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<title>Sensor Watch: watch-library/shared/watch/watch.h File Reference</title>
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<div id="projectname">Sensor Watch<span id="projectnumber"> 0.0.0</span>
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<div id="projectbrief">A board replacement for the classic Casio F-91W wristwatch, powered by a Microchip SAM L22 microcontroller.</div>
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<li class="navelem"><a class="el" href="dir_f1a087a6659d970f5756e21fc1ac4961.html">watch-library</a></li><li class="navelem"><a class="el" href="dir_3351a3556ab4b770be21f3a77a6d7b80.html">shared</a></li><li class="navelem"><a class="el" href="dir_280ec1f3fe74f12cdd5c78898ed1ca3c.html">watch</a></li> </ul>
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<div class="headertitle"><div class="title">watch.h File Reference</div></div>
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<div class="textblock"><code>#include <stdint.h></code><br />
<code>#include <stdbool.h></code><br />
<code>#include "driver_init.h"</code><br />
<code>#include "watch_app.h"</code><br />
<code>#include "watch_rtc.h"</code><br />
<code>#include "watch_slcd.h"</code><br />
<code>#include "watch_extint.h"</code><br />
<code>#include "watch_led.h"</code><br />
<code>#include "watch_buzzer.h"</code><br />
<code>#include "watch_adc.h"</code><br />
<code>#include "watch_gpio.h"</code><br />
<code>#include "watch_i2c.h"</code><br />
<code>#include "watch_spi.h"</code><br />
<code>#include "watch_uart.h"</code><br />
<code>#include "watch_deepsleep.h"</code><br />
<code>#include "watch_private.h"</code><br />
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<p><a href="watch_8h_source.html">Go to the source code of this file.</a></p>
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Functions</h2></td></tr>
<tr class="memitem:a16023aa6b668de61af59b40b2bee5d1d"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="watch_8h.html#a16023aa6b668de61af59b40b2bee5d1d">watch_is_battery_low</a> (void)</td></tr>
<tr class="memdesc:a16023aa6b668de61af59b40b2bee5d1d"><td class="mdescLeft"> </td><td class="mdescRight">Returns true when the battery voltage dips below 2.5V. <a href="watch_8h.html#a16023aa6b668de61af59b40b2bee5d1d">More...</a><br /></td></tr>
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<tr class="memitem:a6df21baf06b4a5392d95dd3cdde75d94"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="watch_8h.html#a6df21baf06b4a5392d95dd3cdde75d94">watch_is_buzzer_or_led_enabled</a> (void)</td></tr>
<tr class="memdesc:a6df21baf06b4a5392d95dd3cdde75d94"><td class="mdescLeft"> </td><td class="mdescRight">Returns true if either the buzzer or the LED driver is enabled. <a href="watch_8h.html#a6df21baf06b4a5392d95dd3cdde75d94">More...</a><br /></td></tr>
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<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a16023aa6b668de61af59b40b2bee5d1d">◆ </a></span>watch_is_battery_low()</h2>
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<p>Returns true when the battery voltage dips below 2.5V. </p>
<p >A CR2016 battery will have a nominal voltage between 2.9 and 3 volts for most of its lifespan. Once the battery discharges to about 60%, the voltage will drift slightly lower; this may manifest as a dimmer LED. By the time the battery voltage has fallen to 2.5 volts, it will have probably less than 10% of its capacity remaining, and you can expect the voltage to drop relatively quickly as the battery dies. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a6df21baf06b4a5392d95dd3cdde75d94">◆ </a></span>watch_is_buzzer_or_led_enabled()</h2>
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<p>Returns true if either the buzzer or the LED driver is enabled. </p>
<p >Both the buzzer and the LED use the TCC peripheral to drive their behavior. This function returns true if that peripheral is enabled. You can use this function to determine whether you need to call the watch_disable_leds or or watch_enable_buzzer functions before using these peripherals. </p>
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