RS232串口通信 基于ZE613_Android串口转接设备
在网上看到了很多RS232串口操作的讲解，发现基本都是root了，但是在实际开发应用中，这个还有有很多限制的，下面是在非root的情况下，使用基于ZE_613设备RS232串口通信的一些使用情况。
（一）RS232标准接口 （这里是借鉴的https://www.cnblogs.com/leestar54/p/6604636.html#wiz_toc_1）
也就是PC电脑上所说的COM口，RS232是负逻辑电平，它定义+5+12V为低电平，而-12-5V为高电平。
正常情况下，PC台式主机机箱都会有一个RS232的通讯接口（别和VGI的口搞错啦！），而目前笔记本几乎不会带有了，所以都是用USB转接口。
UART
及Universal Asynchronous Receiver Transmitter：通用异步收发器，通常ARM嵌入式板子都会集成此接口
UART有4个pin（VCC, GND, RX, TX）, 用的TTL电平, 低电平为0(0V)，高电平为1（3.3V或以上）。
RS232与UART转接
通常嵌入式里所说的串口，是指UART口，但硬件众多，大多数都是基于RS232和UART，有时候这两种口之间需要通讯，最主要不同的其实也就是电平不一样，所以需要转接口，某宝上MAX3232种类繁多。
（二）RS232 Android开发
这里是源代码地址：https://github.com/LeeVanie/USB232Demo
1、添加权限
如果是7.0以上的手机，对于读写权限需要自己处理，网上很多，这里就不介绍了
2、在需要使用RS232串口的界面添加下面代码
3、在res下新建device_filter.xml文件
3、在libs中导入包d2xx.jar，因为这里是用的是Z-TEK厂家的
（ps----我也怕厂家追究我盗用他们的版权）
首先对包进行初始化：
try {
ftD2xx = D2xxManager.getInstance(this);
} catch (D2xxManager.D2xxException ex) {
ex.printStackTrace();
}
然后设置vid、pid
if(!ftD2xx.setVIDPID(0x0403, 0x6001))
Log.i("ftd2xx-java","setVIDPID Error");
开启广播
IntentFilter filter = new IntentFilter();
filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
filter.setPriority(500);
this.registerReceiver(mUsbReceiver, filter);
检测设备
int tempDevCount = ftD2xx.createDeviceInfoList(this);
if (tempDevCount > 0) {
if( DevCount != tempDevCount ) {
DevCount = tempDevCount;
}
} else {
DevCount = -1;
currentIndex = -1;
}
连接设备
int tmpProtNumber = openIndex + 1;
if( currentIndex != openIndex ) {
if(null == ftDev) {
try {
ftDev = ftD2xx.openByIndex(this, openIndex);
} catch (Exception e){
ftDev = null;
}
} else {
synchronized(ftDev) {
ftDev = ftD2xx.openByIndex(this, openIndex);
}
}
uart_configured = false;
} else {
Toast.makeText(this,"Device port " + tmpProtNumber + " is already opened",Toast.LENGTH_LONG).show();
return;
}
if(ftDev == null) {
Toast.makeText(this,"open device port("+tmpProtNumber+") NG, ftDev == null", Toast.LENGTH_LONG).show();
return;
}
if (true == ftDev.isOpen()) {
currentIndex = openIndex;
Toast.makeText(this, "open device port(" + tmpProtNumber + ") OK", Toast.LENGTH_SHORT).show();
if(false == bReadThreadGoing) {
read_thread = new readThread(handler);
read_thread.start();
bReadThreadGoing = true;
}
} else {
FT_EEPROM ft_Data = null;
if(ftD2xx.createDeviceInfoList(this) <= 0)
return;
ftDev = ftD2xx.openByIndex(this, 0);
ft_Data = ftDev.eepromRead();
if (ft_Data == null) {
Toast.makeText(this, "Not supported device",
Toast.LENGTH_SHORT).show();
} else {
final FT_EEPROM finalFt_Data = ft_Data;
runOnUiThread(new Runnable() {
@Override
public void run() {
((TextView)findViewById(R.id.vid)).setText(Integer.toHexString(finalFt_Data.VendorId));
((TextView)findViewById(R.id.pid)).setText(Integer.toHexString(finalFt_Data.ProductId));
}
});
}
int iVid = Integer.parseInt(Integer.toHexString(ft_Data.VendorId),16);
int iPid = Integer.parseInt(Integer.toHexString(ft_Data.ProductId),16);
ftD2xx.setVIDPID(iVid,iPid);
Toast.makeText(this, "open device port(" + tmpProtNumber + ") NG", Toast.LENGTH_LONG).show();
//Toast.makeText(this, "Need to get permission!", Toast.LENGTH_SHORT).show();
}
设置连接参数
if (ftDev == null){
return;
}
if (ftDev.isOpen() == false) {
Log.e("j2xx", "SetConfig: device not open");
return;
}
// configure our port
// reset to UART mode for 232 devices
ftDev.setBitMode((byte) 0, D2xxManager.FT_BITMODE_RESET);
ftDev.setBaudRate(baud);
switch (dataBits) {
case 7:
dataBits = D2xxManager.FT_DATA_BITS_7;
break;
case 8:
dataBits = D2xxManager.FT_DATA_BITS_8;
break;
default:
dataBits = D2xxManager.FT_DATA_BITS_8;
break;
}
switch (stopBits) {
case 1:
stopBits = D2xxManager.FT_STOP_BITS_1;
break;
case 2:
stopBits = D2xxManager.FT_STOP_BITS_2;
break;
default:
stopBits = D2xxManager.FT_STOP_BITS_1;
break;
}
switch (parity) {
case 0:
parity = D2xxManager.FT_PARITY_NONE;
break;
case 1:
parity = D2xxManager.FT_PARITY_ODD;
break;
case 2:
parity = D2xxManager.FT_PARITY_EVEN;
break;
case 3:
parity = D2xxManager.FT_PARITY_MARK;
break;
case 4:
parity = D2xxManager.FT_PARITY_SPACE;
break;
default:
parity = D2xxManager.FT_PARITY_NONE;
break;
}
ftDev.setDataCharacteristics(dataBits, stopBits, parity);
short flowCtrlSetting;
switch (flowControl) {
case 0:
flowCtrlSetting = D2xxManager.FT_FLOW_NONE;
break;
case 1:
flowCtrlSetting = D2xxManager.FT_FLOW_RTS_CTS;
break;
case 2:
flowCtrlSetting = D2xxManager.FT_FLOW_DTR_DSR;
break;
case 3:
flowCtrlSetting = D2xxManager.FT_FLOW_XON_XOFF;
break;
default:
flowCtrlSetting = D2xxManager.FT_FLOW_NONE;
break;
}
// TODO : flow ctrl: XOFF/XOM
// TODO : flow ctrl: XOFF/XOM
ftDev.setFlowControl(flowCtrlSetting, (byte) 0x0b, (byte) 0x0d);
uart_configured = true;
Toast.makeText(this, "Config done", Toast.LENGTH_SHORT).show();
开启线程，接收数据
private class readThread extends Thread {
Handler mHandler;
readThread(Handler h){
mHandler = h;
this.setPriority(Thread.MIN_PRIORITY);
}
@Override
public void run() {
int i;
while(true == bReadThreadGoing) {
try {
Thread.sleep(50);
} catch (InterruptedException e) {
}
synchronized(ftDev) {
iavailable = ftDev.getQueueStatus();
if (iavailable > 0) {
if(iavailable > readLength){
iavailable = readLength;
}
ftDev.read(readData, iavailable);
reciveData = "";
for (i = 0; i < iavailable; i++) {
readDataToText[i] = (char) readData[i];
reciveData += HexUtils.bytesToHexString(readData) + " ";
// LogUtil.open().appendMethodB(
// "{rs232:---readDataToText---" + HexUtils.bytesToHexString(readData) +
// "},");
}
Message msg = mHandler.obtainMessage();
mHandler.sendMessage(msg);
}
}
}
}
}
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if(iavailable > 0) {
accept.append(String.copyValueOf(readDataToText, 0, iavailable));
accept.setText(reciveData);
LogUtil.open().appendMethodB(
"{rs232:---reciveData---" + accept.getText().toString().trim() +
"},");
}
}
};
发送数据
if (ftDev.isOpen() == false) {
Log.e("j2xx", "SendMessage: device not open");
return;
}
ftDev.setLatencyTimer((byte) 16);
// ftDev.purge((byte) (D2xxManager.FT_PURGE_TX | D2xxManager.FT_PURGE_RX));
String writeData = editText.getText().toString();
byte[] OutData = writeData.getBytes();
ftDev.write(OutData, writeData.length());
监听设备连接是否断开
/***********USB broadcast receiver*******************************************/
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent)
{
String TAG = "FragL";
String action = intent.getAction();
if(UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
Log.i(TAG,"DETACHED...");
LogUtil.open().appendMethodB("{rs232:---DETACHED---},");
disconnectFunction();
}
}
};
就只有这么多，如果有需要的可以联系
这里是源代码地址：https://github.com/LeeVanie/USB232Demo