Add Python alternative host application for the TempDataLogger project.

Projects/TempDataLogger/TempLogHostApp_Python/temp_log_config.py

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+"""
+             LUFA Library
+     Copyright (C) Dean Camera, 2013.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+"""
+
+"""
+    Front-end configuration app for the TempDataLogger project. This script
+    configures the logger to the current system time and date, with a user
+    defined logging interval.
+
+    The logging interval should be specified in milliseconds and is rounded to
+    a multiple of 500ms.
+
+    Usage:
+        python temp_log_config.py <Log_Interval>
+
+    Example:
+        python temp_log_config.py 500
+
+    Requires the pywinusb library (https://pypi.python.org/pypi/pywinusb/).
+"""
+
+import sys
+from datetime import datetime
+import pywinusb.hid as hid
+
+# 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 = 0x2063
+report_length = 1 + 7
+
+
+def get_hid_device_handle():
+    hid_device_filter = hid.HidDeviceFilter(vendor_id=device_vid,
+                                            product_id=device_pid)
+
+    valid_hid_devices = hid_device_filter.get_devices()
+
+    if len(valid_hid_devices) is 0:
+        return None
+    else:
+        return valid_hid_devices[0]
+
+
+def configure_temp_log_device(device, time_date, log_interval_500ms):
+    # Report data for the demo is the report ID (always zero)
+    report_data = [0]
+
+    # Followed by the time/date data
+    report_data.extend([time_date.hour, time_date.minute,
+                        time_date.second, time_date.day,
+                        time_date.month, time_date.year])
+
+    # Lastly the log interval in 500ms units of time
+    report_data.extend([log_interval_500ms])
+
+    # Zero-extend the array to the length the report should be
+    report_data.extend([0] * (report_length - len(report_data)))
+
+    # Send the generated report to the device
+    device.send_output_report(report_data)
+
+
+def main(time_date, log_interval_500ms):
+    hid_device = get_hid_device_handle()
+
+    if hid_device is None:
+        print("No valid HID device found.")
+        sys.exit(1)
+
+    try:
+        hid_device.open()
+
+        print("Connected to device 0x%04X/0x%04X - %s [%s]" %
+              (hid_device.vendor_id, hid_device.product_id,
+               hid_device.product_name, hid_device.vendor_name))
+
+        configure_temp_log_device(hid_device, time_date, log_interval_500ms)
+
+        print("Time/Date is now set to %s" % time_date)
+        print("Log interval is now set to every %0.1fs" % (log_interval_500ms * (500.0 / 1000.0)))
+
+    finally:
+        hid_device.close()
+
+
+if __name__ == '__main__':
+    time_date = datetime.now()
+    log_interval_500ms = (int(sys.argv[1]) / 500) if len(sys.argv) > 1 else 2
+
+    # Clamp the log interval to the allowable range
+    log_interval_500ms = max(log_interval_500ms, 0x01)
+    log_interval_500ms = min(log_interval_500ms, 0xFF)
+
+    main(time_date, log_interval_500ms)