Console Serial Port Communication

[piersante]

I use a cubieboard for some development and testings. I would like to use the embedded serial port connector for communication with my own electronic board. This serial port is used currently for console and debug messages. It works at 115.200 bps.

There is any way or library that allow the use of the console/debug channel for a bidirectional communication?

 

[Erel]

Are you running Android OS on this board?

 

[piersante]

Are you running Android OS on this board?

yes android 4

 

[Erel]

Try to read and write to: /dev/ttyS0

 

[piersante]

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

 

[EvgenyB4A]

Try to read and write to: /dev/ttyS0

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

 

[Erel]

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

 

[EvgenyB4A]

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

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.

 

[Erel]

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