kumi/MicroPython_PN532
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add reset

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This commit is contained in:
ladyada 2018-08-24 14:36:52 -04:00
parent 76a7ff5aab
commit fce5b57918
1 changed files with 28 additions and 8 deletions
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36
adafruit_pn532.py
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@ -20,10 +20,8 @@
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE. # SOFTWARE.
#import binascii
#from functools import reduce
#import logging
import time import time
from digitalio import DigitalInOut, Direction
import adafruit_bus_device.i2c_device as i2c_device import adafruit_bus_device.i2c_device as i2c_device
import adafruit_bus_device.spi_device as spi_device import adafruit_bus_device.spi_device as spi_device
@ -157,7 +155,7 @@ class PN532_I2C(object):
PN532 (see: http://www.raspberrypi.org/forums/viewtopic.php?f=32&t=98070&p=720659#p720659) PN532 (see: http://www.raspberrypi.org/forums/viewtopic.php?f=32&t=98070&p=720659#p720659)
""" """
def __init__(self, i2c, irq=None, *, debug=False): def __init__(self, i2c, *, irq=None, reset=None, debug=False):
"""Create an instance of the PN532 class using either software SPI (if """Create an instance of the PN532 class using either software SPI (if
the sclk, mosi, and miso pins are specified) or hardware SPI if a the sclk, mosi, and miso pins are specified) or hardware SPI if a
spi parameter is passed. The cs pin must be a digital GPIO pin. spi parameter is passed. The cs pin must be a digital GPIO pin.
@ -165,8 +163,17 @@ class PN532_I2C(object):
the board's GPIO pins. the board's GPIO pins.
""" """
self.debug = debug self.debug = debug
self._i2c = i2c_device.I2CDevice(i2c, _I2C_ADDRESS)
self._irq = irq self._irq = irq
if reset:
print("resetting")
reset.direction = Direction.OUTPUT
reset.value = True
time.sleep(0.1)
reset.value = False
time.sleep(0.1)
reset.value = True
time.sleep(1)
self._i2c = i2c_device.I2CDevice(i2c, _I2C_ADDRESS)
try: try:
self.get_firmware_version() # first time often fails, try 2ce self.get_firmware_version() # first time often fails, try 2ce
return return
@ -208,9 +215,9 @@ class PN532_I2C(object):
# Build a read request frame. # Build a read request frame.
frame = bytearray(count) frame = bytearray(count)
with self._i2c: with self._i2c:
self._i2c.readinto(frame, end=1) # read ready byte! #self._i2c.readinto(frame, end=1) # read ready byte!
if frame[0] != 0x01: # not ready #if frame[0] != 0x01: # not ready
raise BusyError # raise BusyError
self._i2c.readinto(frame) self._i2c.readinto(frame)
if self.debug: if self.debug:
print("Reading: ", [hex(i) for i in frame]) print("Reading: ", [hex(i) for i in frame])
@ -256,6 +263,19 @@ class PN532_I2C(object):
if self._irq: if self._irq:
print("TODO IRQ") print("TODO IRQ")
else: else:
"""
status = bytearray(1)
t = time.monotonic()
while (time.monotonic() - t) < timeout:
with self._i2c:
self._i2c.readinto(status)
if status == b'\0x01':
print(".ready.")
return True
else:
time.sleep(0.1)
print(".busy.")
"""
time.sleep(timeout) time.sleep(timeout)
return True return True