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

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!

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0 Kilohercas over 11 years ago

do you have LCD with same controller/pinout ?
Right code with wrong init ( set registers for refresh rate, color type, bus type and so on) will produce white screen
Check if RESET is high.
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0 Kilohercas over 11 years ago

do you have LCD with same controller/pinout ?
Right code with wrong init ( set registers for refresh rate, color type, bus type and so on) will produce white screen
Check if RESET is high.
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0 Former Member over 11 years ago in reply to Kilohercas

Hi,

First of all, thanks for your reply, Linas!

I have the STM32F4DIS-LCD which I believe is the one considered for this project so i don't think it should be any problems with the controller/pinout.
I checked that RESET is not high and turned off all optimization but I still have the same behavior from the LCD.

Let me know if you have any additional thoughts to this problem.

Thanks again!
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0 Kilohercas over 11 years ago in reply to Former Member

IF LCD reset Line is LOW, you never get LCD working. some one mentioned bad contacts, also make RESET High after power up at if not by default code, than yourself.
#define LCD_RST_PIN (GPIO_Pin_3)
#define LCD_RST_PORT (GPIOD)

(and you can't use that for your one usage, just for lcd )

Set this pin yourself high before init, and delete same code from lcd init, i don't know why it's not High, it must be. , where is no point to look any further if you have lcd in reset at all time.
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0 Former Member over 11 years ago in reply to Kilohercas

Hi again,

Never mind, I also had bad contact! Reconnected everything after you mentioned that, and now it all works just fine

Sorry for taking your time with such a silly problem, but I really appreciate your help!
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