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Problem with "official" LCD software example on STM32F4 Discovery Expansion Board

Former Member

Hi,

 

I've just started to use my STM32F4 discovery expansion board (discovery board, base board, LCD and camera) and as a first shot I want to try out the software examples found here:

 

http://www.element14.com/community/docs/DOC-51670/l/stm32f4dis-bb-discover-more-software-examples

 

I've tried to run the LCD example called "LCD_35T" located in the folder "STM32F4xx_LCD_Example" but ran into some problems...

 

I'm using IAR Embedded Workbench for ARM as my IDE and have performed the following steps:

 

  • Open the project file located in "LCD_35T/EWARM" folder
  • Rebuild all --> Results in a successful build without errors/warnings
  • Download and debug --> Code is flashed and debugger started (using ST-LINK)
  • Running program (Go) --> Expecting LCD to show color bars according to the example but the screen is just white...


Does anyone have an idea what I'm doing wrong?

 

Thanks in advance for all response!

  • 0 in reply to Former Member

    After the looooooooong download it worked o.k.

    Tried the LAN demo but it is > 32k the code limit!  This is where providing a demo preloaded or hex file on the net would be useful to customers.

  • 0

    why do we have to use external driver like SSD1963 when STM32F429 has inbuilt LCD controller ?

  • 0 in reply to Former Member

    Maybe because original board dos not have LTDC controller ? also, it can take a lot of buss time for FMC.

  • 0

    Thanks for the reply.

     

    Do you have any experience in using the LTDC controller in the STM MCUs ? I need a starting point to interface a RGB display 800*480. Most of the exmaples I see interface via SPI or parallel 8-bit mode.

     

    Cheers!

  • 0 in reply to Former Member

    i was able to make it work with 800x480 amoled screen from HTC desire, but it use lot of bus time tu push data, you will only get 5-10 real FPS from your system, due to limitation. So that will cause tearing and other effects on moving objects

     

    Its very simple. first you must use correct SRAM for your frame buffer. Just make your panel as RGB565. Connect all RGB data, VSYNC, HSYNC, PCLK, DE pins to your panel, and use corrcet SPI/I2C init code for your panel, that it. you can download LTDC examples from www.st.com