--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.hgignore	Tue Jun 28 13:40:20 2016 +0200
@@ -0,0 +1,14 @@
+syntax: glob
+*.pyc
+*~
+.*.swp
+docs/_build/*
+build/*
+dist/*
+bin/*
+lib/*
+include/*
+local
+*.egg-info
+cache/*
+*.DS_Store

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max7219.py	Tue Jun 28 13:40:20 2016 +0200
@@ -0,0 +1,73 @@
+_NOOP = const(0)
+_DIGIT0 = const(1)
+_DIGIT1 = const(2)
+_DIGIT2 = const(3)
+_DIGIT3 = const(4)
+_DIGIT4 = const(5)
+_DIGIT5 = const(6)
+_DIGIT6 = const(7)
+_DIGIT7 = const(8)
+_DECODEMODE = const(9)
+_INTENSITY = const(10)
+_SCANLIMIT = const(11)
+_SHUTDOWN = const(12)
+_DISPLAYTEST = const(15)
+
+
+class Matrix8x8:
+    def __init__(self, spi, cs):
+        """
+        Driver for a single MAX7219-based LED matrix.
+
+        >>> import max7219
+        >>> from machine import Pin, SPI
+        >>> spi = SPI(10000000, miso=Pin(12), mosi=Pin(13), sck=Pin(14))
+        >>> display = max7219.Matrix8x8(spi, Pin(2))
+        >>> display.fill(True)
+        >>> display.pixel(4, 4, False)
+        >>> display.show()
+
+        """
+        self.spi = spi
+        self.cs = cs
+        self.cs.init(cs.OUT, True)
+        self.buffer = bytearray(8)
+        self.init()
+
+    def _register(self, command, data):
+        self.cs.low()
+        self.spi.write(bytearray([command, data]))
+        self.cs.high()
+
+    def init(self):
+        for command, data in (
+            (_SHUTDOWN, 0),
+            (_DISPLAYTEST, 0),
+            (_SCANLIMIT, 7),
+            (_DECODEMODE, 0),
+            (_SHUTDOWN, 1),
+        ):
+            self._register(command, data)
+
+    def brightness(self, value):
+        if not 0<= value <= 15:
+            raise ValueError("Brightness out of range")
+        self._register(_INTENSITY, value)
+
+    def fill(self, color):
+        data = 0xff if color else 0x00
+        for y in range(8):
+            self.buffer[y] = data
+
+    def pixel(self, x, y, color=None):
+        if color is None:
+            return bool(self.buffer[y] & 1 << x)
+        elif color:
+            self.buffer[y] |= 1 << x
+        else:
+            self.buffer[y] &= ~(1 << x)
+
+    def show(self):
+        for y in range(8):
+            self._register(_DIGIT0 + y, self.buffer[y])
+