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adalucio
Joined: 16 Mar 2009 Posts: 29
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16f876 and lcd |
Posted: Mon May 09, 2011 12:11 pm |
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Hi all
I'm trying to use a (working) lcd (20x2) with a 16f876. I have a 20Mhz quartz.
I see only the first line with all square.
DB4 - RA2
DB5 - RA0
DB6 - RA1
DB7 - RA4
RS - RB6
RW - RA3
E - RB7
main.c
Code: |
#include <main.h>
#include "flex_lcd_16x1.c"
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
delay_ms(100);
lcd_init();
delay_ms(600);
printf(lcd_putc, "\fABCDEFGHIJKLMNOPQRST");
printf(lcd_putc, "\nabcdefghijklmnopqrst");
delay_ms(2000);
while(1)
{
output_high(PIN_B0);
delay_ms(1000);
output_low(PIN_B0);
delay_ms(1000);
printf(lcd_putc, "Test");
}
}
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main.h
Code: |
#include <16F876.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //Crystal osc <= 4mhz for PCM/PCH , 3mhz to 10 mhz for PCD
#FUSES PUT //Power Up Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection
#FUSES NOWRT //Program memory not write protected
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOPROTECT //Code not protected from reading
#use delay(clock=20000000)
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Code: |
#define LCD_DB4 PIN_A2
#define LCD_DB5 PIN_A0
#define LCD_DB6 PIN_A1
#define LCD_DB7 PIN_A4
#define LCD_RS PIN_B6
#define LCD_RW PIN_A3
#define LCD_E PIN_B7
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Thanks |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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Posted: Mon May 09, 2011 12:17 pm |
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Quote: | DB4 - RA2
DB5 - RA0
DB6 - RA1
DB7 - RA4
RS - RB6
RW - RA3
E - RB7 |
Pin A4 is open-drain on this PIC. It needs an external 4.7K pull-up
resistor on that pin, to operate as an output pin. The LCD has a pull-up
on the DB7 pin, but it's very weak. You should add the external 4.7K
pull-up to it.
Also, you're using pins B6 and B7 for the lcd. Those are the programmer
and debugger pins (for ICD2, ICD3, PicKit, ICD-U40, etc.). The lcd
won't run if the ICD is connected to the board. It's better if you use two
other pins for the lcd.
Quote: | I'm trying to use a (working) lcd (20x2) with a 16f876.
#include "flex_lcd_16x1.c" |
Also, you are using the wrong Flex driver. You have a 2-line LCD.
I think the 16x2 Flex driver would work OK for your LCD:
http://www.ccsinfo.com/forum/viewtopic.php?t=24661 |
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adalucio
Joined: 16 Mar 2009 Posts: 29
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Posted: Tue May 10, 2011 2:11 am |
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Thanks it worked
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