Hi Hugues, On Mon, Jan 08, 2018 at 05:13:39PM +0000, Hugues FRUCHET wrote: > I'm using a ST board with OV5640 wired in parallel bus output in order > to interface to my STM32 DCMI parallel interface. > Perhaps could you describe your setup so I could help on understanding > the problem on your side. From my past experience with this sensor > module, you can first check hsync/vsync polarities, the datasheet is > buggy on VSYNC polarity as documented in patch 4/5. It turns out that it was indeed a polarity issue. It looks like that in order to operate properly, I need to setup the opposite polarity on HSYNC and VSYNC on the interface. I looked at the signals under a scope, and VSYNC is obviously inversed as you described. HSYNC, I'm not so sure since the HBLANK period seems very long, almost a line. Since VSYNC at least looks correct, I'd be inclined to think that the polarity is inversed on at least the SoC I'm using it on. Yong, did you test the V3S CSI driver with a parallel interface? With what sensor driver? Have you found some polarities issues like this? Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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