81 lines
2.5 KiB
Python
81 lines
2.5 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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Control matrix size, and orientation with command line arguments.
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python fbmirror_scaled.py [width] [height] [orientation]
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width int: Total width of matrices in pixels. Default is 64.
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height int: Total height of matrices in pixels. Default is 32.
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orientation int: Orientation in degrees, must be 0, 90, 180, or 270.
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Default is 0 or Normal orientation.
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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 sys
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import adafruit_raspberry_pi5_piomatter
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import numpy as np
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width = 64
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height = 32
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yoffset = 0
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xoffset = 0
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if len(sys.argv) >= 2:
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width = int(sys.argv[1])
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else:
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width = 64
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if len(sys.argv) >= 3:
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height = int(sys.argv[2])
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else:
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height = 32
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if len(sys.argv) >= 4:
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rotation = int(sys.argv[3])
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if rotation == 90:
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rotation = adafruit_raspberry_pi5_piomatter.Orientation.CW
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elif rotation == 180:
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rotation = adafruit_raspberry_pi5_piomatter.Orientation.R180
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elif rotation == 270:
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rotation = adafruit_raspberry_pi5_piomatter.Orientation.CCW
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elif rotation == 0:
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rotation = adafruit_raspberry_pi5_piomatter.Orientation.Normal
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else:
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raise ValueError("Invalid rotation. Must be 0, 90, 180, or 270.")
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else:
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rotation = adafruit_raspberry_pi5_piomatter.Orientation.Normal
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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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geometry = adafruit_raspberry_pi5_piomatter.Geometry(width=width, height=height, n_addr_lines=4, rotation=rotation)
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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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