[OpenWrt-Devel] [PATCH] ar71xx: add support for the UniFi AP Outdoor Plus

[Sergey Ryazanov]

Hello Stefan,

2015-03-16 23:36 GMT+03:00 Stefan Rompf <stefan at loplof.de>:
> However, independant of the channel selected the ports are always set to
> 0x00081405 (or 0x00081404 or 0x00081406 depending on the LED setting):
>
> BZ.v3.2.7# /tmp/io -4 -r 0x18040004
> 18040004:  00081405
>
> If anyone has ideas where else to look, please share. Meanwhile let's see what
> I can do with strace ;-)
>
If they built SPIoverGPIO or I2CoverGPIO or some other serial bus over
GPIO, then you do not see any changes between channel switches. Or
they could use some non GPIO interface to communicate with external
filter (embedded SPI, I2C or even USB or PCI of SoC).

Possibly, you could see some changes during change. Try check GPIO
pins with oscillograph during channel change.

Or you could put device in continuous scan (e.g. use STA mode and
enter some not available SSID to put device for infinite AP search)
and then read GPIO register state in circle. That trick does not
reveal actual protocol, but shows GPIO lines in use, if any.

-- 
Sergey
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