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pokiko
Joined: 27 Jul 2007
Posts: 33
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| could't write to LCD |
 Posted: Wed Jan 16, 2008 8:48 am |
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Hi to all and thanks for such a great forum. I wrote the below code, but i couldn't able to write it to LCD. The problem may be with the code. I used the Flex_LCD at this forum. Can anyone tell me about the problem please?
PIN configurations of LCD.
#define LCD_DB4 PIN_C4
#define LCD_DB5 PIN_C5
#define LCD_DB6 PIN_C6
#define LCD_DB7 PIN_C7
#define LCD_E PIN_C3
#define LCD_RS PIN_C0
//#define LCD_RW PIN_A2
//#define USE_LCD_RW 1
LCd is an h44780 compatible. Pin3 is connected to +5v over 10k and to GND over 330 ohm. R/W is connected to GND. LCD gets power but i can't see anything.
| Code: |
#include <18F2520.h>
#device adc=10
#fuses HS,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=20000000)
//#include <stdio.h>
#include "flex_LCD.c"
#use fast_io(a)
#use fast_io(b)
//#use fast_io(c)
#define BUTON_UP !input(PIN_B4)
#define BUTON_DOWN !input(PIN_B5)
#define BUTON_ENTER !input(PIN_B6)
#define BUTON_BREAK !input(PIN_B7)
#define MIN_AMPER 1
#define MAX_AMPER 49
#define MIN_VOLTAGE 0
#define MAX_VOLTAGE 30
#define MIN_CCP_1 12000
#define MAX_CCP_1 24500
#define MIN_CCP_2 37000
#define MAX_CCP_2 49500
......
//some code in here
unsigned int akim=0;
unsigned int gerilim=0;
unsigned int16 ADC_TO_BE;
unsigned int16 Total_ADC_I;
unsigned int16 Total_ADC_V;
unsigned int16 READED_I;
unsigned int16 READED_V;
void init_MCU();
unsigned int16 ADC_Compute_I(unsigned int16);
unsigned int16 ADC_Compute_V(unsigned int16);
void main(){
int modeSelect=0;
init_MCU();
printf(lcd_putc,"\f UP-Akım modu\n");
printf(lcd_putc,"\f DOWN-Gerilim modu");
if(BUTON_UP){
modeSelect=1;//AKIM MODU
delay_ms(20);
}
if(BUTON_DOWN){
modeSelect=2; //GERİLİM MODU
delay_ms(20);
}
if(modeSelect!=0){
if(modeSelect==1){
set_adc_channel(0);
delay_us(20);
ccp_1=65535; //ensures that no false CCP interrupt occurs!
ccp_2=65535;
set_timer1(0);
set_timer3(0);
enable_interrupts( GLOBAL );
while(1){
printf(lcd_putc,"\fI_set=%d\n",akim);
if (BUTON_UP){
akim++;
delay_ms(20);
if(akim>MAX_AMPER){
akim=50;
}
}
if(BUTON_DOWN){
akim--;
delay_ms(20);
if(akim<MIN_AMPER){
akim=0;
}
}
Total_ADC_I=ADC_Compute_I(akim);
READED_I=read_adc();
if (READED_I>Total_ADC_I){
CCP_1++;
CCP_2=CCP_1+25000;
if(CCP_1>MAX_CCP_1)
CCP_1=MAX_CCP_1;
CCP_2=CCP_1+25000;
if (READED_I<Total_ADC_I){
CCP_1--;
CCP_2=CCP_1+25000;
if(CCP_1<MIN_CCP_1)
CCP_1=MIN_CCP_1;
CCP_2=CCP_1+25000;
}
}
}
}
if(modeSelect==2){
//........
//some code in here
}
}}
unsigned int16 ADC_Compute_I(unsigned int16 ampere)
{
unsigned int16 kademe;
kademe=(unsigned int16)(ampere*18,618181818);
return kademe;
}
void init_MCU(){
setup_spi(SPI_SS_DISABLED);
ext_int_edge(L_TO_H);
output_low( PIN_A5 );
setup_ccp1( CCP_COMPARE_INT );
setup_CCP2( CCP_COMPARE_INT );
enable_interrupts( INT_EXT );
enable_interrupts( INT_CCP1 );
enable_interrupts( INT_CCP2 );
enable_interrupts( RTCC_OFF );
setup_timer_1( T1_INTERNAL |T1_DIV_BY_2 );/
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3 (T3_INTERNAL | T3_DIV_BY_2);
setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
set_tris_a(0b00011001);
set_tris_b(0b11110001);
delay_ms(20);
lcd_init();
delay_ms(1500);
ccp_1=65535;
ccp_2=65535;
set_timer1(0);
set_timer3(0);
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jan 16, 2008 12:37 pm |
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Your test program is too complicated. Try this program instead:
| Code: |
#include <18F2520.H>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 20000000)
#include "flex_lcd.c"
//==========================
void main()
{
lcd_init();
lcd_putc("\fHello World\n");
lcd_putc("Line Number 2");
while(1);
} |
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pokiko
Joined: 27 Jul 2007
Posts: 33
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| Posted: Thu Jan 17, 2008 9:51 am |
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I tried the code above. Still there is no change. Some data goes to LCD when i look with a scope, but I can't see even black squares. Already nothing.
could there be a problem with port c?  |
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Ramyses
Guest
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| Posted: Fri Jan 18, 2008 5:43 pm |
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| pokiko wrote: | I tried the code above. Still there is no change. Some data goes to LCD when i look with a scope, but I can't see even black squares. Already nothing.
could there be a problem with port c? |
O problema pode ser a falta de delays na bliblioteca flex_LCD. Eu tinha esse mesmo problema, mas inseri alguns delays na biblioteca e resolveu.
Os sinais são muito rápidos para o LCD entender, por isso os delays
SDS
Translation:
The problem can be the lack of delays in the library flex_LCD. I had this exactly problem, but I inserted some delays in the code and fixed it. |
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Franck26
Joined: 29 Dec 2007
Posts: 122
Location: Ireland
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| Posted: Sat Jan 19, 2008 7:36 am |
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Hello,
Is the contrast of your LCD is properly set?
Franck. |
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pokiko
Joined: 27 Jul 2007
Posts: 33
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| thank you |
| Posted: Wed Jan 23, 2008 10:32 am |
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| i have eliminated the problem. It was about the LCD. thank you Franck26 and Ramyses. |
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