st7789py.py

"""
st7789 tft driver in MicroPython based on devbis' st7789py_mpy module from
https://github.com/devbis/st7789py_mpy.

I added support for display rotation, scrolling and drawing text using 8 and 16
bit wide bitmap fonts with heights that are multiples of 8.  Included are 12
bitmap fonts derived from classic pc text mode fonts.
"""

import time
from micropython import const
import ustruct as struct

# commands
ST7789_NOP = const(0x00)
ST7789_SWRESET = const(0x01)
ST7789_RDDID = const(0x04)
ST7789_RDDST = const(0x09)

ST7789_SLPIN = const(0x10)
ST7789_SLPOUT = const(0x11)
ST7789_PTLON = const(0x12)
ST7789_NORON = const(0x13)

ST7789_INVOFF = const(0x20)
ST7789_INVON = const(0x21)
ST7789_DISPOFF = const(0x28)
ST7789_DISPON = const(0x29)
ST7789_CASET = const(0x2A)
ST7789_RASET = const(0x2B)
ST7789_RAMWR = const(0x2C)
ST7789_RAMRD = const(0x2E)

ST7789_PTLAR = const(0x30)
ST7789_VSCRDEF = const(0x33)
ST7789_COLMOD = const(0x3A)
ST7789_MADCTL = const(0x36)
ST7789_VSCSAD = const(0x37)

ST7789_MADCTL_MY = const(0x80)
ST7789_MADCTL_MX = const(0x40)
ST7789_MADCTL_MV = const(0x20)
ST7789_MADCTL_ML = const(0x10)
ST7789_MADCTL_BGR = const(0x08)
ST7789_MADCTL_MH = const(0x04)
ST7789_MADCTL_RGB = const(0x00)

ST7789_RDID1 = const(0xDA)
ST7789_RDID2 = const(0xDB)
ST7789_RDID3 = const(0xDC)
ST7789_RDID4 = const(0xDD)

COLOR_MODE_65K = const(0x50)
COLOR_MODE_262K = const(0x60)
COLOR_MODE_12BIT = const(0x03)
COLOR_MODE_16BIT = const(0x05)
COLOR_MODE_18BIT = const(0x06)
COLOR_MODE_16M = const(0x07)

# Color definitions
BLACK = const(0x0000)
BLUE = const(0x001F)
RED = const(0xF800)
GREEN = const(0x07E0)
CYAN = const(0x07FF)
MAGENTA = const(0xF81F)
YELLOW = const(0xFFE0)
WHITE = const(0xFFFF)

_ENCODE_PIXEL = ">H"
_ENCODE_POS = ">HH"
_DECODE_PIXEL = ">BBB"

_BUFFER_SIZE = const(256)

_BIT7 = const(0x80)
_BIT6 = const(0x40)
_BIT5 = const(0x20)
_BIT4 = const(0x10)
_BIT3 = const(0x08)
_BIT2 = const(0x04)
_BIT1 = const(0x02)
_BIT0 = const(0x01)

def color565(red, green=0, blue=0):
    """
    Convert red, green and blue values (0-255) into a 16-bit 565 encoding.
    """
    try:
        red, green, blue = red  # see if the first var is a tuple/list
    except TypeError:
        pass
    return (red & 0xf8) << 8 | (green & 0xfc) << 3 | blue >> 3

def _encode_pos(x, y):
    """Encode a postion into bytes."""
    return struct.pack(_ENCODE_POS, x, y)

def _encode_pixel(color):
    """Encode a pixel color into bytes."""
    return struct.pack(_ENCODE_PIXEL, color)

class ST7789():
    """
    ST7789 driver class

    Args:
        spi (spi): spi object
        width (int): display width
        height (int): display height
        reset (pin): reset pin
        dc (pin): dc pin
        cs (pin): cs pin
        backlight(pin): backlight pin
        xstart (int): display xstart offset
        ystart (int): display ystart offset
        rotation (int): display rotation
    """
    def __init__(self, spi, width, height, reset, dc, cs=None, backlight=None,
                 xstart=-1, ystart=-1, rotation=0):
        """
        Initialize display.
        """
        if (width, height) != (240, 240) and (width, height) != (135, 240):
            raise ValueError(
                "Unsupported display. Only 240x240 and 135x240 are supported."
            )

        self._display_width = self.width = width
        self._display_height = self.height = height
        self.spi = spi
        self.reset = reset
        self.dc = dc
        self.cs = cs
        self.backlight = backlight
        self._rotation = rotation % 4
        self.xstart = xstart
        self.ystart = ystart

        self.hard_reset()
        self.soft_reset()
        self.sleep_mode(False)

        self._set_color_mode(COLOR_MODE_65K|COLOR_MODE_16BIT)
        time.sleep_ms(50)
        self.rotation(self._rotation)
        self.inversion_mode(True)
        time.sleep_ms(10)
        self.write(ST7789_NORON)
        time.sleep_ms(10)
        if backlight is not None:
            backlight.value(1)
        self.fill(0)
        self.write(ST7789_DISPON)
        time.sleep_ms(500)

    def write(self, command=None, data=None):
        """SPI write to the device: commands and data."""
        if self.cs:
            self.cs.low()

        if command is not None:
            self.dc.low()
            self.spi.write(bytes([command]))
        if data is not None:
            self.dc.high()
            self.spi.write(data)

        if self.cs:
            self.cs.high()

    def hard_reset(self):
        """
        Hard reset display.
        """
        if self.cs:
            self.cs.low()

        if self.reset:
            self.reset.high()
        time.sleep_ms(50)
        if self.reset:
            self.reset.low()
        time.sleep_ms(50)
        if self.reset:
            self.reset.high()
        time.sleep_ms(150)

        if self.cs:
            self.cs.high()

    def soft_reset(self):
        """
        Soft reset display.
        """
        self.write(ST7789_SWRESET)
        time.sleep_ms(150)

    def sleep_mode(self, value):
        """
        Enable or disable display sleep mode.

        Args:
            value (bool): if True enable sleep mode. if False disable sleep
            mode
        """
        if value:
            self.write(ST7789_SLPIN)
        else:
            self.write(ST7789_SLPOUT)

    def inversion_mode(self, value):
        """
        Enable or disable display inversion mode.

        Args:
            value (bool): if True enable inversion mode. if False disable
            inversion mode
        """
        if value:
            self.write(ST7789_INVON)
        else:
            self.write(ST7789_INVOFF)

    def _set_color_mode(self, mode):
        """
        Set display color mode.

        Args:
            mode (int): color mode
                COLOR_MODE_65K, COLOR_MODE_262K, COLOR_MODE_12BIT,
                COLOR_MODE_16BIT, COLOR_MODE_18BIT, COLOR_MODE_16M
        """
        self.write(ST7789_COLMOD, bytes([mode & 0x77]))

    def rotation(self, rotation):
        """
        Set display rotation.

        Args:
            rotation (int): 0-Portrait, 1-Landscape, 2-Inverted Portrait,
            3-Inverted Landscape
        """
        self._rotation = rotation % 4
        if self._rotation == 0:         # Portrait
            madctl = ST7789_MADCTL_RGB
            self.width = self._display_width
            self.height = self._display_height
            if self._display_width == 135:
                self.xstart = 52
                self.ystart = 40

        elif self._rotation == 1:       # Landscape
            madctl = ST7789_MADCTL_MX | ST7789_MADCTL_MV | ST7789_MADCTL_RGB
            self.width = self._display_height
            self.height = self._display_width
            if self._display_width == 135:
                self.xstart = 40
                self.ystart = 53

        elif self._rotation == 2:       # Inverted Portrait
            madctl = ST7789_MADCTL_MX | ST7789_MADCTL_MY | ST7789_MADCTL_RGB
            self.width = self._display_width
            self.height = self._display_height
            if self._display_width == 135:
                self.xstart = 53
                self.ystart = 40
        else:                           # Inverted Landscape
            madctl = ST7789_MADCTL_MV | ST7789_MADCTL_MY | ST7789_MADCTL_RGB
            self.width = self._display_height
            self.height = self._display_width
            if self._display_width == 135:
                self.xstart = 40
                self.ystart = 52

        self.write(ST7789_MADCTL, bytes([madctl]))

    def _set_columns(self, start, end):
        """
        Send CASET (column address set) command to display.

        Args:
            start (int): column start address
            end (int): column end address
        """
        if start <= end <= self.width:
            self.write(ST7789_CASET, _encode_pos(
                start+self.xstart, end + self.xstart))

    def _set_rows(self, start, end):
        """
        Send RASET (row address set) command to display.

        Args:
            start (int): row start address
            end (int): row end address
       """
        if start <= end <= self.height:
            self.write(ST7789_RASET, _encode_pos(
                start+self.ystart, end+self.ystart))

    def set_window(self, x0, y0, x1, y1):
        """
        Set window to column and row address.

        Args:
            x0 (int): column start address
            y0 (int): row start address
            x1 (int): column end address
            y1 (int): row end address
        """
        self._set_columns(x0, x1)
        self._set_rows(y0, y1)
        self.write(ST7789_RAMWR)

    def vline(self, x, y, length, color):
        """
        Draw vertical line at the given location and color.

        Args:
            x (int): x coordinate
            Y (int): y coordinate
            length (int): length of line
            color (int): 565 encoded color
        """
        self.fill_rect(x, y, 1, length, color)

    def hline(self, x, y, length, color):
        """
        Draw horizontal line at the given location and color.

        Args:
            x (int): x coordinate
            Y (int): y coordinate
            length (int): length of line
            color (int): 565 encoded color
        """
        self.fill_rect(x, y, length, 1, color)

    def pixel(self, x, y, color):
        """
        Draw a pixel at the given location and color.

        Args:
            x (int): x coordinate
            Y (int): y coordinate
            color (int): 565 encoded color
        """
        self.set_window(x, y, x, y)
        self.write(None, _encode_pixel(color))

    def blit_buffer(self, buffer, x, y, width, height):
        """
        Copy buffer to display at the given location.

        Args:
            buffer (bytes): Data to copy to display
            x (int): Top left corner x coordinate
            Y (int): Top left corner y coordinate
            width (int): Width
            height (int): Height
        """
        self.set_window(x, y, x + width - 1, y + height - 1)
        self.write(None, buffer)

    def rect(self, x, y, w, h, color):
        """
        Draw a rectangle at the given location, size and color.

        Args:
            x (int): Top left corner x coordinate
            y (int): Top left corner y coordinate
            width (int): Width in pixels
            height (int): Height in pixels
            color (int): 565 encoded color
        """
        self.hline(x, y, w, color)
        self.vline(x, y, h, color)
        self.vline(x + w - 1, y, h, color)
        self.hline(x, y + h - 1, w, color)

    def fill_rect(self, x, y, width, height, color):
        """
        Draw a rectangle at the given location, size and filled with color.

        Args:
            x (int): Top left corner x coordinate
            y (int): Top left corner y coordinate
            width (int): Width in pixels
            height (int): Height in pixels
            color (int): 565 encoded color
        """
        self.set_window(x, y, x + width - 1, y + height - 1)
        chunks, rest = divmod(width * height, _BUFFER_SIZE)
        pixel = _encode_pixel(color)
        self.dc.high()
        if chunks:
            data = pixel * _BUFFER_SIZE
            for _ in range(chunks):
                self.write(None, data)
        if rest:
            self.write(None, pixel * rest)

    def fill(self, color):
        """
        Fill the entire FrameBuffer with the specified color.

        Args:
            color (int): 565 encoded color
        """
        self.fill_rect(0, 0, self.width, self.height, color)

    def line(self, x0, y0, x1, y1, color):
        """
        Draw a single pixel wide line starting at x0, y0 and ending at x1, y1.

        Args:
            x0 (int): Start point x coordinate
            y0 (int): Start point y coordinate
            x1 (int): End point x coordinate
            y1 (int): End point y coordinate
            color (int): 565 encoded color
        """
        steep = abs(y1 - y0) > abs(x1 - x0)
        if steep:
            x0, y0 = y0, x0
            x1, y1 = y1, x1
        if x0 > x1:
            x0, x1 = x1, x0
            y0, y1 = y1, y0
        dx = x1 - x0
        dy = abs(y1 - y0)
        err = dx // 2
        if y0 < y1:
            ystep = 1
        else:
            ystep = -1
        while x0 <= x1:
            if steep:
                self.pixel(y0, x0, color)
            else:
                self.pixel(x0, y0, color)
            err -= dy
            if err < 0:
                y0 += ystep
                err += dx
            x0 += 1

    def vscrdef(self, tfa, vsa, bfa):
        """
        Set Vertical Scrolling Definition.

        To scroll a 135x240 display these values should be 40, 240, 40.
        There are 40 lines above the display that are not shown followed by
        240 lines that are shown followed by 40 more lines that are not shown.
        You could write to these areas off display and scroll them into view by
        changing the TFA, VSA and BFA values.

        Args:
            tfa (int): Top Fixed Area
            vsa (int): Vertical Scrolling Area
            bfa (int): Bottom Fixed Area
        """
        struct.pack(">HHH", tfa, vsa, bfa)
        self.write(ST7789_VSCRDEF, struct.pack(">HHH", tfa, vsa, bfa))

    def vscsad(self, vssa):
        """
        Set Vertical Scroll Start Address of RAM.

        Defines which line in the Frame Memory will be written as the first
        line after the last line of the Top Fixed Area on the display

        Example:

            for line in range(40, 280, 1):
                tft.vscsad(line)
                utime.sleep(0.01)

        Args:
            vssa (int): Vertical Scrolling Start Address

        """
        self.write(ST7789_VSCSAD, struct.pack(">H", vssa))

    def _text8(self, font, text, x0, y0, color=WHITE, background=BLACK):
        """
        Internal method to write characters with width of 8 and
        heights of 8 or 16.

        Args:
            font (module): font module to use
            text (str): text to write
            x0 (int): column to start drawing at
            y0 (int): row to start drawing at
            color (int): 565 encoded color to use for characters
            background (int): 565 encoded color to use for background
        """
        for char in text:
            ch = ord(char)
            if (font.FIRST <= ch < font.LAST
                    and x0+font.WIDTH <= self.width
                    and y0+font.HEIGHT <= self.height):

                if font.HEIGHT == 8:
                    passes = 1
                    size = 8
                    each = 0
                else:
                    passes = 2
                    size = 16
                    each = 8

                for line in range(passes):
                    idx = (ch-font.FIRST)*size+(each*line)
                    buffer = struct.pack('>64H',
                        color if font.FONT[idx] & _BIT7 else background,
                        color if font.FONT[idx] & _BIT6 else background,
                        color if font.FONT[idx] & _BIT5 else background,
                        color if font.FONT[idx] & _BIT4 else background,
                        color if font.FONT[idx] & _BIT3 else background,
                        color if font.FONT[idx] & _BIT2 else background,
                        color if font.FONT[idx] & _BIT1 else background,
                        color if font.FONT[idx] & _BIT0 else background,
                        color if font.FONT[idx+1] & _BIT7 else background,
                        color if font.FONT[idx+1] & _BIT6 else background,
                        color if font.FONT[idx+1] & _BIT5 else background,
                        color if font.FONT[idx+1] & _BIT4 else background,
                        color if font.FONT[idx+1] & _BIT3 else background,
                        color if font.FONT[idx+1] & _BIT2 else background,
                        color if font.FONT[idx+1] & _BIT1 else background,
                        color if font.FONT[idx+1] & _BIT0 else background,
                        color if font.FONT[idx+2] & _BIT7 else background,
                        color if font.FONT[idx+2] & _BIT6 else background,
                        color if font.FONT[idx+2] & _BIT5 else background,
                        color if font.FONT[idx+2] & _BIT4 else background,
                        color if font.FONT[idx+2] & _BIT3 else background,
                        color if font.FONT[idx+2] & _BIT2 else background,
                        color if font.FONT[idx+2] & _BIT1 else background,
                        color if font.FONT[idx+2] & _BIT0 else background,
                        color if font.FONT[idx+3] & _BIT7 else background,
                        color if font.FONT[idx+3] & _BIT6 else background,
                        color if font.FONT[idx+3] & _BIT5 else background,
                        color if font.FONT[idx+3] & _BIT4 else background,
                        color if font.FONT[idx+3] & _BIT3 else background,
                        color if font.FONT[idx+3] & _BIT2 else background,
                        color if font.FONT[idx+3] & _BIT1 else background,
                        color if font.FONT[idx+3] & _BIT0 else background,
                        color if font.FONT[idx+4] & _BIT7 else background,
                        color if font.FONT[idx+4] & _BIT6 else background,
                        color if font.FONT[idx+4] & _BIT5 else background,
                        color if font.FONT[idx+4] & _BIT4 else background,
                        color if font.FONT[idx+4] & _BIT3 else background,
                        color if font.FONT[idx+4] & _BIT2 else background,
                        color if font.FONT[idx+4] & _BIT1 else background,
                        color if font.FONT[idx+4] & _BIT0 else background,
                        color if font.FONT[idx+5] & _BIT7 else background,
                        color if font.FONT[idx+5] & _BIT6 else background,
                        color if font.FONT[idx+5] & _BIT5 else background,
                        color if font.FONT[idx+5] & _BIT4 else background,
                        color if font.FONT[idx+5] & _BIT3 else background,
                        color if font.FONT[idx+5] & _BIT2 else background,
                        color if font.FONT[idx+5] & _BIT1 else background,
                        color if font.FONT[idx+5] & _BIT0 else background,
                        color if font.FONT[idx+6] & _BIT7 else background,
                        color if font.FONT[idx+6] & _BIT6 else background,
                        color if font.FONT[idx+6] & _BIT5 else background,
                        color if font.FONT[idx+6] & _BIT4 else background,
                        color if font.FONT[idx+6] & _BIT3 else background,
                        color if font.FONT[idx+6] & _BIT2 else background,
                        color if font.FONT[idx+6] & _BIT1 else background,
                        color if font.FONT[idx+6] & _BIT0 else background,
                        color if font.FONT[idx+7] & _BIT7 else background,
                        color if font.FONT[idx+7] & _BIT6 else background,
                        color if font.FONT[idx+7] & _BIT5 else background,
                        color if font.FONT[idx+7] & _BIT4 else background,
                        color if font.FONT[idx+7] & _BIT3 else background,
                        color if font.FONT[idx+7] & _BIT2 else background,
                        color if font.FONT[idx+7] & _BIT1 else background,
                        color if font.FONT[idx+7] & _BIT0 else background
                    )
                    self.blit_buffer(buffer, x0, y0+8*line, 8, 8)

                x0 += 8

    def _text16(self, font, text, x0, y0, color=WHITE, background=BLACK):
        """
        Internal method to draw characters with width of 16 and heights of 16
        or 32.

        Args:
            font (module): font module to use
            text (str): text to write
            x0 (int): column to start drawing at
            y0 (int): row to start drawing at
            color (int): 565 encoded color to use for characters
            background (int): 565 encoded color to use for background
        """
        for char in text:
            ch = ord(char)
            if (font.FIRST <= ch < font.LAST
                    and x0+font.WIDTH <= self.width
                    and y0+font.HEIGHT <= self.height):

                if font.HEIGHT == 16:
                    passes = 2
                    size = 32
                    each = 16
                else:
                    passes = 4
                    size = 64
                    each = 16

                for line in range(passes):
                    idx = (ch-font.FIRST)*size+(each*line)
                    buffer = struct.pack('>128H',
                        color if font.FONT[idx] & _BIT7 else background,
                        color if font.FONT[idx] & _BIT6 else background,
                        color if font.FONT[idx] & _BIT5 else background,
                        color if font.FONT[idx] & _BIT4 else background,
                        color if font.FONT[idx] & _BIT3 else background,
                        color if font.FONT[idx] & _BIT2 else background,
                        color if font.FONT[idx] & _BIT1 else background,
                        color if font.FONT[idx] & _BIT0 else background,
                        color if font.FONT[idx+1] & _BIT7 else background,
                        color if font.FONT[idx+1] & _BIT6 else background,
                        color if font.FONT[idx+1] & _BIT5 else background,
                        color if font.FONT[idx+1] & _BIT4 else background,
                        color if font.FONT[idx+1] & _BIT3 else background,
                        color if font.FONT[idx+1] & _BIT2 else background,
                        color if font.FONT[idx+1] & _BIT1 else background,
                        color if font.FONT[idx+1] & _BIT0 else background,
                        color if font.FONT[idx+2] & _BIT7 else background,
                        color if font.FONT[idx+2] & _BIT6 else background,
                        color if font.FONT[idx+2] & _BIT5 else background,
                        color if font.FONT[idx+2] & _BIT4 else background,
                        color if font.FONT[idx+2] & _BIT3 else background,
                        color if font.FONT[idx+2] & _BIT2 else background,
                        color if font.FONT[idx+2] & _BIT1 else background,
                        color if font.FONT[idx+2] & _BIT0 else background,
                        color if font.FONT[idx+3] & _BIT7 else background,
                        color if font.FONT[idx+3] & _BIT6 else background,
                        color if font.FONT[idx+3] & _BIT5 else background,
                        color if font.FONT[idx+3] & _BIT4 else background,
                        color if font.FONT[idx+3] & _BIT3 else background,
                        color if font.FONT[idx+3] & _BIT2 else background,
                        color if font.FONT[idx+3] & _BIT1 else background,
                        color if font.FONT[idx+3] & _BIT0 else background,
                        color if font.FONT[idx+4] & _BIT7 else background,
                        color if font.FONT[idx+4] & _BIT6 else background,
                        color if font.FONT[idx+4] & _BIT5 else background,
                        color if font.FONT[idx+4] & _BIT4 else background,
                        color if font.FONT[idx+4] & _BIT3 else background,
                        color if font.FONT[idx+4] & _BIT2 else background,
                        color if font.FONT[idx+4] & _BIT1 else background,
                        color if font.FONT[idx+4] & _BIT0 else background,
                        color if font.FONT[idx+5] & _BIT7 else background,
                        color if font.FONT[idx+5] & _BIT6 else background,
                        color if font.FONT[idx+5] & _BIT5 else background,
                        color if font.FONT[idx+5] & _BIT4 else background,
                        color if font.FONT[idx+5] & _BIT3 else background,
                        color if font.FONT[idx+5] & _BIT2 else background,
                        color if font.FONT[idx+5] & _BIT1 else background,
                        color if font.FONT[idx+5] & _BIT0 else background,
                        color if font.FONT[idx+6] & _BIT7 else background,
                        color if font.FONT[idx+6] & _BIT6 else background,
                        color if font.FONT[idx+6] & _BIT5 else background,
                        color if font.FONT[idx+6] & _BIT4 else background,
                        color if font.FONT[idx+6] & _BIT3 else background,
                        color if font.FONT[idx+6] & _BIT2 else background,
                        color if font.FONT[idx+6] & _BIT1 else background,
                        color if font.FONT[idx+6] & _BIT0 else background,
                        color if font.FONT[idx+7] & _BIT7 else background,
                        color if font.FONT[idx+7] & _BIT6 else background,
                        color if font.FONT[idx+7] & _BIT5 else background,
                        color if font.FONT[idx+7] & _BIT4 else background,
                        color if font.FONT[idx+7] & _BIT3 else background,
                        color if font.FONT[idx+7] & _BIT2 else background,
                        color if font.FONT[idx+7] & _BIT1 else background,
                        color if font.FONT[idx+7] & _BIT0 else background,
                        color if font.FONT[idx+8] & _BIT7 else background,
                        color if font.FONT[idx+8] & _BIT6 else background,
                        color if font.FONT[idx+8] & _BIT5 else background,
                        color if font.FONT[idx+8] & _BIT4 else background,
                        color if font.FONT[idx+8] & _BIT3 else background,
                        color if font.FONT[idx+8] & _BIT2 else background,
                        color if font.FONT[idx+8] & _BIT1 else background,
                        color if font.FONT[idx+8] & _BIT0 else background,
                        color if font.FONT[idx+9] & _BIT7 else background,
                        color if font.FONT[idx+9] & _BIT6 else background,
                        color if font.FONT[idx+9] & _BIT5 else background,
                        color if font.FONT[idx+9] & _BIT4 else background,
                        color if font.FONT[idx+9] & _BIT3 else background,
                        color if font.FONT[idx+9] & _BIT2 else background,
                        color if font.FONT[idx+9] & _BIT1 else background,
                        color if font.FONT[idx+9] & _BIT0 else background,
                        color if font.FONT[idx+10] & _BIT7 else background,
                        color if font.FONT[idx+10] & _BIT6 else background,
                        color if font.FONT[idx+10] & _BIT5 else background,
                        color if font.FONT[idx+10] & _BIT4 else background,
                        color if font.FONT[idx+10] & _BIT3 else background,
                        color if font.FONT[idx+10] & _BIT2 else background,
                        color if font.FONT[idx+10] & _BIT1 else background,
                        color if font.FONT[idx+10] & _BIT0 else background,
                        color if font.FONT[idx+11] & _BIT7 else background,
                        color if font.FONT[idx+11] & _BIT6 else background,
                        color if font.FONT[idx+11] & _BIT5 else background,
                        color if font.FONT[idx+11] & _BIT4 else background,
                        color if font.FONT[idx+11] & _BIT3 else background,
                        color if font.FONT[idx+11] & _BIT2 else background,
                        color if font.FONT[idx+11] & _BIT1 else background,
                        color if font.FONT[idx+11] & _BIT0 else background,
                        color if font.FONT[idx+12] & _BIT7 else background,
                        color if font.FONT[idx+12] & _BIT6 else background,
                        color if font.FONT[idx+12] & _BIT5 else background,
                        color if font.FONT[idx+12] & _BIT4 else background,
                        color if font.FONT[idx+12] & _BIT3 else background,
                        color if font.FONT[idx+12] & _BIT2 else background,
                        color if font.FONT[idx+12] & _BIT1 else background,
                        color if font.FONT[idx+12] & _BIT0 else background,
                        color if font.FONT[idx+13] & _BIT7 else background,
                        color if font.FONT[idx+13] & _BIT6 else background,
                        color if font.FONT[idx+13] & _BIT5 else background,
                        color if font.FONT[idx+13] & _BIT4 else background,
                        color if font.FONT[idx+13] & _BIT3 else background,
                        color if font.FONT[idx+13] & _BIT2 else background,
                        color if font.FONT[idx+13] & _BIT1 else background,
                        color if font.FONT[idx+13] & _BIT0 else background,
                        color if font.FONT[idx+14] & _BIT7 else background,
                        color if font.FONT[idx+14] & _BIT6 else background,
                        color if font.FONT[idx+14] & _BIT5 else background,
                        color if font.FONT[idx+14] & _BIT4 else background,
                        color if font.FONT[idx+14] & _BIT3 else background,
                        color if font.FONT[idx+14] & _BIT2 else background,
                        color if font.FONT[idx+14] & _BIT1 else background,
                        color if font.FONT[idx+14] & _BIT0 else background,
                        color if font.FONT[idx+15] & _BIT7 else background,
                        color if font.FONT[idx+15] & _BIT6 else background,
                        color if font.FONT[idx+15] & _BIT5 else background,
                        color if font.FONT[idx+15] & _BIT4 else background,
                        color if font.FONT[idx+15] & _BIT3 else background,
                        color if font.FONT[idx+15] & _BIT2 else background,
                        color if font.FONT[idx+15] & _BIT1 else background,
                        color if font.FONT[idx+15] & _BIT0 else background
                    )
                    self.blit_buffer(buffer, x0, y0+8*line, 16, 8)
            x0 += font.WIDTH

    def text(self, font, text, x0, y0, color=WHITE, background=BLACK):
        """
        Draw text on display in specified font and colors. 8 and 16 bit wide
        fonts are supported.

        Args:
            font (module): font module to use.
            text (str): text to write
            x0 (int): column to start drawing at
            y0 (int): row to start drawing at
            color (int): 565 encoded color to use for characters
            background (int): 565 encoded color to use for background
        """
        if font.WIDTH == 8:
            self._text8(font, text, x0, y0, color, background)
        else:
            self._text16(font, text, x0, y0, color, background)