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revise ntag2xx_read_block() to return None on failure, update example #53

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Feb 14, 2022
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revise ntag2xx_read_block() to return None on failure, update example #53

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2b09600
revise ntag2xx_read_block() to return None on failure, update example
jerryneedell Feb 14, 2022
5a91ef4
fix example
jerryneedell Feb 14, 2022
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13 changes: 7 additions & 6 deletions adafruit_pn532/adafruit_pn532.py
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Original file line number Diff line number Diff line change
Expand Up @@ -489,10 +489,11 @@ def ntag2xx_write_block(self, block_number, data):

def ntag2xx_read_block(self, block_number):
"""Read a block of data from the card. Block number should be the block
to read. If the block is successfully read a bytearray of length 16 with
data starting at the specified block will be returned. If the block is
not read then None will be returned.
to read. If the block is successfully read the first 4 bytes (after the
leading 0x00 byte) will be returned.
If the block is not read then None will be returned.
"""
return self.mifare_classic_read_block(block_number)[
0:4
] # only 4 bytes per page
ntag2xx_block = self.mifare_classic_read_block(block_number)
if ntag2xx_block is not None:
return ntag2xx_block[0:4] # only 4 bytes per page
return None
12 changes: 8 additions & 4 deletions examples/pn532_readwrite_ntag2xx.py
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,11 @@
# Write 4 byte block.
pn532.ntag2xx_write_block(6, data)
# Read block #6
print(
"Wrote to block 6, now trying to read that data:",
[hex(x) for x in pn532.ntag2xx_read_block(6)],
)
ntag2xx_block = pn532.ntag2xx_read_block(6)
if ntag2xx_block is not None:
print(
"Wrote to block 6, now trying to read that data:",
[hex(x) for x in ntag2xx_block],
)
else:
print("Read failed - did you remove the card?")