[Tutor] connecting to USB

[BILAL Mustapha]

Le 06/06/2012 11:02, BILAL Mustapha a écrit :
> Hello,
>
>  I am working to connect to a serial link (USB). In order to do that I 
> have to write this command:
>
> sudo ../../tools/stm32w/serialdump-linux -b115200 -d10000 (keeping in 
> mind dat*serialdump-linux*, which is in the path, is not a folder, 
> it's an executable)
>
> To get to the root, I have used: returncode = 
> subprocess.call(["/usr/bin/sudo", "/usr/bin/id"])
>
> Then to connect to the USB through the command above I tried the 
> following:
>
> usb = 
> Popen(['../../tools/stm32w/serialdump-linux','-b115200','-d10000'], 
> stdout=PIPE, stdin=PIPE, stderr=STDOUT)
>
> usb.communicate()[0]
>
>  But I am getting an error, it's considering that serialdump-linux as 
> a folder!!
>
>  Any help how I can run the command?
>
>  Many thanks
>
>
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I resolved the issue, you can do the following:

First method:
args = ("sudo", "../../tools/stm32w/serialdump-linux", "-b115200", 
"-d10000")
usb = Popen(args, stdout=PIPE, stdin=PIPE)
usb.wait()
usb.communicate()[0]

Second method:
cmd = 'sudo ../../tools/stm32w/serialdump-linux -b115200 -d10000'
os.system(cmd)

you can run it using cmd and os or using Popen if you need to use stdout 
and stdin in your application (which is my case)

PS. -b115200 -d10000 are two options related to USB so you can change 
the whole command and use any option you would like to.

Regards

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