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Unable to write to SPI register

Jonas Axelsson
Prodigy 220 points


Hi,

 

I cant write to the register DMA0CTRL ( unsigned DMACTRL[8U]; in .h file ) in any of the 3 SPI modules. I am in privilege mode when I try. I can write to some others registers in the module. I even try to write manually with the emulator through editing the memory space but nothing happens. I use CCS 4.

Regards

Jonas

  • 0
    TI__Guru**** 198546 points

    Jonas,

    Please bring the SPI out of reset , enable SPI multibuffered mode first, then write DMAxCTRL registers:

     /** bring SPI out of reset */
        spiREG1->GCR0 = 1U;

     /** enable SPI1 multibuffered mode and enable buffer RAM */
        spiREG1->MIBSPIE = 1U;
    

    SPI2 and SPI4 don't have DMA ciontrol registers since they are SPI only.
    

    

    Regards,
    

    QJ
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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