Comments on: Interfacing LCD Modules with PIC Microcontrollers.

By: ahmad

ahmad — Sat, 19 May 2012 09:59:34 +0000

god bless u for this wonderful example and help

By: dvlee

dvlee — Wed, 25 Apr 2012 15:04:10 +0000

I have a noritake 20×4 VFD-model#: CU20045-UW5A,which I’m going to attempt to get this to work using the source code you have here. However, putting this code into MPLABv8.84 and using the HIGH TECH C Compiler,I get a host of errors. I’m wanting to eventually get a pic18f458 MCU, CP-PIC V3 to run the display.

Error [0] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 8.31 Cannot use literal values (0×0200) with __CONFIG(), use __PROG_CONFIG() instead
Error [0] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 9.31 Cannot use literal values (0X1E1F) with __CONFIG(), use __PROG_CONFIG() instead
Error [0] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 10.31 Cannot use literal values (0X8100) with __CONFIG(), use __PROG_CONFIG() instead
Error [0] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 11.31 Cannot use literal values (0X00C1) with __CONFIG(), use __PROG_CONFIG() instead
Error [0] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 12.31 Cannot use literal values (0XC00F) with __CONFIG(), use __PROG_CONFIG() instead
Error [285] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 14.1 no identifier in declaration
Warning [374] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 14.1 missing basic type; int assumed
Error [314] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 14.1 “;” expected
Warning [374] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 16.11 missing basic type; int assumed
Warning [374] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 16.17 missing basic type; int assumed
Error [314] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 16.17 “;” expected
Error [285] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 18.1 no identifier in declaration
Warning [374] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 18.1 missing basic type; int assumed
Error [314] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 18.1 “;” expected
Warning [361] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 23.1 function declared implicit int
Warning [361] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 26.1 function declared implicit int
Error [192] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 26.9 undefined identifier “LS_BLINK”
Warning [361] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 29.1 function declared implicit int
Warning [361] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 32.1 function declared implicit int
Warning [361] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 43.1 function declared implicit int
Warning [361] H:\EVERYTHING!!! 2376\ 5-LCD htc extrm electrns 04-25-12.c; 50.1 function declared implicit int

********** Build failed! **********

By: Dhaka

Dhaka — Sat, 21 Apr 2012 06:48:15 +0000

Hi Avinash,

I am new to embedded programming and got benefited a lot from your tutorials. My sincere thanks to you. I have one doubt about below lines your program,
//Chip Settings
__CONFIG(1,0×0200);
__CONFIG(2,0X1E1F);
__CONFIG(3,0X8100);
__CONFIG(4,0X00C1);
__CONFIG(5,0XC00F);

Could you kindly explain purpose of these settings? And also could you kindly explain how to calculate these settings for other 18FXXXX PIC micro-controllers?

Thanks in advance.

By: Ming

Ming — Wed, 18 Apr 2012 15:55:31 +0000

Hi,

I like to know if i wanted to display decimal integer on the LCD. what should i do?

By: rosh_007

rosh_007 — Mon, 16 Apr 2012 19:19:16 +0000

i amnewbie to pic and have a doubt..wat all changes will be required to program a pic18f4550 using mplab and mplab c-lite compiler..?plz help

By: Avinash

Avinash — Tue, 13 Mar 2012 04:01:30 +0000

@Akhil

“can u please send me the code for lcd interfacing for pic 18f452..am using mplab with c18 compiler”

I don’t get you! Why would I send anything to someone I don’t know ?

By: akhil

akhil — Mon, 12 Mar 2012 05:51:31 +0000

can u please send me the code for lcd interfacing for pic 18f452..am using mplab with c18 compiler

By: stuful9

stuful9 — Sat, 10 Mar 2012 09:02:53 +0000

can anyone suggest good programmer for pic16f877a

By: deno

deno — Fri, 24 Feb 2012 15:04:21 +0000

can you please temme will this circuit will workout for an LCD display to get connected with an microcontroler…. please help me out

By: Embiale

Embiale — Mon, 30 Jan 2012 09:31:46 +0000

Hi the lcd hex file works. but when i tried to compile the lcd_test.h file, the compiler says “extended cpu mode is enabled,the compiled file doesn’t work”.how can i configure mplab ide hitech so that it can work? am waiting ur help. thank u.

By: jason

jason — Sat, 28 Jan 2012 16:49:33 +0000

hi
from the program that is given,which part i need to change if I use the pic16f877a?

By: Muhammad

Muhammad — Mon, 23 Jan 2012 08:48:19 +0000

Dear how can i use this code in MPLAB C30.
for dsPIC33F

By: Alpha

Alpha — Tue, 17 Jan 2012 03:16:32 +0000

Okay, thank you so much, Avinash!

By: Avinash

Avinash — Tue, 17 Jan 2012 03:14:03 +0000

@Alpha,

If we don’t read the LCD how we know when it busy or free? We cannot send command when its busy!

If you use fixed resistor how will you adjust the contrast. In worst case without proper contrast you cannot see any thing on LCD.

By: Alpha

Alpha — Mon, 16 Jan 2012 13:38:25 +0000

Hi, I would like to ask if it is possible to tie the R/W pin to GND(Logic 0) as i will only be writing to the LCD and not going to read from it, and also a fixed resistor at 10k Ohms instead of a variable resistor?

By: sam

sam — Sat, 31 Dec 2011 18:02:51 +0000

I want to interfacing LCD with PIC16F628A using Hi Tech C. Where I can get the library files?

By: Avinash

Avinash — Thu, 29 Dec 2011 03:47:09 +0000

notice the difference between

including of htc.h and lcd.h

By: Avinash

Avinash — Thu, 29 Dec 2011 03:39:04 +0000

@Eric

See this
http://gcc.gnu.org/onlinedocs/cpp/Include-Syntax.html

You should notice that in my program I have writtem


#include "lcd.h"

this syntax searches lcd.h in the same directory first where the source file contain the #include directive.

I request all users to jump into Embedded system only after knowing C very well, or be confused over the basic at every line.

By: Eric

Eric — Thu, 29 Dec 2011 02:04:21 +0000

Here is a very basic question. This LCD example contains a header file named lcd.h Hi Tech C also has a lcd.h file. How does the compiler know to use the included lcd.h or the one that is part of Hi Tech C?

By: Rakesh

Rakesh — Tue, 06 Dec 2011 21:54:22 +0000

IF i am not wrong then if i have to PIC18f4550 inspite of PCI18f4520 then all I have to do is to set config according to PIC18f4550 …
am i right?

Please provide the config bytes for pic18f4550 the CONFIG of pic18f4550 is in the from something like

;Configuration bits
CONFIG OSC = HS
CONFIG FCMENB = OFF
CONFIG IESOB = OFF
CONFIG PWRT = ON
CONFIG BOR = BOACTIVE
CONFIG BORV = 27
CONFIG WDT = OFF
CONFIG WDTPS = 128
CONFIG MCLRE = ON
CONFIG LPT1OSC = OFF
CONFIG PBADEN = OFF
CONFIG DEBUG = OFF
CONFIG XINST = OFF
CONFIG BBSIZ = 1024
CONFIG LVP = OFF
CONFIG STVREN = OFF
CONFIG CP0 = OFF etc etc

But in your code it is some other. I couldn’t find and understand much of datasheet for pic18f4550.

Please provide chip setting with a short desc

Thanks