Conversion of LCD to VGA
July 27, 2006 11:46 AM Subscribe
ElectricalEngineerFilter: I have an Intel XScale processor (on a gumstix
, with integrated LCD controller. I think I've rigged up a way for it to output a VGA signal. Will you reality check my work?
posted by Netzapper to technology (8 answers total)
In active mode, I note that the LCD controller puts out both a line clock signal, a frame clock signal, and a pixel clock signal. It produces 16-bit digital color information via a parallel interface.
The line clock seems to correspond to the HSync of VGA, while the frame clock seems to correspond to VSync. I can also get analog RGB values by DACing the color signals, using the pixel clock to pump the DAC.
With analog RGB values, an HSync, and a VSync, I have VGA.
(Note: I can, through software, vary the timings, add delays, etc.)