added examples for map_range and shift_in/shift_out

Author: brentru

examples/map_range_demo.py

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+"""
+'map_range_demo.py'.
+
+=================================================
+maps a number from one range to another
+"""
+import time
+import simpleio
+
+while True:
+    SENSOR_VALUE = 150
+
+    # Map the sensor's range from 0<=SENSOR_VALUE<=255 to 0<=SENSOR_VALUE<=1023
+    print('original sensor value: ', SENSOR_VALUE)
+    MAPPED_VALUE = simpleio.map_range(SENSOR_VALUE, 0, 255, 0, 1023)
+    print('mapped sensor value: ', MAPPED_VALUE)
+    time.sleep(2)
+
+    # Map the new sensor value back to the old range
+    SENSOR_VALUE = simpleio.map_range(MAPPED_VALUE, 0, 1023, 0, 255)
+    print('original value returned: ', SENSOR_VALUE)
+    time.sleep(2)

examples/shift_in_out_demo.py

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+"""
+'shift_in_out_demo.py'.
+
+=================================================
+shifts data into and out of a data pin
+"""
+
+import time
+import board
+import digitalio
+import simpleio
+
+# set up clock, data, and latch pins
+CLK = digitalio.DigitalInOut(board.D12)
+CLK.direction = digitalio.Direction.OUTPUT
+DATA = digitalio.DigitalInOut(board.D11)
+LATCH = digitalio.DigitalInOut(board.D10)
+LATCH.direction = digitalio.Direction.OUTPUT
+
+while True:
+    DATA_TO_SEND = 256
+    # shifting 256 bits out of DATA pin
+    LATCH.value = False
+    DATA.direction = digitalio.Direction.OUTPUT
+    print('shifting out...')
+    simpleio.shift_out(DATA, CLK, DATA_TO_SEND, msb_first=False)
+    LATCH.value = True
+    time.sleep(3)
+
+    # shifting 256 bits into the DATA pin
+    LATCH.value = False
+    DATA.direction = digitalio.Direction.INPUT
+    print('shifting in...')
+    simpleio.shift_in(DATA, CLK)
+    time.sleep(3)