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i2c on BF537 stamp



		

			

									
					    feucom
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 8, 2012 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    I have problems to get a i2c communication between the BF537 and simple i2c device (LM75) running. 
    
 
    my question: i would expect to find something like /dev/i2c-0 in the /dev directory. 
    
 
    what I have is:
    
 
    root:/dev> ls
    
 
    console             network_throughput  ram14               random
    
 
    cpu_dma_latency     null                ram15               rtc0
    
 
    fd                  ptmx                ram2                stderr
    
 
    foo                 pts                 ram3                stdin
    
 
    full                ram0                ram4                stdout
    
 
    kmsg                ram1                ram5                tty
    
 
    log                 ram10               ram6                ttyBF0
    
 
    mdev.seq            ram11               ram7                urandom
    
 
    mem                 ram12               ram8                watchdog
    
 
    network_latency     ram13               ram9                zero
    
 
    does that mean that my kernel is not i2c capable?
    
 
    and if not, since I flagged i2c support (x), what should I do else?
    
 
    thanks in advance
    
 
    Ralph
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Apr 11, 2012 5:39 AM
            
            
					
        
	
        

		
		
        
					
        Thanks Sonic,
        
 
        after following Aaronwus advice to change M to Y in the kernel settings 
        
 
        (M = module, I expected to enable all child options ...??)
        
 
        plus some recompilation trails I found out
        
 
        Device Drivers  ---> 
        
 
              {*} I2C support  ---> 
        
 
             <*>   I2C device interface
        
 
             I2C Hardware Bus support  --->
        
 
                  <*> Blackfin TWI I2C suppor
        
 
        I didn't enable Blackfin TWI2C support as you mentioned in your last post. after that it works
        
 
        some functions expect a link in the path /dev/i2c-0 similar to gpio interface
        
 
        the entry however is under:
        
 
        root:/sys/devices/platform/i2c-bfin-twi.0/i2c-0
        
 
        anyway for me it's fine
        
 
        thanks for your help
        
 
        Ralph
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Apr 11, 2012 5:39 AM
            
            
					
          
	
          

		
		
          
					
          Thanks Sonic,
          
 
          after following Aaronwus advice to change M to Y in the kernel settings 
          
 
          (M = module, I expected to enable all child options ...??)
          
 
          plus some recompilation trails I found out
          
 
          Device Drivers  ---> 
          
 
                {*} I2C support  ---> 
          
 
               <*>   I2C device interface
          
 
               I2C Hardware Bus support  --->
          
 
                    <*> Blackfin TWI I2C suppor
          
 
          I didn't enable Blackfin TWI2C support as you mentioned in your last post. after that it works
          
 
          some functions expect a link in the path /dev/i2c-0 similar to gpio interface
          
 
          the entry however is under:
          
 
          root:/sys/devices/platform/i2c-bfin-twi.0/i2c-0
          
 
          anyway for me it's fine
          
 
          thanks for your help
          
 
          Ralph
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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