Sparkfun's Qwiic joystick and keypad

python/samples/qwiic-joystick.py

@@ -0,0 +1,43 @@
+"""
+Example for Qwiic Joystick
+Available from Sparkfun.
+"""
+
+import sys
+import time
+import struct
+
+from i2cdriver import I2CDriver
+
+class Joystick:
+    def __init__(self, i2, a = 0x20):
+        self.i2 = i2
+        self.a = a
+
+    def axis(self, i):
+        self.i2.start(self.a, 0)
+        self.i2.write([i])
+        self.i2.stop()              # Note: their firmware cannot handle an I2C restart
+        self.i2.start(self.a, 1)
+        (r,) = struct.unpack(">H", self.i2.read(2))
+        self.i2.stop()
+        return r
+
+    def read(self):
+        """
+        return the joystick (x,y) position. The range is 0-1023.
+        The center position of the joystick is approximately 512.
+        """
+
+        # Note: their firmware requires two separate reads
+
+        return (self.axis(0), self.axis(2))
+
+if __name__ == '__main__':
+    i2 = I2CDriver(sys.argv[1])
+
+    d = Joystick(i2)
+
+    while 1:
+        print(d.read())
+        time.sleep(.1)

python/samples/qwiic-keypad.py

@@ -0,0 +1,44 @@
+"""
+Example for Qwiic Keypad
+Available from Sparkfun.
+"""
+
+import sys
+import time
+import struct
+
+from i2cdriver import I2CDriver
+
+class Keypad:
+    def __init__(self, i2, a = 0x4b):
+        self.i2 = i2
+        self.a = a
+
+    def read_ts(self):
+        """
+        Return (key, timestamp) if pressed, or None.
+        """
+
+        self.i2.start(self.a, 1)
+        (k, age_in_ms) = struct.unpack(">BH", self.i2.read(3))
+        self.i2.stop()
+        if k != 0:
+            return (chr(k), time.time() - age_in_ms * .001)
+        else:
+            return None
+
+    def read(self):
+        r = self.read_ts()
+        if r:
+            return r[0]
+        else:
+            return None
+
+if __name__ == '__main__':
+    i2 = I2CDriver(sys.argv[1])
+
+    d = Keypad(i2)
+
+    while 1:
+        print(d.read())
+        time.sleep(.1)