Merge pull request #3 from adafruit/examplecodepr

Updated example code in README

Author: ladyada

README.rst

@@ -31,28 +31,67 @@ Usage Example
 
 .. code-block:: python
 
+    # A simple echo test for the Feather M0 Bluefruit
+    # Sets the name, then echo's all RX'd data with a reversed packet
+
+    import time
     import busio
-    import digitalio
     import board
-
-    from adafruit_bluefruitspi import BluefruitSPI, MsgType
+    from digitalio import DigitalInOut
+    from adafruit_bluefruitspi import BluefruitSPI
 
     spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
-    cs = digitalio.DigitalInOut(board.A5)
-    irq = digitalio.DigitalInOut(board.A4)
-    bluefruit = BluefruitSPI(spi_bus, cs, irq, debug=True)
-
-    # Send the ATI command
-    try:
-        msgtype, msgid, rsp = bluefruit.cmd("ATI\n")
-        if msgtype == MsgType.ERROR:
-            print("Error (id:{0})".format(hex(msgid)))
-        if msgtype == MsgType.RESPONSE:
-            print("Response:")
-            print(rsp)
-    except RuntimeError as error:
-        print("AT command failure: " + repr(error))
-        exit()
+    cs = DigitalInOut(board.D8)
+    irq = DigitalInOut(board.D7)
+    rst = DigitalInOut(board.D4)
+    bluefruit = BluefruitSPI(spi_bus, cs, irq, rst, debug=False)
+
+    # Initialize the device and perform a factory reset
+    print("Initializing the Bluefruit LE SPI Friend module")
+    bluefruit.init()
+    bluefruit.command_check_OK(b'AT+FACTORYRESET', delay=1)
+
+    # Print the response to 'ATI' (info request) as a string
+    print(str(bluefruit.command_check_OK(b'ATI'), 'utf-8'))
+
+    # Change advertised name
+    bluefruit.command_check_OK(b'AT+GAPDEVNAME=BlinkaBLE')
+
+    while True:
+        print("Waiting for a connection to Bluefruit LE Connect ...")
+        # Wait for a connection ...
+        dotcount = 0
+        while not bluefruit.connected:
+            print(".", end="")
+            dotcount = (dotcount + 1) % 80
+            if dotcount == 79:
+                print("")
+            time.sleep(0.5)
+
+        # Once connected, check for incoming BLE UART data
+        print("\n *Connected!*")
+        connection_timestamp = time.monotonic()
+        while True:
+            # Check our connection status every 3 seconds
+            if time.monotonic() - connection_timestamp > 3:
+                connection_timestamp = time.monotonic()
+                if not bluefruit.connected:
+                    break
+
+            # OK we're still connected, see if we have any data waiting
+            resp = bluefruit.uart_rx()
+            if not resp:
+                continue  # nothin'
+            print("Read %d bytes: %s" % (len(resp), resp))
+            # Now write it!
+            print("Writing reverse...")
+            send = []
+            for i in range(len(resp), 0, -1):
+                send.append(resp[i-1])
+            print(bytes(send))
+            bluefruit.uart_tx(bytes(send))
+
+        print("Connection lost.")
 
 Contributing
 ============