UsbSerial 
Usb serial controller for Android. For more information, there is a more complete description.
A brief list of Apps and projects using UsbSerial
Devices Supported
CP210X devices Default: 9600,8,1,None,flow off
CDC devices Default 115200,8,1,None,flow off
FTDI devices Default: 9600,8,1,None,flow off
PL2303 devices Default 9600,8,1,None,flow off
CH34x devices Default 9600,8,1,None,flow off
How to use it?
Instantiate a new object of the UsbSerialDevice class
UsbDevice device; UsbDeviceConnection usbConnection; ... UsbSerialDevice serial = UsbSerialDevice.createUsbSerialDevice(device, usbConnection);
Open the device and set it up as desired
serial.open();
serial.setBaudRate(115200);
serial.setDataBits(UsbSerialInterface.DATA_BITS_8);
serial.setParity(UsbSerialInterface.PARITY_ODD);
serial.setFlowControl(UsbSerialInterface.FLOW_CONTROL_OFF);
If flow control is needed (currently only supported in CP201x and FTDI devices)
/** Values:
UsbSerialInterface.FLOW_CONTROL_OFF
UsbSerialInterface.FLOW_CONTROL_RTS_CTS
UsbSerialInterface.FLOW_CONTROL_DSR_DTR **/ serial.setFlowControl(UsbSerialInterface.FLOW_CONTROL_RTS_CTS);
There is no need to be polling if you want to perform a bulk transaction to a IN endpoint. Define a simply callback
private UsbSerialInterface.UsbReadCallback mCallback = new UsbSerialInterface.UsbReadCallback() {
@Override
public void onReceivedData(byte[] arg0)
{
// Code here :)
}
}
;And pass a reference of it
serial.read(mCallback);
Changes in the CTS and DSR lines will be received in the same manner. Define a callback and pass a reference of it.
private UsbSerialInterface.UsbCTSCallback ctsCallback = new UsbSerialInterface.UsbCTSCallback() {
@Override
public void onCTSChanged(boolean state) {
// Code here :)
}
}
;
private UsbSerialInterface.UsbDSRCallback dsrCallback = new UsbSerialInterface.UsbDSRCallback() {
@Override
public void onDSRChanged(boolean state) {
// Code here :)
}
}
;
serial.getCTS(ctsCallback);
//serial.getDSR(dsrCallback);
Write something
serial.write("DATA".getBytes());
// Async-like operation now! :)Raise the state of the RTS or DTR lines
serial.setRTS(true);
// Raised serial.setRTS(false);
// Not Raised serial.setDTR(true);
// Raised serial.setDTR(false);
// Not RaisedClose the device:
serial.close();
I recommend using UsbSerial as shown above but if you want to perform write and read operations in synchronous way it is possible using these methods:
public boolean syncOpen();
public int syncWrite(byte[] buffer, int timeout) public int syncRead(byte[] buffer, int timeout) public void syncClose();
In Android usb api, when a usb device has been close it must be reopened
UsbDevice device; ... UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
manager.openDevice(UsbDevice device)How to use the SPI interface (BETA)
Support for USB to SPI devices was added recently but it is still in beta. Although I tried to keep the api as close to standard UsbSerial api as possible, be aware because the beta nature of this feature this api may change in the future. Only CP2130 chipset is supported at the moment.
UsbSpiDevice spi = UsbSpiDevice.createUsbSerialDevice(device, connection);
spi.connectSPI();
spi.selectSlave(0);
spi.setClock(CP2130SpiDevice.CLOCK_3MHz);
Define the usual callback
private UsbSpiInterface.UsbMISOCallback misoCallback = new UsbSpiInterface.UsbMISOCallback()
{
@Override
public int onReceivedData(byte[] data) {
// Your code here :)
}
}
; //... spi.setMISOCallback(misoCallback);
spi.writeMOSI("Hola!".getBytes());
// Write "Hola!" to the selected slave through MOSI (MASTER OUTPUT SLAVE INPUT) spi.readMISO(5);
// Read 5 bytes from the MISO (MASTER INPUT SLAVE OUTPUT) line. Data will be received through UsbMISOCallback spi.writeRead("Hola!".getBytes(), 15);
// Write "Hola!" and read 15 bytes synchronouslyClose the device when done
spi.closeSPI();
Gradle
Add the jitpack repo to your your project's build.gradle at the end of repositories
/build.gradle
allprojects {
repositories {
jcenter()
maven {
url "https://jitpack.io"
}
}
}
Then add the dependency to your module's build.gradle:
/app/build.gradle
compile 'com.github.felHR85:UsbSerial:4.5'TO-DO
- RTS/CTS and DSR/DTR implementations for PL2303 and CDC