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Tests: USB: Use libusb0 backend on Windows 

libusb0 supports all features used for testing. A newer version
(libusb1) does not have a complete implementation for Windows.
pull/11458/head
Filip Jagodzinski 2019-09-10 17:37:13 +02:00
parent 8f1bf43335
commit db2995052f
1 changed files with 9 additions and 2 deletions
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11
TESTS/host_tests/pyusb_basic.py
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@ -38,6 +38,14 @@ from usb.util import (DESC_TYPE_DEVICE, DESC_TYPE_CONFIG, DESC_TYPE_STRING,
import struct import struct
if sys.platform.startswith('win'):
# Use libusb0 on Windows. libusb1 implementation for Windows
# does not support all features necessary for testing.
import usb.backend.libusb0
USB_BACKEND = usb.backend.libusb0.get_backend()
else:
# Use a default backend on other platforms.
USB_BACKEND = None
def get_interface(dev, interface, alternate=0): def get_interface(dev, interface, alternate=0):
intf = None intf = None
@ -314,11 +322,10 @@ class PyusbBasicTest(BaseHostTest):
def find_device(self, serial_number): def find_device(self, serial_number):
# to make it more reliable, 20 retries in 2[s] # to make it more reliable, 20 retries in 2[s]
for _ in range(20): for _ in range(20):
dev = usb.core.find(custom_match=TestMatch(serial_number)) dev = usb.core.find(custom_match=TestMatch(serial_number), backend=USB_BACKEND)
if dev is not None: if dev is not None:
break break
time.sleep(0.1) time.sleep(0.1)
if dev is None: if dev is None:
self.log("Device not found") self.log("Device not found")
self.send_kv("failed", "0") self.send_kv("failed", "0")