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memoally
Joined: 25 Jan 2010
Posts: 35
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| need help with lcd? help please! |
 Posted: Mon Mar 01, 2010 7:35 am |
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Hello everyone. I use a pic16f876 and an lcd. My aim is to print some wtitings on lcd. I can do it on Proteus but I can't realize it although I think my connections are true. I connect Enable to pin b0, Register Select to B1, Read/Write to B2 and DB7 - b7, DB6 - b6 , DB5 - b5, DB4 - b4 and I connect Vdd and Vss. I also connect V0 to ground. But it did not work. Here is my code. But I have some misunderstandings on code?
What should be the values of #define LCD_DATA_PORT 4, LCD_TRIS_LOCATION 0x86, and #define LCD_TYPE 2? Also what are they for? Do I need to use lcd_setup or lcd_load functions??? If I need can anyone correct the code???
Please help...
Here is the code:
| Code: | #include <16F876.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES RC //Resistor/Capacitor Osc with CLKOUT
#FUSES NOPUT //No Power Up Timer
#FUSES PROTECT //Code protected from reads
#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
#use delay(clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#define use_portb_lcd TRUE
#define LCD_ENABLE_PIN PIN_B0
#define LCD_RS_PIN PIN_B1
#define LCD_RW_PIN PIN_B2
#define LCD_DATA_PORT 4 //what should this value be?
#define LCD_TYPE 2 //is it 2 columns? or rows?
#define LCD_TRIS_LOCATION 0x86 //what should this value be?
#include <lcd.c>
void main()
{
lcd_init();
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_spi(SPI_SS_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
set_tris_b(0x00);
while(1)
{
lcd_gotoxy(1,1);
printf(lcd_putc,"Hello");
lcd_gotoxy(1,2);
printf(lcd_putc,"World!");
delay_ms(5000);
}
} |
_________________
compiler version: 4.105
pic: 16f876
clock frequency: 4MHz |
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husam
Joined: 17 Feb 2010
Posts: 10
Location: jordan
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memoally
Joined: 25 Jan 2010
Posts: 35
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| Posted: Mon Mar 01, 2010 11:32 am |
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First of all thank you husam, for your answer. I have not tried this yet
but I am trying to learn where the mistake is with my code. Should I add:
| Code: |
#define LCD_DB4 PIN_B4
#define LCD_DB5 PIN_B5
#define LCD_DB6 PIN_B6
#define LCD_DB7 PIN_B7
#define LCD_ENABLE_PIN PIN_B0
#define LCD_RS_PIN PIN_B1
#define LCD_RW_PIN PIN_B2 ?
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I also want to learn what is ''#define LCD_TRIS_LOCATION'' and ''#define LCD_DATA_PORT ''. What are they for? Is lcd_data_port
means 4 bit or 8 bit operation? Could you correct my code please?
Or anyone, please...
_________________
compiler version: 4.105
pic: 16f876
clock frequency: 4MHz |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Mar 01, 2010 12:29 pm |
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Don't use that LCD driver. Use the Flex driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=24661
| Quote: |
I also want to learn what is ''#define LCD_TRIS_LOCATION''
and ''#define LCD_DATA_PORT ''. What are they for? Is lcd_data_port |
With the Flex LCD driver, you don't have to worry about any of this
stuff. All you need to do is #define the pins. |
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memoally
Joined: 25 Jan 2010
Posts: 35
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| Posted: Mon Mar 01, 2010 4:12 pm |
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but i dont have it,and i am supposed to use this lcd :( i dont know the exact producer or firm,but on the back side there is a writing HY-0802B-001-R,i have a datasheet of this,if you want i can share it...
_________________
compiler version: 4.105
pic: 16f876
clock frequency: 4MHz |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Mar 01, 2010 4:18 pm |
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| Quote: | | but i dont have it |
What do you mean by this ? The Flex driver is available at the link that
I posted. Just click on it. Just do it. |
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memoally
Joined: 25 Jan 2010
Posts: 35
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| Posted: Mon Mar 01, 2010 4:25 pm |
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sorry,i told wrongly,i guess.this is not a training,or exercise,in my work there is a project about pic,i get the job recently,and the specifications were determined long time ago,also components are bought :( so i have to use this lcd  i am trying to test lcd for a few days,but i cant make it to write anything on lcd,my connections are true,i know it,but there may be some mistakes on that simple code.for example i don't know how to choose 4 bit or 8 bit data operation,i mean the exact code for it, (#define ...???...).so i wanted your help
_________________
compiler version: 4.105
pic: 16f876
clock frequency: 4MHz |
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