Projects/TempDataLogger/TempLogHostApp_Python/temp_log_config.py

   1 #!/usr/bin/env python
   2
   3 """
   4              LUFA Library
   5      Copyright (C) Dean Camera, 2018.
   6
   7   dean [at] fourwalledcubicle [dot] com
   8            www.lufa-lib.org
   9 """
  10
  11 """
  12     Front-end configuration app for the TempDataLogger project. This script
  13     configures the logger to the current system time and date, with a user
  14     defined logging interval.
  15
  16     The logging interval should be specified in milliseconds and is rounded to
  17     a multiple of 500ms.
  18
  19     Usage:
  20         python temp_log_config.py <Log_Interval>
  21
  22     Example:
  23         python temp_log_config.py 500
  24
  25     Requires the pywinusb library (https://pypi.python.org/pypi/pywinusb/).
  26 """
  27
  28 import sys
  29 from datetime import datetime
  30 import hid
  31
  32
  33 def get_hid_device_handle():
  34     all_hid_devices = hid.enumerate()
  35
  36     lufa_hid_devices = [d for d in all_hid_devices if d['vendor_id'] == 0x03EB and d['product_id'] == 0x2063]
  37
  38     if len(lufa_hid_devices) is 0:
  39         return None
  40
  41     device_handle = hid.device()
  42     device_handle.open_path(lufa_hid_devices[0]['path'])
  43     return device_handle
  44
  45
  46 def configure_temp_log_device(device, time_date, log_interval_500ms):
  47     report_data = bytearray(8)
  48
  49     # Report data for the demo is the report ID (always zero)
  50     report_data[0] = 0
  51
  52     # Followed by the time/date data
  53     report_data[1] = time_date.hour
  54     report_data[2] = time_date.minute,
  55     report_data[3] = time_date.second
  56     report_data[4] = time_date.day,
  57     report_data[5] = time_date.month
  58     report_data[6] = time_date.year - 2000
  59
  60     # Lastly the log interval in 500ms units of time
  61     report_data[7] = log_interval_500ms
  62
  63     # Send the generated report to the device
  64     device.write(report_data)
  65
  66
  67 def main(time_date, log_interval_500ms):
  68     hid_device = get_hid_device_handle()
  69
  70     if hid_device is None:
  71         print("No valid HID device found.")
  72         sys.exit(1)
  73
  74     try:
  75         print("Connected to device.", flush=True)
  76
  77         configure_temp_log_device(hid_device, time_date, log_interval_500ms)
  78
  79         print("Time/Date is now set to %s" % time_date)
  80         print("Log interval is now set to every %0.1fs" % (log_interval_500ms * (500.0 / 1000.0)))
  81
  82     finally:
  83         hid_device.close()
  84
  85
  86 if __name__ == '__main__':
  87     time_date = datetime.now()
  88     log_interval_500ms = (int(sys.argv[1]) / 500) if len(sys.argv) > 1 else 2
  89
  90     # Clamp the log interval to the allowable range
  91     log_interval_500ms = max(log_interval_500ms, 0x01)
  92     log_interval_500ms = min(log_interval_500ms, 0xFF)
  93
  94     main(time_date, log_interval_500ms)