STM32F407 with character LCD not working

[selin_2013]

Hi,
I have connected a standard character LCD to a STM32F407, running at 168 MHz. The LCD is blank, not working.
If I slow down the cpu clock, at 16 MHz for example, the LCD starts to display characters .....
The serial ports are working correctly at any cpu speed, so i think the clock parameters are ok.
The signals to LCD (seen with a scope) are clear, only a lot faster at 168 MHz.
Is the LCD library not taking in account the cpu speed?

Thanks for your attention

[petar.timotijevic]

Hi,

Please see compiler source code example for LCD with STM32F107VC @ 70MHz:
C:\Program Files (x86)\Mikroelektronika\mikroBasic PRO for ARM\Examples\ST\Extra Boards\Lcd

You can make code modifications for STM32F407, in project settings you can load configuration scheme for STM32F407.

Check project settings and oscillator options.


Best regards,
Peter

[y0g1]

does your problem is solved??
I am facing the same problem even at 16mhz and 8mhz blank lcd

[darko.ilijevski]

Hi,
Take a look here :

viewtopic.php?f=185&t=70429&p=283937#p283937