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mik3y / usb-serial-for-android

Android USB host serial driver library for CDC, FTDI, Arduino and other devices.
MIT License
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usb can be detected but usbManger.openDevice() returns null #472

Closed NortacYWang closed 1 year ago

NortacYWang commented 1 year ago

Hello, I use an usb and it has been detected , and I logged usbDevice: (firstDriver.getDevice()); 

UsbDevice[mName=/dev/bus/usb/002/002,
mVendorId=1155,
mProductId=22336,
mClass=2,
mSubclass=2,
mProtocol=0,
mManufacturerName=STMicroelectronics,mProductName=STM32 VirtualComPort,
mVersion=2.00,mSerialNumberReader=android.hardware.usb.IUsbSerialReader$Stub$Proxy@8406b31, mHasAudioPlayback=false, mHasAudioCapture=false, mHasMidi=false, mHasVideoCapture=false, mHasVideoPlayback=false, mConfigurations=[
UsbConfiguration[mId=1,mName=null,mAttributes=192,mMaxPower=50,mInterfaces=[
UsbInterface[mId=0,mAlternateSetting=0,mName=null,mClass=2,mSubclass=2,mProtocol=1,mEndpoints=[
UsbEndpoint[mAddress=130,mAttributes=3,mMaxPacketSize=8,mInterval=16]]
UsbInterface[mId=1,mAlternateSetting=0,mName=null,mClass=10,mSubclass=0,mProtocol=0,mEndpoints=[
UsbEndpoint[mAddress=1,mAttributes=2,mMaxPacketSize=64,mInterval=0]
UsbEndpoint[mAddress=129,mAttributes=2,mMaxPacketSize=64,mInterval=0]]]]

I see in devices.filter, the ST CDC(1155/22336) is supported, 

 UsbDeviceConnection connection = usbManager.openDevice(firstDriver.getDevice())

but still the connection returns null, can someone help me with this ?

Thanks

NortacYWang commented 1 year ago

Hello, I use an usb and it has been detected , and I logged usbDevice: (firstDriver.getDevice());

UsbDevice[mName=/dev/bus/usb/002/002,
mVendorId=1155,
mProductId=22336,
mClass=2,
mSubclass=2,
mProtocol=0,
mManufacturerName=STMicroelectronics,mProductName=STM32 VirtualComPort,
mVersion=2.00,mSerialNumberReader=android.hardware.usb.IUsbSerialReader$Stub$Proxy@8406b31, mHasAudioPlayback=false, mHasAudioCapture=false, mHasMidi=false, mHasVideoCapture=false, mHasVideoPlayback=false, mConfigurations=[
UsbConfiguration[mId=1,mName=null,mAttributes=192,mMaxPower=50,mInterfaces=[
UsbInterface[mId=0,mAlternateSetting=0,mName=null,mClass=2,mSubclass=2,mProtocol=1,mEndpoints=[
UsbEndpoint[mAddress=130,mAttributes=3,mMaxPacketSize=8,mInterval=16]]
UsbInterface[mId=1,mAlternateSetting=0,mName=null,mClass=10,mSubclass=0,mProtocol=0,mEndpoints=[
UsbEndpoint[mAddress=1,mAttributes=2,mMaxPacketSize=64,mInterval=0]
UsbEndpoint[mAddress=129,mAttributes=2,mMaxPacketSize=64,mInterval=0]]]]

I see in devices.filter, the ST CDC(1155/22336) is supported,

 UsbDeviceConnection connection = usbManager.openDevice(firstDriver.getDevice())

but still the connection returns null, can someone help me with this ?

Thanks

my bad, I need to requestPermission to usb if connection return null