• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 78 subscribers
  • Views 2702 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Using Timer_A for Reference Frequency Measurement

Nkolas Stavrou
Prodigy 240 points
Other Parts Discussed in Thread: MSP430F157

Hi, because of the fact that i am new on the MSP430 ultra low power microcontroller, is anyone who can help me solve the above?

Initially i am trying using the IAR to write on the MSP430F157 microcontroller a capture Interrupt service routine for external 50Hz reference frequency. The programe is: 

HCCR2   PUSH     R5
        MOV      CCR2,R5
        SUB      VZC_LASTCAP,R5
        MOV      VZC_DELTA,VZC_2DELTA
        ADD      R5,VZC_2DELTA
        MOV      R5,VZC_DELTA
        MOV      CCR2,VZC_LASTCAP
CAP2_END POP   R5
        RETI
        JMP $    

Why the IAR doesnt recognise the VZC_DELTA, VZC_2DELTA and VZC_LASTCAP,2?

Is it something which should be Defined before starting writing the program?

Thanks in advance, if someone knows please reply.

  • 0
    Guru 58965 points

    You probably did not declare those variables. Or, the declarations are "out of scope".

     

  • 0 in reply to old_cow_yellow
    Prodigy 240 points

    Thansk  a lot, but i am trying to declare them without any possitive result. Do you know the method how?

     

     

  • 0 in reply to Nkolas Stavrou
    Guru 58965 points 

    

    #include "msp430x15x.h"

                    ORG     0200h
    ; other variables in RAM
    VZC_LASTCAP     ds      2
    VZC_DELTA       ds      2
    VZC_2DELTA      ds      2
    ; other variables in RAM

                    ORG     8000h
    ; other code/counstant in FLASH
    main            mov     #5A80h,&WDTCTL
    ; ... the rest of main ...

    ; other code/counstant in FLASH
    TAISR           bic     #CCIFG,&CCTL2
    HCCR2           PUSH    R5
                    MOV     CCR2,R5
                    SUB     VZC_LASTCAP,R5
                    MOV     VZC_DELTA,VZC_2DELTA
                    ADD     R5,VZC_2DELTA
                    MOV     R5,VZC_DELTA
                    MOV     CCR2,VZC_LASTCAP
    CAP2_END        POP     R5
                    RETI
    ; other code/constant in FLASH

                    ORG     0FFEAh
                    dw      TAISR

                    ORG     0FFFEh
                    dw      main

                    end
    

     
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
    • 

		
	
  • 
		
    
			 


	
		
	
	









    
	
    
		
    
							
					
    
		
    
			
													0
							
			
				
									
							
						
				
			
			
			
												
						in reply to old_cow_yellow
					
									
    
	
    
	                                    
                      
    
                        
                          Prodigy
                        240 points
                      
    
                          
                   		
		
    
					
    Thanks a lot  old_cow_yellow , i will try it.
    

     Iam appreciating for your interest.
    

    Nikolas.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
    • 

    



		
	


			





















        
        
            



	

		
**Attention**  This is a public forum