LCD Display with T6963c and PIC18F4520

[MFK]

Hi ,

i'm using the Software Protoype Board from CCS and the PIC18F4520.
I got a LCD Display from Displaytech 128240A ( Datasheet http://www.displaytech.com.hk/pdf/graphic/128240a%20series-v11.PDF ). The Display has a T6963c Controller onboard.
I use the PCWH Compile Ver. 3.249.
I'm a beginner with Microcontrollers and although with LCD Displays :-(
I have tried to use the Extended GLCD Driver http://www.ccsinfo.com/forum/viewtopic.php?p=88147&sid=d9d0d4b9b5aa8d853cec821fb14fb251 but it didnt't worked until now.
Is it possible for me to use this Driver ? In the Display Datasheet it's said that ther must be Status Check before using the Display. Do I have to add this to the driver, or do I have to make this Status Check in my own Programm ?
The Driver is for 240 x 64 , how can i adjust the resolution ?
At the beginning of the Driver is written " LCD's FS is tied low (FS = 0 is 8x8 font) " is not a connection or ?
I know thats a lot of question for the beginning.
Thanks a lot.

Greetz

[PCM programmer]

[MFK]

Thanks a lot.
Thats really helps me. Unfortunately i cannot test it at the weekend, but i will do on Monday and i hope it works.

[MFK]

Hi

it nearly seems to working but just nearly.
I tried the example programm

#include <18F452.h>
//#device *=16
//#device adc=10
#use delay(clock=4000000)//,RESTART_WDT)
#use rs232(baud=9600, xmit=PIN_A2,rcv=PIN_A3)
#fuses XT, BROWNOUT, BORV27, PUT, STVREN, NOLVP

#include <T6963C.c>


void main() {
int n;
int8 bt_logo[11] = { //8x11 picture
0b00010000, // XX
0b00011000, // XXXX
0b00010100, // XX XX
0b01010010, // XX XX XX
0b00110100, // XXXX XX
0b00011000, // XXXX
0b00110100, // XXXX XX
0b01010010, // XX XX XX
0b00010100, // XX XX
0b00011000, // XXXX
0b00010000 // XX
};

glcd_init(240,128);
glcd_WriteByte(1, (LCDModeSet|LCDMode_XOR));
glcd_WriteByte(1, (LCDDispMode|LCDDisp_TXT|LCDDisp_GRH));
glcd_gotoxy(3,0,1); // 1 = text area of memory; note that there are only
// 8 rows of text possible
glcd_putc("Hi there.");


glcd_line(30,6,200,50,1);
glcd_line(3,6,20,50,1);
glcd_line(100,40,210,20,1);
glcd_box(14,14,100,60,1);
glcd_box(60,30,100,60,0);
glcd_square(20,12,180,50,1);
glcd_image8(&bt_logo[0],212,40,8,11);
glcd_image8(&bt_logo[0],216,40,8,11);

glcd_line(30,6,200,100,1);

glcd_square(2,32,130,113,1);

glcd_image8(&bt_logo[0],26,110,8,11);
}

but when i run it i just only see some stripes runnig over my display for maybe two seconds and than it stops at the end.
I can see at the PCW Debugger " Ready MCU at 1 MHZ " . Can someone please give me a hint what the problem could be.
Somestimes the programm just get only stucked in one of these while loops.
void glcd_WriteByte(int1 cd, int data)
{
int status = 0, temp = 0;
set_tris_lcd(0xff);
LCD.w_bar = 1;
LCD.r_bar= 1;
LCD.cd = 1;//defaults

while (status != 0x03) { // is LCD busy?
LCD.r_bar= 0;
temp = LCD.data;
LCD.r_bar = 1;
status = temp & 0x03;
}

set_tris_lcd(0x00); // All outputs
LCD.cd = cd; // Command/Data bar
LCD.data = data;
LCD.r_bar = 1; // not read
LCD.w_bar = 0; // write
LCD.w_bar = 1; // release
}


void glcd_WriteByteAuto(int data)
{
int status = 0, temp = 0; // status bits ARE DIFFERENT BITS THAN NORMAL
set_tris_lcd(0xff);
LCD.w_bar = 1;
LCD.r_bar = 1;
LCD.cd = 1; // defaults

while (status != 0x08) { // is LCD busy?
LCD.r_bar = 0;
temp = LCD.data;
LCD.r_bar = 1;
status = temp & 0x08;
}

set_tris_lcd(0x00); // All outputs
LCD.cd = 0; // This is always data, cd=0
LCD.data = data; // Put data on data bus
LCD.w_bar = 0; // write
LCD.w_bar = 1; // release
}

How can i check if my display is really busy ?

The last question , i don't really understand this command.
" #byte LCD = 0xf82 // portC address on 18F452 " ? Im using the PIC 18F4520, shouldnt make a difference , or ?


Thanks a lot.

[treitmey]

[MFK]

Hi ,

i tried it again today , with no success at the beginning. Than i made the bt sample again and it works fine. Maybe just only a connection was wrong yesterday.
Thanks a lot for the support. I will surely write again :-)

greetz

[Izzy]

Hello,
I am using T6962C graphics driver for my project that uses 24064A LCD from "crystalfontz.com". However I have been encountering this one small problem and I am not sure whats wrong with it.

When ever I print something using glcd_putc(); it prints one extra random character on the screen at the end, like 50% of the time.

For eg. If I try to print

glcd_gotoxy(6,0,1);
glcd_putc(" G-Force");

Then it will print:

G-ForceÄ

I am not sure why some random character are appearing at the end of the word. I would really appreciate if anyone could shed some light.

I am using CCS compiler, PIC18f4685 (40Mhz).

Thanks in advance
Izzy

[Izzy]

Also, one more question,

What do I need to change in the driver code to use 6x8 font?

I have made couple of changes, but the graphics shifted along with the text.

const int8 TextArea =0x0028;
const int8 GraphicsArea = 0x0028;


TextHome = (res_x/6)*res_y; //0x0F00;//0x0780;

[PCM programmer]

There are several T6963C drivers out there. Post a link to the source
code for it. Also post the name of the person who wrote it. That will
help to identify exactly which one you are using.

[Izzy]

I believe this driver was written by "treitmey"

Here is the link

http://www.ccsinfo.com/forum/viewtopic.php?t=19957&highlight=t6963c

[PCM programmer]

From his driver:

[Guest]

If I use

glcd_gotoxy(6,1,1);
then the text will appear in second line.

Probably (0,0) was supposed to be the top left hand corner.

[PCM programmer]

Post your compiler version.

[Izzy]

Compiler version: 4.013

[PCM programmer]

That's what I thought. You probably have this problem here:
https://www.ccsinfo.com/forum/viewtopic.php?t=24661&start=74

One possible work-around would be to change the glcd_putc() routine
so it only accepts printable characters. Example:
Changes are shown in bold below: