Difference between revisions of "10393 manual"

Revision as of 19:04, 4 August 2016

Connections

• Connect sensors to system board - FPC cables are not symmetrical
• Ports:

• Power supply

Defaults

IP addr: 192.168.0.9 (old: 192.168.0.8)

user / pwd: root / <empty>

• (current) The address is set in the /etc/init_elphel393.sh in rootfs.
• (old) The address is set in the init_elphel393.sh script on the card's FAT32 partition.

init_elphel393.sh

• /etc/init_elphel393.sh
• Change SENSOR_TYPE (boots but no images if incorrectly set):
  • SENSOR_TYPE=5 - for 5MPix sensors
  • SENSOR_TYPE=14 - for 14MPix

NOTE: 5 & 14 MPix sensors cannot be mixed - require different bitstreams.

• Change the default IP address

Boot

• [default behavior] on power-on the camera boots from NAND flash: u-boot, device tree and kernel.

devicetree has "chosen = ...root=/dev/mmcblk0p2..." - rootfs is on the micro SD card second partition. Thus, the μSD card must be inserted.

• boot from μSD card only options:
  • A modified card that doesn't lock the mechanical CD pin in the slot - it's done by carefully rubbing down the corner (see Fig.2) - most cards have circuitry there and get damaged.
  • μUSB-to-USB cable: in Linux compile this driver, connect camera to PC, reload the driver then type:

./cp210x_gpio.py 0x6;
./cp210x_gpio.py 0xe;

Fig.2 Recovery μSD card ('cut' corner) - enforces the system board to boot from it

Command line access

ssh root@192.168.0.9

Serial console access

• Use a microUSB-USB cable to connect to PC - the cable's end should be thin enough otherwise interferes with the micro SD card.

• Linux: minicom -c on
  • likely device: /dev/ttyUSB0
  • settings: 115200 8N1, no for hardware/software flow control

Get images

channel 1: http://192.168.0.9:2323/img

channel 2: http://192.168.0.9:2324/img

channel 3: http://192.168.0.9:2325/img

channel 4: http://192.168.0.9:2326/img

Video

Display

gst-launch-1.0 souphttpsrc is-live=true location=http://192.168.0.9:2323/mimg ! jpegdec ! xvimagesink

• Only mjpeg, no rtsp yet.
• More examples at Using GStreamer

Record

• More info
• If the prefix parameter, which is absolute path + prefix, for a channel is not set the file will be written somewhere to rootfs (likely /usr/local/verilog/)

browser

Example 1: (provide a correct media mount point)

Example 2:

http://192.168.0.9/camogm.php?chn=0&cmd=prefix=/mnt/sda1/;

http://192.168.0.9/camogm.php?chn=0&cmd=start;

http://192.168.0.9/camogm.php?chn=0&cmd=stop;

command line

Example:

echo "format=mov;status=/var/tmp/camogm2.status;prefix=/home/root/test_;duration=600;length=1073741824;start" > /var/volatile/camogm_cmd2

echo "stop" > /var/volatile/camogm_cmd2
sync

Change parameters

• http://192.168.0.9/controls.html - previews and basic parameters:
  • Exposure - the values are in the sensor lines. Currently conversion to seconds is not correct.
  • WB - r,g,b gains
  • Quality - compression quality - individual for compressor but common for the buffer driver - it's better to have the same value for all channels.

• For 5MPix the startup settings are defined int the /usr/local/verilog/startup5 on the micro SD card, FAT32 partition:

...
-c write_sensor_i2c  all 1 0 0x9009001e (exposure)
-c write_sensor_i2c  all 1 0 0x9035000a (set all gains to 0xa)
-c write_sensor_i2c  all 1 0 0x902c000e (blue gain to 0xe)
-c write_sensor_i2c  all 1 0 0x9009001d (red gain to 0xd)
...

Temperature monitor

• http://192.168.0.9/hwmon.html:
  • T_shutdown - automatic shutdown temperature level

Proper shutdown

• if not properly shutdown - μSD might get corrupted (run sync at least)

shutdown -hP now

Firmware image

• 20160804 (new)
  • root/pass
  • overlayfs enabled if rootfs is on flash - lower: /tmp/rootfs.ro, upper: /tmp/rootfs.rw - changes to the filesystem are made on:

reboot -f

or

shutdown -Hp now

or (most likely will work but correct work is not guaranteed)

overlay_sync 

• 20160626 (old)
  • python scripts moved to /tmp - dependencies create pycs
  • init_elphel393.sh moved from μSD card to /etc in rootfs - boot from flash doesn't require an inserted card for fixed boards.
  • default IP address changed to 192.168.0.9 as in the image built from our repositories.
• 20160622 (old)
• 20160614 (old)
• 20160607 (old)
• 20160601 (old)
• 20160526 (old)
• 20160524 (old)
• 20160519 (old)

Known problems

• [solved] Vertical artifacts in jpegs. Images are ok at 100% quality. Fixed, testing.
• http://192.168.0.9:232x/noexif/mimg - multipart jpeg displays corrupted frames from time to time. Reason: network bandwidth?
• [solved] Sometimes on power-on (NAND flash boot) cannot mount the card's rootfs partition. Kernel Panics. Power off/on. Soft "reboot -f" works ok.

...
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)
...

More info

• Changing exposure/quality/gains - can corrupt images - needs testing.

• After rewriting rootfs to μSD card - some of the cards get a corrupted partition - re-partitioning (reformatting?) solves the problem.

On the camera the rootfs is mounted as RW and some of the files are changed (also links created) -
most of the changes are now moved to tmpfs but something might have been missed.

Notes

• In case rootfs is on flash, it might make sense (or maybe not as the history is updated only once on session exit) to disable bash sessions command history - disable bash history