Hi Bin, > Do you know what is the usb throughput required in your test case? for > example image format, resolution, frame rate? Is the usb data transfer > bulk or isoch? Yes, the image format is 640 x 480 The camera can run up to 30fps, although I do not need it and set up it to 5 The Usb data transfer is "bulk" Regards Josep M. On Fri, Oct 19, 2018 at 8:01 PM Bin Liu <b-liu@xxxxxx> wrote: > > On Fri, Oct 19, 2018 at 07:48:20PM +0200, Josep M. Mirats Tur wrote: > > Hi, > > > > Yes, this would be the link: > > http://shop-orbbec3d-com.3dcartstores.com/Astra-Mini_p_40.html > > Okay, It is about $160, a bit more than my bugdet... > > > In the meanwhile I'll check my application with other board. > > > > Do you think there might be a problem with the processor frequency? > > I've also crossing e-mails with ORBBEC engineers, and their only > > answer has been to suggest using an ARM processor capable of 1.8GHz > > Beagle is capable of 1GHz > > But I can not see why is this so important as long as USB is well > > synchronized and interrupts and driver work well. (Actually I'm not > > familiar with ARM USB system, is just intuition) > > I guess the cpu clock requirement is only to ensure the whole system is > capable to process the usb packets, depending on the image resolution, > fps, and any other data processing. But lower cpu clock shouldn't cause > such problem that the usb controller generates rx interrupt but fifo has > no usb packet. If ARM cannot keep up, which doesn't send IN requests on > time, the camera should just drop data. > > Do you know what is the usb throughput required in your test case? for > example image format, resolution, frame rate? Is the usb data transfer > bulk or isoch? > > Regards, > -Bin.
