Added getKeys() method to read key presses recorded by HT16K33 keyscan

Adafruit_LEDBackpack/Adafruit_LEDBackpack.py

@@ -16,6 +16,9 @@ class LEDBackpack:
   __HT16K33_REGISTER_SYSTEM_SETUP         = 0x20
   __HT16K33_REGISTER_DIMMING              = 0xE0
 
+  # Data base addresses
+  __HT16K33_ADDRESS_KEY_DATA              = 0x40
+
   # Blink rate
   __HT16K33_BLINKRATE_OFF                 = 0x00
   __HT16K33_BLINKRATE_2HZ                 = 0x01
@@ -83,11 +86,16 @@ def writeDisplay(self):
       bytes.append((item >> 8) & 0xFF)
     self.i2c.writeList(0x00, bytes)
 
+  def getKeys(self, row):
+    "Returns a row of scanned key press values as a single 13-bit value (K13:K1)"
+    if (row > 2):
+      return
+    return self.i2c.readU16(self.__HT16K33_ADDRESS_KEY_DATA + row*2)
+
   def clear(self, update=True):
     "Clears the display memory"
     self.__buffer = [ 0, 0, 0, 0, 0, 0, 0, 0 ]
     if (update):
       self.writeDisplay()
 
 led = LEDBackpack(0x70)
-