Projects/TempDataLogger/TempLogHostApp_Python/temp_log_config.py

   1 """
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 """
   8
   9 """
  10     Front-end configuration app for the TempDataLogger project. This script
  11     configures the logger to the current system time and date, with a user
  12     defined logging interval.
  13
  14     The logging interval should be specified in milliseconds and is rounded to
  15     a multiple of 500ms.
  16
  17     Usage:
  18         python temp_log_config.py <Log_Interval>
  19
  20     Example:
  21         python temp_log_config.py 500
  22
  23     Requires the pywinusb library (https://pypi.python.org/pypi/pywinusb/).
  24 """
  25
  26 import sys
  27 from datetime import datetime
  28 import pywinusb.hid as hid
  29
  30 # Generic HID device VID, PID and report payload length (length is increased
  31 # by one to account for the Report ID byte that must be pre-pended)
  32 device_vid = 0x03EB
  33 device_pid = 0x2063
  34 report_length = 1 + 7
  35
  36
  37 def get_hid_device_handle():
  38     hid_device_filter = hid.HidDeviceFilter(vendor_id=device_vid,
  39                                             product_id=device_pid)
  40
  41     valid_hid_devices = hid_device_filter.get_devices()
  42
  43     if len(valid_hid_devices) is 0:
  44         return None
  45     else:
  46         return valid_hid_devices[0]
  47
  48
  49 def configure_temp_log_device(device, time_date, log_interval_500ms):
  50     # Report data for the demo is the report ID (always zero)
  51     report_data = [0]
  52
  53     # Followed by the time/date data
  54     report_data.extend([time_date.hour, time_date.minute,
  55                         time_date.second, time_date.day,
  56                         time_date.month, time_date.year - 2000])
  57
  58     # Lastly the log interval in 500ms units of time
  59     report_data.extend([log_interval_500ms])
  60
  61     # Zero-extend the array to the length the report should be
  62     report_data.extend([0] * (report_length - len(report_data)))
  63
  64     # Send the generated report to the device
  65     device.send_output_report(report_data)
  66
  67
  68 def main(time_date, log_interval_500ms):
  69     hid_device = get_hid_device_handle()
  70
  71     if hid_device is None:
  72         print("No valid HID device found.")
  73         sys.exit(1)
  74
  75     try:
  76         hid_device.open()
  77
  78         print("Connected to device 0x%04X/0x%04X - %s [%s]" %
  79               (hid_device.vendor_id, hid_device.product_id,
  80                hid_device.product_name, hid_device.vendor_name))
  81
  82         configure_temp_log_device(hid_device, time_date, log_interval_500ms)
  83
  84         print("Time/Date is now set to %s" % time_date)
  85         print("Log interval is now set to every %0.1fs" % (log_interval_500ms * (500.0 / 1000.0)))
  86
  87     finally:
  88         hid_device.close()
  89
  90
  91 if __name__ == '__main__':
  92     time_date = datetime.now()
  93     log_interval_500ms = (int(sys.argv[1]) / 500) if len(sys.argv) > 1 else 2
  94
  95     # Clamp the log interval to the allowable range
  96     log_interval_500ms = max(log_interval_500ms, 0x01)
  97     log_interval_500ms = min(log_interval_500ms, 0xFF)
  98
  99     main(time_date, log_interval_500ms)