Update I2C _wakeup to come out of power_down

`_wakeup` also puts the pn532 back into normal mode.

adafruit_pn532/i2c.py

@@ -41,7 +41,7 @@ import time
 import adafruit_bus_device.i2c_device as i2c_device
 from digitalio import Direction
 from micropython import const
-from adafruit_pn532.adafruit_pn532 import PN532, BusyError, _reset
+from adafruit_pn532.adafruit_pn532 import PN532, BusyError
 
 _I2C_ADDRESS = const(0x24)
 
@@ -55,23 +55,23 @@ class PN532_I2C(PN532):
         reset pin and debugging output.
         """
         self.debug = debug
-        self._irq = irq
         self._req = req
-        if reset:
-            _reset(reset)
         self._i2c = i2c_device.I2CDevice(i2c, _I2C_ADDRESS)
-        super().__init__(debug=debug, reset=reset)
+        super().__init__(debug=debug, irq=irq, reset=reset)
 
     def _wakeup(self):  # pylint: disable=no-self-use
         """Send any special commands/data to wake up PN532"""
+        if self._reset_pin:
+            self._reset_pin.value = True
+            time.sleep(0.01)
         if self._req:
             self._req.direction = Direction.OUTPUT
-            self._req.value = True
-            time.sleep(0.1)
             self._req.value = False
-            time.sleep(0.1)
+            time.sleep(0.01)
             self._req.value = True
-        time.sleep(0.5)
+            time.sleep(0.01)
+        self.low_power = False
+        self.SAM_configuration() # Put the PN532 back in normal mode
 
     def _wait_ready(self, timeout=1):
         """Poll PN532 if status byte is ready, up to `timeout` seconds"""
@@ -82,11 +82,10 @@ class PN532_I2C(PN532):
                 with self._i2c:
                     self._i2c.readinto(status)
             except OSError:
-                self._wakeup()
                 continue
             if status == b"\x01":
                 return True  # No longer busy
-            time.sleep(0.05)  # lets ask again soon!
+            time.sleep(0.01)  # lets ask again soon!
         # Timed out!
         return False
 
@@ -101,8 +100,6 @@ class PN532_I2C(PN532):
             i2c.readinto(frame)  # ok get the data, plus statusbyte
         if self.debug:
             print("Reading: ", [hex(i) for i in frame[1:]])
-        else:
-            time.sleep(0.1)
         return frame[1:]  # don't return the status byte
 
     def _write_data(self, framebytes):