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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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| Help PIC 16F876 And LCD 16X2 |
 Posted: Sun Feb 27, 2011 12:09 pm |
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Hi i'm trying to write a program, very simple program:
| Code: |
#include <16F876A.h>
#include <lcd.c>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES
#use delay(clock=20000000)
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(VREF_LOW|-2);
lcd_init();
delay_ms(5); // <----- delays
lcd_putc("\f"); //Clear display
delay_ms(5);
lcd_gotoxy(1,1);
delay_ms(5);
lcd_putc("Champ"); // you want to send this to the lcd only once
while(TRUE)
{
// LCD Display //
delay_ms(1000);
}
while(1)
printf(lcd_putc, "\f Testing LCD ");
}
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And when i Compile the program, it give me Error in Source File, LCD.C
1 Errors, 0 Warnings.
| Code: | | Error[12] C:\Program Files\PICC\drivers\lcd.c 106 : Undefined identifier -- set_tris_lcd |
Can anyone give me a help? |
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temtronic
Joined: 01 Jul 2010
Posts: 9226
Location: Greensville,Ontario
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| Posted: Mon Feb 28, 2011 8:48 am |
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| You may have a bad lcd.c file as there is no set_lcd_tris in my copy of lcd.c |
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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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| Posted: Mon Feb 28, 2011 9:48 am |
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That's what i think...
I already change the LCD source file, to "LCD420.c" that was at PICC too, and I resolve it...
Thanks.... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Feb 28, 2011 1:23 pm |
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| Quote: | You may have a bad lcd.c file as there is no set_lcd_tris in my copy of lcd.c
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It's in lcd.c in vs. 4.119. The Examine32 text search program gives
these results:
| Quote: |
c:\program files\picc\drivers\lcd.c
#define set_tris_lcd(x) set_tris_b(x)
set_tris_lcd(LCD_INPUT_MAP);
set_tris_lcd(LCD_OUTPUT_MAP);
set_tris_lcd(LCD_OUTPUT_MAP);
set_tris_lcd(LCD_OUTPUT_MAP);
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| Quote: |
I already change the LCD source file, to "LCD420.c" that was at PICC too, and I resolve it...
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It may work, but the lcd.c driver is the best one to use for a 16x2 LCD.
| Quote: | | when i Compile the program, it give me Error in Source File, LCD.C |
You forgot to put in the #include line for lcd.c. You need to add the line
shown in bold below:
| Quote: |
#include <16F876A.h>
#include <lcd.c>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES
#use delay(clock=20000000)
#include <lcd.c>
void main()
{ |
Also you are missing your oscillator fuse. I suspect this is a Proteus project. |
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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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| Posted: Mon Feb 28, 2011 4:40 pm |
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This is my "LCD.C"
| Code: |
///////////////////////////////////////////////////////////////////////////
//// LCDD.C ////
//// Driver for common LCD modules ////
//// ////
//// lcd_init() Must be called before any other function. ////
//// ////
//// lcd_putc(c) Will display c on the next position of the LCD. ////
//// The following have special meaning: ////
//// \f Clear display ////
//// \n Go to start of second line ////
//// \b Move back one position ////
//// ////
//// lcd_gotoxy(x,y) Set write position on LCD (upper left is 1,1) ////
//// ////
//// lcd_getc(x,y) Returns character at position x,y on LCD ////
//// ////
///////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS C ////
//// compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, reproduction ////
//// or distribution is permitted without written permission. ////
//// Derivative programs created using this software in object code ////
//// form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////
// As defined in the following structure the pin connection is as follows:
// D0 enable
// D1 rs
// D2 rw
// D4 D4
// D5 D5
// D6 D6
// D7 D7
//
// LCD pins D0-D3 are not used and PIC D3 is not used.
// Un-comment the following define to use port B
// #define use_portb_lcd TRUE
struct lcd_pin_map { // This structure is overlayed
BOOLEAN enable; // on to an I/O port to gain
BOOLEAN rs; // access to the LCD pins.
BOOLEAN rw; // The bits are allocated from
BOOLEAN unused; // low order up. ENABLE will
int data : 4; // be pin B0.
} lcd;
#if defined(__PCH__)
#if defined use_portb_lcd
#byte lcd = 0xF81 // This puts the entire structure
#else
#byte lcd = 0xF83 // This puts the entire structure
#endif
#else
#if defined use_portb_lcd
#byte lcd = 6 // on to port B (at address 6)
#else
#byte lcd = 8 // on to port D (at address 8)
#endif
#endif
#if defined use_portb_lcd
#define set_tris_lcd(x) set_tris_b(x)
//#else
// #define set_tris_lcd(x) set_tris_d(x) Configurar as portas para o LCD, Alterado por Tony a 27-02-2011
#endif
#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40 // LCD RAM address for the second line
BYTE const LCD_INIT_STRING[4] = {0x20 | (lcd_type << 2), 0xc, 1, 6};
// These bytes need to be sent to the LCD
// to start it up.
// The following are used for setting
// the I/O port direction register.
struct lcd_pin_map const LCD_WRITE = {0,0,0,0,0}; // For write mode all pins are out
struct lcd_pin_map const LCD_READ = {0,0,0,0,15}; // For read mode data pins are in
BYTE lcd_read_byte() {
BYTE low,high;
set_tris_lcd(LCD_READ);
lcd.rw = 1;
delay_cycles(1);
lcd.enable = 1;
delay_cycles(1);
high = lcd.data;
lcd.enable = 0;
delay_cycles(1);
lcd.enable = 1;
delay_us(1);
low = lcd.data;
lcd.enable = 0;
set_tris_lcd(LCD_WRITE);
return( (high<<4) | low);
}
void lcd_send_nibble( BYTE n ) {
lcd.data = n;
delay_cycles(1);
lcd.enable = 1;
delay_us(2);
lcd.enable = 0;
}
void lcd_send_byte( BYTE address, BYTE n ) {
lcd.rs = 0;
while ( bit_test(lcd_read_byte(),7) ) ;
lcd.rs = address;
delay_cycles(1);
lcd.rw = 0;
delay_cycles(1);
lcd.enable = 0;
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0xf);
}
void lcd_init() {
BYTE i;
set_tris_lcd(LCD_WRITE);
lcd.rs = 0;
lcd.rw = 0;
lcd.enable = 0;
delay_ms(15);
for(i=1;i<=3;++i) {
lcd_send_nibble(3);
delay_ms(5);
}
lcd_send_nibble(2);
for(i=0;i<=3;++i)
lcd_send_byte(0,LCD_INIT_STRING[i]);
}
void lcd_gotoxy( BYTE x, BYTE y) {
BYTE address;
if(y!=1)
address=lcd_line_two;
else
address=0;
address+=x-1;
lcd_send_byte(0,0x80|address);
}
void lcd_putc( char c) {
switch (c) {
case '\f' : lcd_send_byte(0,1);
delay_ms(2);
break;
case '\n' : lcd_gotoxy(1,2); break;
case '\b' : lcd_send_byte(0,0x10); break;
default : lcd_send_byte(1,c); break;
}
}
char lcd_getc( BYTE x, BYTE y) {
char value;
lcd_gotoxy(x,y);
while ( bit_test(lcd_read_byte(),7) ); // wait until busy flag is low
lcd.rs=1;
value = lcd_read_byte();
lcd.rs=0;
return(value);
}
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I'm not finding the problem, the message:
| Code: |
Error[12] C:\Program Files\PICC\drivers\lcd.c 93 : Undefined identifier -- set_tris_lcd |
[/code] |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Feb 28, 2011 4:44 pm |
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What port on the PIC is the LCD connected to ? Is it Port D, or Port B ?
Post a list of the connections between the LCD pins and the PIC pins.
Or post your Proteus schematic on a free image hosting service, and
then post a link to it. |
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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Feb 28, 2011 5:54 pm |
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I didn't notice that you had lcd.c included just below the PIC include line.
It's better if you put it in the location that I show below. But anyway, to
use PortB, you need to add the #define statement for 'use_portb_lcd' just
above the #include line for lcd.c, as shown below in bold:
| Quote: |
#include <16F876A.h>
#device adc=8
#FUSES HS, NOWDT
#use delay(clock=20000000)
#define use_portb_lcd TRUE
#include <lcd.c>
void main()
{ |
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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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| Posted: Mon Feb 28, 2011 6:17 pm |
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| Thanks, it's working with this last help... |
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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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| Posted: Fri Apr 22, 2011 4:09 pm |
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hi again.... i'm trying to test the program but the display seems to be dead. don't give me one sign of working....
in proteus, it works....
DISPLAYTECH 162B
LCD connections:
pin 1 -- Resistor---- +5v
pin 2 -- GND
pin 3 -- GND
pin 4 -- 5V
pin 5 -- 5V
pin 6 -- RB1
pin 7 -- RB2
pin 8 -- RB0
pin 9 -- NC
pin 10 NC
pin 11-- NC
pin 12 --NC
pin 13 RB4
pin 14 RB5
pin 15 RB6
pin 16 RB7
can you confirm if that's all ok?
this is my code:
| Code: |
#include <16F876A.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#use delay(clock=20000000)
#define use_portb_lcd TRUE
#include <lcd.c>
// Variaveis de Apoio
int a;
int b;
int c;
// Guarda Valor do ADC
float valor;
void main()
{
lcd_init();
set_adc_channel(0);
setup_adc( ADC_CLOCK_INTERNAL );
setup_port_a(ALL_ANALOG); // se port a to all analoges
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(VREF_LOW|-2);
set_tris_c (0b1111111); //0 - inputs | 1 - outputs
// Inicialização do Display
//lcd_init();
delay_ms(50); // <----- delays
lcd_putc("\f "); //Clear display
delay_ms(50);
lcd_gotoxy(1,1);
delay_ms(50);
a=0;
// Publicidade
lcd_gotoxy(0,0);
lcd_putc( "\f E. Rosmaninho");
lcd_putc("\n Versao V0.1");
delay_ms(50);
lcd_gotoxy(1,0);
lcd_putc("\b Date 01/03/2011");
delay_ms(50);
lcd_gotoxy(1,0);
lcd_putc("\b Programmer: Tony ");
delay_ms(50);
valor=0;
while (1) {
// 1ª Leitura
delay_ms( 50 );// SCAN TIME PAUSe, desactivado para ser mais rápido na simulação
lcd_putc( "\f");
valor = read_adc();
valor= (2/10.24)*valor;
// Termoestato Electrónico
If (valor < 23 )
{
output_high(pin_C0); // Liga Aquecimento
b=1; // Variável auxiliar aquecimento
c=0; // Variável auxiliar alarme
lcd_gotoxy(1,1);
printf(lcd_putc,"Set Point: 25 C");
lcd_gotoxy(1,2);
printf(lcd_putc,"\nTemp: %.1fC\n", valor);
delay_ms(100);}
If (valor > 23 && valor < 27 && b==1 ) // A Aguardar que atinja a temperatura de desligar
{
lcd_gotoxy(1,1);
printf(lcd_putc,"Set Point: 25 C");
lcd_gotoxy(1,2);
printf(lcd_putc,"\n Temp: %.1fC", valor);
c=0;
delay_ms(100);
}
If (valor > 23 && valor < 27 && b==0 ) // Em espera para voltar a ligar
{
lcd_gotoxy(1,1);
printf(lcd_putc,"Set Point: 25 C");
lcd_gotoxy(1,2);
printf(lcd_putc,"\nTemp: %.1fC\n", valor);
output_low(pin_C1);
c=0;
delay_ms(100);} // Desliga o alarme
If (valor > 27 && valor <40 && c==0) // Desliga o aquecimento
{output_low(pin_C0);
b=0;
lcd_gotoxy(1,1);
printf(lcd_putc,"Set Point: 25 C");
lcd_gotoxy(1,2);
printf(lcd_putc,"\nTemp: %.1fC\n", valor);
delay_ms(100);}
If (valor > 27 && valor <40 && c==1) // Vem de uma situação de alarme
{output_low(pin_C0);
b=0;
lcd_gotoxy(1,1);
printf(lcd_putc, " !! ALARME !! ");
lcd_gotoxy(1,2);
printf(lcd_putc,"\nTemp: %.1fC\n", valor);
delay_ms(100);}
while (valor > 40 ) // situação de alarme
{
valor = read_adc();
valor= (2/10.24)*valor;
output_low(pin_C0);
output_high(pin_C1);
b=0;
c=1;
lcd_gotoxy(1,1);
printf(lcd_putc, " !! ALARME !! ");
lcd_gotoxy(1,2);
printf(lcd_putc,"\nTemp: %.1fC", valor);
delay_ms(10);};
}
}
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in theory works... in the practice no :( is possible LCD burned?
regards |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Apr 22, 2011 4:21 pm |
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| Quote: | | in proteus, it works.... |
Proteus doesn't care about a lot of things that are important in real hardware.
Where is your oscillator fuse ? HS is needed.
The coordinates origin for the lcd.c driver is (1,1).
This is stated, right in the instructions at top of the driver file. Example:
| Quote: | | //// lcd_gotoxy(x,y) Set write position on LCD (upper left is 1,1) |
| Code: | pin 1 -- Resistor---- +5v
pin 2 -- GND
pin 3 -- GND
pin 4 -- 5V
pin 5 -- 5V
pin 6 -- RB1
pin 7 -- RB2
pin 8 -- RB0
pin 9 -- NC
pin 10 NC
pin 11-- NC
pin 12 --NC
pin 13 RB4
pin 14 RB5
pin 15 RB6
pin 16 RB7 |
There are at least two different pinouts for the 162B LCD.
In this one, pins A and K are on pins 15 and 16:
http://www.displaytech-us.com/pdf/FullSpecs/S162B-v11.pdf
In this one, they are on pins 1 and 2:
http://www.astlab.hu/pdfs/162b-series-lcd.pdf
Which one is correct ?
My advice is, get a different brand of LCD than DisplayTech. Get one
that has consistent documentation, where the pinouts are always the same.
Also I just noticed that you're using PortB, but you didn't do the changes
that I said in a previous post. Same with the HS fuse. So I guess I'm done with this. |
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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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| Posted: Fri Apr 22, 2011 4:33 pm |
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| i'm using the second one, the backlight switch in pin1 and 2 |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Apr 22, 2011 4:42 pm |
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You have the Vo pin connected to +5v. That's the LCD contrast pin.
According to the data sheet, it should be set to approximately .2 to .5 volts.
If you set it to +5v, the LCD won't display properly.
| Quote: |
pin 1 -- Resistor---- +5v
pin 2 -- GND
pin 3 -- GND
pin 4 -- 5V
pin 5 -- 5V
pin 6 -- RB1
pin 7 -- RB2
pin 8 -- RB0
pin 9 -- NC
pin 10 NC
pin 11-- NC
pin 12 --NC
pin 13 RB4
pin 14 RB5
pin 15 RB6
pin 16 RB7
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Also, if you have an ICD programmer connected to the board, the LCD
won't work. The ICD uses pins B6 and B7. |
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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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| Posted: Fri Apr 22, 2011 5:04 pm |
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Sorry, what's a ICD programmer?
the PIN 5 I connect to GND, and the display already show anything....
its all ON |
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Rosmaninho
Joined: 16 Jan 2011
Posts: 23
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