Difference between revisions of "ODROID"
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==== Wireless Networking ==== | ==== Wireless Networking ==== | ||
Wireless communications seem to be very troublesome, as the network interfaces tend to lose or drop a lot of packages, both in RX and TX, to the point that a reliable SSH connection cannot be established. This happens at least with the "officially supported" wireless NIC (with a Realtek RTL 8191SU chipset). | Wireless communications seem to be very troublesome, as the network interfaces tend to lose or drop a lot of packages, both in RX and TX, to the point that a reliable SSH connection cannot be established. This happens at least with the "officially supported" wireless NIC (with a Realtek RTL 8191SU chipset). | ||
| + | |||
| + | root@odroid:~# ifconfig wlan6 | ||
| + | wlan6 Link encap:Ethernet HWaddr **:**:**:**:**:** | ||
| + | inet addr:192.168.1.60 Bcast:192.168.1.255 Mask:255.255.255.0 | ||
| + | inet6 addr: fe80::ee1a:59ff:fe0e:f122/64 Scope:Link | ||
| + | UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 | ||
| + | RX packets:453 errors:0 dropped:600 overruns:0 frame:0 | ||
| + | TX packets:292 errors:0 dropped:7 overruns:0 carrier:0 | ||
| + | collisions:0 txqueuelen:1000 | ||
| + | RX bytes:79264 (79.2 KB) TX bytes:35116 (35.1 KB) | ||
===== Realtek RTL8192CU ===== | ===== Realtek RTL8192CU ===== | ||
Revision as of 15:54, 19 May 2013
There are two ODROID U2 for development of small robots. Here are details and suggestions for their use.
Contents
Useful How-Tos
- Kernel recompiling process for the ODROID-U2; it is necessary to do this if you ever wish to install external/out-of-tree drivers, as the "official package" is missing several critical kernel headers.
Unresolved issues
Wireless Networking
Wireless communications seem to be very troublesome, as the network interfaces tend to lose or drop a lot of packages, both in RX and TX, to the point that a reliable SSH connection cannot be established. This happens at least with the "officially supported" wireless NIC (with a Realtek RTL 8191SU chipset).
root@odroid:~# ifconfig wlan6 wlan6 Link encap:Ethernet HWaddr **:**:**:**:**:**
inet addr:192.168.1.60 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::ee1a:59ff:fe0e:f122/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:453 errors:0 dropped:600 overruns:0 frame:0
TX packets:292 errors:0 dropped:7 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:79264 (79.2 KB) TX bytes:35116 (35.1 KB)
Realtek RTL8192CU
This chipset seems not to be even detected by the stock HK kernel, but it is possible to use it after recompiling the kernel, disabling the in-kernel module for the NIC, and integrating Realtek's official driver for this chipset inside it (instructions are included in the package).
Tested OS and versions
- Xubuntu 13.04 for armhf architectures, released by HardKernel with their modified Linux kernel, version 3.0.75. The kernel can be recompiled for using 3D video acceleration but this would prevent USB video cameras to work, so it's useless for robot development (even more so since OpenCL can't be even used).
Tested I/O devices
Monitors
Monitors need a native HDMI interface to work with ODROIDs due to the strict requirements of the Exynos system-on-chip; for the same reason, external HDMI-to-DVI adapters are also not recommended, as you could result having a blank image screen (source )
This is a list of monitors and TV screens with native HDMI ports that are known to work.
- Sony KDL-32V4500
- Samsung Syncmaster XL2370 HD
