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I have an old TFT display (extracted from an MP5 player) and I can't figure out how to connect it with an arduino nano, pls help. here's the datasheet of the TFT: http://read.pudn.com/downloads137/sourcecode/embed/586271/Varitronix-2.8-lcd/vl-ps-cog-t280mbqi-041.pdf Thank you.

  • The datasheet says it all: A ILI9320 display driver with a 16-bit data bus (instead of SPI). Can you show a picture of the display and the connections? It's pretty close to learn.adafruit.com/…. (8bit). If no 16-bit parallel driver is available you'll have to look at the ILI9320 datahseet and build one. However, if your objective is just to get a display for an Arduino, just buy a new well-known display with a simple SPI interface for which there are drivers. – Maximilian Gerhardt May 17 '18 at 10:08
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    Is this datasheet hosted on the end of a 56k dialup modem...? – Majenko May 17 '18 at 10:11
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The Nano isn't a good choice for driving that screen. You need almost all the pins of the Nano to connect to the screen alone, and there's not enough to include the touch-screen as well. And that's when you're not using the serial port of the Arduino (TX/RX pins) for communication with the PC.

You need to connect:

  • 16 data pins
  • /CS pin
  • /RS pin
  • /WR pin
  • Optionally RD pin, or tie it to 3.3V
  • /RESET pin

And all those need to be level shifted to 3.3V.

You need to provide 3.3V to VCC1/2 and VCI. The LED A connects to 5V (since it has more current capacity than the 3.3V) and each LED Kx pin through a suitable resistor (220Ω maybe) to ground.

The touchscreen needs the X- and Y- pins connecting to a digital IO pin, and the X+ and Y+ pins to analog IO pins that can also double as digital IO pins (so not A6/A7 on boards that have them).

And then you need to obtain or write the software to drive the ILI9320 through the 16-bit interface.

Driving the interface is simple enough:

Initially:

  1. Set /CS HIGH
  2. Set /WR HIGH
  3. Set /RD HIGH (if not tied to 3.3V)
  4. Set /RESET HIGH
  5. Short delay
  6. Set /RESET LOW
  7. Short delay
  8. Set /RESET HIGH

Then to transfer a group of 16-bit words:

  1. Set /CS LOW
  2. Set the value to write on the 16 data pins
  3. Pulse /WR LOW then HIGH
  4. Repeat from 2 for each word
  5. Set /CS HIGH

Refer to the ILI9320 datasheet for how to control the chip, or use existing library code (does uTFT or u8glib support it?).

For the touch screen it's a case of setting Y- LOW and Y+ HIGH, and X- and X+ to INPUT, then reading the analog value from X+. Repeat with X- set LOW and X+ set HIGH, and both Y set to INPUT, and read the analog value from Y+.

You can also get better results by reading multiple inverted settings:

  • Y- = LOW, Y+ = HIGH, X- = INPUT, Read X+.
  • Y- = HIGH, Y- = LOW, X- = INPUT, Read X+.
  • Subtract the second reading from 1023
  • Add the first and (modified) second reading
  • Divide by two.
  • Repeat for X-/X+ reading from Y+.

You can also take multiple readings and average them out to reduce noise and stabilise the output somewhat.

And of course on top of all that you need to find a way to connect to a 0.5mm pitch connector. Normally a 0.5mm pitch FPC socket is used, which means a PCB with one on. You may be able to find 37 pin adaptor for it, but 37 pins isn't a common format. Normally 50 pin is more common to accommodate a more general purpose interface including the M0-M2 pins that allow you to select the interface type, as well as an 18-bit data bus to allow full RGB6/6/6 interfacing, and even buffer-less clocking of raw display data for very high speed display updates by MCUs that support such an interface.

  • I'll try it later (can't do it now because my computer is toast), thank you for your help by the way. i'll tell you later if it worked. – Windows Nuke May 17 '18 at 12:28

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