Shifting graphics.spin video image to the left (centering). Is it possible?

Alexis64

Hi,

I have a small problem with some new LCDs on a project I am doing... I am using Graphics.spin and while it all works fine, The image on the LCD is not centered (horizontally). This is (i am sure) a problem with the LCDs but since they do not have an easy way to adjust the horizontal position, and before i take them apart to start swapping resistors, I was wondering if there is a simple way to patch graphics.spin to shift the image to the left a few pixels (see attached picture).

Thank you guys,

Alex

kwinn

You could try adjusting the number of pixels of the horizontal front and back porch ( hf and hb in the vga drivers ). To keep the timing the same you need to subtract 'x' pixels from the front porch and add 'x' pixels to the back porch. Judging by the image you have start by making 'x' about 25% of the current front porch value.

Alexis64

I am actually using the TV object - but your comment made me think and than it all made sense... In the TV object there is a parameter to set the horizontal offset 'doh! ...

Setting tv_ho:=-70 just after the object initialization fixed and centered the screen perfectly ..

Thank you for your help...

Alex

kwinn

Happy to be of help. That's a very nice looking display on your project. Good luck with it.