1  # A simple echo test for the Feather M0 Bluefruit
 2  # Sets the name, then echo's all RX'd data with a reversed packet
 3  
 4  import time
 5  import busio
 6  import board
 7  from digitalio import DigitalInOut
 8  from adafruit_bluefruitspi import BluefruitSPI
 9  
10  spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
11  cs = DigitalInOut(board.D8)
12  irq = DigitalInOut(board.D7)
13  rst = DigitalInOut(board.D4)
14  bluefruit = BluefruitSPI(spi_bus, cs, irq, rst, debug=False)
15  
16  # Initialize the device and perform a factory reset
17  print("Initializing the Bluefruit LE SPI Friend module")
18  bluefruit.init()
19  bluefruit.command_check_OK(b"AT+FACTORYRESET", delay=1)
20  
21  # Print the response to 'ATI' (info request) as a string
22  print(str(bluefruit.command_check_OK(b"ATI"), "utf-8"))
23  
24  # Change advertised name
25  bluefruit.command_check_OK(b"AT+GAPDEVNAME=BlinkaBLE")
26  
27  while True:
28      print("Waiting for a connection to Bluefruit LE Connect ...")
29      # Wait for a connection ...
30      dotcount = 0
31      while not bluefruit.connected:
32          print(".", end="")
33          dotcount = (dotcount + 1) % 80
34          if dotcount == 79:
35              print("")
36          time.sleep(0.5)
37  
38      # Once connected, check for incoming BLE UART data
39      print("\n *Connected!*")
40      connection_timestamp = time.monotonic()
41      while True:
42          # Check our connection status every 3 seconds
43          if time.monotonic() - connection_timestamp > 3:
44              connection_timestamp = time.monotonic()
45              if not bluefruit.connected:
46                  break
47  
48          # OK we're still connected, see if we have any data waiting
49          resp = bluefruit.uart_rx()
50          if not resp:
51              continue  # nothin'
52          print("Read %d bytes: %s" % (len(resp), resp))
53          # Now write it!
54          print("Writing reverse...")
55          send = []
56          for i in range(len(resp), 0, -1):
57              send.append(resp[i - 1])
58          print(bytes(send))
59          bluefruit.uart_tx(bytes(send))
60  
61      print("Connection lost.")