def start(self):
"""Starts by default on init, but can be paired with stop()"""
if not self._running:
ret = hid.hid_init()
if ret != hid.HID_RET_SUCCESS:
sys.stderr.write("hid_init failed with return code %d.\n" %
ret)
return
self._hid = hid.hid_new_HIDInterface()
matcher = hid.HIDInterfaceMatcher()
matcher.vendor_id = 0x20ff
matcher.product_id = 0x0100
# The following is necessary due to a bug in the firmware. Units
# shipped after early February 2010 will likely have the fix and
# should successfully open on interface 1. Older units have to
# open on interface 1, fail, and then open on interface 0.
ret = hid.hid_force_open(self._hid, 1, matcher, 3)
if ret != hid.HID_RET_SUCCESS:
ret = hid.hid_force_open(self._hid, 0, matcher, 3)
if ret != hid.HID_RET_SUCCESS:
sys.stderr.write(
"hid_force_open failed with return code %d.\n" % ret)
return
self._running = True
def __init__(self,
vendor_id,
product_id,
interface_number=0,
force=True,
retries=3):
self.is_open = False
if not is_initialized():
init()
matcher = hid.HIDInterfaceMatcher()
matcher.vendor_id = vendor_id
matcher.product_id = product_id
self.interface = hid.hid_new_HIDInterface()
if force:
_hid_raise(
"force_open",
hid.hid_force_open(self.interface, interface_number, matcher,
retries))
else:
_hid_raise("open", hid.hid_open(self.interface, 0, matcher))
self.is_open = True
def __init__(self, vid, pid, errstream=sys.stderr):
self.matcher = hid.HIDInterfaceMatcher()
self.matcher.vendor_id = vid
self.matcher.product_id = pid
return