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AD5313R spi programming problem



		

			

									
					    pmarshall
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 28, 2015 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I am testing a board that has a AD5313R DAC by bit banging the SPI signals.  I have LDAC and Gain tied to ground.  I am clocking the part at about 200 Hz (very low speed).  My problem is that occasionally when I set a value the output will go to zero or the output will turn off.  I can consistently program the DACB to 32 dec and then program it to 64 dec and the DACB output will turn off.  If I send a command to turn DACB on it has the correct output voltage for value of 64 dec.
    
 
     
    
 
    I have a logic analyzer on the SPI bus and it does not show any issues.  Except when this happens the output voltages I program are correct.  I have some similar issues when programming DACA but I have repeated the above sequence many times.
    
 
     
    
 
    I am using command 3 (Write to and update DAC Channel n) to program the DACs.
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Voltage Output D/A Converters
                
                                                    
                 ad5313r
                
                                                    
                 Multichannel Voltage Output D/A Converters
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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													0
							
			
				
									
							        
			
			
			
        
            
						
                            
            
            				
            
                on Apr 10, 2017 4:05 PM
            
            
					
        
	
        

		
		
        
					
        Hi Mark,
        
 
        Thank you for your response. 
        I am using BF706, and SPI1 is interfacing with AD5313R. I want to use SPI1 MOSI to control DAC voltage, set it to half of the supply voltage. So my understanding is SPI1 MOSI should output a 2 byte data 0x0200 to DAC register, and 0x0031 is command and address for DAC.
        Here is my code. Please let me know what is wrong there:
        =======
        
 
        ADI_SPI_RESULT result;
        
 
        /* transceiver buffers */
         uint8_t Prologue[4];
        uint8_t TxBuffer[4] = {0x31, 0x00, 0x00, 0x02};
         uint8_t RxBuffer[4];
        
 
        /* transceiver configurations */
         ADI_SPI_TRANSCEIVER Transceiver1 = {&Prologue[0], 4, &TxBuffer[0], 4, &RxBuffer[0], 4};
        /* open the SPI driver */
         result = adi_spi_Open(1, SPIDriverMemory, (uint32_t)ADI_SPI_INT_MEMORY_SIZE, &hSpiDevice);
        
 
        /*
         * Use the driver API's to configure SPI
         */
         adi_spi_SetMaster(hSpiDevice, true); //LSB first
         adi_spi_SetHwSlaveSelect(hSpiDevice, true); //Slave select controlled by hardware
         adi_spi_SetSlaveSelect(hSpiDevice,ADI_SPI_SSEL_ENABLE1); //SPI slave select number
         adi_spi_SetWordSize(hSpiDevice, ADI_SPI_TRANSFER_16BIT);
         adi_spi_SetClock(hSpiDevice, 3U);
        
 
        /* No callbacks required*/
         result = adi_spi_RegisterCallback(hSpiDevice, NULL, NULL);
        
 
        /* Disable DMA */
         result = adi_spi_EnableDmaMode(hSpiDevice, false);
        
 
        /* submit the SPI transceiver's buffers */
         result = adi_spi_SubmitBuffer(hSpiDevice, &Transceiver1);
        
 
        =======
        
 
        Thank you in advance for your help,
        
 
        Shuang
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Apr 10, 2017 4:05 PM
            
            
					
          
	
          

		
		
          
					
          Hi Mark,
          
 
          Thank you for your response. 
          I am using BF706, and SPI1 is interfacing with AD5313R. I want to use SPI1 MOSI to control DAC voltage, set it to half of the supply voltage. So my understanding is SPI1 MOSI should output a 2 byte data 0x0200 to DAC register, and 0x0031 is command and address for DAC.
          Here is my code. Please let me know what is wrong there:
          =======
          
 
          ADI_SPI_RESULT result;
          
 
          /* transceiver buffers */
           uint8_t Prologue[4];
          uint8_t TxBuffer[4] = {0x31, 0x00, 0x00, 0x02};
           uint8_t RxBuffer[4];
          
 
          /* transceiver configurations */
           ADI_SPI_TRANSCEIVER Transceiver1 = {&Prologue[0], 4, &TxBuffer[0], 4, &RxBuffer[0], 4};
          /* open the SPI driver */
           result = adi_spi_Open(1, SPIDriverMemory, (uint32_t)ADI_SPI_INT_MEMORY_SIZE, &hSpiDevice);
          
 
          /*
           * Use the driver API's to configure SPI
           */
           adi_spi_SetMaster(hSpiDevice, true); //LSB first
           adi_spi_SetHwSlaveSelect(hSpiDevice, true); //Slave select controlled by hardware
           adi_spi_SetSlaveSelect(hSpiDevice,ADI_SPI_SSEL_ENABLE1); //SPI slave select number
           adi_spi_SetWordSize(hSpiDevice, ADI_SPI_TRANSFER_16BIT);
           adi_spi_SetClock(hSpiDevice, 3U);
          
 
          /* No callbacks required*/
           result = adi_spi_RegisterCallback(hSpiDevice, NULL, NULL);
          
 
          /* Disable DMA */
           result = adi_spi_EnableDmaMode(hSpiDevice, false);
          
 
          /* submit the SPI transceiver's buffers */
           result = adi_spi_SubmitBuffer(hSpiDevice, &Transceiver1);
          
 
          =======
          
 
          Thank you in advance for your help,
          
 
          Shuang
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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