uart support

Author: ladyada

adafruit_pn532.py

@@ -174,6 +174,7 @@ def __init__(self, *, debug=False, reset=None):
             reset.value = True
             time.sleep(1)
         try:
+            self._wakeup()
             self.get_firmware_version() # first time often fails, try 2ce
             return
         except:
@@ -389,6 +390,38 @@ def mifare_classic_write_block(self, block_number, data):
         return response[0] == 0x0
 
 
+class PN532_UART(PN532):
+    """Driver for the PN532 connected over Serial UART"""
+    def __init__(self, uart, *, irq=None, reset=None, debug=False):
+        """Create an instance of the PN532 class using Serial connection
+        """
+        self.debug = debug
+        self._irq = irq
+        self._uart = uart
+        super().__init__(debug=debug, reset=reset)
+
+    def _wakeup(self):
+        #self._write_frame([_HOSTTOPN532, _COMMAND_SAMCONFIGURATION, 0x01])
+        self.SAM_configuration()
+
+    def _wait_ready(self, timeout=1):
+        time.sleep(timeout)
+        return True
+
+    def _read_data(self, count):
+        """Read a specified count of bytes from the PN532."""
+        frame = self._uart.read(count)
+        if not frame:
+            raise BusyError("No data read from PN532")
+        if self.debug:
+            print("Reading: ", [hex(i) for i in frame])
+        return frame
+
+    def _write_data(self, framebytes):
+        while self._uart.read(1):  # this would be a lot nicer if we could query the # of bytes
+            pass
+        self._uart.write('\x55\x55\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00') # wake up!
+        self._uart.write(framebytes)
 
 class PN532_I2C(PN532):
     """Driver for the PN532 connected over I2C."""
@@ -404,6 +437,9 @@ def __init__(self, i2c, *, irq=None, reset=None, debug=False):
         self._i2c = i2c_device.I2CDevice(i2c, _I2C_ADDRESS)
         super().__init__(debug=debug, reset=reset)
 
+    def _wakeup(self):
+        time.sleep(0.5)
+
     def _wait_ready(self, timeout=1):
         status = bytearray(1)
         t = time.monotonic()
@@ -444,6 +480,10 @@ def __init__(self, spi, cs_pin, *, irq=None, reset=None, debug=False):
         self._spi = spi_device.SPIDevice(spi, cs_pin)
         super().__init__(debug=debug, reset=reset)
 
+    def _wakeup(self):
+        with self._spi as spi:
+            time.sleep(1)
+
     def _wait_ready(self, timeout=1):
         status = bytearray([reverse_bit(_SPI_STATREAD), 0])
 

examples/main.py

@@ -1,4 +1,36 @@
-ush=True)
+from Adafruit_Circuitpython_PN532 import adafruit_pn532
+from digitalio import DigitalInOut, Direction, Pull
+import board
+import time
+import busio
+
+reset_pin = DigitalInOut(board.D3)
+
+
+# I2C connection:
+#i2c = busio.I2C(board.SCL, board.SDA)
+#pn532 = adafruit_pn532.PN532_I2C(i2c, debug=False, reset=reset_pin)
+
+# SPI connection:
+#spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
+#cs_pin = DigitalInOut(board.D2)
+#pn532 = adafruit_pn532.PN532_SPI(spi, cs_pin, debug=False, reset=reset_pin)
+
+# UART connection
+#uart = busio.UART(board.TX, board.RX, baudrate=115200, timeout=100)
+#pn532 = adafruit_pn532.PN532_UART(uart, debug=False, reset=reset_pin)
+
+ic, ver, rev, support = pn532.get_firmware_version()
+print('Found PN532 with firmware version: {0}.{1}'.format(ver, rev))
+
+# Configure PN532 to communicate with MiFare cards 
+pn532.SAM_configuration()
+
+print('Waiting for MiFare card...')
+while True:
+    # Check if a card is available to read
+    uid = pn532.read_passive_target(timeout=0.25)
+    print('.', end="", flush=True)
     # Try again if no card is available.
     if uid is None:
         continue