Re: [avrdude-dev] “Not a typewriter” avrdude err or on Android

[Anton Smirnov]

Probably that was pretty unclear.

I modified avrdude 5_11_0 sources in order to:
1. receive additional parameter (socket address) in command-line
2. read file descriptor from the socket using socket address
3. set file descriptor to union filedescriptor
4. use it in serial_open instead of invoking open()

i believe socket code is okay as i've just copied it from another project
and i check file descriptor to be valid (see code snippet) and it's
positive integer (not -1)


2013/6/10 Anton Smirnov <address@hidden>

> > If you get an ENOTTY on setting the baudrate, it would mean your
> driver (the part of the operating system that provides the virtual
> serial port device) is broken/incomplete.
>
> that's bad as i tested on few devices of few manufacturers on different
> android os versions..
> is there any work around for it (without rooting)?
>
> > What I don't understand: a "file descriptor" is a small integer
> number, as returned by the open() syscall.
>
> In my case file descriptor is also int value which originally received in
> android app (java vm) using UsbDeviceConnection.getFIleDescriptor() which
> is written to return file descriptor for native code specially.
> then i pass it to avrdude and since it's child process and file
> descriptors are process-related i have to use unix socket.
>
> so i just pass it from android app to native code (via JNI), which creates
> thread and pass it using socket.
> then i execute modified avrdude executable using socket address and read
> file descriptor from the socket and pass it to serial_device which in my
> case just use this file descriptor instead of executing open() syscall
>
> i can share the code if needed (some code snippets are in question on
> stackoverflow)
>
>
> 2013/6/10 Joerg Wunsch <address@hidden>
>
>> As Anton Smirnov wrote:
>>
>> > This relates to Arduino boards and they have bootloader which talks over
>> > USB using stk500v1/v2 and uploads firmware itself.
>>
>> OK, they indeed use a serial device emulation.
>>
>> If you get an ENOTTY on setting the baudrate, it would mean your
>> driver (the part of the operating system that provides the virtual
>> serial port device) is broken/incomplete.
>>
>> > > > I'm getting file descriptor for usb device on android, grant
>> > > > permissions and pass usb device file descriptor to avrdude process
>> > > > and getting "Now a typewriter" error in ser_posix while trying to
>> > > > set baud rate.
>>
>> What I don't understand: a "file descriptor" is a small integer
>> number, as returned by the open() syscall.  You cannot really pass
>> such a file descriptor to AVRDUDE since AVRDUDE must obtain one
>> itself.
>>
>> So, what's your actual commandline you call AVRDUDE with?
>>
>> --
>> cheers, Joerg               .-.-.   --... ...--   -.. .  DL8DTL
>>
>> http://www.sax.de/~joerg/
>> Never trust an operating system you don't have sources for. ;-)
>>
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>
>