AVR Freaks

Thanks theusch for the pinouts.

I have all that figured out and wired to the LCD.

At this point my ignorance is with understanding the data sheet telling me when the character will be displayed and what command I need to use to display the character.

The data sheet is crazy. There are all kinds of commands to send to the display and always having to perform a status check routine before the LCD will read/write data to/from the data lines.

Then the other thing is that you may have to send one or two data writes for a command to be sent each data check will have to have a status check.
No big deal. Right now it is just a lot to absorb right now.

Like I said I would like to know how to use this display in TEXT Mode and not in Graphics.
If there is a way to set the display to only work in Text, all help is appreciated.

I have spoke to a Greenhouse controller engineer that designed a controller for a company that has been around for about 50 years.
The display that I am using, he uses as well. He was saying he does not do any status checks to see if the LCD is busy. He said the CPU 8088 runs slow enough that a status check is senseless. Interesting enough the controller works fine and he has rolled out two other models with the same display and CPU.
Here is the big kicker, he has written all the programs in F. I really do not even have the desire to look at that. It sounds like a dinosaur nightmare.

If you have any of the code in C that would be great if you could send it my way. If it has a lot of ASM code in there, it would be no use for me.
My goal is to use C and C++ and learn the Atmel processor.

All help is greatly appreciated.

Thank you David,
It worked out pretty good.
I don't know if the complete file loaded.
I noticed that the file was larger that 32Kb. Maybe I am not understanding the capacity of the Atmega32.

What did load on the chip, did show the display mfg and model and different fonts / graphics.

I concur with you about learning how to use the library.
I definitely would like a more attractive presentation on the display.

Thanks again.
Randy

Hello Everyone,

I need help.

It is almost a year now and ready to write c code through AS6.

For that time I have learned a lot more about programming with C and gained more understanding of functions.

So I am back on my project writing code in C to operate an LCD module with the t6963c control chip built into it.

I've learned I have lots of questions about this code with my project and hoping that someone can help me.

I have obtained libraries for this t6963c chip to operate it.

I am using an AVR-8 Atmege32 chip.

I know the display works when installing the hex file onto the Atmega32 for testing from david.prentice file he was kind enough to allow me to use.

I have now changed PORTs for Data and Commands from PORTC to PORTA. I have no hex file to test PORTA now or any idea how to test it to see if my data lines are proper.

Well I guess I kinda do have an idea but it is not working and all I am doing is checking the status of the display and to turn on a single LED that I have connected to PORTD pin 14 PD0 (RXD).

This LED does turn on and off with my code in a simple program to turn it on and off however I choose. So that works.

Using code to turn ON the LED and then turn it OFF after the code finds that that LED STA0 and STA1 are both set (0x03).

Checking STA0 & STA1 on the display pins is a must to send/read commands and data. Documentation of the t6963c says that these to pins must be high to read data or send commands.

This code will turn on the LED and will not turn it off.

I am guessing that the do-while loops is in an infinite loop.

Help! What can I do? JTAG is disabled for my fuse.

<

int main(void)

{

    ledInit();                             // initialize PORTC to be an Output port

    ledOn();                             // PINC0 (HI)

    do

    {

         // loop till STA0 & STA1 are not 0x03 (0x03 = ready(=)

    }

    while((0x03 & glcd_sget()) != 0x03);

    ledOff();                             // PINC0 LOW

    return 0;

}

int glcd_sget(void)  // get LCD display status byte
{
    ledOff();
    int glcd_status;

    glcd_SET_DATADIR_IN();               

    glcd_cd_high();                             // bring LCD C/D line high (read status byte)
    glcd_rd_low();                              // bring LCD /RD line low (read active)
    glcd_ce_low();                             // bring LCD /CE line low (chip-enable active)

    asm volatile ("nop"::);
    asm volatile ("nop"::);

    glcd_status = glcd_DATA_PIN;      // read LCD status byte

    glcd_ce_high();                             // bring LCD /CE line high, disabling it
    glcd_rd_high();                             // deactivate LCD read mode
    glcd_SET_DATADIR_OUT();           // make 8-bit parallel port an output port

    return(glcd_status);
}//sget1()

>

Bobgardner:

Thanks for the heads up.

Found the issues with lower STA 01 & STA 02 (bits 0 and 1) always being zero.

1.

Had a 1k Ohm resistor on RST rather than a 10k to have a power up reset as prescribed in the t6963c application notes.

2.

Sequence to enable read, data, chip select and reverse the sequence are now in order.

3. removed 13 inches of ribbon cable between the LCD and the ATMEGA32.

Now I can check status and write characters to the display. 

I just see on glitch on display I may ask about later if I don't get it.

It would be more at the programming end.

Thanks dbrion0606,

That is good to know. I did not know that.

Thanks dbrion0606,

That is good to know. I did not know that.