l298: Initial implementation

This was tested on the RobotBase Dual H-Bridge motor control board.

There are two examples:

l298-example: This example demonstrates using the class to contol one
of the H-Brdges to control a DC motor.

l298-stepper-example: This example demonstrates using the class to
control a 4-wire dual-phase stepper motor.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: John Van Drasek <john.r.van.drasek@intel.com>

src/l298/CMakeLists.txt

@@ -0,0 +1,5 @@
+set (libname "l298")
+set (libdescription "upm l298 dual h-bridge")
+set (module_src ${libname}.cxx)
+set (module_h ${libname}.h)
+upm_module_init()