Demos/Device/LowLevel/GenericHID/HostTestApp/test_generic_hid.py

   1 """
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2017.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 """
   8
   9 """
  10     LUFA Generic HID device demo host test script. This script will send a
  11     continuous stream of generic reports to the device, to show a variable LED
  12     pattern on the target board. Send and received report data is printed to
  13     the terminal.
  14
  15     Requires the pywinusb library (https://pypi.python.org/pypi/pywinusb/).
  16 """
  17
  18 import sys
  19 from time import sleep
  20 import pywinusb.hid as hid
  21
  22 # Generic HID device VID, PID and report payload length (length is increased
  23 # by one to account for the Report ID byte that must be pre-pended)
  24 device_vid = 0x03EB
  25 device_pid = 0x204F
  26 report_length = 1 + 8
  27
  28
  29 def get_hid_device_handle():
  30     hid_device_filter = hid.HidDeviceFilter(vendor_id=device_vid,
  31                                             product_id=device_pid)
  32
  33     valid_hid_devices = hid_device_filter.get_devices()
  34
  35     if len(valid_hid_devices) is 0:
  36         return None
  37     else:
  38         return valid_hid_devices[0]
  39
  40
  41 def send_led_pattern(device, led1, led2, led3, led4):
  42     # Report data for the demo is the report ID (always zero) followed by the
  43     # LED on/off data
  44     report_data = [0, led1, led2, led3, led4]
  45
  46     # Zero-extend the array to the length the report should be
  47     report_data.extend([0] * (report_length - len(report_data)))
  48
  49     # Send the generated report to the device
  50     device.send_output_report(report_data)
  51
  52     print("Sent LED Pattern: {0}".format(report_data[1:5]))
  53
  54
  55 def received_led_pattern(report_data):
  56     print("Received LED Pattern: {0}".format(report_data[1:5]))
  57
  58
  59 def main():
  60     hid_device = get_hid_device_handle()
  61
  62     if hid_device is None:
  63         print("No valid HID device found.")
  64         sys.exit(1)
  65
  66     try:
  67         hid_device.open()
  68
  69         print("Connected to device 0x%04X/0x%04X - %s [%s]" %
  70               (hid_device.vendor_id, hid_device.product_id,
  71                hid_device.product_name, hid_device.vendor_name))
  72
  73         # Set up the HID input report handler to receive reports
  74         hid_device.set_raw_data_handler(received_led_pattern)
  75
  76         p = 0
  77         while (hid_device.is_plugged()):
  78             # Convert the current pattern index to a bit-mask and send
  79             send_led_pattern(hid_device,
  80                              (p >> 3) & 1,
  81                              (p >> 2) & 1,
  82                              (p >> 1) & 1,
  83                              (p >> 0) & 1)
  84
  85             # Compute next LED pattern in sequence
  86             p = (p + 1) % 16
  87
  88             # Delay a bit for visual effect
  89             sleep(.2)
  90
  91     finally:
  92         hid_device.close()
  93
  94
  95 if __name__ == '__main__':
  96     main()