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#!/usr/bin/env python
"""
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 PyUSB library (http://sourceforge.net/apps/trac/pyusb/).
"""
import sys
from time import sleep
import usb.core
import usb.util
# 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
def get_and_init_hid_device():
device = usb.core.find(idVendor=device_vid, idProduct=device_pid)
if device is None:
sys.exit("Could not find USB device.")
if device.is_kernel_driver_active(0):
try:
device.detach_kernel_driver(0)
except usb.core.USBError as exception:
sys.exit("Could not detatch kernel driver: %s" % str(exception))
try:
device.set_configuration()
except usb.core.USBError as exception:
sys.exit("Could not set configuration: %s" % str(exception))
return device
def send_led_pattern(device, led1, led2, led3, led4):
# Report data for the demo is LED on/off data
report_data = [led1, led2, led3, led4]
# Send the generated report to the device
number_of_bytes_written = device.ctrl_transfer( # Set Report control request
0b00100001, # bmRequestType (constant for this control request)
0x09, # bmRequest (constant for this control request)
0, # wValue (MSB is report type, LSB is report number)
0, # wIndex (interface number)
report_data # report data to be sent
);
assert number_of_bytes_written == len(report_data)
print("Sent LED Pattern: {0}".format(report_data))
def receive_led_pattern(hid_device):
endpoint = hid_device[0][(0,0)][0]
report_data = hid_device.read(endpoint.bEndpointAddress, endpoint.wMaxPacketSize)
return list(report_data)
def main():
hid_device = get_and_init_hid_device()
print("Connected to device 0x%04X/0x%04X - %s [%s]" %
(hid_device.idVendor, hid_device.idProduct,
usb.util.get_string(hid_device, 256, hid_device.iProduct),
usb.util.get_string(hid_device, 256, hid_device.iManufacturer)))
p = 0
while (True):
# 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)
# Receive and print the current LED pattern
led_pattern = receive_led_pattern(hid_device)[0:4]
print("Received LED Pattern: {0}".format(led_pattern))
# Compute next LED pattern in sequence
p = (p + 1) % 16
# Delay a bit for visual effect
sleep(.2)
if __name__ == '__main__':
main()
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