Jeff Epler
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43 lines
1.4 KiB
Python
43 lines
1.4 KiB
Python
#!/usr/bin/python3
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"""
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Mirror a scaled copy of the framebuffer to a 64x32 matrix
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The upper left corner of the framebuffer is displayed until the user hits ctrl-c.
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The `/dev/fb0` special file will exist if a monitor is plugged in at boot time,
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or if `/boot/firmware/cmdline.txt` specifies a resolution such as
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`... video=HDMI-A-1:640x480M@60D`.
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"""
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import adafruit_raspberry_pi5_piomatter
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import numpy as np
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yoffset = 0
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xoffset = 0
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with open("/sys/class/graphics/fb0/virtual_size") as f:
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screenx, screeny = [int(word) for word in f.read().split(",")]
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with open("/sys/class/graphics/fb0/bits_per_pixel") as f:
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bits_per_pixel = int(f.read())
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assert bits_per_pixel == 16
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bytes_per_pixel = bits_per_pixel // 8
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dtype = {2: np.uint16, 4: np.uint32}[bytes_per_pixel]
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with open("/sys/class/graphics/fb0/stride") as f:
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stride = int(f.read())
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linux_framebuffer = np.memmap('/dev/fb0',mode='r', shape=(screeny, stride // bytes_per_pixel), dtype=dtype)
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width = 64
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height = 32
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geometry = adafruit_raspberry_pi5_piomatter.Geometry(width=width, height=height, n_addr_lines=4, rotation=adafruit_raspberry_pi5_piomatter.Orientation.Normal)
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matrix_framebuffer = np.zeros(shape=(geometry.height, geometry.width), dtype=dtype)
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matrix = adafruit_raspberry_pi5_piomatter.AdafruitMatrixBonnetRGB565(matrix_framebuffer, geometry)
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while True:
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matrix_framebuffer[:,:] = linux_framebuffer[yoffset:yoffset+height, xoffset:xoffset+width]
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matrix.show()
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