New answers tagged data-type
1
You can read data with :
status = mfrc522.MIFARE_Read(blockNum, readBlockData, &bufferLen);
and write data by:
status = mfrc522.MIFARE_Write(blockNum, blockData, 16);
However, there's a lot more to it, so check examples of the RFID library, or this external articles:
https://www.electronicshub.org/write-data-to-rfid-card-using-rc522-rfid/
https://...
4
The double data type is almost universally 8-bytes long, so you could
simply
#if !__AVR__
# define HAS_64_BIT_DOUBLE
#endif
Gcc provides a more specific macro though: __SIZEOF_DOUBLE__, which
has the same value as sizeof(double). But I do not know whether it is
provided by other compilers.
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