HD44780 not initialized

[shilow]

Hi!

I am a beginner in ChibiOS/RT.
first I tried to use by the LCD screen stm32vldistsovery.

I took a working sample project and moved him out of his driver in a test project for stm32vldistsovery.

and here I was unlucky - this code does not work, LСD is not initialized.
maybe I made a mistake somewhere?

This working project:

stm32vld_lcd_2x16_test.7z

working project

(9.75 KiB) Downloaded 653 times

And this is my attempt to cross HD44780 and Chibios:

stm32vld-ChibiOS.7z

nonworking project

(10.38 KiB) Downloaded 646 times

thank you in advance for your help.

[shilow]

Hi All!

Maybe someone can share a working example without using µGFX?

Thanks.

[Tectu]

Maybe someone can share a working example without using µGFX?

Note that the TDISP module and therefore the HD44780 driver have been removed/deprecated from the µGFX project. It was announced in the forum including a hint that the driver is/was not working anymore.

Edit: Moved this thread to the STM32 support forum.


~ Tectu

[shilow]

I figured out what the problem was.
In my case did not work function palClearPort() and palSetPort().
I replaced them on palSetPad()/palClearPad() for single bit, and pal_lld_setport()/pal_lld_clearport() for groups of bits.

working example in the attachment.

stm32vld-ChibiOS.7z

working hd44780 example

(10.41 KiB) Downloaded 757 times

[tronicgr]

Thank you for your working example!

Can I use 3.3v character LCD like this one for this example?

http://www.ebay.com/itm/16x2-1602-Character-LCD-Module-Black-Background-Yellow-Characters-3-3V-/170972304955?pt=LH_DefaultDomain_0&hash=item27cebe563b

I got some of them (3.3v) by accident and I was wondering if they can be used with my STM32 discovery boards...

Thanks
Thanos

[shilow]

Thank you for your working example!
Can I use 3.3v character LCD like this one for this example?

yes, of course.

if there is the datasheet for your display - verify the initialization procedure, it may be slightly different.

[russian]

FYI - I have to change the delay logic to get this code working with my display:

Code: Select all

   palSetPad(LCD_PORT, LCD_PIN_E); // En high
   chThdSleepMicroseconds(10); // enable pulse must be >450ns
   palClearPad(LCD_PORT, LCD_PIN_E); // En low
   chThdSleepMicroseconds(40); // commands need > 37us to settle

[shilow]

The author of used library:
"ZiB" <[email protected]>
http://ziblog.ru/

updated sources

stm32vld-ChibiOS.7z

working examples

(10.49 KiB) Downloaded 714 times