I am trying to grab data from the OV2640 using SAM9G20. When the sensor is configured to produce image in the YUV uncompressed format, ISI captures image correctly.
But this sensor has JPEG encoder and can output compressed data to ISI. The main question is: can ISI capture JPEG-compressed data in principle?

The datasheet of SAM9G20 is very poor in the ISI section, and I can't understand what event will produce "end of capture" interrupt: beginning of next frame (by VSYNC) or the number of pixels stored in memory? Seems to be second, and that's why several JPEG frames will be stored in one with the lost of data in last frame...

I'll try to put the question more broadly: did anyone try to connect the camera with JPEG output to any of the AT91 chip with ISI module?
Please share your experience

Hi,

I am trying to get a picture ussing the ADV7180 chip with 9g20, but now I am stuck...

the ISI driver gets initialized

Linux video capture interface: v2.00
atmel_isi atmel_isi: Reading configuration
atmel_isi atmel_isi: video buffer: 155648 bytes at ffced000 (phys 21940000)
atmel_isi atmel_isi: video buffer: 155648 bytes at ffd13000 (phys 21980000)
atmel_isi atmel_isi: video buffer: 155648 bytes at ffd39000 (phys 219c0000)
atmel_isi atmel_isi: video buffer: 155648 bytes at ffd5f000 (phys 21b00000)
atmel_isi atmel_isi: capture buffer: 962560 bytes at ffc02000 (phys 0x21a00000)
atmel_isi atmel_isi: Atmel ISI V4L2 device at 0xfffc0000

But if I use the capture app on
http://mirror.egtvedt.no/avr32linux.org ... lIsiDriver

I get

Failed to open video device: Invalid argument
root@OpenWrt:/# Jan 1 00:02:14 OpenWrt user.debug kernel: atmel_isi_capture: unknown ioctl ' error -22

same with ffmpeg:

ffmpeg -s qcif -r 30 -t 20 -pix_fmt yuyv422 -f video4linux2 -i /de
v/video0 temp_vid.avi
[video4linux2 @ 0x2a430]Cannot open video device /dev/video0 : Invalid argument
/dev/video0: I/O error occurred
Usually that means that input file is truncated and/or corrupted.


Can you share your experiance on getting a picture When the sensor is configured to produce image in the YUV uncompressed format?

Thanks,
lhrossouw