ILI9341 not working

Philipp Höfler · ‎2017-11-12

Posted on November 12, 2017 at 14:44

Hi guys,

I am completely new to the STM32 stuff (I've done some projects with Arduinos) and I ran into some problems.

I am developing with an STM32L152RE board on Windows 10.

I did successfully the basic tutorials.

Now, I want to use a display. One problem with my Arduino projects was, that the painting the display is quite slow. So I would like to improve that with the STM32 family.

For that purpose I've a 2.4' SPI display with ILI9341 controller. In addition I've an Arduino Uno compatible shield. I connected the display with the shield and the shield with the STM32. As far as I understood the description the STM32 has a UNO R3 compatible pinout, right?

Here you can find more details about the hardware:

http://www.buydisplay.com/default/arduino-2-4-inch-tft-lcd-touch-shield-li9341-library-for-mega-due-uno

Then, I've created a new project in the WebIDE. I added latest mbed library. In addition I've added the SPI_TFT_ILI9341 library (

https://os.mbed.com/users/dreschpe/code/SPI_TFT_ILI9341/

). First I encountered some problems, due to the 'stm32l1xx_dma.h' dependency. I read that the dependency is deprecated, so I commented all the &sharpif that would be used for including the hardware specific file (SPI_TFT_ILI9341_NUCLEO.cpp).

Here is my code:

&sharpinclude 'mbed.h'

&sharpinclude 'SPI_TFT_ILI9341.h'

&sharpinclude 'Arial28x28.h'

SPI_TFT_ILI9341 TFT(D11, D12, D13, D10, D9, D8, 'TFT'); // (mosi, miso, sck, cs, reset, dc)

int main()

{

TFT.set_orientation(3); // ???????? ?????????? ???????

TFT.background(Blue); // ???????? ???? ???? (????? ???????)

TFT.foreground(0xFFFF); // ???????? ???? ?????? (??? ? ??????? rgb565)

TFT.cls(); // ???????? ????? ?????? ????

TFT.set_font((unsigned char*) Arial28x28); // ???????? ??? ?????

TFT.locate(30, 100); // ?????????? ?????? ?????? (???????????, ?????????)

TFT.printf('Hello habrahabr.ru'); // ??????? ?? ?????

}

I am following the instructions found here:

http://geek-mag.com/posts/258852/

The display background light is working, but the display itself does not do anything.

I would have expected, that the background will be painted blue and some text will appear in white.

Can anybody please point me in the right direction?

I am quite new to the hardware stuff ... 🙂

Thanks

#spi #ili9341 #display

Philipp Höfler · ‎2017-11-12

Posted on November 12, 2017 at 21:34

I found out, that the display is using the 8080-16bit interface by default.

It is possible switch the interface by soldering some JPs. Of course I can do that, but I thought it may be easier to use the 8080-16 interface.

Still, I have some problems to figure out the right pins.

In the meantime I switched the library to UniGraphic. It's still based on the same code, but it seems to be more convenient.

https://os.mbed.com/teams/GraphicsDisplay/code/UniGraphic/

Can anybody please help me figuring out how the wiring is setup and which pins I've to use.

Here is the updated code:

#define PIN_WR D14

#define PIN_DC_TFT D15

#define PIN_CS_TFT D10

#define PIN_RESET_TFT D9

ILI9341 TFT(PAR_16, PortA,

PIN_CS_TFT, PIN_RESET_TFT, PIN_DC_TFT,

PIN_WR, PIN_RESET_TFT, 'Adafruit2.8') ;

I've the feeling that it's completely wrong.

Especially the 2nd parameter confuses me. I understand that the library expects 16 wires/pins (16 bit) for sending data. I also found out that there are 'shortcuts' to address several ports with one keyword. But I do not know which pins exactly are included in PortA?

Thanks