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When I touch the SCL pin with my finger the SPI works

Question asked by prieur.jean on Sep 11, 2013
Latest reply on Sep 15, 2013 by prieur.jean

I programmed a LCD screen with SPI on a prototype and everything was working fine.

But I mounted
 the screen on the final PCB and now I have a problem: the screen didn't understand the datas I send to it. The screen remains white. Datas are correctly send, I know it because I compare signals with my working prototype.

When I touch with my finger the clock pin, the screen is able to understand datas and works fine.

Do you ever had this problem ? I am sure of the screen connexions and I tested it with different SPI speeds and configurations...

Thanks !