PIC16f877 & LCD problem

[Vodka]

Hi all, i`m trying to display something on my lcd but i can`t succeed.
I use a pic16f877 and a lcd(AC202A).
The pinout is:

B0 - unused
B1 - unused
B2 - enable
B3 - rs
B4 - data
B5 - data
B6 - data
B7 - data

rw - GND

so i use a 4 wire data for signalling.I modified the lcd.c file from root as follows(http://www.edaboard.com/ftopic64934.html):
________________________________________________
// Un-comment the following define to use port B
#define use_portb_lcd TRUE
________________________________________________
________________________________________________
struct lcd_pin_map {
BOOLEAN unused1; // For RB0
BOOLEAN unused2; // For RB1
BOOLEAN enable; // For RB2
BOOLEAN rs; // For RB3
int data : 4; // For RB4-RB7
} lcd;
________________________________________________
________________________________________________
comment any line contain 'rw.lcd'
________________________________________________


The main code is:

#include <16F877.h>
#fuses XT // Oscillator mode
#fuses NOLVP, NOWDT // No Low Voltage Program, No Watchdog timer
#fuses NOPROTECT // Code no protection
#use delay(clock=20000000)
#include <lcd.c>

void main()
{

setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);

lcd_init();
lcd_gotoxy(1,1);
lcd_putc("Hello");

}

The CCS compiler is version 3.249

I can`t see anything on my lcd!!!
Please help me,
Regards Vodka

[Ttelmah]

You have 'XT' selected as the oscillator mode, but 20Mhz shown as the frequency in the delay statement. These two things are incompatible...
Are you sure you have the _right_ data lines selected. Note that in 4bit mode, it is the _high_ four data lines that are used. Double check your wiring.
Check/correct these.
What have you got on the Vlcd line for the display?.

Best Wishes

[Vodka]

The wiring is all correct and about "What have you got on the Vlcd line for the display?. " i don`t understant what that means.

[PCM programmer]

Here's the data sheet for your LCD. This is a 20x2 LCD.
http://www.ampire.com.tw/Spec-AC/AC-202A.pdf

You're trying to use the LCD with the connections similar
to the schematic shown on this page, except that you
are using PortB instead of PortD and PortE. You are not
using the R/W pin. It's connected to Ground, as shown
in this schematic. Also, you must have a contrast trimpot
connected as shown in this schematic. You can use a 10K
trimpot. Set the initial contrast voltage to 0.5 volts.
http://www.rentron.com/PICX1.htm

I suggest that you don't try to modify the CCS driver.
It's easier to use the Flex driver. See this link:
http://www.ccsinfo.com/forum/viewtopic.php?t=24661

Here are the #define statements that you must have at
the start of the Flex driver:

[ELCouz]

also if the lcd is giving you trouble to display something try:

[Vodka]

Unfortunately i have tried the Flex driver and the delay_ms(100); before lcd_init() but i have no luck. If i use the flex driver i can`t see anything on my lcd and if i use the lcd.c file from root and modified as i shown i can see just the first black line appear.
Any new suggestions please ????

[PCM programmer]