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#use capture can be 2 channels?

 
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Shishido



Joined: 09 Mar 2014
Posts: 10

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#use capture can be 2 channels?
PostPosted: Fri Apr 10, 2015 5:10 pm     Reply with quote
I want to measure capture time by 2 channels such as CCP1 and CCP2.

However, it seems to [#use capture......] can be set only 1 channel as below.
Code:

#include <16f1938.h>
#DEVICE  ADC=10
#fuses  INTRC_IO,NOWDT,NOPROTECT,PUT,NOCPD,NOLVP,BROWNOUT,PLL_SW
#use delay(clock = 8M)
#use RS232(BAUD =19200, XMIT=PIN_C6 ,RCV=PIN_C7) 
#use capture(CCP1, FASTEST, CAPTURE_RISING, timer=1, define=capture_ticks_per_second, fastest)
#include <stdlib.h>

float32 GetFrequency(void);
//
main(){
float32 time;

time=GetFrequency();
printf("Freq=%5.2lf ",time);
}

//
float32  GetFrequency(void)
{
float32 t;
get_capture_time();
while (!get_capture_event());
t=get_capture_time();
while (!get_capture_event());
t=get_capture_time() - t;
Return(capture_ticks_per_second / t);
}

How can I measure capture time both CCP1 and CCP2 used by [#use capture........] ?
jeremiah



Joined: 20 Jul 2010
Posts: 1358

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PostPosted: Fri Apr 10, 2015 6:11 pm     Reply with quote
As with just about any #use, there is a "stream" option. Make two different #use capture() directives and assign them different streams. Then supply the stream arguments for capture methods.
Shishido



Joined: 09 Mar 2014
Posts: 10

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Thanks
PostPosted: Fri Apr 10, 2015 10:31 pm     Reply with quote
>
jeremiah wrote:
As with just about any #use, there is a "stream" option. >Make two different #use capture() directives and assign them different >streams. Then supply the stream arguments for capture methods.



Thank you for your quick reply. I am not familiar with 'stream' option of #use capture.
Sorry for your trouble, could you please let me know for make 2 different sample #use capture (........ stream=id) ?

Regards!
jeremiah



Joined: 20 Jul 2010
Posts: 1358

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PostPosted: Sat Apr 11, 2015 12:12 am     Reply with quote
without having any background using your chip:

Code:

#use capture(CCP1, FASTEST, CAPTURE_RISING, timer=1, define=capture_ticks_per_second, fastest, stream=CCP1_STREAM)
#use capture(CCP2, FASTEST, CAPTURE_RISING, timer=1, define=capture_ticks_per_second, fastest, stream=CCP2_STREAM)

void main(){
   int16 v1,v2;

   while(TRUE){
      if(get_capture_event(CCP1_STREAM)){
         v1 = get_capture_time(CCP1_STREAM);
      }
      if(get_capture_event(CCP2_STREAM)){
         v2 = get_capture_time(CCP2_STREAM);
      }
   }
}



Didn't test this for compilation or correctness...just an example of using stream identifiers.
Shishido



Joined: 09 Mar 2014
Posts: 10

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PostPosted: Sat Apr 11, 2015 2:43 am     Reply with quote
jeremiah wrote:
without having any background using your chip:

Code:

#use capture(CCP1, FASTEST, CAPTURE_RISING, timer=1, define=capture_ticks_per_second, fastest, stream=CCP1_STREAM)
#use capture(CCP2, FASTEST, CAPTURE_RISING, timer=1, define=capture_ticks_per_second, fastest, stream=CCP2_STREAM)

void main(){
   int16 v1,v2;

   while(TRUE){
      if(get_capture_event(CCP1_STREAM)){
         v1 = get_capture_time(CCP1_STREAM);
      }
      if(get_capture_event(CCP2_STREAM)){
         v2 = get_capture_time(CCP2_STREAM);
      }
   }
}



Didn't test this for compilation or correctness...just an example of using stream identifiers.


//////////////////////////////////////
Thanks! However I face compile error when double [#use capture] defined.

--- Info 300 "PWM_1.c" Line 13(1,1): More info: Timer 1 tick is 500 ns
*** Error 99 "PWM_1.c" Line 14(5,116): Option invalid Bad Option: DEFINE
temtronic



Joined: 01 Jul 2010
Posts: 9255
Location: Greensville,Ontario

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PostPosted: Sat Apr 11, 2015 7:00 am     Reply with quote
hmm...

define=capture_ticks_per_second


compiler doesn't 'like' this. Check the PIC header to see what options for DEFINE are valid.


Jay
Shishido



Joined: 09 Mar 2014
Posts: 10

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Resolves
PostPosted: Sat Apr 11, 2015 7:17 am     Reply with quote
temtronic wrote:
hmm...

define=capture_ticks_per_second


compiler doesn't 'like' this. Check the PIC header to see what options for DEFINE are valid.


Jay


///////////////////////////////////
Thank you very much again, finally resolved problem

#use capture(CCP3, FASTEST, CAPTURE_RISING, timer=1, stream=CCP1_IN,define=capture_ticks_per_second1,fastest)
#use capture(CCP4, FASTEST, CAPTURE_RISING, timer=1, stream=CCP2_IN,define=capture_ticks_per_second2,fastest)
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