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#!/usr/bin/env python
"""
LUFA Library
Copyright (C) Dean Camera, 2018.
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 hid
def get_hid_device_handle():
all_hid_devices = hid.enumerate()
lufa_hid_devices = [d for d in all_hid_devices if d['vendor_id'] == 0x03EB and d['product_id'] == 0x204F]
if len(lufa_hid_devices) is 0:
return None
device_handle = hid.device()
device_handle.open_path(lufa_hid_devices[0]['path'])
return device_handle
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 = bytearray(9)
report_data[0] = 0
report_data[1] = led1
report_data[2] = led2
report_data[3] = led3
report_data[4] = led4
# Send the generated report to the device
device.write(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:
print("Connected to device.", flush=True)
# 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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