adding text example.

examples/ht16k33_matrix_text_example.py

@@ -0,0 +1,45 @@
+# Basic example of using FrameBuffer to create and scroll text on the matrix.
+
+# Requires: adafruit_framebuf
+
+import board
+import busio
+import adafruit_framebuf
+
+# Import the HT16K33 LED matrix module.
+from adafruit_ht16k33 import matrix
+
+# Create the I2C interface.
+i2c = busio.I2C(board.SCL, board.SDA)
+
+# Create the matrix class.
+# This creates a 16x8 matrix:
+matrix = matrix.Matrix16x8(i2c)
+
+# Low brightness so it's easier to look at
+matrix.brightness = 0
+
+# Clear the matrix.
+matrix.fill(0)
+
+text_to_show = "Hello Blinka"
+
+# Create a framebuffer for our display
+buf = bytearray(16)  # 1 bytes tall x 16 wide = 16 bytes
+fb = adafruit_framebuf.FrameBuffer(buf, 16, 8, adafruit_framebuf.MVLSB)
+
+
+while True:
+    for i in range(len(text_to_show) * 8):
+        fb.fill(0)
+        fb.text(text_to_show, -i + 16, 0, color=1)
+        # turn all LEDs off
+        matrix.fill(0)
+        for x in range(16):
+            # using the FrameBuffer text result
+            bite = buf[x]
+            for y in range(8):
+                bit = 1 << y & bite
+                # if bit > 0 then set the pixel brightness
+                if bit:
+                    matrix[16-x, y+1] = 1