Hello Laurent, 2011/5/30 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>: > Hi Bastian, > > On Sunday 29 May 2011 15:27:23 Bastian Hecht wrote: >> Hello Laurent, >> >> I'm on to a project that needs two synced separate small cameras for >> stereovision. >> >> I was thinking about realizing this on an DM3730 with 2 aptina csi2 >> cameras that are used in snapshot mode. > > As far as I know, the DM3730 doesn't have CSI2 interfaces. If I don't mix up datasheets, it is stated very clearly that 2 csi2 interfaces are supported. I took the datasheet at http://www.ti.com/litv/pdf/sprugn4k declared as AM/DM37x Multimedia Device Technical Reference Manual (Silicon Revision 1.x) (Rev. K) (PDF 26851 KB). "The camera ISP implements three receivers which are named CSI2A, CSI1/CCP2B, and CSI2C. The CSI2A and CSI2C are MIPI D-PHY CSI2 compatible." on page 1070. >> The questions that arise are: >> >> - is the ISP driver capable of running 2 concurrent cameras? > > Yes it can, but only one of them can use the CCDC, preview engine and resizer. > The other will be captured directly to memory as raw data. You could capture > both raw streams to memory, and then feed them alternatively through the rest > of the pipeline. Whether this can work will depend on the image size and frame > rate. Ok I will check if it is sufficient to do any conversions on the cpu. >> - is it possible to simulate a kind of video stream that is externally >> triggered (I would use a gpio line that simply triggers 10 times a >> sec) or would there arise problems with the csi2 protocoll (timeouts >> or similar)? > > I don't think there will be CSI2 issues (although I'm not an expert there) if > you trigger the sensors externally. Nice, when the ISP side is probably no problem - do you have any experience with snapshot mode and know if cameras are capable of doing it at framerates about 10fps? It is just because snapshot mode sounds like taking 1 frame every now and then... can't they call it "trigger mode"? :) A million thanks for your answer, Bastian Hecht > -- > Regards, > > Laurent Pinchart > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
