf(file,"%d %d,i,q);}
    
 
    }
    
 
    With this code I get 1024*1024*1000 samples from the channel for total 1 second, do I?
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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