Using HID compliant mouse like device in Ubuntu
Solution 1:
I wrote script which was able to do the job. But I had to figure out what the inputs from the device meant.
import sys,pdb
import usb.core
import usb.util
from pymouse import PyMouse
# whiteboard coordinates axis computed by checking the output against strokes
white_board_x_min=(1<<8)+1
white_board_x_max=(127<<8)+255
white_board_y_min=(1<<8)+1
white_board_y_max=(127<<8)+255
white_board_x_diff=white_board_x_max-white_board_x_min
white_board_y_diff=white_board_y_max-white_board_y_min
# mouse handler
m = PyMouse()
x_screen, y_screen = m.screen_size()
# decimal vendor and product values
dev = usb.core.find(idVendor=17955, idProduct=282)
# first endpoint
interface = 0
endpoint = dev[0][(0,0)][0]
# if the OS kernel already claimed the device, which is most likely true
# thanks to http://stackoverflow.com/questions/8218683/pyusb-cannot-set-configuration
if dev.is_kernel_driver_active(interface) is True:
# tell the kernel to detach
dev.detach_kernel_driver(interface)
# claim the device
usb.util.claim_interface(dev, interface)
mouse_down_event=False
try:
while True :
try:
data = dev.read(endpoint.bEndpointAddress,endpoint.wMaxPacketSize)
# click value
click=data[1] # if it is 7 mouse down else if it is 4 it is mouse up
# get the coordinates
xcor,ycor,dec_x_binary,dec_y_binary=data[4],data[6],data[3],data[5]
# convert to decimal
xcor_dec=(xcor<<8)+dec_x_binary
ycor_dec=(ycor<<8)+dec_y_binary
# convert to relative screen coordinates
screen_xcor=int(round((float(xcor_dec-white_board_x_min)/float(white_board_x_diff)) * x_screen))
screen_ycor=int(round((float(ycor_dec-white_board_y_min)/float(white_board_y_diff)) * y_screen))
#print "%d, %d"%(xcor_dec,ycor_dec)
#print "%d, %d"%(screen_xcor,screen_ycor)
# check if it is valid event
if xcor_dec!=0 and ycor_dec!=0:
# move mouse
if click==7:
# mean mouse down event
if mouse_down_event:
# drag event
# draw a line from previous coordinates
m.drag(screen_xcor, screen_ycor)
else:
# first button press event
m.click(screen_xcor, screen_ycor, 1)
mouse_down_event=True
else:
# mouse up event
# set event type in mouse_down_event
# first button press and drag
mouse_down_event=False
except usb.core.USBError as e:
data = None
if e.args == ('Operation timed out',):
continue
finally:
# release the device
usb.util.release_interface(dev, interface)
# reattach the device to the OS kernel
dev.attach_kernel_driver(interface)
https://github.com/abhigenie92/pyusbwhiteboard