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LCD on PICDEM 2 PLUS with PIC16Fxx

 
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snwbnd



Joined: 28 Apr 2009
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LCD on PICDEM 2 PLUS with PIC16Fxx
PostPosted: Wed Apr 29, 2009 1:27 am     Reply with quote
Hello,

I'm using a PIC16Fxx Device and the PICDEM 2 Plus Board. Im tried to use the flex_lcd.c Code with some modification to use the LCD.

I'm using the 18-Pin Socket, which has no connection to the lcd. Because of that I connect it with cables over the other two sockets:
Code:
28-PIN-Socket        40-PIN-Socket
------------------------------------------------
21 -> 19
22 -> 20
23 -> 21
24 -> 22
25 -> 27
26 -> 28
27 -> 29
28 -> 30



In the flex_lcd I've corrected the beginning part with port declaration:
Code:
// These pins are for the Microchip PicDem2-Plus board,
// which is what I used to test the driver.  Change these
// pins to fit your own board.

#define LCD_DB4   PIN_B0
#define LCD_DB5   PIN_B1
#define LCD_DB6   PIN_B2
#define LCD_DB7   PIN_B3

#define LCD_E     PIN_B6
#define LCD_RS    PIN_B5
#define LCD_RW    PIN_B4

// If you only want a 6-pin interface to your LCD, then
// connect the R/W pin on the LCD to ground, and comment
// out the following line.

// #define USE_LCD_RW   1     


No I hopped this should work with the following code in the main.c:

Code:
   output_high(LCD_POWER);  // Turn on power to LCD
   output_low(LCD_RW);      // Set R/W pin on LCD to a low level
   lcd_init();  // Always call this first.

   lcd_putc("\fHello World\n");
   lcd_putc("Line Number 2");




What's wrong? Can somebody help or have somebody also tried to use a PIC16 Device with the LCD?
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Wed Apr 29, 2009 11:01 am     Reply with quote
First, I need to know which version PicDem2-Plus you have.

The new Rohs version looks like this. It has silver pads in the bottom of
the prototyping area on the right side of the board:
http://www.microchipdirect.com/ProductSearch.aspx?Keywords=DM163022

The older non-Rohs version doesn't have that. It looks like this:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en010072

Which board do you have ?
snwbnd



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Posts: 6

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PostPosted: Wed Apr 29, 2009 11:07 am     Reply with quote
I have the new Rohs Version from 2006!

Since i've wrote the thread, I've changed some pins. I saw that RB6 and 7 are used for Debugging and RB0 is connected to S3.

RA1...RA3 -> RS, R/W and E
RB1...RB4 -> DB4...DB7
RB5 -> VCC Transistor to activate the Display

This connections are made and tested on the hardware


in the flex_lcd I've wrote this:
Code:
#define LCD_DB4   PIN_B1
#define LCD_DB5   PIN_B2
#define LCD_DB6   PIN_B3
#define LCD_DB7   PIN_B4

#define LCD_E     PIN_A3
#define LCD_RS    PIN_A1
#define LCD_RW    PIN_A2

// If you only want a 6-pin interface to your LCD, then
// connect the R/W pin on the LCD to ground, and comment
// out the following line.

// #define USE_LCD_RW   1 


In main.c I've added this:

Code:
#define LCD_POWER  PIN_B5
output_high(LCD_POWER);  // Turn on power to LCD
   output_low(LCD_RW);      // Set R/W pin on LCD to a low level
PCM programmer



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PostPosted: Wed Apr 29, 2009 11:13 am     Reply with quote
Post your PIC and your compiler version.
snwbnd



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Posts: 6

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PostPosted: Thu Apr 30, 2009 2:11 am     Reply with quote
CCS Version 4.057
MPLAB Version 8.00
PIC16F87
PCM programmer



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Posts: 21708

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PostPosted: Thu Apr 30, 2009 12:12 pm     Reply with quote
You jumpered Port B to Port D on a 1:1 basis. The LCD uses pins
on Port D only. The connections are shown in the schematic in the
back of the PicDem2-Plus User's Guide. So to create the new #define
statements, you simply have to edit the table shown in this post
http://www.ccsinfo.com/forum/viewtopic.php?t=24661&start=51
and change PIN_Dx into PIN_Bx. Also, the #define for the power pin
should be changed in the same way. Do it like this:
Code:

#define LCD_DB4   PIN_B0
#define LCD_DB5   PIN_B1
#define LCD_DB6   PIN_B2
#define LCD_DB7   PIN_B3

#define LCD_E     PIN_B6
#define LCD_RS    PIN_B4
#define LCD_RW    PIN_B5

// If you only want a 6-pin interface to your LCD, then
// connect the R/W pin on the LCD to ground, and comment
// out the following line.

// #define USE_LCD_RW   1 

#define LCD_POWER  PIN_B7

If you copy this code exactly, it should work. But to be safe, remove
jumper J6. There are 4 LEDs on pin B0 to B3. It's possible that these
might interfere with the LCD operation if they are connected. If you
remove jumper J6, they will be disabled.
snwbnd



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PostPosted: Thu Apr 30, 2009 12:24 pm     Reply with quote
No, I jumpered it like this:
RA1...RA3 -> RS, R/W and E
RB1...RB4 -> DB4...DB7
RB5 -> VCC Transistor to activate the Display

I removed J6 and I don't want to usw RB0 because of the connection to the RB0 Button and RB6&7 because they are used for the Debugger....
I've changed the code like my post before:
Code:
#define LCD_DB4   PIN_B1
#define LCD_DB5   PIN_B2
#define LCD_DB6   PIN_B3
#define LCD_DB7   PIN_B4

#define LCD_E     PIN_A3
#define LCD_RS    PIN_A1
#define LCD_RW    PIN_A2


Also the Power Pin is changed!
PCM programmer



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PostPosted: Thu Apr 30, 2009 12:30 pm     Reply with quote
So you changed the jumpers ? Here is your previous list of jumpers.
Quote:
28-PIN-Socket 40-PIN-Socket
------------------------------------------------
21 -> 19
22 -> 20
23 -> 21
24 -> 22
25 -> 27
26 -> 28
27 -> 29
28 -> 30

Apparently this is no longer in effect.

Post the exact list of pin-to-pin jumpers (not names) that you currently have.
snwbnd



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PostPosted: Thu Apr 30, 2009 12:36 pm     Reply with quote
At the moment, I've released the connections to test the lcd with a 40pin device, which is working perfectly by the way.

I've always made the connections from the 40pin to the 28pin socket and after I've tested them with a multimeter. Directly measured from my 16f87 and the LCD Connections.

Did you ever used the lcd on the picdem 2 with a 18pin PIC device?
PCM programmer



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PostPosted: Thu Apr 30, 2009 12:38 pm     Reply with quote
No.
snwbnd



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PostPosted: Thu Apr 30, 2009 12:43 pm     Reply with quote
So I test it tomorrow again, the connections are correct...
Do you think it should work like I said here:
Quote:
No, I jumpered it like this:
RA1...RA3 -> RS, R/W and E
RB1...RB4 -> DB4...DB7
RB5 -> VCC Transistor to activate the Display

I removed J6 and I don't want to usw RB0 because of the connection to the RB0 Button and RB6&7 because they are used for the Debugger....
I've changed the code like my post before:
Code:

#define LCD_DB4   PIN_B1
#define LCD_DB5   PIN_B2
#define LCD_DB6   PIN_B3
#define LCD_DB7   PIN_B4

#define LCD_E     PIN_A3
#define LCD_RS    PIN_A1
#define LCD_RW    PIN_A2


Also the Power Pin is changed!
PCM programmer



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PostPosted: Thu Apr 30, 2009 12:52 pm     Reply with quote
It will probably work, provided that it's jumpered correctly.
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