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=== How do I know whether my activity is running on a physical XO? ===
=== How do I know whether my activity is running on a physical XO? ===
Sugar runs on ordinary computers as well as on XO's. While your activity is typically going to be run on a real XO, some people will indeed run it elsewhere. Normally you shouldn't write your activity to care whether it's on an XO or not. If for some odd reason, you need to care, the easiest way to tell if you are on a physical XO is to check whether /sys/power/olpc-pm, an essential power management file for the XO, exists. <ref>[http://lists.laptop.org/pipermail/devel/2008-June/015923.html reliably detecting if running on an XO]</ref> <ref>OLPC [[Power Management Interface]]</ref>
Sugar runs on ordinary computers as well as on XO's. While your activity is typically going to be run on a real XO, some people will indeed run it elsewhere. Normally you shouldn't write your activity to care whether it's on an XO or not. If for some odd reason, you need to care, the easiest way to tell if you are on a physical XO is to check whether /sys/power/olpc-pm, an essential power management file for the XO, exists. <ref>[http://lists.laptop.org/pipermail/devel/2008-June/015923.html reliably detecting if running on an XO]</ref> <ref>OLPC [[olpc:Power Management Interface]]</ref>
<pre>
<pre>
The gobject.timeout_add() function allows you to invoke a callback method after a certain amount of time. If you want to repeatedly call a method, simply keep invoking the gobject.timeout_add function in your callback itself. The code below is a simple example, where the callback function is named repeatedly_call. Note that the timing of the callbacks are approximate. To get the process going, you should make an initial call to repeatedly_call() somewhere in your code.
The gobject.timeout_add() function allows you to invoke a callback method after a certain amount of time. If you want to repeatedly call a method, simply keep invoking the gobject.timeout_add function in your callback itself. The code below is a simple example, where the callback function is named repeatedly_call. Note that the timing of the callbacks are approximate. To get the process going, you should make an initial call to repeatedly_call() somewhere in your code.
You can see a more substantive example of this pattern in use when we [[Pango#How_do_I_dynamically_set_the_text_in_a_pango_layout.3F | regularly update the time displayed on a pango layout object]].
You can see a more substantive example of this pattern in use when we [[olpc:Pango#How_do_I_dynamically_set_the_text_in_a_pango_layout.3F | regularly update the time displayed on a pango layout object]].
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There are several pages that give you instructions on how to install/update your current build.
There are several pages that give you instructions on how to install/update your current build.
* If you already have a working build installed and an internet connection, first try [[olpc-update]].
* If you already have a working build installed and an internet connection, first try [[olpc:olpc-update]].
* If that doesn't work, you can look at instructions for an [[Activated upgrade]] that can be done via USB] boot.
* If that doesn't work, you can look at instructions for an [[olpc:Activated upgrade]] that can be done via USB] boot.
As the instructions on the pages linked above note, make sure to install your activities separately after you have upgraded to a specific base build.
As the instructions on the pages linked above note, make sure to install your activities separately after you have upgraded to a specific base build.
=== I am developing on an XO laptop, but my keyboard and language settings are not ideal. How can I change them? ===
=== I am developing on an XO laptop, but my keyboard and language settings are not ideal. How can I change them? ===
Internationalized laptops will often have settings that might slow you down while developing. To change around the language settings so you can better understand environment messages, use the [[Sugar Control Panel]]
Internationalized laptops will often have settings that might slow you down while developing. To change around the language settings so you can better understand environment messages, use the [[olpc:Sugar Control Panel]]
Keyboard settings on internationalized laptops<ref>[[Keyboard layouts#OLPC keyboard layouts]]</ref> can also be suboptimal, especially as characters like "-" and "/" are in unfamiliar positions. You can use the <tt>setxkbmap</tt> command in the [[Terminal Activity]] to reset the type of keyboard input used and then attach a standard U.S. keyboard that will allow you to type normally. The command below sets the keyboard to the US mapping (it will reset to the default internationalized mapping upon restart).
Keyboard settings on internationalized laptops<ref>[[olpc:Keyboard layouts#OLPC keyboard layouts]]</ref> can also be suboptimal, especially as characters like "-" and "/" are in unfamiliar positions. You can use the <tt>setxkbmap</tt> command in the [[olpc:Terminal Activity]] to reset the type of keyboard input used and then attach a standard U.S. keyboard that will allow you to type normally. The command below sets the keyboard to the US mapping (it will reset to the default internationalized mapping upon restart).
setxkbmap us
setxkbmap us