ILI9341 with SW/HW SPI, 8/16 Bit parallel mode

Plons · Posted: Sun May 17, 2015 9:20 pm Post subject:

NTSX2102 are nice indeed, but hell .... a pitch of 0.5mm ! That's OK for professionally made boards, but for home-made boards it's a challenge.
And for the more vintage Bascom users: An easier to handle levelshifter is 74LVX125. Available in DIP and SOIC.

Cheers

Nard

Plons · Posted: Fri May 29, 2015 5:46 pm Post subject:

A different interface approach. I ditched the zeners and use Schottky diodes instead with a pull-up resistor network. Schematic attached as zipped .png

I also found a parallel version (8bit) of this board, with resistive touch. No touch-chip though ! The touchpanel shares pins with the display. Which means that these pins are interconnected with 250 resp. 400 Ohm of the panel !
Spent quite some time on it but every now and then it locks up. Latch-up presumably. HC245's are no levelshifters. I may use it in the future with an Arduino or ATXmega on 3.3V

Nard

AndersL · Joined: 25 Jan 2010 Posts: 92 Location: Kragerø,Norway

Thanks Netzman for your nice library Very Happy

In order to get the modified M328 lib working on a M1284 I had to add a ordinary Bascom SPI setup/init:

Plons · Posted: Thu Jun 04, 2015 3:09 pm Post subject:

Guys,

I tried to update the True Type Font Converter, found in folder Tools, and get a warning from my AntiVirus. False positive ? I don't like to disable AV-protection Sad

Oh, ... and I didn't give up on the 8bit parallel version with resistive Touch. Will post it when I am done testing.

Nard

Plons · Posted: Thu Jun 04, 2015 4:04 pm Post subject:

I am trying to use a larger font: color16x16.font as found in Samples/LCDGRAPH
to use with the ILI9341 library

I have seen troubles before caused by the header info:

Plons · Posted: Thu Jun 04, 2015 5:32 pm Post subject:

In the meantime I built a package with the ILI9341 TFT with resistive Touch of which the pins are shared with the TFT. Pictures are in the zip.
Ili9341_8bpar_2560_touch_r5_forum.bas is the main file.
Ili9341_inc_revK.inc is the revised lib as created by Mathias (Netzman)

The timing of the control-signals in parallel mode is improved in revI of the include,but that was unnecessary. My bad. Modified it back to Mathias' version.
The initialization of the LCD is altered (I got a stripy display), and of course the macro for the Touch was added. To prevent unnecessary current consumption by the Touch-panel, LCDdata is set to &HFF at the end of a write action. Saves 30mA ! And that's a lot when running on battery.

In your own program, call the Macro Read_touch every 1ms. If that's too much time-consuming, once every 5 ms is okay too, but reduce the Const Touch_debounce = 12 to 4.
The touch macro keeps track of the current orientation.

......

Due to the layout of this TFT, the LCD data bus is spread over 3 ports when used on a Arduino Mega2560. Grrrr.
The shortcut I took is re-routing the LCD bus to PortA and SD - SPI to the true SPI pins on the double row connector. This modification is done on the proto-shield, so no messing with the display or the Arduino. See picture

Enjoy

Nard

Edited June 7, 2015, 01:02 local time

sultanm9000 · Joined: 23 Aug 2014 Posts: 40

Hello
I need to draw connections this forum please

Plons · Posted: Tue Sep 29, 2015 5:46 pm Post subject:

It's unclear to me what you want/need. Please elaborate.

sultanm9000 · Joined: 23 Aug 2014 Posts: 40

schematic For Circuit

Plons · Posted: Tue Sep 29, 2015 10:38 pm Post subject:

The library is universal. So there is no such thing as a pre-defined schematic.

sultanm9000 · Joined: 23 Aug 2014 Posts: 40

I need a project to turn on the display (LCD_ILI9341) with the touchpad for Bascom AVR and thank you "Plons

Plons · Posted: Wed Sep 30, 2015 12:44 pm Post subject:

Attached the schematic of the ArdMega2560/LCD_ILI9341wT part of my project.

This code is in my MainProgram and reflects the HW in the attachment.

sultanm9000 · Joined: 23 Aug 2014 Posts: 40

Plons
Where (forum) for this scheme?
Thank you Plons

Plons · Posted: Wed Sep 30, 2015 5:15 pm Post subject:

The library I posted here: http://www.mcselec.com/index2.php?option=com_forum&Itemid=59&page=viewtopic&p=68399#68399

(Not sure but I think that this is what you meant)

sultanm9000 · Joined: 23 Aug 2014 Posts: 40

Thank you M.Plons