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The AD9375 is a highly integrated, wideband radio frequency (RF) transceiver offering dual-channel transmitters (Tx) and receivers (Rx), integrated synthesizers...
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IIO: How to differentiate between input and output channels with the same name



		

			

									
					    gavint
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 2, 2024 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		        
    Category: Software
    
    		        		            		    
    Product Number:  ad9375 
    
    		        		        		        
    Software Version: 2022_R2
    
    		    		    	
			
    Hello
    

    I am using the IIO device driver for the AD9375. I am using version 2022_R2 of the meta-adi layer for Petalinux.
    

    

    I have hopefully a simple question.
    

    I am trying to select a specific IIO channel on the AD9375. It has two output channels named voltage0 and voltage1 and three input channels named voltage0, voltage1 and voltage2.
    

    To select a channel I have been using iio_device_find_channel() which uses the name ("voltage0", "voltage1", etc). 
    

    How do  I choose whether I want to find / select the input channel or the output channel? I assume there must be a function but I am unable to find it.
    

    

    Thank you.
    

    Gavin
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 iio
                
                                                    
                 software
                
                                                    
                 2022_R2
                
                                                    
                 ad9375
                
                                                    
                 Wideband Transceiver IC
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
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													0
							
			
				
									
							        
			
			
			
        
            
						
                            
            
            				
            
                on Feb 2, 2024 9:37 AM
            
            
					
        
	
        

		
		
        
					
        Here is what iio_info prints out:


        

               iio:device2: ad9371-phy
                23 channels found:
                        altvoltage0: RX_LO (output)
                        2 channel-specific attributes found:
                                attr  0: frequency value: 2500000000
                                attr  1: label value: RX_LO
                        voltage1:  (output)
                        34 channel-specific attributes found:
                                attr  0: clgc_current_gain value: 0
                                attr  1: clgc_desired_gain value: -200
                                attr  2: clgc_orx_rms value: 0
                                attr  3: clgc_status value: 0
                                attr  4: clgc_track_count value: 0
                                attr  5: clgc_tracking_en value: 0
                                attr  6: clgc_tx_gain value: 0
                                attr  7: clgc_tx_rms value: 0
                                attr  8: dpd_actuator_en value: 1
                                attr  9: dpd_external_path_delay value: 2488
                                attr 10: dpd_model_error value: 1000
                                attr 11: dpd_reset_en value: 0
                                attr 12: dpd_status value: 0
                                attr 13: dpd_track_count value: 0
                                attr 14: dpd_tracking_en value: 0
                                attr 15: hardwaregain value: -10.000000 dB
                                attr 16: lo_leakage_tracking_en value: 0
                                attr 17: quadrature_tracking_en value: 1
                                attr 18: rf_bandwidth value: 75000000
                                attr 19: sampling_frequency value: 250000000
                                attr 20: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                                attr 21: vswr_forward_gain value: 0
                                attr 22: vswr_forward_gain_imag value: 0
                                attr 23: vswr_forward_gain_real value: 0
                                attr 24: vswr_forward_orx value: 0
                                attr 25: vswr_forward_tx value: 0
                                attr 26: vswr_reflected_gain value: 0
                                attr 27: vswr_reflected_gain_imag value: 0
                                attr 28: vswr_reflected_gain_real value: 0
                                attr 29: vswr_reflected_orx value: 0
                                attr 30: vswr_reflected_tx value: 0
                                attr 31: vswr_status value: 0
                                attr 32: vswr_track_count value: 0
                                attr 33: vswr_tracking_en value: 0
                        voltage0:  (output)
                        34 channel-specific attributes found:
                                attr  0: clgc_current_gain value: 0
                                attr  1: clgc_desired_gain value: -200
                                attr  2: clgc_orx_rms value: 0
                                attr  3: clgc_status value: 0
                                attr  4: clgc_track_count value: 0
                                attr  5: clgc_tracking_en value: 0
                                attr  6: clgc_tx_gain value: 0
                                attr  7: clgc_tx_rms value: 0
                                attr  8: dpd_actuator_en value: 1
                                attr  9: dpd_external_path_delay value: 2297
                                attr 10: dpd_model_error value: 1000
                                attr 11: dpd_reset_en value: 0
                                attr 12: dpd_status value: 0
                                attr 13: dpd_track_count value: 0
                                attr 14: dpd_tracking_en value: 0
                                attr 15: hardwaregain value: -10.000000 dB
                                attr 16: lo_leakage_tracking_en value: 0
                                attr 17: quadrature_tracking_en value: 1
                                attr 18: rf_bandwidth value: 75000000
                                attr 19: sampling_frequency value: 250000000
                                attr 20: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                                attr 21: vswr_forward_gain value: 0
                                attr 22: vswr_forward_gain_imag value: 0
                                attr 23: vswr_forward_gain_real value: 0
                                attr 24: vswr_forward_orx value: 0
                                attr 25: vswr_forward_tx value: 0
                                attr 26: vswr_reflected_gain value: 0
                                attr 27: vswr_reflected_gain_imag value: 0
                                attr 28: vswr_reflected_gain_real value: 0
                                attr 29: vswr_reflected_orx value: 0
                                attr 30: vswr_reflected_tx value: 0
                                attr 31: vswr_status value: 0
                                attr 32: vswr_track_count value: 0
                                attr 33: vswr_tracking_en value: 0
                        voltage9:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage8:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage2:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage2:  (input)
                        10 channel-specific attributes found:
                                attr  0: gain_control_mode value: manual
                                attr  1: gain_control_mode_available value: manual automatic hybrid
                                attr  2: hardwaregain value: -190.000000 dB
                                attr  3: quadrature_tracking_en value: 0
                                attr  4: rf_bandwidth value: 200000000
                                attr  5: rf_port_select value: INTERNALCALS
                                attr  6: rf_port_select_available value: OFF INTERNALCALS OBS_SNIFFER SN_A SN_B SN_C ORX1_TX_LO ORX2_TX_LO ORX1_SN_LO ORX2_SN_LO
                                attr  7: rssi value: 41.00 dB
                                attr  8: sampling_frequency value: 250000000
                                attr  9: temp_comp_gain value: 0.00 dB
                        altvoltage2: RX_SN_LO (output)
                        2 channel-specific attributes found:
                                attr  0: frequency value: 2600000000
                                attr  1: label value: RX_SN_LO
                        voltage5:  (input)
                        5 channel-specific attributes found:
                                attr  0: gain_control_mode_available value: manual automatic hybrid
                                attr  1: offset value: 45
                                attr  2: raw value: 189
                                attr  3: rf_port_select_available value: OFF INTERNALCALS OBS_SNIFFER SN_A SN_B SN_C ORX1_TX_LO ORX2_TX_LO ORX1_SN_LO ORX2_SN_LO
                                attr  4: scale value: 0.775194
                        voltage6:  (input)
                        5 channel-specific attributes found:
                                attr  0: gain_control_mode_available value: manual automatic hybrid
                                attr  1: offset value: 45
                                attr  2: raw value: 506
                                attr  3: rf_port_select_available value: OFF INTERNALCALS OBS_SNIFFER SN_A SN_B SN_C ORX1_TX_LO ORX2_TX_LO ORX1_SN_LO ORX2_SN_LO
                                attr  4: scale value: 0.775194
                        voltage3:  (input)
                        5 channel-specific attributes found:
                                attr  0: gain_control_mode_available value: manual automatic hybrid
                                attr  1: offset value: 45
                                attr  2: raw value: 691
                                attr  3: rf_port_select_available value: OFF INTERNALCALS OBS_SNIFFER SN_A SN_B SN_C ORX1_TX_LO ORX2_TX_LO ORX1_SN_LO ORX2_SN_LO
                                attr  4: scale value: 0.775194
                        voltage6:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage4:  (input)
                        5 channel-specific attributes found:
                                attr  0: gain_control_mode_available value: manual automatic hybrid
                                attr  1: offset value: 45
                                attr  2: raw value: 37
                                attr  3: rf_port_select_available value: OFF INTERNALCALS OBS_SNIFFER SN_A SN_B SN_C ORX1_TX_LO ORX2_TX_LO ORX1_SN_LO ORX2_SN_LO
                                attr  4: scale value: 0.775194
                        voltage5:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage1:  (input)
                        9 channel-specific attributes found:
                                attr  0: gain_control_mode value: manual
                                attr  1: gain_control_mode_available value: manual automatic hybrid
                                attr  2: hardwaregain value: 30.000000 dB
                                attr  3: quadrature_tracking_en value: 1
                                attr  4: rf_bandwidth value: 100000000
                                attr  5: rf_port_select_available value: OFF INTERNALCALS OBS_SNIFFER SN_A SN_B SN_C ORX1_TX_LO ORX2_TX_LO ORX1_SN_LO ORX2_SN_LO
                                attr  6: rssi value: 44.750 dB
                                attr  7: sampling_frequency value: 125000000
                                attr  8: temp_comp_gain value: 0.00 dB
                        voltage3:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage10:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage4:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage11:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        voltage7:  (output)
                        5 channel-specific attributes found:
                                attr  0: offset value: 204
                                attr  1: raw value: 0
                                attr  2: sampling_frequency value: 250000000
                                attr  3: scale value: 1.560671
                                attr  4: scale_available value: 0.783951 0.798128 0.810932 0.822608 1.560671 1.590157 1.613612 1.637490
                        altvoltage1: TX_LO (output)
                        2 channel-specific attributes found:
                                attr  0: frequency value: 2500000000
                                attr  1: label value: TX_LO
                        voltage0:  (input)
                        9 channel-specific attributes found:
                                attr  0: gain_control_mode value: manual
                                attr  1: gain_control_mode_available value: manual automatic hybrid
                                attr  2: hardwaregain value: 30.000000 dB
                                attr  3: quadrature_tracking_en value: 1
                                attr  4: rf_bandwidth value: 100000000
                                attr  5: rf_port_select_available value: OFF INTERNALCALS OBS_SNIFFER SN_A SN_B SN_C ORX1_TX_LO ORX2_TX_LO ORX1_SN_LO ORX2_SN_LO
                                attr  6: rssi value: 44.750 dB
                                attr  7: sampling_frequency value: 125000000
                                attr  8: temp_comp_gain value: 0.00 dB
                        temp:  (input)
                        2 channel-specific attributes found:
                                attr  0: raw value: 56
                                attr  1: scale value: 1000.000000
                16 device-specific attributes found:
                                attr  0: calibrate value: 0
                                attr  1: calibrate_clgc_en value: 0
                                attr  2: calibrate_dpd_en value: 0
                                attr  3: calibrate_loopback_rx_lo_delay_en value: 0
                                attr  4: calibrate_loopback_rx_rx_qec_en value: 0
                                attr  5: calibrate_rx_lo_delay_en value: 0
                                attr  6: calibrate_rx_qec_en value: 0
                                attr  7: calibrate_tx_lol_en value: 0
                                attr  8: calibrate_tx_lol_ext_en value: 0
                                attr  9: calibrate_tx_qec_en value: 0
                                attr 10: calibrate_vswr_en value: 0
                                attr 11: ensm_mode value: radio_on
                                attr 12: ensm_mode_available value: radio_on radio_off
                                attr 13: gain_table_config ERROR: Permission denied (13)
                                attr 14: large_lo_step_calibration_en value: 0
                                attr 15: profile_config value: TB
        

        

        I want to set the hardware gain of a specific channel (either TX channel or RX channel), but I can't find the right IIO function to specify which channel I want to access:
        


        voltage0 (output)
        

        or
        

        voltage0 (input).
        

        

        I hope I am making sense.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													+1
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Feb 2, 2024 9:49 AM
            
            
												
						in reply to gavint
					
									
          
	
          

		
		
          
					
          Sorry, my bad. There is a parameter in iio_device_find_channel which specifies whether it is an output or an input:
          

          /** @brief Try to find a channel structure by its name of ID
           * @param dev A pointer to an iio_device structure
           * @param name A NULL-terminated string corresponding to the name or the ID of
           * the channel to search for
           * @param output True if the searched channel is output, False otherwise
           * @return On success, a pointer to an iio_channel structure
           * @return If the name or ID does not correspond to any known channel of the
           * given device, NULL is returned */
          __api __check_ret __pure struct iio_channel * iio_device_find_channel(
           const struct iio_device *dev, const char *name, bool output);
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
						
						
				
				
		
		
          
			
		
          
	
          

          

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