UC1628 parallel driver (128x64)

[ullahsh]

I am developing parallel port 8080 driver for UC1628 lcd, do you have any basic driver for parallel port to up the lcd.
wanted to know the state of WR0,WR1,RST and RS pin of LCD to write data into it.
Any help would be appreciated.
Regards,
Shafi

[olikraus]

Everything seems to be there in the UC1628 datasheet.
WR0/WR1 --> Page 30 and page 46
RS --> register select, part of the comman tables, called "C/D" on page 13
RST --> should be the usual low level reset input

[ullahsh]

Should we expect 6.34 voltage at Vlcd pin before we configure any UC1628c register?

[olikraus]

Unknown, I assume this depends a lot on the circuit around the display itself.

[ullahsh]

oh....can u please explain the steps to read data from the register example:pump register

[olikraus]

I never read any data from any display. In fact u8g2 will only write to the display. I don't see the need to read from a display. Anyhow: I can not help with reading the display. It should be described in the data sheet.

[ullahsh]

My lcd is up and running, The issue was in hardware for selecting the interface. which was wrongly configured for SPI, instead of parallel 8080. Thanks for the support.

[bhavyasrig]

I'm also trying to develop for Parallel port(8080) basic driver. It would be helpful if you can point us to gitlab path if already exists.
Thanks in advance for the help.

[olikraus]

u8g2/csrc/u8x8_byte.c

Lines 227 to 239 in d23f354

	b = *data;
	data++;
	arg_int--;
	for( i = U8X8_MSG_GPIO_D0; i <= U8X8_MSG_GPIO_D7; i++ )
	{
	u8x8_gpio_call(u8x8, i, b&1);
	b >>= 1;
	}
	u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->data_setup_time_ns);
	u8x8_gpio_call(u8x8, U8X8_MSG_GPIO_E, 0);
	u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->write_pulse_width_ns);
	u8x8_gpio_call(u8x8, U8X8_MSG_GPIO_E, 1);

Note: The /WR signal is called "E" in the U8g2 code.

[fuyuqingfeng]

Hi olikraus
I am debugging the 12864 LCD screen based on the uc1628 drive, I want to use the u8g2 library, but I don't see the uc1628 driver file in the source code, which driver file can I use? （uc1601?uc1611?.... ）
Hope to give me some advice。
Best Regards

[fuyuqingfeng]

I use the 8080 mode for communication

[olikraus]

There is no support for the UC1628 at the moment. I also do not know any compatible display controller.

[olikraus]

Note: There was an issue for this display: #1066 and #1453
But we were not able to finish this, but this issues includes the datasheet for the display controller.

[olikraus]

@fuyuqingfeng @ullahsh @bhavyasrig
Is there any online marketplace where I could buy a UC1628 LCD?

[bhavyasrig]

We have ordered via our organization, not sure how to order to one piece seperately.

[shlyakpavel]

Hi @olikraus,

Coincidentally, I have a few UC1628 LCD modules in my possession and I'd love to provide you with one of these modules free of charge. I can take care of shipping via DHL for a quick and secure delivery.

Please reach out to me at [email protected] with your shipping details, and I'll get everything arranged.

[olikraus]

Nice offer. Unfortunately I am currently almost unable to work on u8g2 due to some "real" work which is required here.

[shlyakpavel]

@olikraus I can send you one anyway and you can store it until you have more free time or more interest in this particular display. There's no hurry and I would be happy to send you one even if you don't play with it any time soon

[olikraus]

Let me participate at the cost. Can you reach me on my e-mail account? See source code.

[schmidtas]

Hello everyone,
I would like to take up the topic again.
Were you able to support the library for the UC1628? Or has someone been able to adapt a working file in the meantime?
Thank you in advance for your feedback.

[olikraus]

I am still searching for an option to buy once display.

[schmidtas]

Dear Oli,
can you send me your Adresse via private Massage.
I'm also located in DE and I will send it directly via DHL.

[olikraus]

My email address is there in every .c file and .ino example file...

[olikraus]

I have created an issue: #2260

[olikraus]

@fuyuqingfeng @ullahsh @bhavyasrig @shlyakpavel

I have created a 128x64 variant of the UC1628 based display based on the code for a 256x128 display with the same controller.
The implementation may not work yet, but it could be a good starting point. However I need your feedback, whether and how it works as of now.

A subset of the constructors are also added to all examples:

U8G2_UC1628_128X64_1_8080 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7,  /*enable=*/ 18, /*cs=*/ 3, /*dc=*/ 16, /*reset=*/ 17); // UC1628 pin names: enable: /WR, dc: CD
U8G2_UC1628_128X64_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
U8G2_UC1628_128X64_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
U8G2_UC1628_256X128_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
U8G2_UC1628_256X128_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);

Of course, there is also a 8080 constructor for the 256x128 display, it is just not listed in the examples.

The new code is available in beta release 2.35.6. Maybe someone can test this 128x64 display and give some feedback.
Testing goal: We should be able to see something. Any kind of black pixel (garbage, font, anything) would be great.
You can test both the 256x128 or the 128x64 driver to see something.
As a test, use the ContrastTest and the FlipMode examples from the Arduino IDE.
Please send a picture of at least some black pixel are visible.

Also consider to give feed back in the official issue here: #2260

You can download the latest U8g2 beta release from here: https://github.com/olikraus/U8g2_Arduino/archive/master.zip
Arduino IDE:

1. Remove the existing U8g2_Arduino library (https://stackoverflow.com/questions/16752806/how-do-i-remove-a-library-from-the-arduino-environment)
2. Install the U8g2_Arduino Zip file via Arduino IDE, add zip library menu (https://www.arduino.cc/en/Guide/Libraries).

PlatformIO:
platformio.ini (https://docs.platformio.org/en/latest/projectconf/section_env_library.html#lib-deps) should include

lib_deps =
  u8g2=https://github.com/olikraus/U8g2_Arduino/archive/master.zip