2011/3/22 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>: > Hi Bastian, > > On Tuesday 22 March 2011 17:11:04 Bastian Hecht wrote: >> Hello omap isp devs, >> >> maybe you can help me, I am a bit desperate with my current cam problem: >> >> I use a ov5642 chip and get only 0x55 in my data output when I use a >> camclk > 1 MHz. With 1 MHz data rate from the camera chip to the omap >> all works (well the colorspace is strange - it's greenish, but that is >> not my main concern). >> I looked up the data on the oscilloscope and all flanks seem to be >> fine at the isp. Very clear cuts with 4 MHz and 10MHz. Also the data >> pins are flickering fine. Looks like a picture. >> >> I found that the isp stats module uses 0x55 as a magic number but I >> don't see why it should confuse my readout. >> >> I use 2592x1944 raw bayer output via the ccdc. Next to the logical >> right config I tried all possible configurations of vs/hs active high >> and low on camera and isp. The isp gets the vs flanks right as the >> images come out in time (sometimes it misses 1 frame). >> >> Anyone of you had this behaviour before? > > How do you capture images ? yavta will fill buffers with 0x55 before queueing > them, so this might indicate that no data is written to the buffer at all. Yes I use yavta. So what does that all mean? As far as I understand things: The isp gets a new frame start. Then it counts up the lines as I receive a vd0 interrupt (I added a printk at the isr). In between the isp doesn't write/dma-transfer any data. I double-checked the pclk-line but I see nice flanks. yavta Output with 4MHz: Device /dev/video2 opened: OMAP3 ISP CCDC output (media). Video format set: width: 2592 height: 1944 buffer size: 10077696 Video format: BA10 (30314142) 2592x1944 2 buffers requested. length: 10077696 offset: 0 Buffer 0 mapped at address 0x4016e000. length: 10077696 offset: 10080256 Buffer 1 mapped at address 0x40b0b000. [ 528.454376] pad_op 4, framix addr: dea0a800 [ 528.462341] s_stream is it! enable: 1 [ 530.026184] last line of image received 0 (0) [-] 0 10077696 bytes 530.213853 1300960526.930187 -0.001 fps [ 531.558898] last line of image received 1 (1) [-] 1 10077696 bytes 531.746555 1300960528.462828 0.652 fps [ 533.091613] last line of image received [ 533.098571] s_stream is it! enable: 0 Captured 2 frames in 3.075627 seconds (0.650274 fps, 6553262.798122 B/s). cheers, 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
