Android ADK USB 控制 Arduino LED 开关
好吧，废话不多，开始吧！
这次用的是Arduino MEGA ADK
Android完整代码：AALed
个人认为较重要的地方：
public void sendLedSwitchCommand(byte target,Boolean isSwitchedOn){
byte[] buffer = new byte[3];
buffer[0] = COMMAND_LED;
buffer[1] = target;
if (isSwitchedOn) {
buffer[2] = VALUE_ON;
}else {
buffer[2] = VALUE_OFF;
}
if(mOutputStream != null){
try{
mOutputStream.write(buffer);
}catch(IOException e){
Log.e(TAG, “write failed", e);
}
}
}
这个是把开灯和关灯的指令传给Arduino
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
if(ACTION_USB_PERMISSION.equals(action)){
synchronized (this) {
UsbAccessory accessory = (UsbAccessory)intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if(intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)){
openAccessory(accessory);
}else{
Log.d(TAG, “permission denied for accessory" + accessory);
}
mPermissionRequestPending = false;
}
}else if (UsbManager.ACTION_USB_ACCESSORY_DETACHED.equals(action)) {
UsbAccessory accessory = (UsbAccessory)intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if(accessory != null && accessory.equals(mAccessory)){
closeAccessory();
}
}
}
};
这个就是接收／连接USB
有个地方非常重要：
一.在res档里创建一个xml档(accessory_filter.xml)
二.在AndroidManifest里的</activity>上面 加入
<intent-filter>
<actionandroid:name=“android.hardware.usb.action.USB_ACCESSORY_ATTACHED"/>
</intent-filter>
<meta-dataandroid:name=“android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
android:resource=“@xml/accessory_filter"/>
在</activity>后加入：
<uses-libraryandroid:name=“com.android.future.usb.accessory"/>
之后就是Arduino的
#include <Max3421e.h>
#include <Usb.h>
#include <AndroidAccessory.h>
#define COMMAND_LED 0×2
#define TARGET_PIN_2 0×2
#define VALUE_ON 0×1
#define VALUE_OFF 0×0
#define PIN 2
AndroidAccessory acc(“Manufacturer",
“Model",
“Description",
“Version",
“URL",
“Serial");
byte rcvmsg[3];
void setup(){
Serial.begin(9600);
acc.powerOn();
pinMode(PIN, OUTPUT);
}
void loop(){
if(acc.isConnected()){
int len = acc.read(rcvmsg, sizeof(rcvmsg), 1);
if(len > 0){
if(rcvmsg[0] == COMMAND_LED){
if(rcvmsg[1] == TARGET_PIN_2){
byte value = rcvmsg[2];
if(value == VALUE_ON){
digitalWrite(PIN, HIGH);
}else if(value == VALUE_OFF){
digitalWrite(PIN, LOW);
}
}
}
}
}
}
编译前请把board 转成 ArduinoMega2560/Mega ADK
ArduinoADK环境搭配看这：http://cartonsbase.twgg.org/arduino-adk-building/zh-cn/