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Fez cobra with 7" unstable image while read and write on SD card


#1

While reading or writing on sd card i got a left shift of the image in the lcd also the image become corrupted for a while.
Lcd operate correctly while using ethernet or usb host.

Any idea ?


#2

There is priority flag that you can set in the LCD configuration


#3

setting lcdConfig.PriorityEnable = false; cause lost of HSYNC
changing :
lcdConfig.HorizontalSyncPulseWidth = 125;
lcdConfig.HorizontalBackPorch = 150;
lcdConfig.HorizontalFrontPorch = 150;
with different value does’nt solve the problem.

is there a possibility to disable lcd output while read and write on SD ?


#4

You need to set priority to true not false.

Now, do you see something odd even with the priority set to true?!

If you do, then can you please provide a simple program to help us see the issue?


#5

Gus you are epic you always online !!! .
Yes before i change priorityflag was true as in your code for 7 ".
i’ll send to you all the application.


#6

We prefer small example showing the problem not full applications as we can’t debug monster apps. Ideally you would post few lines of code right here so other members can try it if they like.


#7

Setting lcdConfig.PixelClockDivider = 8; solve the problem
In the documentation for 7" LCD is set to 4.


#8

Setting lcdConfig.PixelClockDivider = 5 works too with less dimming of filled shapes.


#9

We updated the document to say 5. Thank you.