Under Mac OSX the Tacx Fortius support needed
a few minor tweaks;
* sleep 60ms between read/write operations to
avoid interrupt errors
* clear_halt on read/write endpoints before
attempting to read/write to the device
* remove the errant usb_reset which really should
not have been called in LibUsb since it deletes
the device structure(!)
The LibUsb class has been modified to clear_halt
when opening ANT devices too -- since regression
testing on Mac showed that a) you need the latest
drivers to work with a USB2 stick on Lion (64bit)
and it now appears to mandate a clear_halt when
opening the device (but this may be related to the
Garmin ANT agent leaving it in an unknown state).
Initial support for Tacx Fortius devices.
Note this requires libusb support to be present and will
work on Linux, Mac and Windows.
The handlebar buttons up/down will increase/decrease the
load/intensity in a similar fashion to the +/- keys on
the Computrainer controller.
The cancel button will stop a workout and the enter key
is used to mark a lap.
Slope and Ergo modes are supported, but we do not set the
brake at all if the speed is below 10kph, this is to
ensure it does not get burnt out when users 'grind'.
SPECIAL NOTE:
The Fortius handlebar controller is a Ez-Usb device
and requires firmware to be loaded when it is connected.
Since this is copyrighted by Tacx BV we do not distribute
it, instead, when the user sets up a Fortius device they
must also provide the file. Full instructions on how this
should be done are given when configuring the device.
Additionally, for Linux users udev rules should be added to
ensure that the USB devices are accessible to non-root users.
Fixes#538.
