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PSoC™ 5, 3 & 1

Anonymous
Not applicable

I try to read counter register. I'm sure thatTimer_24 works.

   

in main loop

   

       Timer24_ReadTimerSaveCV(&readTimer);   
        LCD_Position(1,1); 
        LCD_PrHexInt(readTimer);

   

but LCD shows me only 0000, I couldyn't find why.

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4 Replies
Anonymous
Not applicable

I found out that Capture must be set to low, but I don't know why

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ETRO_SSN583
Esteemed Contributor

The f() you use does not have any parameters, but it returns what

   

you want.

   

 

   

Timer16_wReadTimerSaveCV

   

 

   

   
    
     Description:    
    
     Reads the current Timer16 Count register value, while preserving the Compare registers. This performs a software-solicited, hardware-synchronous counter capture operation. This function should only be used if the contents of the Compare register must be preserved. If the Compare register contents do not need to be preserved, then using the wReadTimer() function is preferred. Note that this API routine used to be called wReadCounter.    
    
     C Prototype:    
    
     
WORD  Timer16_wReadTimerSaveCV(void);   
    
    
     Assembly:    
    
     
lcall  Timer16_wReadTimerSaveCV 
     
mov   [wCount], X           ; MSB returned in X
     
mov   [wCount+1], A         ; LSB returned in A
    
    
     Parameters:    
    
     None    
    
     Return Value:    
    
     wCount: Count register contents. MSB is passed in the X register and LSB is passed in the Accumulator.    
   
   

   

 

   

 

   

So you should have something like -

   

 

   

readTimer = Timer24_ReadTimerSaveCV( );  

   

 

   

Regards, Dana.

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Anonymous
Not applicable

it's  right for 16bit timers, but for 24bits timers datasheet says

   

Timer24_ReadTimerSaveCV

   
    
     Description:    
    
     Reads the current Timer24 Count register value, while preserving the Compare registers. This performs a software-solicited, hardware-synchronous counter capture operation. This function should only be used if the contents of the Compare register must be preserved. If the Compare register contents do not need to be preserved, then using the ReadTimer() function is preferred. Note that this API routine used to be called ReadCounter.    
    
     C Prototype:    
    
     
void Timer24_ReadTimerSaveCV(DWORD * pdwCount);   
    
    
     Assembly:    
    
     
mov   A,[pdwCount]
     
mov   X,[pdwCount+1]
     
lcall _Timer24_ReadTimerSaveCV
    
   
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ETRO_SSN583
Esteemed Contributor

There is a note in datasheet that alludes to an issue with Capture,

   

but is not "complete" in its warning, or so I think -

   

 

   
    
     Capture    
    
     

This parameter is selected from one of the available sources. A rising edge on this input causes the Count register to be transferred to the Compare register. The software capture mechanism will not operate correctly if this parameter is set to a value of one or is held high externally.

     

 

    
   
   

Regards, Dana.

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