Returns a specification to start this module under a supervisor.

See Supervisor.

Clears the display to the specified grey level. Valid values for grey are from 0 (black) to 15 (whatever colour your display is). Defaults to 0.

Sets the contrast of the display. Valid values range from 0 (lowest contrast) to 255 (highest contrast).

Turns the display off.

Turns the display on.

Draws the specified bitmap. The bitmap must be in packed 4-bit greyscale format and the size of the full display as configured. For pixel format details see SSD1322.Device.draw.

Draws the specified bitmap at coordinates {x, y}. The bitmap must be in packed 4-bit greyscale format and the size corresponding to the specified width & height. For pixel format details see SSD1322.Device.draw.

Both x and width must be a multiple of 4.

Issues a reset to the SSD1322 device.

Starts a connection to an SSD1322 with the given parameters, wrapped in a GenServer to serialize access to the device. Returns an {:ok, pid} tuple where the pid is passed in to the other functions in this module.

Options are passed as a keyword list with the following possible values:

• spi_connection_opts: A nested keyword list containing any of the possible values below:

  • spi_dev: The name of the spi device to connect to. Defaults to spidev0.0
  • dc_pin: The GPIO pin number of the line to use for D/C select. Defaults to 24
  • reset_pin: The GPIO pin number of the line to use for reset. Defaults to 25
• conn: A pre-existing SSD1322.SPIConnection struct, if you already have one
• width: The width of the display in pixels. Must be a multiple of 4. Defaults to 256
• height: The height of the display in pixels. Defaults to 64