Hi Bastian, On Wednesday 01 June 2011 10:18:21 Bastian Hecht wrote: > 2011/5/30 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>: > > 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. And the OMAP4 ISS doesn't have a V4L2 driver :-( > >> >> 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 -- 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
