Console Serial Port Communication

Are you running Android OS on this board?

Erel said:

Are you running Android OS on this board?

Click to expand...

yes android 4

Try to read and write to: /dev/ttyS0

well... /dev/ttS0 is working but I need to solve some issues with permissions and linux console service that get the input. I'll try to found a solution. maybe a root system.

Inviato dal mio A500

Erel said:

Try to read and write to: /dev/ttyS0

Click to expand...

I try to use /dev/ttyS0. It reads the data but the same data is outputted(mirror effect). how to avoid it?

Which device are you using? What do you mean with mirrored?

Erel said:

Which device are you using? What do you mean with mirrored?

Click to expand...

I use the industrial Android tablet with Android 4.1 that has 4 Uarts. I connect UART0 to PC COM port and use the PC program UART Terminal. In Android I use the following code:

Dim fo As OutputStream
Dim fi As InputStream
fo = File.OpenOutput("/dev/ttyS0", "", False)
fi = File.OpenInput("/dev/ttyS0", "")

astreams.Initialize(fi,fo,"astreams") 'connect with asyncstream
...
Sub astreams_NewData (Buffer() As Byte)
Log("NewData")
Log(BytesToString(Buffer, 0, Buffer.Length, "UTF8"))
End Sub
...
Sub btnAction_Click
' astreams.Write("abcde".GetBytes("UTF8"))
File.WriteString("/dev/ttyS0", "","abcdefghklm" & CRLF)
End Sub
...
When I send from PC any string(assume "12345" & CRLF) I get it in astreams_NewData, but at the same time it appears in the Receive window of PC Uart Terminal as if Android sent it back. That I mean mirror effect and I want to avoid this.
Using the command File.WriteString("/dev/ttyS0", "","abcdefghklm" & CRLF) I successfully send any data from Android To PC.

It is not your code that echos the messages. It happens somewhere else.