For confusion on selecting Graphical LCD for STM32F746

[Chopra.Deepak]

Posted on February 09, 2018 at 09:42

I would like to develop HMI hardware using STM32F746 with 480x272 Graphical LCd, But i have confusion on selection of Graphical LCD?Am i select Graphical LCD with graphic controller or without graphic controller? STM32F746 inbuilt LCD controller.   

[T J]

Posted on February 09, 2018 at 10:20

the easiest way is BuyDisplay 10' Touch RA8876,

it runs on 2x SPI ports.1 SPI for LCD and 1 SPI for Touch.

and leaves your processor running full speed without using the on board LCD controller

https://www.buydisplay.com/default/serial-spi-i2c-10-1-inch-tft-lcd-module-dislay-w-ra8876-optl-touch-panel

 

[Chopra.Deepak]

Posted on February 09, 2018 at 12:32

Hello TJ,

                      thanks for reply,but i would like to develop a product for home automation system ,so i need many GLCD,and also i have general question,because lcd without graphic controller is cheap.

[T J]

Posted on February 10, 2018 at 01:20

The alternative is the 4.3' LCD with touch $23 from china

I paid $35 for an 18' LVDS panel, the drive board I made costs about $15.

[Chopra.Deepak]

Posted on February 10, 2018 at 06:25

Hello TJ,

                  In India 4.3' LCD in INDIA WIthout Controller(like SSD1963) about $18 and with controller $25, do i need display controller or not?Also clear doubt between LCD Controller and LCD Driver.

[T J]

Posted on February 10, 2018 at 07:19

the STM32F7 series have an LCD DRIVE for 8:8:8 RGB panels using about 30 pins.

but it only supports 800x600 about...  and the processor is slow since it is running the LCD 8:8:8 and pixel clock, etc.

however, if you disable the onboard LCD DRIVE, you need an LCD with controller. (and touch, generally)

Yes, the SSD1963 or RA8875 or RA8876, they are all controllers that offload the heavy work from the processor.

The module here is SPI interface,  4.3' Ra8875 with touch $23 from China.

[Chopra.Deepak]

Posted on February 10, 2018 at 08:11

Hello Sir,

               Ok,In SPI mode we also need so much attention of mcu to send data to lcd,then i think send parallel data is better and also i would like to know in 32discovery746 or 769 on board lcd is with separate lcd controller or not,they working fine with good speed.

[T J]

Posted on February 10, 2018 at 09:34

For a Video controller to MCU interface,

Yes, Parallel is faster than SPI,

SPI is too slow for video.

if you don't need all the horse power available, I think those boards are running the RGB 8:8:8 or 5:6:5 interfaces directly on the processor pins.

It is a fast interface.

Quite workable with small LCDs , ie.800x600 max

[Vitaliy Chernobay]

Posted on February 12, 2018 at 19:45

For 800x600 resolution - only RGB control!

For example my project 

https://github.com/golf2109/STM32F746IG-StemWin-800x480

 

[Chopra.Deepak]

Posted on February 13, 2018 at 06:34

Hello Vitaliy,

                         Yes,i knowi,STM32F7xx able to control RGB,but i would like to know GLCD used by you is with inbuilt GLCD Controller or you use STM32F7xx as GLCD Controller?