PIC to LCD

[pijang]

Hi everybody

Actually i want to ask something about my project

im using PIC16F877A and LCD display 16x2.

Im using ccs compiler to program and galep 32 to burn the program into PIC.

The problem is there is nothing appear at my LCD.

Can somebody check this coding for me..

Is there anything to add?

i modified a little bit from lcd.c to lcd2.c because im using port B

The given coding in the CCS is using PORT D as its output.



#include <16f877a.h>
#device adc=10;
#use delay (clock = 4000000)
#fuses xt, noprotect, nowdt, nolvp
#byte PORTA = 5
#byte PORTB = 6
#define use_portb_lcd TRUE
#include <lcd2.c>

main()
{
int valuein, valueout;

set_tris_b(0); //set port b as output

setup_port_a(ALL_ANALOG); //port a all analog input
setup_adc(ADC_CLOCK_INTERNAL);
set_adc_channel(1); //using port AN1

valuein = read_adc(1); //read from port AN1

valueout = valuein*2.8;



lcd_init(); //LCD initializing
do
{
lcd_putc("\fThe value is\n");
lcd_putc(48+valueout);

delay_ms(1000);
}
while(1);

}


Hopefully, somebody can reply

Thank u in advance..

[PCM programmer]

Here is a demo program that shows how to read the A/D and display
the output on an LCD:
http://www.ccsinfo.com/forum/viewtopic.php?t=28842&start=7

[pijang]

Actually im a little bit confius about flex_lcd.c??? :
I have to add this code or what am i supposed to do?
Can u just tell me which one is wrong from my coding.

[PCM programmer]

[pijang]

Yup. The word the value is didn't appear at my LCD.
And what i read, the LCD will show one row of black squares.
But this also didnt happen. Is it my connection for VLC didnt correct?
I connect to resistor and then to ground..

I modify the lcd.c from the ccs directory. im using port B as my output..

[PCM programmer]

If the contrast is connected to ground, then it's good enough so that
you should see something.

It's possible that you have other problems with the LCD connections.

This page has an LCD to PIC schematic. Scroll down about 1/3
of the way on the page to see it. Notice that the upper four bits
on the LCD data bus are used. The schematic labels these as D4-D7.
http://www.mikroe.com/en/books/picbook/7_09chapter.htm

Here's another schematic that shows the LCD pins that must be used.
Again, notice that the upper 4 bits on the LCD data bus are used.
(Not the lower 4 bits).
http://www.electronic-engineering.ch/microchip/datasheets/lcd/lcd_connectivity.pdf


Here's a link to the Flex LCD driver in the CCS Code Library forum:
http://www.ccsinfo.com/forum/viewtopic.php?t=24661
The reason I posted that driver is because it's easy to use. One time,
someone complained that the CCS driver is too hard to configure
if you use different pins than the ones shown in the LCD.c file. The
person said that in PicBasic-Pro, you can just specify a list of the pins
that you want to use at the top of the file. He asked why can't CCS
provide a driver like this ? So from that, I got the idea to make a
a driver that could do this. I called it the Flexible LCD driver and posted
it in the Code library. I suggest that you use it. It's just easier.

-------
Edit: Fixed a typo.

[pijang]

Ok thanx.. I will try to use your flex lcd program first..
i Hope it will work..

Thanks a lot..

[pijang]

I am quite confused about this program from flex_lcd.c

// If you only want a 6-pin interface to your LCD, then
// connect the R/W pin on the LCD to ground, and comment
// out the following line.

#define USE_LCD_RW 1 <-- Can i delete this coding from your program because im using 7-pin interface with my LCD.

// If the R/W signal is not used, then
// the busy bit can't be polled. One of
// the init commands takes longer than
// the hard-coded delay of 60 us, so in
// that case, lets just do a 5 ms delay
// after all four of them.

#ifndef USE_LCD_RW
delay_ms(5);
#endif

Can i delete this row too?
or i should put this coding although i will never use it?

[PCM programmer]

[pijang]

ooo.. Now i understand
Because i think i must adjust it suite with my application
So i only change from port D to port B if i want to use port B as my output?

Ok. Thanx

[PCM programmer]

That's right. The driver as posted, is already setup for a 7-pin interface.
You only need to change the list of pins (at the top of the file) to use your
pins on port B.

[pijang]

My LCD is working and show the value.
But the problem is why this coding below does not appear?
I know i should use ascii number if i dont use the symbol "...."
But i quite confius why also it doesnt show anything

valuein = read_adc(1); //read from port AN1

valueout = valuein*0.035;
result = 48+valueout; <-- 48 is in ascii, which is 0

lcd_putc("\fThe value is\n"); <-- This one appear at my screen

lcd_putc(result); <-- This one didnt appear..

I already try to change all the word result in ascii, but also it doesnt show anything

Can u help me..

[PCM programmer]

[pijang]

Below is my programming..

#include <16f877a.h>
#device adc=10;
#include <stdlib.h>
#include <math.h>
#use delay (clock = 4000000)
#fuses HS, noprotect, nowdt, nolvp
#byte PORTA = 5
#byte PORTB = 6
#define use_portb_lcd TRUE
#include <flex_lcd.c>

void main()
{
double valuein, valueout, result;


set_tris_b(0); //set port b as output
setup_port_a(ALL_ANALOG); //port a analog input
setup_adc(ADC_CLOCK_INTERNAL);

portb=0x00;
delay_ms(3000);
portb=0;

lcd_init();

do

{

set_adc_channel(1);
delay_us(20);
valuein = read_adc(1); //read from port AN1
valueout = valuein*0.035;
result=48+valueout;


lcd_putc("\f The value is\n");
lcd_putc( 48+valueout );

delay_ms(2000);

while(1);

}

}

[Guest]

Sorry, iforget to put the worh at include

#include <16f877a.h>
#device adc=10;
#include <stdlib.h>
#include <math.h>
#use delay (clock = 4000000)
#fuses HS, noprotect, nowdt, nolvp
#byte PORTA = 5
#byte PORTB = 6
#define use_portb_lcd TRUE
#include <flex_lcd.c>

void main()
{
double valuein, valueout, result;


set_tris_b(0); //set port b as output
setup_port_a(ALL_ANALOG); //port a analog input
setup_adc(ADC_CLOCK_INTERNAL);

portb=0x00;
delay_ms(3000);
portb=0;

lcd_init();

do

{

set_adc_channel(1);
delay_us(20);
valuein = read_adc(1); //read from port AN1
valueout = valuein*0.035;
result=48+valueout;


lcd_putc("\f The value is\n");
lcd_putc( 48+valueout );

delay_ms(2000);

while(1);

}

}