Android(4.2) Sensors 学习——G-sensor,Gyroscope驱动移植

雨点打透心脏的1/2处 2022-09-20 15:07 122阅读 0赞

本人对驱动可谓是一点不懂，鉴于公司目前高驱动的人手不够，所以我也只能两眼一抹黑硬上咯，最原来Android 4.1上的正常使用的驱动完整的移植到Android 4.2上。这篇文件讲记录自己一步一步移植过程，已备不时之需。在移植前，先来高明白android 支持那些Sensors，即Sensors种类和功能。

### Sensors 种类和功能 ###

从Android 官方的API可以找到Android 支持的sensor类型如下：

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   <th style="padding:4px 12px; vertical-align:top; background-color:rgb(153,153,153); color:rgb(255,255,255); border:1px solid rgb(221,221,221); font-weight:normal"> 类型</th> 
   <th style="padding:4px 12px; vertical-align:top; background-color:rgb(153,153,153); color:rgb(255,255,255); border:1px solid rgb(221,221,221); font-weight:normal"> 描述</th> 
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   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> <code style="font-size:13px; color:rgb(0,102,0); line-height:14px; margin-bottom:0px">ACCELEROMETER&nbsp; （加速度传感器）&nbsp;&nbsp;</code></td> 
   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> 又名G-sersor，侦测物体的加速度，利用装置内配置的两个电容点，并在电容点之间放置一个导电且可晃动物质，通过侦测导电物质的移动改变电容点间的电压，借此计算感应器的状态。</td> 
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   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> <code style="font-size:13px; color:rgb(0,102,0); line-height:14px; margin-bottom:0px">&nbsp;GRAVITY<br> （重力传感器）<br> </code></td> 
   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> 又名GV-sensor<code style="font-size:13px; color:rgb(0,102,0); line-height:14px"><a href="http://developer.android.com/reference/android/nfc/NfcAdapter.html#ACTION_TECH_DISCOVERED" style="color:rgb(37,138,175); text-decoration:none; margin-bottom:0px" rel="nofollow"></a></code><span style="margin-bottom:0px">。</span></td> 
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   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> &nbsp; &nbsp;<span style="color:rgb(0,102,0); font-family:monospace; font-size:13px; line-height:14px">GYROSCOPE</span><br> &nbsp; (<span style="color:rgb(0,102,0); font-family:monospace; font-size:13px; line-height:14px">陀螺仪传感器)</span></td> 
   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> 又名Gyro-sensor角速度器，利用内部震动机械结构侦测物体转动所产生的角速度，进而计算出物体移动的角度。侦测水平改变的状态，但无法计算移动的激烈程度。</td> 
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   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> &nbsp; &nbsp;&nbsp;<span style="color:rgb(0,102,0); font-family:monospace; font-size:13px; line-height:14px">LIGHT</span><br> <span style="color:rgb(0,102,0); font-family:monospace; font-size:13px; line-height:14px">（光线传感器）</span></td> 
   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> 侦测光线的强弱</td> 
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   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> MAGNETIC_FIELD<br> (磁力传感器)</td> 
   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> 又名M-sensor。</td> 
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   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> PRESSURE<br> (压力传感器)</td> 
   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> 返回当前的压强。</td> 
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   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> <span style="line-height:14px"><span style="font-family:SimSun">PROXIMITY<br> (距离传感器)</span><br> </span></td> 
   <td style="padding:4px 12px; vertical-align:top; background-color:inherit; border:1px solid rgb(221,221,221)"> 侦测物体与传感器之间的距离。</td> 
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   <td style="border-style:solid; border-color:rgb(221,221,221); padding:4px 12px; vertical-align:top; background-color:inherit"> HUMIDITY<br> (湿度传感器) &nbsp;</td> 
   <td style="border-style:solid; border-color:rgb(221,221,221); padding:4px 12px; vertical-align:top; background-color:inherit"> 返回当前的湿度 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</td> 
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   <td style="border-style:solid; border-color:rgb(221,221,221); padding:4px 12px; vertical-align:top; background-color:inherit"> ROTATION<br> (方向传感器)</td> 
   <td style="border-style:solid; border-color:rgb(221,221,221); padding:4px 12px; vertical-align:top; background-color:inherit"> 又名O-sensor</td> 
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   <td style="border-style:solid; border-color:rgb(221,221,221); padding:4px 12px; vertical-align:top; background-color:inherit"> <span style="line-height:14px"><span style="font-family:SimSun">TEMPERATURE<br> (温度传感器)</span><br> </span></td> 
   <td style="border-style:solid; border-color:rgb(221,221,221); padding:4px 12px; vertical-align:top; background-color:inherit"> 返回当前的温度</td> 
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以上加速度传感器，重力传感器，陀螺仪传感器，光线传感器 是Android中最长用的Sensor了。下面介绍下G-sensor,Gyroscope驱动的移植。

### G-sensor驱动code  ###

通过咨询硬件同事，知道我们当前用的G-sensor是LSM303D，Gyroscope是L3GD2。接下来按照这两个关键grep查找。结果找到如下的驱动相关的文件：