2011/5/30 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>: > Hi Bastian, > > On Monday 30 May 2011 23:39:13 Bastian Hecht wrote: >> 2011/5/30 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>: >> > 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. > > Chapter 6 starts with the following disclaimer: > > "NOTE: This chapter gives information about all modules and features in the > high-tier device. To check availability of modules and features, see Section > 1.5, AM/DM37x Family, and the device-specific data manual. In unavailable > modules and features, the memory area is reserved, read is undefined, and > write can lead to unpredictable behavior." > > And if you look at table 1-3 on page 195, the CSI2 receivers are not > supported. OK, that potentially saved me tons of work! I saw that the omap4 has 2 csi2 interfaces (and I checked this note :). Unfortunately the panda board only leads out 1 csi2 channel. >> >> 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"? :) > > I haven't personally tried it, but 10fps doesn't sound impossible to reach > with external triggers. Nice. > -- > Regards, > > Laurent Pinchart > Thanks, Bastian Hecht -- 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
