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stefyanna
stefyanna
Associate II
April 13, 2023
Question

How set graphic on display with STM32 MCU?

  • April 13, 2023
  • 4 replies
  • 3887 views

Hi,

I have this embedded display with resolution of 800x480, MIKROE-3620 which host at the back the STM32 MCU and many other features. I chose the STM32F746ZG as the MCU.

At first I created the project with MXCube, added TouchGFX component, build the project on Cube Ide, then I set the screen with TouchGFX and build it all with no error. The display is still black with no response. I also followed video, setted the SDRAM and QUADSPI, otherwise RAM and FLASH would overflow, but still no response.

With TouchGFX I just set 2 screens with button. A click on the button it would changes the screen.

So at this point, I have many doubts ...

I saw in many videos or documentation the use of LTCD periphery to control TFT display. Is it really necessary in my case, since the board has already a graphic driver? Here's the schematic of the display provided from the company. Even more, I'm afraid that when I activate LTDC, it selects pins that are assigned to others.

I also don't understand the communication protocol of the display. On the manual says that the touch control uses I2C communication, but I don't understand which communication protocol use the display?

I didn't plan to use FreeRTOS, but if it necessary is ok.

Here are some screenshot of SDRAM, QUADSPI and TouchGFX settings. I also uploaded the project.

What I'm doing wrong or I'm missing something?


_legacyfs_online_stmicro_images_0693W00000bi1O2QAI.png
_legacyfs_online_stmicro_images_0693W00000bi1O5QAI.png
_legacyfs_online_stmicro_images_0693W00000bi1OPQAY.png

This topic has been closed for replies.

4 replies

KDJEM.1
KDJEM.1
ST Technical Moderator
April 14, 2023

Hello @stefyanna​ ,

I advise you:

  • To start with an available example in STM32CubeF7: STM32Cube_FW_F7_V1.17.0\Projects\STM32746G-Discovery\Demonstrations\TouchGFX.
  • To take a look at his MOOC.

I hope this help you!

Kaouthar.

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stefyanna
stefyannaAuthor
Associate II
April 15, 2023

I actually followed the same step and the display is still black...

Tesla DeLorean
Tesla DeLorean
Guru
April 15, 2023

Doesn't it use an SSD1963QL9 with 1.2M of internal frame buffer?

https://www.arrow.com/en/products/ssd1963ql9/solomon-systech

Examples from MikroE would be more appropriate than the STM32F746G-DISCO, which drives that screen from an SDRAM based frame buffer, and parallel RGB signals to the display. ie LTDC rastering data from local memory.

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stefyanna
stefyannaAuthor
Associate II
April 15, 2023

Yes, exactly. It uses SSD1963 LCD display controller. In fact, as the picture shows:


_legacyfs_online_stmicro_images_0693W00000bi9zxQAA.png 

The LCD_DATA[0-15] (marked with dotted res rectangle "GFX Sig)), WR#, RD#, D/C#, CS# (labelled in yellow) coincide with the pins of connector CN5 of the schematic.


_legacyfs_online_stmicro_images_0693W00000biA0CQAU.png 

I toook a look on the datasheet and still is not clear how to deal with the chip SSD1963. So far I understood, that I need to deal with a few pins, that are D[0:15], D/C#, CS#, RD#, WR#, RESET#, and TE, as the picture from the pdf shows:


_legacyfs_online_stmicro_images_0693W00000biA0HQAU.pngBut how? The datasheet a long command table and description, but I'm confused how to use it....

It also talk about a framebuffer, but how to set it and pass to TouchGFX and MCU STM32?

Any advice?

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