Android Question [SOLVED] FelUSBserial issue

[saunwin]

Hi,
Using FELusbserial to send and recieve a few bytes. I noticed that when sending a byte a random number of DataAvailable events are fired, with what looks like no data bytes.
so I send 62, 62, 64 and 54 and dataAvailable logs empty data. I'm also dropping bytes even though I'm looping in the dataAvailable routine From 0 To Buffer.length-1.
Any advise here ?
TIA

Send a byte

                tx = 62
                'send 0x62 thru serial port
                t = bc.HexToBytes(tx)
                    If usbserial.IsInitialized Then
                    usbserial.Write(t)

Receiving bytes

Private Sub serial_DataAvailable (Buffer() As Byte)
    
    Log("New data: " & bc.HexFromBytes(Buffer))

 

[Erel]

What is the output of:

Log(Buffer.Length)

?

The event is raised whenever the underlying driver calls the read callback.
It shouldn't be raised with no data. Which type of serial device are you using?

 

[saunwin]

Thanks for the reply Erel.

Log ("Buffer Length "& (Buffer.length))

The above line returns zero. So this is normal ? - I'm using the Si Labs 2102

 

[Erel]

No. I guess that felUsbSerial detects it as a FTDI chip and doesn't handle the data properly.

Worth trying with UsbSerial.

 

[saunwin]

OK, this is weird.
My tablet (Tangotab) has two USB ports (a USB A and an OTG).
The OTG appears to work fine.
The full size USB A drops bytes and produces dataavailable events with no data.
Thank you for replying Erel.