Newbie? Problem with LCD

**lew247** · - 7th December 2009, 12:43

Hi All,
I put myself down as a newbie even though I played with Pic's over a year ago.
The problem I have stems from I had a severe brain injury and had to undergo surgery, and since then I have had problems remembering things.

I've had to start leaning about Pic's and PBP from scratch really.

To help myself I bought an easypic 6 but decided to stick with PBP instead of Mikrobasic (had a quick look and it seemed really hard compared to PBP)

I cant figure out what I'm doing wrong,
I'm trying to get the simle "hello world" lcd test working but it just wont

My code is as follows

Code:

'****************************************************************
'*  Name    : Test.BAS                                          *
'*  Author  : Lewis                                             *
'*  Notice  :                                                   *
'*          : All Rights Reserved                               *
'*  Date    : 07/12/2009                                        *
'*  Version : 1.0                                               *
'*  Notes   :                                                   *
'*          :                                                   *
'****************************************************************
  @   DEVICE pic16F887,HS_OSC
   'LCD DEFINATION
        DEFINE OSC 8
        DEFINE LCD_DREG PORTB       ' Set LCD Data port
        DEFINE LCD_DBIT 0           ' Set starting Data bit (0) 
        DEFINE LCD_RSREG PORTB      ' Set LCD Register Select port
        DEFINE LCD_RSBIT 4          ' Set LCD Register Select bit, Port B.4
        DEFINE LCD_EREG PORTB       ' Set LCD Enable port
        DEFINE LCD_EBIT 5           ' Set LCD Enable bit, PORTB.5
        DEFINE LCD_BITS 4           ' Set LCD bus size 4 bits
        DEFINE LCD_LINES 2         ' Set number of lines on LCD to 4 Lines
        DEFINE LCD_COMMANDUS 2000   ' Set command delay time in us
        DEFINE LCD_DATAUS 50        ' Set data delay time in us

'*******************************************************************************
   pause 500       ' Wait for LCD to startup

loop:   Lcdout $fe, 1   ' Clear LCD screen
        Lcdout "Hello"  ' Display Hello
        Pause 500       ' Wait .5 second

        Lcdout $fe, 1   ' Clear LCD screen
        Lcdout "World"
        Pause 500       ' Wait .5 second

        Goto loop       ' Do it forever

I set it like that after studying the easypic manual and lcd that came with it

I use MicroCode Studio

The programmer is the picflash program that came with the easypic board, the xtal is 8Mhz

When I write the program in Microcode Studio I get a wierd effect when choosing a 16F887 PIC
the ICD Compile row of buttons goes greyed out, yet they dont when choosing a 16F877
Does this matter?

I get the following error when I compile I have no idea what it is.
Warning [207]C:P\pbp\tests\lcdtes~1.asm 108 : found label after colum 1. (DEVICE)
Error [122] c:\pbp\tests\cdtes~1.asm 108 : Illegal opcode (pic16f877)

IF I take the @ DEVICE pic16F877,HS_OSC out and put it as the first line of the program it does the same thing

If I take it out altogether it compiles ok but just won't do anything with the LCD.

I don't want anyone to write any code for me, I want and need to learn, however I'd really like someone to help please and explain what I'm doing wrong please.

I also tried changing the osc to xt but it makes no difference.

Has anyone any ideas? and sorry for asking for help for what must be to most of you a very simple problem, but I've spent 3 days trying to figure out what is wrong, as well as trying various combinations of code.

Oh Picflash v7.13
Microcode Studio ver 3.0.0.5
PBP ver I THINK it's 2.50C but not sure how to check.
Windows 7 X64

**lew247** · - 7th December 2009, 15:29

after much more reading I came up with the following, but it still doesn't do anything.
I tested the board and pic by using the blinking led program and it works, and then modified that to alternativly turn on then off each led on port B (cycle through them) and that works, so the board works fine

I just cant figure out how to get the lcd working.

Code:

define device pic16F887,HS_osc
Define OSC 8
adcon1 = 7
trisb=%00000000

'****************************************************************
'*  Name    : Test.BAS                                          *
'*  Author  : Lewis                                             *
'*  Notice  :                                                   *
'*          : All Rights Reserved                               *
'*  Date    : 07/12/2009                                        *
'*  Version : 1.0                                               *
'*  Notes   :                                                   *
'*          :                                                   *
'****************************************************************

   'LCD DEFINATION
        DEFINE LCD_DREG PORTB       ' Set LCD Data port
        DEFINE LCD_DBIT 0           ' Set starting Data bit (0) 
        DEFINE LCD_RSREG PORTB      ' Set LCD Register Select port
        DEFINE LCD_RSBIT 4          ' Set LCD Register Select bit, Port B.4
        DEFINE LCD_EREG PORTB       ' Set LCD Enable port
        DEFINE LCD_EBIT 5           ' Set LCD Enable bit, PORTB.5
        DEFINE LCD_BITS 4           ' Set LCD bus size 4 bits
        DEFINE LCD_LINES 2         ' Set number of lines on LCD to 4 Lines
        DEFINE LCD_COMMANDUS 2000   ' Set command delay time in us
        DEFINE LCD_DATAUS 50        ' Set data delay time in us

'*******************************************************************************
   pause 500       ' Wait for LCD to startup

loop:   Lcdout $fe, 1   ' Clear LCD screen
        Lcdout "Hello" ' Display Hello
        Pause 500       ' Wait .5 second

        Lcdout $fe, 1   ' Clear LCD screen
        Lcdout "World"
        Pause 500       ' Wait .5 second

        Goto loop       ' Do it forever

Anyone?

**Acetronics2** · - 7th December 2009, 15:44

Ok, lew

Seems you use MPASM as an assembler ...

so don't use PM commands !

Code:

@ __config _CONFIG1, _HS_OSC & _WDT_ON & _MCLRE_ON & _LVP_OFF & _CP_OFF

should Work somewhat better ...

Alain

**rmteo** · - 7th December 2009, 16:12

You think this MikroBASIC code is more difficult than what you came up with?

Code:

program Lcd_demo

main:

  Lcd_Init(PORTB)                    ' Initialize LCD connected to PORTB
  Delay_ms(500)

  While true

    Lcd_Cmd(LCD_CLEAR)               ' Send command to LCD "clear display"
    Lcd_Out(1,1,"Hello")               ' Print txt to LCD, 1st row, 1st column
    Delay_ms(500)

    Lcd_Cmd(LCD_CLEAR)               ' Send command to LCD "clear display"
    Lcd_Out(2,1,"World")              ' Print txt to LCD, 2nd row, 1st column
    Delay_ms(500)

  Wend

end.

**sayzer** · - 7th December 2009, 16:21

lew247,

Your problem is at PORTB config;

For 16F887, there are some registers controlling PORTB.
You have non of them configured.

If you use the LCD with PORTD, you need no setting for the port. I am sure it will work.
But I am not sure if you can switch to PORTD with your existing pcb.

------------

**Acetronics2** · - 7th December 2009, 16:43

Originally Posted by rmteo

You think this MikroBASIC code...

Hi, Rmteo

PBP also has the While - Wend loops ... LOL

Seriously ... Having tested both ... on " real " programs.

No comparison possible ... MkBasic FAR Behind ...

BTW ... If you'd want a C Pro license ... I GIVE you mine.

Not Joking at all !

Alain

**lew247** · - 7th December 2009, 17:12

Originally Posted by Acetronics

Ok, lew

Seems you use MPASM as an assembler ...

so don't use PM commands !

Code:

@ __config _CONFIG1, _HS_OSC & _WDT_ON & _MCLRE_ON & _LVP_OFF & _CP_OFF

should Work somewhat better ...

Alain

Sorry I forgot totally about that, PM would not work at all,because I have an X64 system

For some reason @ __config _CONFIG1, _HS_OSC & _WDT_ON & _MCLRE_ON & _LVP_OFF & _CP_OFF will not work

If I add it at the beginning I get Error [118] c:\pbp\tests\cdtes~1.asm 108 : Overwriting previous address contents (2007)

If I put this at the beginning of the program it compiles with no errors but won't work.

Code:

Define Device 16f887
Define OSC 8
adcon1 = 7
PORTB  = %00000000
TRISB  = %00000000 
IOCB = 0
CM1CON0 = 0
CM2CON0 = 0
CCP1CON = 0
CM2CON1 = 0
INTCON = 0

I checked the datasheet of the 16f887 (using this because it came supplied with it) and I THINK I've configured all registers on PortB

It would be good if I could change LCD pins as suggested but unfortunately not possible on this board.
And I need to learn what is wrong so next time I won't (hopefully) need to ask for help.

**Acetronics2** · - 7th December 2009, 17:43

If I add it at the beginning I get Error [118] c:\pbp\tests\cdtes~1.asm 108 : Overwriting previous address contents (2007)

Yes ...

With MPLAB you also must comment the PBP default config in the relevant .inc file ...

see details here:

http://www.picbasic.co.uk/forum/showthread.php?t=543

...

Alain

**rmteo** · - 7th December 2009, 17:54

Originally Posted by Acetronics

Hi, Rmteo

PBP also has the While - Wend loops ... LOL

Seriously ... Having tested both ... on " real " programs.

No comparison possible ... MkBasic FAR Behind ...

BTW ... If you'd want a C Pro license ... I GIVE you mine.

Not Joking at all !

Alain

Although I am not a C user, I'll take it.

**lew247** · - 7th December 2009, 18:03

Got it working at last

Thanks for all the help everyone.

I think the problem I had was I was trying to overwrite the inc files without realising.

I now have @ __config _CONFIG1, _HS_OSC & _WDT_ON & _MCLRE_ON & _LVP_OFF & _CP_OFF
as the config

However the programmer always tried to program in low voltage mode, I have to manually set it to off.

I'd like to sort that out, but I can live with it if needed.

Edit: Works with 16F877A but not 16F887 for some weird reason!

found it!

This works for the 16f887

Code:

@ __config _CONFIG1, _HS_OSC & _WDT_ON & _MCLRE_ON & _LVP_OFF & _CP_OFF
Define device 16F887
Define OSC 8
ANSEL=0  ' A/D disabled for ANS0 to ANS7
ANSELH=0 ' A/D disabled for ANS8 to ANS13
CM1CON0 = 0 ' Disable comparators
CM2CON0 = 0 ' These default to disabled at POR, but just in case
CM2CON1 = 0
adcon1 = 7
IOCB = 0
INTCON = 0
ansel = 0 
anselh = 0
PORTB  = %00000000
TRISB  = %00000000

However still got the programming issued I've got to set the low power programming to off manually and the oscillator to HS

**Acetronics2** · - 7th December 2009, 19:48

May be you should have a look to the upper part of the MPLAB Configuration bits window ...

an option to choose ...

Alain

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