Help with keypad+lcd using 16F877A PIC in Mikrobasic

Tahmid · Feb 9, 2010

Hi,
I don't get it.
You're simulating in Proteus, but is the example with mikroBASIC code?
Tahmid.

rchly · Feb 10, 2010

sorry for the blur info.. =(

as mentioned in ur previous conversation, u said, Proteus providing examples of interfacing LCD n Keypad. With curiously, i plan to design a program with 2 keypad. But, in my 1st try, trying to run the original program(provided by proteus) using MPLab, failed. then tried on MicroBasics, problem stil occurred where, a proper .Hex file stil cant be generated.

Really dono why and how t do....

How to run the file provided by Proteus? Im trying to generate a new .hex file of my own because, i want to edit and program a new program of my own...

wat i suppose to do?

hope u understand..

pls help..

toto_na16 · Jul 3, 2010

Tahmid said:

Hi,
I added 48 to convert it to ASCII. This only works for numbers between 0 to 9.
Now I just provided ASCII without complicating matters.
Anyway, here's the new code:

Code:

program calculator

dim LCD_RS as sbit at RB4_bit
    LCD_EN as sbit at RB5_bit
    LCD_D4 as sbit at RB0_bit
    LCD_D5 as sbit at RB1_bit
    LCD_D6 as sbit at RB2_bit
    LCD_D7 as sbit at RB3_bit

    LCD_RS_Direction as sbit at TRISB4_bit
    LCD_EN_Direction as sbit at TRISB5_bit
    LCD_D4_Direction as sbit at TRISB0_bit
    LCD_D5_Direction as sbit at TRISB1_bit
    LCD_D6_Direction as sbit at TRISB2_bit
    LCD_D7_Direction as sbit at TRISB3_bit

dim keypadPort as byte at PORTD

dim kp as byte
dim ky as char
dim key as byte[20]
dim ks as string[20]
dim temp as word

sub procedure GlobInit
    TRISA = 0
    TRISB = 0
    LCD_Init
    LCD_Cmd(_LCD_CLEAR)
    LCD_Cmd(_LCD_CURSOR_OFF)
    Keypad_Init
    ADCON1 = 7
end sub

main:
     GlobInit
     for temp = 0 to 3
         kp = 0
         while (kp = 0)
               kp = Keypad_Key_Click
         wend
         select case kp
             case 1 ky = "1"
             case 2 ky = "4"
             case 3 ky = "7"
             case 4 ky = "*"
             case 5 ky = "2"
             case 6 ky = "5"
             case 7 ky = "8"
             case 8 ky = "0"
             case 9 ky = "3"
             case 10 ky = "6"
             case 11 ky = "9"
             case 12 ky = "#"
             case 13 ky = "A"
             case 14 ky = "B"
             case 15 ky = "C"
             case 16 ky = "D"
         end select
         ks[temp] = ky
         LCD_Out(1,1,ks)
     next temp
     while true
     wend
end.

Hope you notice the difference and understand it.
And also that it came to help you.
Let me know how it works.
Tahmid.

I think now

Code:

dim key as byte[20]

isnot used

and

Code:

dim ks as string[20]

what's its definition in MikroC?

Code:

char ks[10];

????

and please explain the code in words ?

sengyee1288 · Nov 8, 2010

Hi, based on schematic posted here, what will happen if i interchange the ports between LCD and Keypad? Moreover, do i need any pull up/down resistor on LCD and Keypad?

Tahmid · Nov 8, 2010

Hi toto_na16,
Although this was posted quite a few months back, I didn't see your post. But, anyway I'm not so good with mikroC as I am with mikroBASIC, but I can try and explain, if you need it now.

Hi sengyee1288,
If you change the LCD and keypad programs without changing the code, it won't function properly obviously. If you interchange the ports in code as well, then it will perform the same.
About pullup/pulldown, you don't need it here. It depends on the method of coding and using the internal functions of mikroBASIC, you don't need it.

Hope this helps.
Tahmid.

chrismicro · Nov 29, 2010

Here is some code in PICBasic you can try and convert it to microbasic
It will work with your current diagram but with an 18 pin device, I use it daily so I know it work. there is some disable code at the bottom that I use for security in case the customer don't pay me :razz:

Code:

'*******************************************************************
'*  Name    : Handheld.BAS                                           *
'*  Author  : Chris Bezuidenhout                                   *
'*  Notice  : Copyright (c) 2005 Micro Developments                *
'*          : All Rights Reserved                                  *
'*  Date    : 2005/04/13                                           *
'*  Version : 2.13                                                 *
'*  Notes   : Micro Developments is the sole owner of This Software*
'*  Device  :PIC16F628                                             *
'*******************************************************************

	INCLUDE "Modedefs.Bas"
	
' ** Setup the Crystal Frequency, in Mhz **
    DEFINE CHAR_PACING 3000 'Serout character pacing in us 
	define SER2_BITS 8
	DEFINE 	OSC		4		' Set Xtal Frequency
		' Set LCD Data port
DEFINE LCD_DREG PORTA
' Set starting Data BIT (0 OR 4) IF 4-BIT bus
DEFINE LCD_DBIT 4
' Set LCD Register Select port
DEFINE LCD_RSREG PORTA
' Set LCD Register Select BIT
DEFINE LCD_RSBIT 4
' Set LCD Enable port
DEFINE LCD_EREG PORTA
' Set LCD Enable BIT
DEFINE LCD_EBIT 7
' Set LCD bus size (4 OR 8 bits)
DEFINE LCD_BITS 4
' Set number of lines ON LCD
DEFINE LCD_LINES 4                 '********************************

DEFINE NO_CLRWDT 1 ' Don’t insert CLRWDTs

	

' ** Declare the Variables **

	K_Flag		VAR		bit
	Key			VAR		BYTE
	LKey		VAR		BYTE
	KeyVal		VAR		BYTE
	Debounce 	VAR 	BIT 	  	' Flag to indicate a keypress.
	D_Flag 		VAR 	BIT 	  	' Debounce flag used by Inkeys.
	Counter		VAR		BYTE
	Len1		VAR		BYTE
	Len2		VAR		BYTE
	Len3		VAR		BYTE
	Len4		VAR		BYTE
	X			VAR		BYTE
	Y			VAR		BYTE
	L			VAR		BYTE
    D0			VAR		BYTE
	D1			VAR		BYTE
	D2			VAR		BYTE
	D3			VAR		BYTE
	B0			VAR		BYTE       '/
	LFL			VAR     BYTE        'LINE FLAG
	FL0			VAR     LFL.BIT0    'LINE FLAG BITS
	FL1			VAR		LFL.BIT1
	FL2			VAR		LFL.BIT2
	FL3			VAR		LFL.BIT3
	L1			VAR		BYTE[20] BANK1
	L2			VAR		BYTE[20] BANK1
	L3 			VAR		BYTE[20] BANK1
	L4			VAR		BYTE[20] BANK1
'	FlagS		var		BYTE[10]
	HID			VAR		BYTE
	Q1			VAR		BYTE    
	Q2			VAR		BYTE    
  	ID			VAR		BYTE
  	Sum			VAR		WORD
    
	D_Flag=0				' Reset the debounce flag, prior to calling the subroutine
	
	OPTION_REG.7 = 0
	CMCON = 7
	
	TRISA=%00100000
	TRISB = %00001111
    low	PORTA.6
  	READ 0,Q1
	READ 1,Q2  
	READ 2,ID
	READ $78,HID
	Pause 500
	GOSUB CHECK
'	ADCON1 = 7
'	ANSEL =0
	
  Start:


		

'	LCDOut $fe, 1,"Micro Developments"
'	LCDOut $fe,$c0,"Cell.+27-72-7950107"
'	high porta.6
'	pause 5000
	 
	lcdout $fe,$0e 
	   
		
	
	
		x=0
		FOR Y=0 TO 19
		L1[Y]=" "
		L2[Y]=" "
		L3[Y]=" "
		L4[Y]=" "
		NEXT Y
Main:                                           'Main loop to select key[Q1,Q2], 200,GK,
	L=1
	Y=0
	LEN1=0
	LEN2=0
'	LEN3=0
'	LEN4=0     
		FOR Y=0 TO 19
		L1[Y]=" "
		L2[Y]=" "
'		L3[Y]=" "
'		L4[Y]=" "
		NEXT Y
		LCDOut $fe,1
Luister:   
		SERIN2 PORTA.5,16780,50,SEND,[WAIT(Q1,Q2),ID,D0,STR L1\20,D1,STR L2\20,D2]',STR L3\20,D3,STR L4\20
		gosub print
'		PAUSE 500	   
'		SerOut2 PORTA.6,16780,1,[Q1,q2,ID,"L","O"]
'		NEXT Y
'		for y = 0 to 19                             'STOOR ONTVANGDE DATA IN MEMMORY
'		write y+8,L1[Y]
'		write y+28,L2[Y]
'		write y+48,L3[Y]
'		write y+68,L1[Y]
'		NEXT Y
		
		WHILE KEY<>"#"
		GOSUB KEYSCAN
		WEND
		LCDOUT $FE,1
		gosub rmem
	    GOTO Luister  
	 
Resend:	PAUSE 200'FOR Y=1 TO 3
		SerOut2 PORTA.6,16780,1,[Q1,q2,ID,"L","R"]        'REQ. RESEND ON BAD PARITY
		'NEXT Y
		'LCDOUT $FE,$D4,"BAD PARITY"
		GOTO Luister

INCLUDE "Key16627.bas"							 	   '4x4 kEYPAD		
Print:	lcdout $FE,1
		LCDOUT $FE,$80,STR L1\20
		lcdout $fe,$C0,STR L2\20
'		lcdout $fe,$94,STR L3\20
'		lcdout $fe,$D4,STR L4\20
		return

Send:   
	    GoSub Keyscan
	    IF K_FLAG = 0 THEN Luister
	    K_FLAG=0
	    
	    LCDOUT $FE,$D4,#KEY',"L=",#L,"X=",#X,#LEN1
	    SELECT CASE KEY
	    CASE "#"
	    goto Transmit
	    CASE "*"
	    GOTO Backsp
		END SELECT
	              
		SELECT CASE L
		CASE 1 
		if x=0 then
		lcdout $fe,1
		gosub cmem
		endif
		
		L1[x]=key
		write X+8,L1[X]
		LEN1=LEN1+1
		lcdout $FE,$80,STR L1\LEN1
		CASE 2
		if x=0 then lcdout $fe,$c0 
		L2[x]=key
		write X+28,L2[X]
		LEN2=LEN2+1
		lcdout $FE,$C0,STR L2\LEN2
'		CASE 3
'		if x=0 then lcdout $fe,$94 
'		L3[x]=key
'		write X+48,L3[X]
'		LEN3=LEN3+1
'		lcdout $FE,$94,STR L3\LEN3
'		CASE 4
'		if x=0 then lcdout $fe,$d4 
'		L4[x]=key
'		write X+68,L1[X]
'		LEN4=LEN4+1
'		lcdout $FE,$D4,STR L4\LEN4
		CASE else 
		'GOTO TMODE
		END SELECT
	
		  x=x+1
		  if x=20 then
		  x=0
		  l=l+1
		  endif
		  IF X=0 AND L>2 THEN
		  X=20
		  L=2
		  ENDIF
	'	  WEND
	  GOTO Luister
Backsp:	lcdout $fe,$10
		
		x=x-1
		SELECT CASE L
		CASE 1
		LEN1=LEN1-1
		L1[LEN1]=" "
		CASE 2
		LEN2=LEN2-1
		L2[LEN2]=" "
'		CASE 3
'		LEN3=LEN3-1
'		L3[LEN3]=" "
'		CASE 4
'		LEN4=LEN4-1
'		L4[LEN4]=" "

		END SELECT
		key=0
		gosub print
	    GOTO Luister
Transmit:                           'Send caracters on display
        IF LEN1<20 THEN             'VUL DIE LYNE MET SPASIES  VOOR STUUR
        FOR Y=LEN1 TO 19
        L1[Y]=" "
        NEXT Y
        ENDIF
        IF LEN2<20 THEN
        FOR Y=LEN2 TO 19
        L2[Y]=" "
        NEXT Y
        ENDIF
'        IF LEN3<20 THEN
'        FOR Y=LEN3 TO 19
'        L3[Y]=" "
'        NEXT Y
'        ENDIF
'        IF LEN4<20 THEN
'        FOR Y=LEN4 TO 19
'        L4[Y]=" "
'        NEXT Y
'        ENDIF
'        
		 PAUSE 100
RSLoop:	LCDOUT $fe,$94,"TRANSMITING"
		for y = 1 to 10
		SerOut2 PORTA.6,16780,1,[Q1,Q2,ID,1,STR L1\20,2,STR L2\20] ',3,STR L3\20,4,STR L4\20
		PAUSE 100
		NEXT Y
		'SERIN2  PORTA.5,16780,[WAIT(Q1,Q2),ID,L,B0]         'RECIEVE RESEND B0="R" /AKN B0="O"
' 	 	PAUSE 500
'	 	NEXT Y
        
'		IF B0="R" THEN
'		LCDOUT $FE,$D4,B0
'		GOTO RSLOOP
'		ENDIF 
		 'clear line data
		X=0
		l=1
		
		'LCDOut $fe, 1               'clear display
		
		GoTo MAIN
RMEM:	
		FOR Y=8 TO 28
		READ Y,L1[Y-7]
		NEXT Y
		FOR Y=29 TO 49
		READ Y,L2[Y-7]
		NEXT Y
'		FOR Y=50 TO 70
'		READ Y,L3[Y-7]
'		NEXT Y
'		FOR Y=71 TO 91
'		READ Y,L4[Y-7]
'		NEXT Y
		Gosub print
ESub:	Return		
Cmem:   for y=8 to 88
		write y," "
		next y
		return
Return
CHECK:HID=HID+1
		   
	  FOR X = 0 TO 6
	  READ X+$79,D0
	  LOOKUP X,["C","A","B","D","4","1","7"],D1
'	  LCDOUT D0,D1
	   
	  IF D1<>D0 THEN EINDE
	  NEXT X
	  RETURN
	  		   
	  		   
EINDE:IF HID<32 THEN
	  WRITE $78,HID
	  RETURN
	  ENDIF
	  LCDOUT $fe,$94,"ENTER YOUR RELEASE CODE"
	  FOR X=$79 TO $7F
KG:	  GOSUB KEYSCAN
	  IF K_FLAG=0 THEN GOTO KG
	  K_FLAG=0
	  WRITE X,KEY
	  LCDOUT KEY
	  NEXT X
'	  PAUSE 2000
	  GOTO CHECK
	  
End
DATA @0,"C","B","B"
'DATA @$78,30

And the one include file

Code:

Keyscan:
		'FlagS[0]="C"
	Debounce=1				' Setup the initial value for Debounce
	Key=0					' Clear the variable KEY, prior to scanning
'	TRISA=%00100000
'	TRISB = %00001111
'	Option_Reg.7=0				' Enable Internal PortB Pullup Resistors	
		PORTB.4=0
		PORTB.5=1
		PORTB.6=1
		PORTB.7=1				' Pull the fourth Row line LOW
	GoSub Scancol				' Scan the columns
	IF K_Flag=1 Then GoTo Map		' If a key is pressed then map it 
		PORTB.4=1
		PORTB.5=0
		PORTB.6=1
		PORTB.7=1				' Pull the fourth Row line LOW
	GoSub Scancol				' Scan the columns
	IF K_Flag=1 Then GoTo Map		' If a key is pressed then map it 
		PORTB.4=1
		PORTB.5=1
		PORTB.6=0
		PORTB.7=1				' Pull the fourth Row line LOW
	GoSub Scancol				' Scan the columns
	IF K_Flag=1 Then GoTo Map		' If a key is pressed then map it 
		PORTB.4=1
		PORTB.5=1
		PORTB.6=1
		PORTB.7=0				' Pull the fourth Row line LOW
	GoSub Scancol				' Scan the columns
	IF K_Flag=1 Then GoTo Map		' If a key is pressed then map it 
	D_Flag=0				' No key pressed, so Reset debounce flag
	Debounce=0 			        ' No key pressed, so Reset key Debounce flag
	GoTo Exit				' Exit from the subroutine
' Do the following code if a key has been pressed
Map:	  IF D_Flag=1 Then Exit 		' Already responded to this press, so exit
	  D_Flag=1				' Set Debounce flag
	  Debounce=0 				' Reset key Debounce flag
	LookUp Key,[68,67,66,65,35,9,6,3,0,8,5,2,43,7,4,1,128],Keyval ' Map of the keypad legends for numeric output
' **To convert the output to an ascii value comment the line above and uncomment the line below
 	LookUp Key,["D","C","B","A","#","9","6","3","0","8","5","2","*","7","4","1",32],Key ' Map of the keypad legends for ascii output
' This subroutine scans the columns
' The bit, K_Flag returns a 1 if a key is pressed, and 0 if no key pressed
' Also, if no key is pressed the variable KEY will return with the value of 16
Exit:	Return
Scancol:
	K_Flag=1				' Set K_Flag initially to 1
	IF PORTB.0=0 Then DEB_release 'S_Exit		' Return if a key on the first column is pressed
	Key=Key+1				' Else increment KEY, and try another row
	IF PORTB.1=0 Then DEB_release 'S_Exit		' Return if a key on the second column is pressed
	Key=Key+1				' Else increment KEY, and try another row
	IF PORTB.2=0 Then DEB_release 'S_Exit		' Return if a key on the third column is pressed
	Key=Key+1				' Else increment KEY, and try another row
	IF PORTB.3=0 Then DEB_release 'S_Exit		' Return if a key on the fourth column is pressed
	Key=Key+1				' Else increment KEY, KEY now equals 16
	K_Flag=0				' Set the K_Flag to indicate no key pressed
S_Exit:	Return					' And exit the subroutine

DEB_release:
	'Check to see if key is released
	
	counter=256
DEB_release_l1:
	IF PORTB.0=0 Then DEB_release
	IF PORTB.1=0 Then DEB_release
	IF PORTB.2=0 Then DEB_release
	IF PORTB.3=0 Then DEB_release
	
	counter=counter-1
	IF counter=0 Then S_Exit
	
	GoTo	DEB_release_l1

chrismicro · Nov 30, 2010

Here is a kit that is designed for this software **broken link removed**

rafidragon · Dec 3, 2010

Hi ,
How many users could be added in this project , if i need more than 100 users , is it possible in this project ?

Kindly help

---------- Post added at 15:58 ---------- Previous post was at 15:37 ----------

Is it possible can u tell me how to program this in Mplab ide ? it would be very helpful for me

chrismicro · Dec 15, 2010

rafidragon said:
Hi ,
How many users could be added in this project , if i need more than 100 users , is it possible in this project ?

Kindly help

---------- Post added at 15:58 ---------- Previous post was at 15:37 ----------

Is it possible can u tell me how to program this in Mplab ide ? it would be very helpful for me

Yes it is easy, first you have to learn about 37 ASM instructions then you contact me again.

ramisaleh · May 28, 2012

Tahmid said:

Hi,
Code:

Code:

program calculator

dim LCD_RS as sbit at RB4_bit
    LCD_EN as sbit at RB5_bit
    LCD_D4 as sbit at RB0_bit
    LCD_D5 as sbit at RB1_bit
    LCD_D6 as sbit at RB2_bit
    LCD_D7 as sbit at RB3_bit

    LCD_RS_Direction as sbit at TRISB4_bit
    LCD_EN_Direction as sbit at TRISB5_bit
    LCD_D4_Direction as sbit at TRISB0_bit
    LCD_D5_Direction as sbit at TRISB1_bit
    LCD_D6_Direction as sbit at TRISB2_bit
    LCD_D7_Direction as sbit at TRISB3_bit

dim keypadPort as byte at PORTD

dim kp as byte
dim ky as byte
dim key as byte[20]
dim ks as string[20]
dim temp as word

sub procedure GlobInit
    TRISA = 0
    TRISB = 0
    LCD_Init
    LCD_Cmd(_LCD_CLEAR)
    LCD_Cmd(_LCD_CURSOR_OFF)
    Keypad_Init
    ADCON1 = 7
end sub

main:
     GlobInit
     while true
         for temp = 0 to 3
             kp = 0
             while (kp = 0)
                  kp = Keypad_Key_Click
             wend
             select case kp
                    case 1 ky = 7
                    case 2 ky = 4
                    case 3 ky = 1
                    case 4 ky = 10
                    case 5 ky = 8
                    case 6 ky = 5
                    case 7 ky = 2
                    case 8 ky = 0
                    case 9 ky = 9
                    case 10 ky = 6
                    case 11 ky = 3
                    case 12 ky = 11
                    case 13 ky = 12
                    case 14 ky = 13
                    case 15 ky = 14
                    case 16 ky = 15
             end select
             if (ky < 11) then
                key[temp] = ky
                ks[temp] = ky + 48
             end if
             if (ky > 10) then
                break
             end if
             LCD_Out(1,1,ks)
         next temp
         kp = 0
         while (kp = 0)
               kp = Keypad_Key_Click
         wend
     wend
end.

Added after 1 minutes:

Hope it helps.
Let me know how it works out for you.
Tahmid.

Added after 28 seconds:

P.S. The compiler is mikroBASIC PRO for PIC v3.20.

hi i need the same program but to display the output on 7 segment plz help

Welcome to EDAboard.com

Help with keypad+lcd using 16F877A PIC in Mikrobasic

Tahmid

Advanced Member level 6

alaalwi11

rchly

Newbie level 4

toto_na16

Member level 1

sengyee1288

Newbie level 1

Tahmid

Advanced Member level 6

chrismicro

Member level 4

chrismicro

Member level 4

rafidragon

Newbie level 2

chrismicro

Member level 4

ramisaleh

Newbie level 1

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