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Feature/support exar #1

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59297a7
feat: use CDC driver for exar
JPHutchins Aug 12, 2022
790f18d
feat: implement config control transfers and remove RTS, DTR
JPHutchins Aug 13, 2022
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1 change: 1 addition & 0 deletions app/src/main/java/de/kai_morich/simple_usb_terminal/CustomProber.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ class CustomProber {
static UsbSerialProber getCustomProber() {
ProbeTable customTable = new ProbeTable();
customTable.addProduct(0x16d0, 0x087e, CdcAcmSerialDriver.class); // e.g. Digispark CDC
customTable.addProduct(0x04e2, 0x1410, CdcAcmSerialDriver.class); // Exar (MaxLinear) xr21v1410
return new UsbSerialProber(customTable);
}

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43 changes: 41 additions & 2 deletions app/src/main/java/de/kai_morich/simple_usb_terminal/SerialSocket.java
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Expand Up @@ -5,6 +5,7 @@
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDeviceConnection;

import com.hoho.android.usbserial.driver.UsbSerialPort;
Expand Down Expand Up @@ -44,10 +45,48 @@ public void onReceive(Context context, Intent intent) {
String getName() { return serialPort.getDriver().getClass().getSimpleName().replace("SerialDriver",""); }

void connect(SerialListener listener) throws IOException {
final int XR_SET_REG = 0x40;
final int XR_REQ = 0x00;

// index is 2 byte; LSB -> register, MSB -> block (shifted 8)
final int XR_BLOCK_UART = 0x00;
final int XR_BLOCK_UART_MANAGER = 0x04 << 8;
final int XR_BLOCK_I2C_EEPROM = 0x65 << 8;
final int XR_BLOCK_UART_CUSTOM = 0x66 << 8;

final int XR_REG_FIFO_ENABLE = 0x10;
final int XR_REG_UART_ENABLE = 0x03;

// buffer will always be null, length 0

// following is the sequence of control transfers sniffed from ExarUSB_android_app_ver1C.apk

this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x00, XR_BLOCK_UART_MANAGER | XR_REG_FIFO_ENABLE, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x00, XR_REG_UART_ENABLE, null, 0, 5000);

this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0xA0, 0x04, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x01, 0x05, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x00, 0x06, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x6d, 0x07, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x0b, 0x08, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x6a, 0x09, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x0b, 0x0a, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x08, 0x0b, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x00, 0x0c, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x0b, 0x1a, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x00, 0x12, null, 0, 5000);

this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x00, 0x03 | XR_BLOCK_UART_CUSTOM, null, 0, 5000);

this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x01, 0x18 | XR_BLOCK_UART_MANAGER, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x01, 0x1c | XR_BLOCK_UART_MANAGER, null, 0, 5000);

this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x01, XR_BLOCK_UART_MANAGER | XR_REG_FIFO_ENABLE, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x03, XR_REG_UART_ENABLE, null, 0, 5000);
this.connection.controlTransfer(XR_SET_REG, XR_REQ, 0x03, XR_BLOCK_UART_MANAGER | XR_REG_FIFO_ENABLE, null, 0, 5000);

this.listener = listener;
context.registerReceiver(disconnectBroadcastReceiver, new IntentFilter(Constants.INTENT_ACTION_DISCONNECT));
serialPort.setDTR(true); // for arduino, ...
serialPort.setRTS(true);
ioManager = new SerialInputOutputManager(serialPort, this);
ioManager.start();
}
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