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RTOS/TM4C1294NCPDT: Getting full time period in the timer.

Piyush Pandey
Intellectual 390 points
Part Number: TM4C1294NCPDT

Tool/software: TI-RTOS

Hello guys,

I am using the timer in my code , the archived file of which is attached to this post , https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/908/TimerTest.7zb

but I am unable to use the timer as I waned.

Actually first of all I do not know whether the timer is 32 bit or not, meanwhile assuming that timer is 32 bit , I want it to run continuously upto its maximum count of 0xffffffff and than reset to zero and again start counting in the upward direction upto its maximum value.

So I want to know that how can I achieve this in my this code.

Please suggest the proper parameters.

regards


								


				
				

				
			

		

			
						
									
                			    			                        
						
						
			
			
						
			                        
			
			
				
			  
			

			     
			

		


				    			

						
















	

	

					
    
	
    





		
	
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                          TI__Mastermind
                        18260 points
                      
    
                          
                   		
		
    
					
    Hi Piyush,
    

    The SYS/BIOS Timer module for TM4C1294NCPDT programs the timer in the down-counting mode.  It uses the timer in 32-bit mode, so the period register is 32-bits.  FYI, this GPT timer can count both up or down, and in 16-bit or 32-bit mode, but SYS/BIOS doesn't provide any interface to affect this and is hard-coded to down-counting 32-bit.
    

    If you use a Timer_Params.periodType of Timer_PeriodType_COUNTS and a Timer_Params.period value of 0xFFFFFFFF then the timer will count down from 0xFFFFFFFF to 0 and get reloaded with 0xFFFFFFFF on the next cycle.  With this setup, if you use ~Timer_getCount() then you should be able to achieve a sequence that starts at 0 and counts up to 0xFFFFFFFF, rolling over to 0 on the next cycle.
    

    Regards,
    

    - Rob
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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                          Intellectual
                        390 points
                      
    
                          
                   		
		
    
					
    Also , is it possible to program this timer in such a way that it counts from 0 to 0xffffffff in 1 second of time period , I mean when the timer complete its count from 0 to 0xffffffff , the time elapsed should be of  1 second.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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                          TI__Mastermind
                        18260 points
                      
    
                          
                   		
		
    
					
    Piyush Pandey22 said:
    Also , is it possible to program this timer in such a way that it counts from 0 to 0xffffffff in 1 second of time period , I mean when the timer complete its count from 0 to 0xffffffff , the time elapsed should be of 1 second.
    

    No, this would require a 4 GHz timer clock.  The timer counter register is just counting the clock pulses on its input.  There are a variety of inputs that can be selected, but none are 4 GHz (or even in the GHz range).
    

    Regards,
    

    - Rob
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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