framebufferio

Native framebuffer display driving

The framebufferio module contains classes to manage display output including synchronizing with refresh rates and partial updating. It is used in conjunction with classes from displayio to actually place items on the display; and classes like RGBMatrix to actually drive the display.

class framebufferio.FramebufferDisplay(framebuffer: rgbmatrix.RGBMatrix, *, rotation: int = 0, auto_refresh: bool = True)

Manage updating a display with framebuffer in RAM

This initializes a display and connects it into CircuitPython. Unlike other objects in CircuitPython, Display objects live until displayio.release_displays() is called. This is done so that CircuitPython can use the display itself.

auto_refresh :bool

True when the display is refreshed automatically.

brightness :float

The brightness of the display as a float. 0.0 is off and 1.0 is full brightness. When auto_brightness is True, the value of brightness will change automatically. If brightness is set, auto_brightness will be disabled and will be set to False.

auto_brightness :bool

True when the display brightness is adjusted automatically, based on an ambient light sensor or other method. Note that some displays may have this set to True by default, but not actually implement automatic brightness adjustment. auto_brightness is set to False if brightness is set manually.

width :int
height :int
rotation :int

The rotation of the display as an int in degrees.

framebuffer :rgbmatrix.RGBMatrix
show(self, group: displayio.Group)

Switches to displaying the given group of layers. When group is None, the default CircuitPython terminal will be shown.

Parameters:group (Group) – The group to show.
refresh(self, *, target_frames_per_second: int = 60, minimum_frames_per_second: int = 1)

When auto refresh is off, waits for the target frame rate and then refreshes the display, returning True. If the call has taken too long since the last refresh call for the given target frame rate, then the refresh returns False immediately without updating the screen to hopefully help getting caught up.

If the time since the last successful refresh is below the minimum frame rate, then an exception will be raised. Set minimum_frames_per_second to 0 to disable.

When auto refresh is on, updates the display immediately. (The display will also update without calls to this.)

Parameters:
  • target_frames_per_second (int) – How many times a second refresh should be called and the screen updated.
  • minimum_frames_per_second (int) – The minimum number of times the screen should be updated per second.
fill_row(self, y: int, buffer: WriteableBuffer)

Extract the pixels from a single row

Parameters:
  • y (int) – The top edge of the area
  • buffer (bytearray) – The buffer in which to place the pixel data