Hope users, don't mind if i create own thread in english language. I've been trying to init display for 2 days but without any success..I assembled another display with driver hd44780 and worked like charm.. I searched and read almost all threads dedicated to EA Dogs here.All i got some errors or compiled programs with no effect to display.. The problem is i didn't handle the display too well,there's a little scratch and i do really know if it's in working condition.. It's connected to atmega8 ( 4bit interface , 3,3V ) -> DB4-DB7 is connected to PD0-PD3 and PD4 ->RS, PD5->E , PD6->R/W. I prefer C-language. All i need to know if display still works,if so, i'll spend some time to customize the library for my needs.
Hi, we have had the same problem a couple of weeks ago. I think you forgot to connect pin PSB (I think it's pin 23) to VDD. This is absolutely necessary for a communication in parallel mode. Otherwise, the display expects data in serial mode. And be carefull! I cracked two of this delicate parts during my attempt to cut off the pin from a ground pad on the pcd... If it still doesn't work: I can pick out a working code for you. Regards, Daniel
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Thank you for quick reply.. PSB is connected to 3.3V.I checked the scheme with datasheet..It should be good.. Pls post some working code..It makes me really mad these days.. By the way between pads CAP1N - CAP1P and Vout-Vin should be electrolytic capacitors? Here's my ea dog scheme to get a picture if something is not wronG..I included atmega8 pins.
Hello Martin, I've attached my c-module for an DOG-M 163, 4bit interface, 3.3V for ATmega32L.
And the pin connections: RS -> PC6 E -> PC4 RW -> PC5 D6 -> PC2 D7 -> PC3 D4 -> PC0 D5 -> PC1
I replaced all PORTC with PORTD.. RS,R/W,E are connected as you connected them..the only change i'm using portD. Could you give me a hint what i should place in the main() to see "hello" on the display? I'm playing with the code..
1 | int main() |
2 | {
|
3 | lcd_init(); |
4 | lcd_clear(); |
5 | lcd_goto_xy(1,0); |
6 | lcd_write("hello"); |
7 | |
8 | return 0; |
9 | }
|
Your main function is ok and should work. The parameters for
lcd_goto_xy() mean: x (0 to 15) is the column, y (0 or 1 on your
display) is the row. After calling lcd_init() the cursor is set to
coordinates (x,y)=(0,0). The display is also cleared during lcd_init().
So for just writing "hello" to the device it is enough to do the
following:
int main(void) {
lcd_init();
lcd_write("hello");
}
After this the cursor will be set to the coordinates (x,y)=(5,0), and
e.g. 6 calls to lcd_write("hello") will result in ..
hellohellohelloh
ellohellohello
Btw: I'm using different capacitors than you: VIN,VOUT: 2.2µF, CAP1N,
CAP1P: 1µF.
I'm desparate as i can declare.. Rik: Do you still got one of this displaY?I want to confirm mine is dead. I attached the code .Without any error but the display is still blank.. RS -> PD6 E -> PD4 RW -> PD5 D7 -> PD3 D6 -> PD2 D5 -> PD1 D4 -> PD0 Pls tell me somebody the display is dead because i'm losing my patient :) I can't take it out from breadboard.If i do so,the display break into thousand peaces..
Hi Martin, I reviewed my code (3-line display) and made the necessary changes to adopt it to your 2-line device. The changes are documented in the source code. I also included the datasheet for the st7035 display controller. Unfortunately I'm unable to test it, because I have no such 2-line device. Best regards Rik
THank you..I checked with datasheet.It's clearly now..The INIT must be good to interface in 4bit mode with 2 lines. Im thinking that we do not coordinate with the signals RS,E,R/W. They have to be set to work with display..
1 | void lcd_enab(void); |
2 | |
3 | void lcd_enab(void) { |
4 | PORTD |= 0x10; |
5 | _delay_us(40); |
6 | PORTD = 0x00; |
7 | }
|
There's 2x lcd_enab which should be there..I wonder why compiler doesn't signal there's duplicate. What does this command do? PORTD |= 0x10; Its Bitewise OR... Portd = Portd | 0x10.. It's something with E (because its connected to PD5) Rik thank you for your advices !You've helped a lot..Now it's time to get display working which i havent managed yet :D
"void lcd_enab(void);" is the forward declaration, void lcd_enab(void)
{..} the function definition. The declarations for the other function
are stated in the header-file. The enable-function is not contained in
the header-file, because lcd_enable() shall not be part of the C-module
interface (only part of the implementation). According to the selected
compiler options you will get a warning about missing forward
declarations. For more info consult the ISO-C-standard and the gcc
manual.
> What does this command do? .."PORTD |= 0x10;"
Pull enable pin (E) high (1), without altering the other pins on the
port. This is the signal for the lcd-controller, that it can read the
data from the parallel port.
Understood..I made some changes in code.Added few features. Now it should work. Pls somebody must be out there with EA DOG 16x2 :)
Just tested your program on dogm163 (using my lcd_init, of course and changed port d to c). Well.. it doesn't work :-/ Btw I found some errors: line 31: I guess this must be DDRD=0xFF or at least 0x7F. line 121: "DDRD" !!!
Did your program work which you provided at first?Have you tried it?I'm totally disappointed with this LCD ..Nobody makes the displays with the st7036 controller but EA DOG :) Yeah , those 2 errors were there :)
damn,Ea dog is going to the trash !!I destroyed it :) I just connected display (the Hd44780) and it works with a code for ea dog :) Unbelievable.
can anyone give me the pin details for the display for SPI PROTOCOL.i want MISO MOSI NSS SCK details.the data sheet is not clear.
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