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rgb.py
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rgb.py
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import utime
import ustruct
def color565(r, g, b):
return (r & 0xf8) << 8 | (g & 0xfc) << 3 | b >> 3
class DummyPin:
"""A fake gpio pin for when you want to skip pins."""
OUT = 0
IN = 0
PULL_UP = 0
PULL_DOWN = 0
OPEN_DRAIN = 0
ALT = 0
ALT_OPEN_DRAIN = 0
LOW_POWER = 0
MED_POWER = 0
HIGH_PWER = 0
IRQ_FALLING = 0
IRQ_RISING = 0
IRQ_LOW_LEVEL = 0
IRQ_HIGH_LEVEL = 0
def __call__(self, *args, **kwargs):
return False
init = __call__
value = __call__
out_value = __call__
toggle = __call__
high = __call__
low = __call__
on = __call__
off = __call__
mode = __call__
pull = __call__
drive = __call__
irq = __call__
class Display:
_PAGE_SET = None
_COLUMN_SET = None
_RAM_WRITE = None
_RAM_READ = None
_INIT = ()
_ENCODE_PIXEL = ">H"
_ENCODE_POS = ">HH"
_DECODE_PIXEL = ">BBB"
def __init__(self, width, height):
self.width = width
self.height = height
self.init()
def init(self):
"""Run the initialization commands."""
for command, data in self._INIT:
self._write(command, data)
def _block(self, x0, y0, x1, y1, data=None):
"""Read or write a block of data."""
self._write(self._COLUMN_SET, self._encode_pos(x0, x1))
self._write(self._PAGE_SET, self._encode_pos(y0, y1))
if data is None:
size = ustruct.calcsize(self._DECODE_PIXEL)
return self._read(self._RAM_READ,
(x1 - x0 + 1) * (y1 - y0 + 1) * size)
self._write(self._RAM_WRITE, data)
def _encode_pos(self, a, b):
"""Encode a postion into bytes."""
return ustruct.pack(self._ENCODE_POS, a, b)
def _encode_pixel(self, color):
"""Encode a pixel color into bytes."""
return ustruct.pack(self._ENCODE_PIXEL, color)
def _decode_pixel(self, data):
"""Decode bytes into a pixel color."""
return color565(*ustruct.unpack(self._DECODE_PIXEL, data))
def pixel(self, x, y, color=None):
"""Read or write a pixel."""
if color is None:
return self._decode_pixel(self._block(x, y, x, y))
if not 0 <= x < self.width or not 0 <= y < self.height:
return
self._block(x, y, x, y, self._encode_pixel(color))
def fill_rectangle(self, x, y, width, height, color):
"""Draw a filled rectangle."""
x = min(self.width - 1, max(0, x))
y = min(self.height - 1, max(0, y))
w = min(self.width - x, max(1, width))
h = min(self.height - y, max(1, height))
self._block(x, y, x + w - 1, y + h - 1, b'')
chunks, rest = divmod(w * h, 512)
pixel = self._encode_pixel(color)
if chunks:
data = pixel * 512
for count in range(chunks):
self._write(None, data)
if rest:
self._write(None, pixel * rest)
def fill(self, color=0):
"""Fill whole screen."""
self.fill_rectangle(0, 0, self.width, self.height, color)
def hline(self, x, y, width, color):
"""Draw a horizontal line."""
self.fill_rectangle(x, y, width, 1, color)
def vline(self, x, y, height, color):
"""Draw a vertical line."""
self.fill_rectangle(x, y, 1, height, color)
def blit_buffer(self, buffer, x, y, width, height):
"""Copy pixels from a buffer."""
if (not 0 <= x < self.width or
not 0 <= y < self.height or
not 0 < x + width <= self.width or
not 0 < y + height <= self.height):
raise ValueError("out of bounds")
self._block(x, y, x + width - 1, y + height - 1, buffer)
class DisplaySPI(Display):
def __init__(self, spi, dc, cs=None, rst=None, width=1, height=1):
self.spi = spi
self.cs = cs
self.dc = dc
self.rst = rst
if self.rst is None:
self.rst = DummyPin()
if self.cs is None:
self.cs = DummyPin()
self.cs.init(self.cs.OUT, value=1)
self.dc.init(self.dc.OUT, value=0)
self.rst.init(self.rst.OUT, value=1)
self.reset()
super().__init__(width, height)
def reset(self):
self.rst(0)
utime.sleep_ms(50)
self.rst(1)
utime.sleep_ms(50)
def _write(self, command=None, data=None):
if command is not None:
self.dc(0)
self.cs(0)
self.spi.write(bytearray([command]))
self.cs(1)
if data is not None:
self.dc(1)
self.cs(0)
self.spi.write(data)
self.cs(1)
def _read(self, command=None, count=0):
self.dc(0)
self.cs(0)
if command is not None:
self.spi.write(bytearray([command]))
if count:
data = self.spi.read(count)
self.cs(1)
return data