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"""
LUFA Library
Copyright (C) Dean Camera, 2017.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
"""
"""
LUFA Generic HID device demo host test script. This script will send a
continuous stream of generic reports to the device, to show a variable LED
pattern on the target board. Send and received report data is printed to
the terminal.
Requires the pywinusb library (https://pypi.python.org/pypi/pywinusb/).
"""
import sys
from time import sleep
import pywinusb.hid as hid
# Generic HID device VID, PID and report payload length (length is increased
# by one to account for the Report ID byte that must be pre-pended)
device_vid = 0x03EB
device_pid = 0x204F
report_length = 1 + 8
def get_hid_device_handle():
hid_device_filter = hid.HidDeviceFilter(vendor_id=device_vid,
product_id=device_pid)
valid_hid_devices = hid_device_filter.get_devices()
if len(valid_hid_devices) is 0:
return None
else:
return valid_hid_devices[0]
def send_led_pattern(device, led1, led2, led3, led4):
# Report data for the demo is the report ID (always zero) followed by the
# LED on/off data
report_data = [0, led1, led2, led3, led4]
# Zero-extend the array to the length the report should be
report_data.extend([0] * (report_length - len(report_data)))
# Send the generated report to the device
device.send_output_report(report_data)
print("Sent LED Pattern: {0}".format(report_data[1:5]))
def received_led_pattern(report_data):
print("Received LED Pattern: {0}".format(report_data[1:5]))
def main():
hid_device = get_hid_device_handle()
if hid_device is None:
print("No valid HID device found.")
sys.exit(1)
try:
hid_device.open()
print("Connected to device 0x%04X/0x%04X - %s [%s]" %
(hid_device.vendor_id, hid_device.product_id,
hid_device.product_name, hid_device.vendor_name))
# Set up the HID input report handler to receive reports
hid_device.set_raw_data_handler(received_led_pattern)
p = 0
while (hid_device.is_plugged()):
# Convert the current pattern index to a bit-mask and send
send_led_pattern(hid_device,
(p >> 3) & 1,
(p >> 2) & 1,
(p >> 1) & 1,
(p >> 0) & 1)
# Compute next LED pattern in sequence
p = (p + 1) % 16
# Delay a bit for visual effect
sleep(.2)
finally:
hid_device.close()
if __name__ == '__main__':
main()
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