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scriptname = os . path . basename ( sys . argv [ 0 ])
print( "Usage:" )
print( scri ' <serial_number>' )
print( scri ' <logical_name>' )
print( scri ' any ' )
sys . exit ()
def die ( msg ) :
sys . exit ( msg + ' (check USB cable)' )
errmsg = YRefParam ()
if len ( sys . argv ) < 2 :
usage ()
target = sys . argv [ 1 ]
# Setup the API to use local USB devices
if YAPI . RegisterHub ( "usb" , errmsg ) != YAPI . SUCCESS :
sys . exit ( "init error" + errmsg. value )
if target == 'any' :
# retreive any RGB led
disp = YDisplay . FirstDisplay ()
if disp is None :
die ( 'No module connected' )
else :
disp = YDisplay . FindDisplay ( ".display" )
if not disp. isOnline () :
die ( "Module not connected " )
# display clean up
disp. resetAll ()
# retreive the display size
w = disp. get_displayWidth ()
h = disp. get_displayHeight ()
# retreive the first layer
l0 = disp. get_displayLayer ( 0 )
l0. clear ()
# display a text in the middle of the screen
l0. drawText ( w / 2 , h / 2 , YDisplayLayer . ALIGN . CENTER , "Hello world!" )
# visualize each corner
l0. moveTo ( 0 , 5 )
l0. lineTo ( 0 , 0 )
l0. lineTo ( 5 , 0 )
l0. moveTo ( 0 , h - 6 )
l0. lineTo ( 0 , h - 1 )
l0. lineTo ( 5 , h - 1 )
l0. moveTo ( w - 1 , h - 6 )
l0. lineTo ( w - 1 , h - 1 )
l0. lineTo ( w - 6 , h - 1 )
l0. moveTo ( w - 1 , 5 )
l0. lineTo ( w - 1 , 0 )
l0. lineTo ( w - 6 , 0 )
# draw a circle in the top left corner of layer 1
l1 = disp. get_displayLayer ( 1 )
l1. clear ()
l1. drawCircle ( h / 8 , h / 8 , h / 8 )
# and animate the layer
print( "Use Ctrl-C to stop" )
x = 0
y = 0
vx = 1
vy = 1
while disp. isOnline () :
x + = vx
y + = vy
if x < 0 or x > w - ( h / 4 ) :
vx = -vx
17. Using the Yocto-Display with Python
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