View source for CM-QS600: Android: Operating instructions

= Overview =
Most CM-QS600 [http://compulab.co.il/products/operating-systems-and-drivers-for-cm-qs600-and-sbc-qs600 supported features] are operated using normal Android controls.<br/>
This page contains information about features and services, which are less straight-forward to operate, or are less widely known.

= Operating instructions =
=== Automatic suspend when inactive ===
By default, CM-QS600 is configured to stay awake while connected to the power.<br/>
In order to change this behavior, proceed to '''Settings'''->'''Developer options''', uncheck '''Stay awake ... while charging''' to enable the device going to suspended state.
{{Note|If '''Developer options''' item is hidden, re-introduce it proceeding to '''Settings'''->'''About tablet''' and clicking on '''Build number''' 7 times consequently.}}

=== Start-up script ===
'''/system/etc/startup-svc.sh''' script is run upon system boot by Android ''init'' process with ''root'' permissions.<br/>
As ''system'' partition is mounted 'read-only', one should remount ''system'' 'rw', prior to attempting to edit the script.

=== Networking ===
Normal Android behavior is to prioritize network interfaces (in descend order):
* Ethernet
* Wi-Fi
* 3G
Whenever higher-priority network interface is available, the lower-priority interfaces will be torn down.

=== (Optional) 3G Modem ===
In case '''Telit HE910-XX''' 3G modem is installed, it will be detected automatically, by start-up service, with no additional action required.<br/>

=== Audio sink selection ===
CM-QS600 may use either '''HDMI''' or '''analog''' audio device.
Audio sink selection should be done with a designated application, e.g. ''SoundAbout'', available via Google Play Store.

{| class="wikitable" border="1" cellspacing="0"
! audio device
! sink name
|-
| HDMI
| Aux Digital (HDMI)
|-
| analog
| Wired Headphones
|}

{{Note|If after making the selection with ''SoundAbout'' nothing happens, restart the application.}}

=== P9 header ===
* SPI.0
: By default, SPI.0 is routed to the P9 header:
: pin 1 : Clk
: pin 3 : nCS
: pin 5 : MOSI
: pin 7 : MISO

* UART (<code> /dev/ttyHSL1 </code>)
: In order to override the default routing, the kernel should be [[CM-QS600: Android: Building from source code#Build_boot_image_.28kernel_.2B_initramfs.29 | rebuilt]] with patched CM-QS600 board file (<code> kernel/arch/arm/mach-msm/board-cm-qs600.c </code>):
<pre>
- #define CM_QS600_GSBI4_AS_SPI
+ // #define CM_QS600_GSBI4_AS_SPI
</pre>
UART routing to the P9 header:
: pin 5 : TX
: pin 7 : RX

[[Category:Android]]
[[Category:CM-QS600]]