Merge pull request #11 from mondalaci/generichid-libusb-scripts

Add libusb GenericHID Python test script.

Demos/Device/ClassDriver/GenericHID/HostTestApp/test_generic_hid_libusb.py

@@ -0,0 +1,98 @@
+#!/usr/bin/env python
+
+"""
+             LUFA Library
+     Copyright (C) Dean Camera, 2013.
+
+  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()