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CCS/TMS320F280049: PWM generation

Susan Yang
Genius 9955 points
Part Number: TMS320F280049


Tool/software: Code Composer Studio

Dear team

My customer wanted to generate PWM wave as the following picture.

In the previous interrupt, a narrow pulse is generated; the next interrupt generates a wide pulse, the same comparison value is applied.

They tried to modify the output polarity without success.

Please help.




 


 

								


				
				

				
			

		

			
						
									
                			    			            
						
						
			
			
			
			                        
			

				

			


			

		


				    			

						

















	

	

					
    
	
    





		
	
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                          TI__Guru
                        52040 points
                      
    
                          
                   		
		
    
					
    Double your period value.
    

    

    Now every one of the triangles is 2x wider.
    

    On the CTR increasing to PRD value, set CMPA to the value for the short pulse, CMPB = PRD-CMPA.
    

    Output A goes high at CTR=ZERO and LOW at CTR=CMPA.
    

    Output B goes high at CTR=CMPA and LOW at CMPB.
    

    

    On the CTR decreasing (down count),
    

    Output B goes high at CTR=PRD and LOW at CMPB
    

    Output A goes high at CTR=CMPB and LOW at CMPA.
    

    

    

    You dont ever have to change the setting now. It will automatically create the waveform you want.
    

    

    Nima
    

    

    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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