Multi-Button CSM with Pic16LF722A

[RWright]

Wow! Thanks alot for all of that great info, much appreciated. Gives me something to learn from, too. I'm kind of new to this, so I haven't gotten that advanced, yet. First time I've had to use
the capacitive touch module. Again, much appreciated!

[RWright]

Hello again!

If I want to change the order of the keys so that key0 = 1/0 (RB2), key1 = down(RB1), and key2 = up(RB0) do I need to un-remark the
;key0=portb.0=ch0, key1=portb.1=ch1, key2=portb.2=ch2 statement and change it, or do I need to change the code in the main portion of the program?

Is there any way I can get the 1/0 button to toggle between off and full pwm, right now I am only getting a momentary break in the pwm when it is touched.

In the debug setup, all I need to do is monitor the pin specified with Serial Communicator or Hyperterminal?

I still can't believe how simple you made this look compared to my listing posted above. Thanks again!

[richard]

If I want to change the order of the keys so that key0 = 1/0 (RB2), key1 = down(RB1), and key2 = up(RB0) do I need to un-remark the
;key0=portb.0=ch0, key1=portb.1=ch1, key2=portb.2=ch2 statement and change it, or do I need to change the code in the main portion of the program?

comments are just that ,they only serve to show what it is that the programmer decides need an explanation . they don't get compiled or participate in the execution of the code in any way. to change the way the keys are interpreted requires a change the code .

right now I am only getting a momentary break in the pwm when it is touched

my mistake the pw var should also be set to zero too when killing the light

In the debug setup, all I need to do is monitor the pin specified with Serial Communicator or Hyperterminal

I use a pickit2 to pgm/debug with ,the debug statements suit my setup . if you use a real rs232 port to debug then a rs232/ttl level converter needs to be used and the logic level may need to be inverted [rtfm]

Is there any way I can get the 1/0 button to toggle between off and full pwm,

should be easy , hint "FINITE STATE MACHINE"


what did your "threshold" count need to be ?
why not explore a "limited slew rate filter" to automatically track and adjust the threshold value . or more reliable yet, automatically track and adjust the threshold value for each individual key

[RWright]

Hi,

Thanks for the info. Right now I am using 16000 as a threshold, and it seems to be working well. I have a pickit2, maybe I'll try that. I also have a usb to serial in both 3v and 5v versions. I've been looking at the Microchip application notes concerning touch applications and ran across what you are talking about concerning the threshold value for each key. Maybe once I get into the debugging, I can determine if I will need to do more than a fixed threshold. Thanks again!

[richard]

There is a "pause 300" that you have in the MAIN program area that delays the led indicator change from the time that the button is pressed. I tried to move the code

the pause is there to slow the key action to human speeds ,the indicator leds can go in the key pressed loop ok as far as I can see

What is "if PW.15 then PW=0" doing? Is it checking bit 15 of PW to be high?

with any subtraction if the result is negative (ie overflowed) then the highest order bit of the result is always set.


ps can porta.3 be an output ?



have a try like this

'#DEFINE DBUG 1 
 #CONFIG
 __config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDTE_OFF & _BOR_OFF & _PLLEN_ON
 #ENDCONFIG

 define OSC 4
 include "dt_ints-14.bas"
 include "REENTERPBP.bas"
 ' variables used by interrupt handler, comment out as per assembler
 wsave VAR BYTE $20 SYSTEM ' location for W if in bank0
 'wsave VAR BYTE $70 SYSTEM ' alternate save location for W 
 ' if using $70, comment wsave1-3
 ' --- IF any of these three lines cause an error ?? ------------------------
 ' Comment them out to fix the problem ----
 ' -- Which variables are needed, depends on the Chip you are using -- 
 wsave1 VAR BYTE $A0 SYSTEM ' location for W if in bank1
 'wsave2 VAR BYTE $120 SYSTEM ' location for W if in bank2
 'wsave3 VAR BYTE $1A0 SYSTEM ' location for W if in bank3
 asm
 INT_LIST macro
 INT_HANDLER T1GATE_INT, _TB1, PBP,YES
 endm
 INT_CREATE
 ENDASM

 THRESH CON 16000 'needs to be established

 FLG VAR BYTE 'GOT A KEY 
 KP VAR BYTE 'WHICH KEY pressed
 key_inx var byte ;key index
 PW VAR WORD ;PULSEWIDTH
 p_level var byte

 DEFINE DEBUG_REG PORTB
 DEFINE DEBUG_BIT 7 ;pgd
 DEFINE DEBUG_BAUD 9600
 DEFINE DEBUG_MODE 0 


 OSCCON = %00010000 '4 mhz
 CPSCON0 = %10001100 'high range
 CPSCON1 = 0 'cps ch 0


 ANSELB = %00000111 'SETS INPUTS B0-B2 AS ANALOG
 TRISB = %01111111 'SETS INPUTS B0-B5 AS INPUTS b7 output
 WPUB = %00000000 'DISABLES WEAK PULL-UP BITS
 TRISC = %11111011 'ccp1 output portc.2

 OPTION_REG=$86 'edge int. prescale 1:128
 PIE1.7=1 'timer1 gate interrupt
 T1GCON=$f9 'single shot timer0 overflow as input
 T1CON=%11000101 'capsense as input no prescale no sync
 INTCON= $C0 'peripheral interrupts
 PW=1023
 p_level=5
 t2con=7 
 LED1 VAR PORTA.1 ' SET LED LEVEL INDICATORS
 LED2 VAR PORTA.2
 LED3 VAR PORTA.3  ;?????????????????????????????????
 LED4 VAR PORTA.4
 LED5 VAR PORTA.5

 LED VAR portc.2
 ;up down off
 ;key0=portb.0=ch0, key1=portb.1=ch1, key2=portb.2=ch2



 #IFDEF DBUG 

 portb.7=1
 LED=1 
 pause 2000
 Debug "Start",13 ,10
 LED=0
 pause 500 
 #ENDIF 
 ccp1con=12
 CCPR1L=255 'SET TO MAX BRIGHTNESS
 FLG=0 
 key_inx=0



 MAIN:
 IF FLG=1 THEN 
 IF KP = 0 THEN '1/0 BUTTON PRESSED
 ccp1con=0 ;kill it
 led=0
 p_level=0
 ELSEif KP = 1 THEN 'UP BUTTON PRESSED
 p_level= (p_level+1) min 5 
 ;PW= (PW+256) MIN 1023 
 else 'DOWN BUTTON PRESSED
 p_level= p_level-1
 ;PW = PW-256 
 IF p_level.7 THEN p_level=0 
 ;IF PW.15 THEN PW=0 
 
 
 
 lookup p_level, [0,12,48,218,586,1023],pw  'gamma 1.35,5 levels plus OFF
 CCPR1L = PW>>2;
 ccp1con=12|((PW&3)<<4);
 #IFDEF DBUG 
 debug "KEY ",#KP,13,10 
 debug #PW,13,10 
 #ENDIF
 PAUSE 300
 FLG=0 'clr key pressed flag
 ENDIF
 
 porta=0  ;all leds off
 IF p_level= 5 THEN
 HIGH LED5
 ENDIF
 IF p_level=4 THEN
 HIGH LED4
 ENDIF
 IF p_level=3 THEN
 HIGH LED3
 ENDIF
 IF p_level=2 THEN
 HIGH LED2
 ENDIF
 if p_level=1 THEN 
 high LED1
 endif
ENDIF

 GOTO MAIN 


 TB1: 
 #IFDEF DBUG 
 debug #TMR1,13,10
 #ENDIF
 IF TMR1 < THRESH THEN ' KEY DETECTED 
 if !flg then
 KP=key_inx 
 FLG=1 'set key pressed flag
 endif
 ENDIF
 key_inx=key_inx+1 ;check next key
 if key_inx > 2 then key_inx=0 
 CPSCON1 = key_inx
 TMR1=0
 T1GCON.3= 1 ;single shot reset


 @ INT_RETURN

[RWright]

Hello again,

Okay I got the buttons to work as i wished, and I changed to 4 pwm levels. However, I have added code to indicate which of the 4 levels I am currently at.
There is a "pause 300" that you have in the MAIN program area that delays the led indicator change from the time that the button is pressed. I tried to move the code for the led indicators to a point before the "pause 300", but then the program quits working. Is this pause what determines the time between steps if a[ button is continuously pressed, or does it serve another purpose? Another dumb thing, if I want 5 levels plus off, as shown in my previously posted example, how do I do it? Currently I am using a value of 256 from the original 16 as you had to get 4 steps, but that works out pretty evenly.

What is "if PW.15 then PW=0" doing? Is it checking bit 15 of PW to be high? Please see cod attached.

Thanks.


[CODE'********************************************* *******************
'* Name : CAPSENSE.BAS *
'* Author : RICHARD *
'* Notice : Copyright (c) 2011 [select VIEW...EDITOR OPTIONS] *
'* : All Rights Reserved *
'* Date : 10/20/2011 *
'* Version : 1.0 *
'* Notes : *
'* : 16LF722A *
' *
'************************************************* ***************

'#DEFINE DBUG 1
#CONFIG
__config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDTE_OFF & _BOR_OFF & _PLLEN_ON
#ENDCONFIG

define OSC 4
include "dt_ints-14.bas"
include "REENTERPBP.bas"
' variables used by interrupt handler, comment out as per assembler
wsave VAR BYTE $20 SYSTEM ' location for W if in bank0
'wsave VAR BYTE $70 SYSTEM ' alternate save location for W
' if using $70, comment wsave1-3
' --- IF any of these three lines cause an error ?? ------------------------
' Comment them out to fix the problem ----
' -- Which variables are needed, depends on the Chip you are using --
wsave1 VAR BYTE $A0 SYSTEM ' location for W if in bank1
'wsave2 VAR BYTE $120 SYSTEM ' location for W if in bank2
'wsave3 VAR BYTE $1A0 SYSTEM ' location for W if in bank3
asm
INT_LIST macro
INT_HANDLER T1GATE_INT, _TB1, PBP,YES
endm
INT_CREATE
ENDASM

THRESH CON 16000 'needs to be established

FLG VAR BYTE 'GOT A KEY
KP VAR BYTE 'WHICH KEY pressed
key_inx var byte ;key index
PW VAR WORD ;PULSEWIDTH

DEFINE DEBUG_REG PORTB
DEFINE DEBUG_BIT 7 ;pgd
DEFINE DEBUG_BAUD 9600
DEFINE DEBUG_MODE 0


OSCCON = %00010000 '4 mhz
CPSCON0 = %10001100 'high range
CPSCON1 = 0 'cps ch 0


ANSELB = %00000111 'SETS INPUTS B0-B2 AS ANALOG
TRISB = %01111111 'SETS INPUTS B0-B5 AS INPUTS b7 output
WPUB = %00000000 'DISABLES WEAK PULL-UP BITS
TRISC = %11111011 'ccp1 output portc.2

OPTION_REG=$86 'edge int. prescale 1:128
PIE1.7=1 'timer1 gate interrupt
T1GCON=$f9 'single shot timer0 overflow as input
T1CON=%11000101 'capsense as input no prescale no sync
INTCON= $C0 'peripheral interrupts
PW=1023
t2con=7
LED1 VAR PORTA.1 ' SET LED LEVEL INDICATORS
LED2 VAR PORTA.2
LED3 VAR PORTA.3
LED4 VAR PORTA.4
LED5 VAR PORTA.5

LED VAR portc.2
;up down off
;key0=portb.0=ch0, key1=portb.1=ch1, key2=portb.2=ch2



#IFDEF DBUG

portb.7=1
LED=1
pause 2000
Debug "Start",13 ,10
LED=0
pause 500
#ENDIF
ccp1con=12
CCPR1L=255 'SET TO MAX BRIGHTNESS
FLG=0
key_inx=0



MAIN:
IF FLG=1 THEN
IF KP = 0 THEN '1/0 BUTTON PRESSED
ccp1con=0 ;kill it
led=0
PW=0
ELSEif KP = 1 THEN 'UP BUTTON PRESSED
PW= (PW+256) MIN 1023
else 'DOWN BUTTON PRESSED
PW = PW-256
IF PW.15 THEN PW=0
ENDIF
CCPR1L = PW>>2;
ccp1con=12|((PW&3)<<4);
#IFDEF DBUG
debug "KEY ",#KP,13,10
debug #PW,13,10
#ENDIF



PAUSE 300
FLG=0 'clr key pressed flag
ENDIF

IF pw = 1023 THEN
HIGH LED5
ENDIF
IF pw = 768 or PW = 767 THEN
HIGH LED4
ENDIF
IF pw = 512 or PW = 511 THEN
HIGH LED3
ENDIF
IF pw = 256 or PW = 255 THEN
HIGH LED2
ENDIF
if pw = 0 THEN
high LED1
endif


GOTO MAIN


TB1:
#IFDEF DBUG
debug #TMR1,13,10
#ENDIF
IF TMR1 < THRESH THEN ' KEY DETECTED
if !flg then
KP=key_inx
FLG=1 'set key pressed flag
endif
ENDIF
key_inx=key_inx+1 ;check next key
if key_inx > 2 then key_inx=0
CPSCON1 = key_inx
TMR1=0
T1GCON.3= 1 ;single shot reset


@ INT_RETURN][/CODE]