cannot read but can write on serial port through Android Emulator

Posted by Aad on Stack Overflow See other posts from Stack Overflow or by Aad
Published on 2013-11-07T11:04:13Z Indexed on 2013/11/12 9:54 UTC
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serial-port

I am working on a program that is communicating with serial port over USB through Android emulator.

emulator -qemu -serial /dev/ttyUSB0

The emulator is able to open the port and write into it. However, read is not happening.

The program has a timeout for read maintained by a timer. The read happens in a separate 'read' thread. The main thread has a socketpair fd pair to signal the read-thread that the serial port is closed post timeout. In the read-thread, polling happens(poll() function call) over the 2 file-descriptors: one is serial port fd, the other is one of the socketpair.

The board that I have connected to works fine with sending commands over 'cutecom'

The poll never succeeds for serial port. However, poll succeeds for 'socketpair'ed fd and the thread ends on a close-signal sent from main-thread post timeout.

Ouestions:

Are there any special settings for read as even loop-back fails
Are there differences between settings for read and write on a serial port?

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