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

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This commit is contained in:
jerryneedell 2022-02-14 16:54:06 -05:00
parent dea8f14cf1
commit 2b096008e7
2 changed files with 15 additions and 10 deletions
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13
adafruit_pn532/adafruit_pn532.py
View file

@ -489,10 +489,11 @@ class PN532:
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
examples/pn532_readwrite_ntag2xx.py
View file

@ -67,7 +67,11 @@ data[0:4] = b"\xFE\xED\xBE\xEF"
# 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 pn532.ntag2xx_read_block(6)],
)
else:
print("Read failed - did you remove the card?")