Add driver for HT16K33 (8x8 matrix display).

drivers/ht16k33/ht16k33.py

@@ -0,0 +1,90 @@
+# MicroPython HT16K33 Bi-color Matrix driver, I2C interface
+
+from micropython import const
+import framebuf
+
+# commands
+HT16K33_ON = const(0x21)
+HT16K33_STANDBY = const(0x20)
+
+# register definitions
+DISPLAY_ON = const(0x81)
+DISPLAY_OFF = const(0x80)
+BLINKON0_5HZ = const(0x87)
+BLINKON1HZ = const(0x85)
+BLINKON2HZ = const(0x83)
+BLINKOFF = const(0x81)
+BRIGHTNESS = const(0xE0)
+
+# Subclassing FrameBuffer provides support for graphics primitives
+# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
+class HT16K33(framebuf.FrameBuffer):
+    @staticmethod
+    def rgb(r, g, b):
+        return int((r > 127) or (g > 127) or (b > 127))
+
+    def __init__(self, i2c, addr=0x70, color=1):
+        # color is 1..3
+        self.width = 8
+        self.height = 8
+        self.i2c = i2c
+        self.addr = addr
+        self.buffer = bytearray(16)
+        self.color = color
+        super().__init__(self.buffer, self.width, self.height, framebuf.MONO_HMSB)
+        self.reset()
+        
+    def reset(self):
+        self.write(HT16K33_ON)
+        self.write(DISPLAY_ON)
+        self.brightness(15)
+        self.clear()
+        
+    def blink_05hz(self):
+        self.write(BLINKON0_5HZ)
+        
+    def blink_1hz(self):
+        self.write(BLINKON1HZ)
+        
+    def blink_2hz(self):
+        self.write(BLINKON2HZ)
+        
+    def blink_off(self):
+        self.write(BLINKOFF)
+            
+    def clear(self):
+        self.fill(0)
+        self.show()
+
+    def poweroff(self):
+        self.write(DISPLAY_OFF)
+        self.write(HT16K33_STANDBY)
+
+    def poweron(self):
+        self.write(HT16K33_ON)
+        self.write(DISPLAY_ON)
+        self.show()
+
+    def brightness(self, brightness):
+        # brightness param is integer between 0 and 15
+        self.write(BRIGHTNESS | brightness)
+
+    def write_cmd(self, cmd):
+        self.i2c.writeto(self.addr, bytearray(cmd))
+        
+    def write(self, data):
+        self.i2c.writeto(self.addr, bytes([data]))
+        
+    def show(self):
+        temp_buffer = bytearray()
+        for index in range(8):
+            if self.color == 1:
+                temp_buffer.append(self.buffer[index])
+                temp_buffer += bytearray(1)
+            elif self.color == 2:
+                temp_buffer += bytearray(1)
+                temp_buffer.append(self.buffer[index])
+            else:
+                temp_buffer.append(self.buffer[index])
+                temp_buffer.append(self.buffer[index])
+        self.write_cmd(bytearray(1) + temp_buffer)