mtk硬件启动关闭蓝牙功能的项目：mtk 上层操作GPIO应用示例

mtk硬件启动关闭蓝牙功能的项目：mtk上层操作GPIO应用示例

项目要求：

接上篇：

1：蓝牙按键（KCOL2+KROW1)长按3秒，软件上控制GPIO144拉高2秒后关闭，蓝牙就开启并搜索配对。同时拉高GPIO98，控制音频的模拟开关切换蓝牙音源。

2：蓝牙在工作状态下，给出个1.8V的高电平，给GPIO145用来检测蓝牙的工作状态。

3：蓝牙在工作装态下想要重新配对，在长按蓝牙按键3秒，控制GPIO97拉高3秒后关闭，蓝牙模块在收到这个信号后执行清空列表和重新搜索功能。

4：蓝牙按键（KCOL2+KROW1)长按8秒，软件上控制GPIO144拉高2秒后关闭，蓝牙模块就关闭了。

本篇讲述如何控制。

1,
设置蓝牙控制GPIO为初始状态，GPIO97 98 144全部设置为GPIOOUT，且下拉。GPIO145设置为GPIOIN。

2，侦测开机事件boot_completed，在这个intent处理程序中，检查bt的switched的状态，如果为//checked状态，那么打开蓝牙，如果为非checked状态，则不理会。

第一步，在AndroidManifest.xml中添加：

<receiverandroid:name="BootCompletedReceiver">

<intent-filter>

<actionandroid:name="android.intent.action.BOOT_COMPLETED"/>

</intent-filter>

</receiver>

在当前包下面建立BootCompletedReceiver.java文件

我们定义两个SharedPreferences来保存系统的bt和ethernet状态，因为省电需求，我们每次开机都保持Ethernet和BT为关闭。

packagecom.mediatek.oobe;

importandroid.app.Activity;

importandroid.content.BroadcastReceiver;

importandroid.content.Context;

importandroid.content.Intent;

importandroid.content.SharedPreferences;

importandroid.util.Log;

publicclassBootCompletedReceiver
extendsBroadcastReceiver
{

@Override

publicvoidonReceive(Context
mContext, Intent arg1) {

Log.e("zcfdebug","wewill
set BT and ethernet default to off!");

SharedPreferencesbtSwitchSharedPreferences=mContext.getSharedPreferences("OOBE_Settings",Activity.MODE_PRIVATE);

SharedPreferences.EditormEditor=btSwitchSharedPreferences.edit();

mEditor.putString("btSwitch","0");

mEditor.putString("eth0Switch","0");

}

//在这个类里面，我们要检测蓝牙的当前设置是否为开或者关。

3,我们打开图形界面，显示以太网卡开关和蓝牙开关的时候，需要根据这里的SharedPreferences来决定开关显示状态，这个需要在开关的Enable类的初始化完成：

在蓝牙的BtEnabler类里面增加三个私有成员

privateSharedPreferences
btSwitchSharedPreferences;

privateString
btSwitchStatusString;

privateSharedPreferences.Editor
mEditor;

在Enable类的初始化函数中间根据SharedPreferences的状态设置UISwitch开关状态。

publicBtEnabler(Context
context, Preference switchPref) {

mContext=
context;

mBtSwitchPre=
(SwitchPreference) switchPref;

//mBtSwitchPre.setChecked(false);

booleanret=
EmGpio.gpioInit();

btSwitchSharedPreferences=context.getSharedPreferences("OOBE_Settings",Activity.MODE_PRIVATE);

btSwitchStatusString=btSwitchSharedPreferences.getString("btSwitch",null);

mEditor=btSwitchSharedPreferences.edit();

if(btSwitchStatusString=="0"){

mBtSwitchPre.setChecked(false);

}elseif(btSwitchStatusString=="1"){

mBtSwitchPre.setChecked(true);

}else{

mBtSwitchPre.setChecked(false);

}

在用户打开关闭蓝牙的处理函数中间，进行SharedPreferences的设置

OnPreferenceChangeListenermBtPreferenceChangeListener=
newOnPreferenceChangeListener()
{

@Override

publicbooleanonPreferenceChange(Preference
preference, Object newValue) {

//TODOAuto-generated
method stub

booleanisChecked
= (Boolean) newValue;

if(isChecked){

mEditor.putString("btSwitch","1");

}else{

mEditor.putString("btSwitch","0");

}

setBtEnable(isChecked);

}

returntrue;

}

};

对于以太网，因为其他程序也会进行设置，所以，这里也是类似操作。

（注意，为了系统省电的操作，我们没有使用系统所提供的EthernetManager的开关，而是直接关闭电源）

4,接收系统发出的android.intent.action.onkey.BT_START

第一步，在AndroidManifest.xml中添加：

<receiverandroid:name="BtStartReciver">

<intent-filter>

<actionandroid:name="android.intent.action.onkey.BT_START"/>

</intent-filter>

</receiver>

在当前包里面建立BtStartReciver.java，内容如下

packagecom.mediatek.oobe;

importandroid.app.PendingIntent;

importandroid.content.BroadcastReceiver;

importandroid.content.Context;

importandroid.content.Intent;

importandroid.util.Log;

public classBtStartReciver extends BroadcastReceiver {

@Override

public voidonReceive(Context mContext, Intent arg1) {

Log.e("zcfdebug","wewill set BT according preference!");

}

在这里文件里，我们将按照项目要求，如果当前蓝牙处于关的状态，则打开蓝牙。否则，不理会。

蓝牙开关状态保存在设置界面中，而且第一次开机必须为关闭状态。

首先我们读取蓝牙的SharedPreferences，判断当前的BT是否为关闭状态，如果是，那么打开蓝牙，并且更新SharedPreferences。代码如下：

packagecom.mediatek.oobe;

importcom.mediatek.engineermode.io.EmGpio;

importandroid.app.Activity;

importandroid.app.PendingIntent;

importandroid.content.BroadcastReceiver;

importandroid.content.Context;

importandroid.content.Intent;

importandroid.content.SharedPreferences;

importandroid.util.Log;

publicclass BtStartReciver extends BroadcastReceiver {

privateSharedPreferences btSwitchSharedPreferences;

privateString btSwitchStatusString;

privateSharedPreferences.Editor mEditor;

@Override

publicvoid onReceive(Context mContext, Intent arg1) {

Log.e("zcfdebug","wewill set BT according preference!");

btSwitchSharedPreferences=mContext.getSharedPreferences("OOBE_Settings",Activity.MODE_PRIVATE);

btSwitchStatusString=btSwitchSharedPreferences.getString("btSwitch",null);

mEditor=btSwitchSharedPreferences.edit();

if(btSwitchStatusString=="0"){

// mBtSwitchPre.setChecked(false);

mEditor.putString("btSwitch","1");

setBtEnable(true);

}

privatevoid setBtEnable(boolean isChecked){

EmGpio.setGpioOutput(144);

EmGpio.setGpioOutput(98);

if(isChecked){

newThread(new Runnable() {

publicvoid run() {

Log.e("zcfdebug","weset GPIO 144 and 98 high");

EmGpio.setGpioDataHigh(144);

EmGpio.setGpioDataHigh(98);

Log.e("zcfdebug","wewill pull 144 2senconds");

try{

Thread.sleep(2000);

}catch (InterruptedException e) {

//TODO Auto-generated catch block

e.printStackTrace();

}

Log.e("zcfdebug","wewill pull 144 down");

EmGpio.setGpioDataLow(144);

}

}).start();

}else{

newThread(new Runnable() {

publicvoid run() {

Log.e("zcfdebug","weset GPIO 144 high and 98 low");

EmGpio.setGpioDataHigh(144);

EmGpio.setGpioDataLow(98);

Log.e("zcfdebug","wewill pull 144 2senconds");

try{

Thread.sleep(2000);

}catch (InterruptedException e) {

//TODO Auto-generated catch block

e.printStackTrace();

}

Log.e("zcfdebug","wewill pull 144 down");

EmGpio.setGpioDataLow(144);

}

}).start();

}

4,接收系统发出的android.intent.action.onkey.BT_STOP

与上面的Start方法一样的，就不累述。

5，上面的GPIO操作才有的mtk提供的方式，jni方法集成在系统so文件中libem_gpio_jni.so

其接口代码如下EmGpio.java：

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