Serial communication fails on second try

[kraiskil]

Running the test/host_test.py fails on a second run:

$ ./host_test.py 
Traceback (most recent call last):
  File "./host_test.py", line 34, in <module>
    print 'if_ver_major = %d; if_ver_minor = %d' % device.if_ver()
TypeError: %d format: a number is required, not NoneType

Rebooting the Arduino makes ./host_test.py work again, once.

[balau]

Hi, thanks for reporting this, It's most probably because the test changes the serial baud rate with set_serial_speed(115200), but the default is 9600.
The next execution of the script, jtagduino(jtagduino_port) will locally set the speed of 9600 but the Arduino is still running at 115200.
You can add to the script set_serial_speed(jtagduino.DEFAULT_BAUD_RATE) at the end.

[kraiskil]

Right. That seems to be the issue.
Either commenting out set_serial_speed(115200) or setting it back to 9600 at the end seem to work.