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Will this program work on PIC18F66K80?

 
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ricperez



Joined: 25 Apr 2007
Posts: 14

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Will this program work on PIC18F66K80?
PostPosted: Tue Oct 06, 2015 3:46 pm     Reply with quote
Hi.
I'm planning to use the indicated part to detect the activation of 8 capacitive buttons. I'm new to capsense and I wonder if the solution published by "robomaniac" sometime ago (which I copied below) will work with my part since the capsense units for 16LF722 and 18F66K80 are substantially different.
I'll appreciate any guidance to get started.

Thanks!

http://www.ccsinfo.com/forum/viewtopic.php?t=42107
http://www.ccsinfo.com/forum/viewtopic.php?t=37024&highlight=mtouch
Built-in mTouch™ capacitive sensing module
Code:

#include <16lf722.h>

#fuses INTRC_IO,NOWDT,VCAP_A5
#use delay(INTERNAL=8Mhz)

#use rs232(baud=9600,rcv=PIN_C7,xmit=PIN_C6)
#use touchpad(scantime=32ms,threshold=6,PIN_B0='C',PIN_B1='5',PIN_B3='3')

#define GREEN_LED1   PIN_C2
#define GREEN_LED2   PIN_C3

//=========================

void main(void)
{
   char c;

   enable_interrupts(GLOBAL);

   output_high(GREEN_LED1);
   output_high(GREEN_LED2);
   delay_ms(300);
   output_low(GREEN_LED1);
   output_low(GREEN_LED2);

   while(1)
   {
      //   TOUCHPAD_STATE(1); //calibrates, then enters normal state
            if(touchpad_hit())
            {
               c=touchpad_getc();
               putc(c);
               
               if(c=='C')
                  output_toggle(GREEN_LED1);
   
               if(c=='5')
                  output_toggle(GREEN_LED2);
            }// end if
       
   } // end while
}// main
Ttelmah



Joined: 11 Mar 2010
Posts: 19318

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PostPosted: Wed Oct 07, 2015 7:59 am     Reply with quote
Without writing code for your chip, and building a suitable capacitive keypad, we don't know.

Generally, the CCS functions do work, and do support the CTMU, as well as the CSM devices (this was added several dozen compiler versions ago).

The problem in the other thread you attached to the tail of, was that at that time (new chip), the support for the capacitive module had not been correctly added to the data base, and so I showed the poster how to do this themselves.

Different resources on the chip are required depending on the module (read the section entitled 'purpose' in the manual under the touchpad entry). Note also that 'SOURCETIME' only applies when using the CTMU.
Then also note that all of the capacitive sensing solutions do require calibration. The code you pointed to, incorrectly had this in the actual while loop, and then has it disabled. Basically you need to have this somewhere where it can be called when the values have drifted (they will as the weather changes etc.), and the calibration values then stored, otherwise 'long term' the results can become unreliable...
ricperez



Joined: 25 Apr 2007
Posts: 14

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Your advice regarding use of CTMU
PostPosted: Fri Oct 09, 2015 10:22 am     Reply with quote
Thanks Ttelmah, I'll follow your advice, though CTMU looks more "unfriendly" than CSM.
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