[android-porting] Re: Emulator's /dev/ttyS0

[ari]

Hi Coolio,
Your input helped a lot.I had the similar kind of
issue.I have an application which has to be run from the android
shell.The requests from the application will go to my library and it
sends it to the /dev/ttyS0.I have a portlistener in the host windows
machine which will listen to the port given as emulator option . the
command is

emulator.exe -avd androidavd -verbose -qemu -serial COM9

But after that there was coming to the portlistener. Then I changed by
library port options to /dev/ttyS1, but that also didnt work.After
that I changed /dev/ttyS2 than i was able to see something coming into
the portlistener.

I want to ask coolio that how did u come to know that it will be /dev/
ttys2??

Please let me know a about your findings.

On Jan 23 2009, 5:20 am, coolio <justinca...@gmail.com> wrote:
> Thanks,
>
> What is the default configuration for /dev/ttyS2 and what is the
> command to change the configuration?
>
> Justin
>
> On Jan 22, 1:51 pm, David Turner <di...@android.com> wrote:
>
> > if you're using the -qemu -serial <device> option when starting the
> > emulator, it will probably be mapped to /dev/ttyS2 or ttyS3 within the
> > emulator.
>
> > that's because the emulator uses a couple of serial ports for its own needs:
> > one is to get kernel messages, and the other for the "qemud" multiplexing
> > daemon which manages a communication channel between the emulator program
> > and various Android sub-systems (e.g. the GSM stack, the GPS support,
> > etc...)
>
> > you can use emulator -verbose to see which -serial <dev> are inserted before
> > yours when starting the emulator, if that can help
>
> > On Thu, Jan 22, 2009 at 11:52 AM, coolio <justinca...@gmail.com> wrote:
>
> > > Hi,
>
> > > I run SDK's emulator and opened /dev/ttyS0, when I write to that
> > > device , it didn't show up in host's serial port. Does anybody konw
> > > what /dev/ttyS0 in emulator is mapped to? Is there any possibility
> > > that I can map emulator's /dev/ttyS0 to /dev/ttyS0 of the linux host
> > > that is running emulator. If I add a serial port on linux host, can I
> > > add/map the serial port to emulator?
>
> > > Thanks- Hide quoted text -
>
> > - Show quoted text -

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[David Turner]

On Fri, Apr 30, 2010 at 12:41 AM, ari <das....@gmail.com> wrote:

Hi Coolio,
                 Your input helped a lot.I had the similar kind of
issue.I have an application which has to be run from the android
shell.The requests from the application will go to my library and it
sends it to the /dev/ttyS0.I have a portlistener in the host windows
machine which will listen to the port given as emulator option . the
command is

emulator.exe -avd androidavd -verbose -qemu -serial COM9

But after that there was coming to the portlistener. Then I changed by
library port options to /dev/ttyS1, but that also didnt work.After
that I changed /dev/ttyS2 than i was able to see something coming into
the portlistener.

I want to ask coolio that how did u come to know that it will be /dev/
ttys2??

Because the Android emulator already uses /dev/ttyS0 and /dev/ttyS1 in the guest system

for its own usage (/dev/ttyS0 is to get kernel messages, like thoses displayed with -show-kernel,

and /dev/ttyS1 is to implement the "qemud" multiplexing daemon, an internal implementation

detail you should not care about).

So when you do -qemu -serial COM9, it really means "allocate the next available

emulated serial port device and connect it to the host COM9", hence the /dev/ttyS2