70 lines
2.8 KiB
Python
70 lines
2.8 KiB
Python
#!/usr/bin/python3
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"""
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Mirror a scaled copy of the framebuffer to a matrix
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A portion 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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For help with commandline arguments, run `python fbmirror.py --help`
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"""
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import click
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import numpy as np
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import adafruit_blinka_raspberry_pi5_piomatter as piomatter
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import adafruit_blinka_raspberry_pi5_piomatter.click as piomatter_click
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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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def make_pixelmap_multilane(width, height, n_addr_lines, n_lanes):
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calc_height = n_lanes << n_addr_lines
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if height != calc_height:
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raise RuntimeError(f"Calculated height {calc_height} does not match requested height {height}")
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n_addr = 1 << n_addr_lines
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m = []
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for addr in range(n_addr):
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for x in range(width):
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for lane in range(n_lanes):
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y = addr + lane * n_addr
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m.append(x + width * y)
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print(m)
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return m
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@click.command
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@click.option("--x-offset", "xoffset", type=int, help="The x offset of top left corner of the region to mirror", default=0)
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@click.option("--y-offset", "yoffset", type=int, help="The y offset of top left corner of the region to mirror", default=0)
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@piomatter_click.standard_options(n_lanes=2, n_temporal_planes=4)
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def main(xoffset, yoffset, width, height, serpentine, rotation, pinout, n_planes, n_temporal_planes, n_addr_lines, n_lanes):
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if n_lanes != 2:
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pixelmap = make_pixelmap_multilane(width, height, n_addr_lines, n_lanes)
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geometry = piomatter.Geometry(width=width, height=height, n_planes=n_planes, n_addr_lines=n_addr_lines, n_temporal_planes=n_temporal_planes, n_lanes=n_lanes, map=pixelmap)
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else:
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geometry = piomatter.Geometry(width=width, height=height, n_planes=n_planes, n_addr_lines=n_addr_lines, n_temporal_planes=n_temporal_planes, rotation=rotation)
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framebuffer = np.zeros(shape=(geometry.height, geometry.width), dtype=dtype)
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matrix = piomatter.PioMatter(colorspace=piomatter.Colorspace.RGB565, pinout=pinout, framebuffer=framebuffer, geometry=geometry)
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while True:
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framebuffer[:,:] = linux_framebuffer[yoffset:yoffset+height, xoffset:xoffset+width]
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matrix.show()
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if __name__ == '__main__':
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main()
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