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LCD Problem

 
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Ezequiel
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LCD Problem
PostPosted: Fri Jan 17, 2003 12:23 pm     Reply with quote

Hello,
I'm trying to use a Hitachi 2x16 LCD with CCS C Compiler. but I cannot see any message on the lcd (I see the black boxes that appears when the LCD Poweres Up, and I test the LCD using another compiler). My code is this:

#include <16F76.h>
#device *=16
#fuses HS,NOWDT,PUT,BROWNOUT

#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C0,rcv=PIN_C1,Invert,Stream=ECU)

#include <LCD.C>
#define TXPin PIN_C0
#define LED PIN_A0
void main() {
// Inicilizacion de Perifericos Integrados
setup_adc_ports(NO_ANALOGS);
setup_spi(FALSE);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_ccp1(CCP_OFF);
setup_ccp2(CCP_OFF);
lcd_init();

output_high (LED);
delay_ms(1000);
output_low (LED);
output_low (TXPin);
delay_ms(500);
lcd_putc ("\f");
printf (lcd_putc,"Test");
delay_ms(1500);
}

I don't see "Test" on the LCD, Why?

Thank you, Ezequiel
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This message was ported from CCS's old forum
Original Post ID: 10759
PCM programmer



Joined: 06 Sep 2003
Posts: 20399

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Re: LCD Problem
PostPosted: Fri Jan 17, 2003 3:21 pm     Reply with quote

:=Hello,
:= I'm trying to use a Hitachi 2x16 LCD with CCS C Compiler. but I cannot see any message on the lcd (I see the black boxes that appears when the LCD Poweres Up, and I test the LCD using another compiler).
---------------------------------------------------------

What is the part number of the Hitachi LCD ?

Can you give us a list of the connections between the LCD
and the PIC ? (ie., which PIC pin goes to which LCD pin ?).
___________________________
This message was ported from CCS's old forum
Original Post ID: 10763
Phil G
Guest







Re: LCD Problem
PostPosted: Fri Jan 17, 2003 3:43 pm     Reply with quote

:=Hello,
:= I'm trying to use a Hitachi 2x16 LCD with CCS C Compiler. but I cannot see any message on the lcd (I see the black boxes that appears when the LCD Poweres Up, and I test the LCD using another compiler). My code is this:
:=
:=#include <16F76.h>
:=#device *=16
:=#fuses HS,NOWDT,PUT,BROWNOUT
:=
:=#use delay(clock=20000000)
:=#use rs232(baud=9600,parity=N,xmit=PIN_C0,rcv=PIN_C1,Invert,Stream=ECU)
:=
:=#include <LCD.C>
:=#define TXPin PIN_C0
:=#define LED PIN_A0
:=void main() {
:= // Inicilizacion de Perifericos Integrados
:= setup_adc_ports(NO_ANALOGS);
:= setup_spi(FALSE);
:= setup_timer_1(T1_DISABLED);
:= setup_timer_2(T2_DISABLED,0,1);
:= setup_ccp1(CCP_OFF);
:= setup_ccp2(CCP_OFF);
:= lcd_init();
:=
:= output_high (LED);
:= delay_ms(1000);
:= output_low (LED);
:= output_low (TXPin);
:= delay_ms(500);
:= lcd_putc ("\f");
:= printf (lcd_putc,"Test");
:= delay_ms(1500);
:=}
:=
:=I don't see "Test" on the LCD, Why?
:=
:=Thank you, Ezequiel

Take a look at your printf function, as it looks like a syntax error to me. printf(lcd_putc,"\%s", "test");.
But why not simply lcd_putc("test");

Phil
___________________________
This message was ported from CCS's old forum
Original Post ID: 10764
Ezequiel
Guest







Re: LCD Problem
PostPosted: Sat Jan 18, 2003 3:50 am     Reply with quote

Hello,
I'm using the LCD.C library that is include in the Driver directory (PCM and PCB 3.094), I set the define to use PortB. So, I have LCD DataBus (DB4 - DB7)at PortB Low Nib (RB.4 to RB.7). In PortB.0 I have the Enable Pin, and in PortB.1 I have the RS Pin. The LCD is a Powertip PC1602F B, and it's working okey (I tested it with a Basic Compiler for PIC).
Thank you very much
Ezequiel
___________________________
This message was ported from CCS's old forum
Original Post ID: 10775
Ezequiel
Guest







Re: LCD Problem
PostPosted: Sat Jan 18, 2003 7:43 am     Reply with quote

Hello,
I think I discovered something but don't know how to fix it.
I connected all PortB Pins with leds. My program works okey here, I could see
some blinks at the Enable Pin (RB.0), and in the Data Pins (RB.4 to RB.7). Also
the Led at PortA.0 and the TXPin at PortC.0 also "lights". So I disconnected all
leds at portB.0 and restart the PIC. What happens here?, The program starts, light
PortA.0 Led, and stops!!!. So, a pin in PortB needs a path to ground to work, I connected
PortB.7 to ground using a 10K resistor, and my program starts working Okey. Could anybody
tell me why? If the same PIC, and the same LCD, with a different compiler works okey
without any extra component. Then I hock up the LCD (with the pull down resistor at RB.7),
and the program start working, but I couldn't see anything on the LCD.
My programmer is EPIC Win Programmer, the fuses are: No WatchDog, HS Crystal,
Brown Ou Enable, Power Up Timer Enable, Code Proctection Off. My CcS Compiler is version 3.094
Does somebody writes another driver for Hitachi LCDs or everybody use CCS driver?
If I want to write my own driver, How I can write to the entire Port, or to the high nibble at once?

Hope somebody could help me,

Thank you very much.
Ezequiel
___________________________
This message was ported from CCS's old forum
Original Post ID: 10776
Tomi
Guest







Re: LCD Problem
PostPosted: Sat Jan 18, 2003 8:33 am     Reply with quote

1. You have to use 3 control lines. You wrote about 2 lines but what is about R/W (to control the data direction: read or write) ?
2. You must connect pin3 of LCD to a small voltage dep'd on the LCD type. Try to connect it to GND.

:=Hello,
:= I think I discovered something but don't know how to fix it.
:=I connected all PortB Pins with leds. My program works okey here, I could see
:=some blinks at the Enable Pin (RB.0), and in the Data Pins (RB.4 to RB.7). Also
:=the Led at PortA.0 and the TXPin at PortC.0 also "lights". So I disconnected all
:=leds at portB.0 and restart the PIC. What happens here?, The program starts, light
:=PortA.0 Led, and stops!!!. So, a pin in PortB needs a path to ground to work, I connected
:=PortB.7 to ground using a 10K resistor, and my program starts working Okey. Could anybody
:=tell me why? If the same PIC, and the same LCD, with a different compiler works okey
:=without any extra component. Then I hock up the LCD (with the pull down resistor at RB.7),
:=and the program start working, but I couldn't see anything on the LCD.
:= My programmer is EPIC Win Programmer, the fuses are: No WatchDog, HS Crystal,
:=Brown Ou Enable, Power Up Timer Enable, Code Proctection Off. My CcS Compiler is version 3.094
:= Does somebody writes another driver for Hitachi LCDs or everybody use CCS driver?
:=If I want to write my own driver, How I can write to the entire Port, or to the high nibble at once?
:=
:= Hope somebody could help me,
:=
:=Thank you very much.
:=Ezequiel
___________________________
This message was ported from CCS's old forum
Original Post ID: 10777
Ezequiel
Guest







Re: LCD Problem
PostPosted: Sat Jan 18, 2003 10:18 am     Reply with quote

Hello,
I've the LCD R/W set with a 10k resistor to ground (Write Mode), and I have a variable resistor to control the contrast in the LCD Vo Pin.
Ezequiel
___________________________
This message was ported from CCS's old forum
Original Post ID: 10781
Tomi
Guest







Re: LCD Problem
PostPosted: Sat Jan 18, 2003 10:44 am     Reply with quote

Fault. You _must_ control the R/W bit. A byte or a nibble is written into the LCD as:
1. Set R/W to 1 (read mode) and the port to input.
2. Read D7 (the busy signal) and wait until the LCD is busy.
3. Reset R/W and write out the next byte.

In the CCS C library:
void lcd_send_byte( byte address, byte n ) {
lcd.rs = 0;
while ( bit_test(lcd_read_byte(),7) ) ; // !!!!!!!!!!
................

And the lcd_read_byte():
byte lcd_read_byte() {
byte low,high;
set_tris_lcd(LCD_READ); // !!!!!
lcd.rw = 1; // !!!!!!!
delay_cycles(1);


:=Hello,
:= I've the LCD R/W set with a 10k resistor to ground (Write Mode), and I have a variable resistor to control the contrast in the LCD Vo Pin.
:=Ezequiel
___________________________
This message was ported from CCS's old forum
Original Post ID: 10783
Ezequiel
Guest







Re: LCD Problem
PostPosted: Sat Jan 18, 2003 11:13 am     Reply with quote

Thank you very much, I was used to avoid the use of the RW line, as my Basic Compiler doesn't need it.
Ezequiel
___________________________
This message was ported from CCS's old forum
Original Post ID: 10784
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