Matrix Keypad routine

**Kalind** · - 1st October 2008, 15:54

i have written this code. its just that im really confused and lost as to how to begin with the keypad. i kinda figured out how to hook up the keypad though. i just need help as to how to go about doing the code

skimask · - 1st October 2008, 16:00

Originally Posted by Kalind

i have written this code. its just that im really confused and lost as to how to begin with the keypad. i kinda figured out how to hook up the keypad though. i just need help as to how to go about doing the code

I am HELPING. No need for whiney PM's.
Key word here is HELPING...not DOING.
I think you'll find a whole lot of people around here willing to HELP...some might even be willing to DO.
Write some code, in fact, don't even write code, just write a sequence of thoughts of how you think the program should operate. The code will follow. That's how it works. You think about something and it happens eventually.
As far as your keypad goes, what's wrong with the code that's provided earlier in the thread? I use it...works great for me.

**Kalind** · - 1st October 2008, 16:05

well, i was thinking that when i push "Button A" of the keyapd, the upper setpoint will be displayed, "Button B" = Lower limit, "Button C" = Backspace, "Button D" = OK , "Button *" = alarm on/off, "Button #" = Main screen

skimask · - 1st October 2008, 16:06

Originally Posted by Kalind

well, i was thinking that when i push "Button A" of the keyapd, the upper setpoint will be displayed, "Button B" = Lower limit, "Button C" = Backspace, "Button D" = OK , "Button *" = alarm on/off, "Button #" = Main screen

Ok, so you've defined the FUNCTIONs of the buttons...now how to you act on those functions.
In fact, do yourself a favor and just work on adding one button at a time...

**Kalind** · - 1st October 2008, 16:12

thats my point. I have no idea where to begin...i was thinking maybe scan keypad first, check if A or B was pressed and if so then act upon it by prompting the user to enter a desired setpoint. once that's done, press ok and return to the main display screen. the alarm can be set on for the desired lower setpoint and once the upper setpoint has been reached, the relay should switch on. vice versa

skimask · - 1st October 2008, 16:14

Originally Posted by Kalind

thats my point. I have no idea where to begin...i was thinking maybe scan keypad first, check if A or B was pressed and if so then act upon it by prompting the user to enter a desired setpoint. once that's done, press ok and return to the main display screen. the alarm can be set on for the desired lower setpoint and once the upper setpoint has been reached, the relay should switch on. vice versa

Then write some code and see how it works!
If it doesn't work, post the code, and I'm sure somebody will help you figure it out.

**Archangel** · - 1st October 2008, 17:50

The first thing to do is open Mr. E's Keypad.bas and read the instructions he wrote for you.

**Archangel** · - 5th October 2008, 06:25

Originally Posted by Kalind

well, i was thinking that when i push "Button A" of the keyapd, the upper setpoint will be displayed, "Button B" = Lower limit, "Button C" = Backspace, "Button D" = OK , "Button *" = alarm on/off, "Button #" = Main screen

Code:

InterruptHandler:
@ READKEYPAD _MyVar
resume
'now your key reading is stored in MyVar

most 16 key keypads are laid out 123A 456B 789C *0#D, so 1=1 2=2 3=3 A=4 4=5 . . . .
You can use this as is or use a lookup routine to alias the actual port reading to what
you want, like so:

Code:

lookup MyVar,[0,"123A456B789C*0#D"],MyOtherVar

now your key information stored in myOtherVar will mirror your keypad.
so . . .

Code:

If myothervar = A then gosub Uppersetpoint
if MyOtherVar = b then gosub . . . .easy

**chrisshortys** · - 20th November 2008, 16:06

Hay guys and girls. I've been playing around with this coding this afternoon and i keep getting errors and when i dont nothing going as i thought it should so any chance somone could point out whats wrong please or point me in the right dirrection at least!

My main coding:

Code:

TRISA=%00000011
TRISB=%00000000
TRISC=%11111110
ADCON0=%11000000
ADCON1=%00000111 
INCLUDE "KeyPad.bas"         

    '                      
    '    Hardware connection
    '    ===================
    DEFINE KEYPAD_ROW        8       ' 8 row 
    define KEYPAD_ROW_PORT   PORTc   '   on PORTB
    DEFINE KEYPAD_ROW_BIT    0       '      <7:0>
    DEFINE KEYPAD_COL        4       ' 4 col 
    DEFINE KEYPAD_COL_PORT   PORTc   '   on PORTA
    DEFINE KEYPAD_COL_BIT    0       '      <3:0>
    DEFINE KEYPAD_DEBOUNCEMS 200     ' debounce delay = 200 mSec
    define KEYPAD_AUTOREPEAT 1       ' use auto-repeat
' LCD Display
' -----------
' Adjust these to suit your chosen LCD pinout
'
DEFINE LCD_DREG PORTb 			'Define PIC port used for LCD Data lines
DEFINE LCD_DBIT 4 			'Define first pin of portb connected to LCD DB4
DEFINE LCD_RSREG PORTb 			'Define PIC port used for RS line of LCD
DEFINE LCD_RSBIT 3 			'Define Portb pin used for RS connection
DEFINE LCD_EREG PORTb 			'Define PIC prot used for E line of LCD
DEFINE LCD_EBIT 0 			'Define PortB pin used for E connection
DEFINE LCD_BITS 4 			'Define the 4 bit communication mode to LCD
DEFINE LCD_LINES 2 			'Define using a 2 line LCD
DEFINE LCD_COMMANDUS 2000 		'Define delay between sending LCD commands
DEFINE LCD_DATAUS 50 			'Define delay time between data sent.
    
    '
    '    Serial Communication definition
    '    ===============================
    DEFINE HSER_TXSTA 24h            ' enable transmit, BRGH=1
    DEFINE HSER_SPBRG 129            ' 9600 Bauds

    '   
    '    Variables definition 
    '    ===================
    myvar                    var byte

    '    ---------------------------------[Program Start]----------------------------------------------
start:
    @ READKEYPAD _myvar
    hserout ["Key=",dec myvar,13,10]
	gosub lcddisp
    goto start

lcddisp:
LCDOUT $FE, 1, myvar
pause 60
return
end

The modified Keypad code

Code:

TRISA=%00000011
TRISB=%00000000
TRISC=%11111110
ADCON0=%11000000
ADCON1=%00000111 
INCLUDE "KeyPad.bas"         

    '                      
    '    Hardware connection
    '    ===================
    DEFINE KEYPAD_ROW        8       ' 8 row 
    define KEYPAD_ROW_PORT   PORTc   '   on PORTB
    DEFINE KEYPAD_ROW_BIT    0       '      <7:0>
    DEFINE KEYPAD_COL        4       ' 4 col 
    DEFINE KEYPAD_COL_PORT   PORTc   '   on PORTA
    DEFINE KEYPAD_COL_BIT    0       '      <3:0>
    DEFINE KEYPAD_DEBOUNCEMS 200     ' debounce delay = 200 mSec
    define KEYPAD_AUTOREPEAT 1       ' use auto-repeat
' LCD Display
' -----------
' Adjust these to suit your chosen LCD pinout
'
DEFINE LCD_DREG PORTb 			'Define PIC port used for LCD Data lines
DEFINE LCD_DBIT 4 			'Define first pin of portb connected to LCD DB4
DEFINE LCD_RSREG PORTb 			'Define PIC port used for RS line of LCD
DEFINE LCD_RSBIT 3 			'Define Portb pin used for RS connection
DEFINE LCD_EREG PORTb 			'Define PIC prot used for E line of LCD
DEFINE LCD_EBIT 0 			'Define PortB pin used for E connection
DEFINE LCD_BITS 4 			'Define the 4 bit communication mode to LCD
DEFINE LCD_LINES 2 			'Define using a 2 line LCD
DEFINE LCD_COMMANDUS 2000 		'Define delay between sending LCD commands
DEFINE LCD_DATAUS 50 			'Define delay time between data sent.
    
    '
    '    Serial Communication definition
    '    ===============================
    DEFINE HSER_TXSTA 24h            ' enable transmit, BRGH=1
    DEFINE HSER_SPBRG 129            ' 9600 Bauds

    '   
    '    Variables definition 
    '    ===================
    myvar                    var byte

    '    ---------------------------------[Program Start]----------------------------------------------
start:
    @ READKEYPAD _myvar
    hserout ["Key=",dec myvar,13,10]
	gosub lcddisp
    goto start

lcddisp:
LCDOUT $FE, 1, myvar
pause 60
return
end

forgot to put the error code

Executing: "C:\Program Files\Microchip\MPASM Suite\MPAsmWin.exe" /q /p16F876A "KEYPADTE.ASM" /l"KEYPADTE.lst" /e"KEYPADTE.err"
Error[113] C:\PBP\PBPPIC14.LIB 2784 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2785 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2789 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2790 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2800 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2871 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2889 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2913 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2920 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2928 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\PBPPIC14.LIB 2934 : Symbol not previously defined (PORTb)
Error[113] C:\PBP\KEYPADTE.ASM 100 : Symbol not previously defined (PORTc)
Error[113] C:\PBP\KEYPADTE.ASM 103 : Symbol not previously defined (PORTc)
Error[113] C:\PBP\KEYPADTE.ASM 125 : Symbol not previously defined (PORTc)
Error[113] C:\PBP\KEYPADTE.ASM 136 : Symbol not previously defined (PORTc)
Halting build on first failure as requested.
BUILD FAILED: Thu Nov 20 16:00:57 2008

**mister_e** · - 20th November 2008, 18:13

YUP, that's what happen when you don't check the spelling of your DEFINEs. DEFINEs are case sensitive. So PORTb have to be written PORTB, and so on with all others.

**chrisshortys** · - 20th November 2008, 18:35

Cheers, so any clues as to whats wrong now? i dont get any reaction on the LCD and i get several ports flash high then low

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