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| USBD480 with Python. Basic examples. http://forum.lcdinfo.com/viewtopic.php?f=19&t=2563 |
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| Author: | Henri [ Fri Jan 02, 2009 16:25 ] |
| Post subject: | USBD480 with Python. Basic examples. |
I thought I'd post a very basic example of how the USBD480 can be used with Python. This example uses the Windows API DLL but if there is interest in a similar example for some other OS let me know. This example just defines a basic interface to the display and creates a framebuffer in memory and draws some very simple things to it. Then this framebuffer is sent to the display. Code: from ctypes import *
import numpy class DisplayInfo(Structure): _fields_ = [("Width", c_uint), ("Height", c_uint), ("PixelFormat", c_uint), ("Name", c_char * 32), ("UName", c_char * 16), ("Handle", c_uint), ("Version", c_uint)] USBD480_GetNumberOfDisplays = windll.USBD480_lib.USBD480_GetNumberOfDisplays USBD480_GetNumberOfDisplays.restype = c_uint USBD480_GetDisplayConfiguration = windll.USBD480_lib.USBD480_GetDisplayConfiguration USBD480_GetDisplayConfiguration.restype = c_uint USBD480_GetDisplayConfiguration.argtypes = [c_uint, POINTER(DisplayInfo)] USBD480_Open = windll.USBD480_lib.USBD480_Open USBD480_Open.restype = c_uint USBD480_Open.argtypes = [POINTER(DisplayInfo), c_uint] USBD480_Close = windll.USBD480_lib.USBD480_Close USBD480_Close.restype = c_uint USBD480_Close.argtypes = [POINTER(DisplayInfo)] USBD480_DrawFullScreen = windll.USBD480_lib.USBD480_DrawFullScreen USBD480_DrawFullScreen.restype = c_uint USBD480_DrawFullScreen.argtypes = [POINTER(DisplayInfo), POINTER(c_char)] USBD480_DrawFullScreenRGB32 = windll.USBD480_lib.USBD480_DrawFullScreenRGB32 USBD480_DrawFullScreenRGB32.restype = c_uint USBD480_DrawFullScreenRGB32.argtypes = [POINTER(DisplayInfo), POINTER(c_uint)] USBD480_SetBrightness = windll.USBD480_lib.USBD480_SetBrightness USBD480_SetBrightness.restype = c_uint USBD480_SetBrightness.argtypes = [POINTER(DisplayInfo), c_uint] width = 480 height = 272 # define some basic colors, format is 0xAABBGGRR RED = 0xFF0000FF GREEN = 0xFF00FF00 BLUE = 0xFFFF0000 img = numpy.empty((width,height),numpy.uint32) # 480x272 image array img.shape=height,width img[10, 10] = BLUE # plot one point to the image img[12, 10] = BLUE # plot one point to the image img[12, 11] = BLUE # plot one point to the image img[10:21,112:224] = GREEN # draw a green rectangle disp = DisplayInfo() print USBD480_GetNumberOfDisplays() print USBD480_GetDisplayConfiguration(0, disp) print disp.Width print disp.Height print USBD480_Open(disp, 0) print USBD480_DrawFullScreenRGB32(disp, img.ctypes.data_as(POINTER(c_uint))) #print USBD480_SetBrightness(disp, 255) print USBD480_Close(disp) |
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| Author: | Henri [ Fri Jan 02, 2009 16:29 ] |
| Post subject: | |
Another example that adds a little more to the previous one by showing how the Python Imaging Library (PIL) can be used. Code: from ctypes import *
import numpy from PIL import Image class DisplayInfo(Structure): _fields_ = [("Width", c_uint), ("Height", c_uint), ("PixelFormat", c_uint), ("Name", c_char * 32), ("UName", c_char * 16), ("Handle", c_uint), ("Version", c_uint)] USBD480_GetNumberOfDisplays = windll.USBD480_lib.USBD480_GetNumberOfDisplays USBD480_GetNumberOfDisplays.restype = c_uint USBD480_GetDisplayConfiguration = windll.USBD480_lib.USBD480_GetDisplayConfiguration USBD480_GetDisplayConfiguration.restype = c_uint USBD480_GetDisplayConfiguration.argtypes = [c_uint, POINTER(DisplayInfo)] USBD480_Open = windll.USBD480_lib.USBD480_Open USBD480_Open.restype = c_uint USBD480_Open.argtypes = [POINTER(DisplayInfo), c_uint] USBD480_Close = windll.USBD480_lib.USBD480_Close USBD480_Close.restype = c_uint USBD480_Close.argtypes = [POINTER(DisplayInfo)] USBD480_DrawFullScreen = windll.USBD480_lib.USBD480_DrawFullScreen USBD480_DrawFullScreen.restype = c_uint USBD480_DrawFullScreen.argtypes = [POINTER(DisplayInfo), POINTER(c_char)] USBD480_DrawFullScreenRGB32 = windll.USBD480_lib.USBD480_DrawFullScreenRGB32 USBD480_DrawFullScreenRGB32.restype = c_uint USBD480_DrawFullScreenRGB32.argtypes = [POINTER(DisplayInfo), POINTER(c_uint)] USBD480_SetBrightness = windll.USBD480_lib.USBD480_SetBrightness USBD480_SetBrightness.restype = c_uint USBD480_SetBrightness.argtypes = [POINTER(DisplayInfo), c_uint] width = 480 height = 272 # define some basic colors, format is 0xAABBGGRR RED = 0xFF0000FF GREEN = 0xFF00FF00 BLUE = 0xFFFF0000 img = numpy.empty((width,height),numpy.uint32) # 480x272 image array img.shape=height,width img[10, 10] = BLUE # plot one point to the image img[12, 10] = BLUE # plot one point to the image img[12, 11] = BLUE # plot one point to the image img[10:21,112:224] = GREEN # draw a green rectangle #pilimg = Image.new('RGBA', (480,272)) pilImage = Image.fromarray(img,'RGBA') # load the numpy array as a PIL image pilImage.save('my.png') # save to disk pilImage.putpixel((100,100), (255,255,255,255)) # set a white pixel to 100, 100 image2 = Image.open('rgba.png') # load image from disk pilImage.paste(image2, (190,110)) # paste this image to the buffer arr = numpy.asarray(pilImage) # get a numpy array from the PIL image buffer disp = DisplayInfo() print USBD480_GetNumberOfDisplays() print USBD480_GetDisplayConfiguration(0, disp) print disp.Width print disp.Height print USBD480_Open(disp, 0) #print USBD480_DrawFullScreenRGB32(disp, img.ctypes.data_as(POINTER(c_uint))) print USBD480_DrawFullScreenRGB32(disp, arr.ctypes.data_as(POINTER(c_uint))) #print USBD480_SetBrightness(disp, 255) print USBD480_Close(disp) |
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| Author: | daparix [ Tue Feb 05, 2013 10:58 ] |
| Post subject: | Re: USBD480 with Python. Basic examples. |
can we get some explicit example with Linux OS? thanks |
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