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Code Issues Releases Wiki Activity

adding support for USB devices with only one channel

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This commit is contained in:
Jens Peter Schroer 2015-05-12 12:22:28 +02:00
parent 228c7936eb
commit 45b8364103
1 changed files with 103 additions and 25 deletions
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128
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/CdcAcmSerialDriver.java
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@ -107,42 +107,120 @@ public class CdcAcmSerialDriver implements UsbSerialDriver {
mConnection = connection;
boolean opened = false;
try {
Log.d(TAG, "claiming interfaces, count=" + mDevice.getInterfaceCount());
mControlInterface = mDevice.getInterface(0);
Log.d(TAG, "Control iface=" + mControlInterface);
// class should be USB_CLASS_COMM
if (!mConnection.claimInterface(mControlInterface, true)) {
throw new IOException("Could not claim control interface.");
}
mControlEndpoint = mControlInterface.getEndpoint(0);
Log.d(TAG, "Control endpoint direction: " + mControlEndpoint.getDirection());
Log.d(TAG, "Claiming data interface.");
mDataInterface = mDevice.getInterface(1);
Log.d(TAG, "data iface=" + mDataInterface);
// class should be USB_CLASS_CDC_DATA
if (!mConnection.claimInterface(mDataInterface, true)) {
throw new IOException("Could not claim data interface.");
}
mReadEndpoint = mDataInterface.getEndpoint(1);
Log.d(TAG, "Read endpoint direction: " + mReadEndpoint.getDirection());
mWriteEndpoint = mDataInterface.getEndpoint(0);
Log.d(TAG, "Write endpoint direction: " + mWriteEndpoint.getDirection());
if (mEnableAsyncReads) {
Log.d(TAG, "Async reads enabled");
if (1 == mDevice.getInterfaceCount()) {
Log.d(TAG,"device might be castrated ACM device, trying single interface logic");
openSingleInterface();
} else {
Log.d(TAG, "Async reads disabled.");
Log.d(TAG,"trying default interface logic");
openInterface();
}
if (mEnableAsyncReads) {
Log.d(TAG, "Async reads enabled");
} else {
Log.d(TAG, "Async reads disabled.");
}
opened = true;
} finally {
if (!opened) {
mConnection = null;
// just to be on the save side
mControlEndpoint = null;
mReadEndpoint = null;
mWriteEndpoint = null;
}
}
}
private void openSingleInterface() throws IOException {
// the following code is inspired by the cdc-acm driver
// in the linux kernel
mControlInterface = mDevice.getInterface(0);
Log.d(TAG, "Control iface=" + mControlInterface);
mDataInterface = mDevice.getInterface(0);
Log.d(TAG, "data iface=" + mDataInterface);
if (!mConnection.claimInterface(mControlInterface, true)) {
throw new IOException("Could not claim shared control/data interface.");
}
int endCount = mControlInterface.getEndpointCount();
if (endCount < 3) {
Log.d(TAG,"not enough endpoints - need 3. count=" + mControlInterface.getEndpointCount());
throw new IOException("Insufficient number of endpoints(" + mControlInterface.getEndpointCount() + ")");
}
// Analyse endpoints for their properties
mControlEndpoint = null;
mReadEndpoint = null;
mWriteEndpoint = null;
for (int i = 0; i < endCount; ++i) {
UsbEndpoint ep = mControlInterface.getEndpoint(i);
if ((ep.getDirection() == UsbConstants.USB_DIR_IN) &&
(ep.getType() == UsbConstants.USB_ENDPOINT_XFER_INT)) {
Log.d(TAG,"Found controlling endpoint");
mControlEndpoint = ep;
} else if ((ep.getDirection() == UsbConstants.USB_DIR_IN) &&
(ep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK)) {
Log.d(TAG,"Found reading endpoint");
mReadEndpoint = ep;
} else if ((ep.getDirection() == UsbConstants.USB_DIR_OUT) &&
(ep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK)) {
Log.d(TAG,"Found writing endpoint");
mWriteEndpoint = ep;
}
if ((mControlEndpoint != null) &&
(mReadEndpoint != null) &&
(mWriteEndpoint != null)) {
Log.d(TAG,"Found all required endpoints");
break;
}
}
if ((mControlEndpoint == null) ||
(mReadEndpoint == null) ||
(mWriteEndpoint == null)) {
Log.d(TAG,"Could not establish all endpoints");
throw new IOException("Could not establish all endpoints");
}
}
private void openInterface() throws IOException {
Log.d(TAG, "claiming interfaces, count=" + mDevice.getInterfaceCount());
mControlInterface = mDevice.getInterface(0);
Log.d(TAG, "Control iface=" + mControlInterface);
// class should be USB_CLASS_COMM
if (!mConnection.claimInterface(mControlInterface, true)) {
throw new IOException("Could not claim control interface.");
}
mControlEndpoint = mControlInterface.getEndpoint(0);
Log.d(TAG, "Control endpoint direction: " + mControlEndpoint.getDirection());
Log.d(TAG, "Claiming data interface.");
mDataInterface = mDevice.getInterface(1);
Log.d(TAG, "data iface=" + mDataInterface);
// class should be USB_CLASS_CDC_DATA
if (!mConnection.claimInterface(mDataInterface, true)) {
throw new IOException("Could not claim data interface.");
}
mReadEndpoint = mDataInterface.getEndpoint(1);
Log.d(TAG, "Read endpoint direction: " + mReadEndpoint.getDirection());
mWriteEndpoint = mDataInterface.getEndpoint(0);
Log.d(TAG, "Write endpoint direction: " + mWriteEndpoint.getDirection());
}
private int sendAcmControlMessage(int request, int value, byte[] buf) {
return mConnection.controlTransfer(
USB_RT_ACM, request, value, 0, buf, buf != null ? buf.length : 0, 5000);