PIC to LCD

[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);

}

}

[Guest]

Sir, actually at the include coding have stdlib.h, math.h and flex_lcd.c
I dont know why it does not appear when i posted at this forum

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

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);

}

}

[PCM programmer]

The #include files are missing because when you posted your code,
you didn't disable HTML. There's a tickbox below the posting window
to do this. It looks like this:

[pijang]

what do u mean by casting?
Is it i have to change the double function to int8 at the top coding?

I have read some notes telling that we must limit the input value.
For example if my input is until 4 or 5 decimal places, i have to cut it down to 2 or 3 depends on my PIC. Is it right?
Then can i know how to limit the input value until 1 or 2 decimal places
For example let say 2.3569 become 2.35..

Then i have to set the program become like this
lcd_putc(48+D1&"."&48+D2&48+D3);

D1=first digit which is 2
D2=second digit after "." which is 3
D3=third digit which is 5

How do i want to set this coding if this assumption is correct?

[PCM programmer]

http://www.ccsinfo.com/forum/viewtopic.php?t=29157&highlight=printf+lcdputc

[pijang]

oo. Now i understand...
So i must use printf command for my analog input..
So how about the rest of my question..

can i limit the value from my input until 2 decimal places?
and what i should declare at the top of this coding?

Is it just using the double function and change lcd_putc to prinf
or i have to use int8 instead of double function?

for example
int8 valuein, valueout, result;