Is it possible to use EEPROM_CAT25 with an ESP32?

[scoover]

I'm successfully running EEPROM_CAT25 on a SAMD M0 microcontroller. I'm trying to port that code to an Adafruit ESP32.

The ESP32 microcontroller is not explicitly supported by this library and I get the error:

WARNING: library EEPROM_CAT25 claims to run on avr, sam, samd architecture(s) and may be incompatible with your current board which runs on esp32 architecture(s).
In file included from /Users/randy/Dropbox/Documents/Carbonator-ESP32/Carbonator-ESP32.ino:23:0:
/Volumes/Commando/Users/randy/Documents/Arduino/libraries/EEPROM_CAT25/src/EEPROM_CAT25.h:33:59: error: operator '||' has no right operand
 #if (!defined(SPI_HAS_TRANSACTION) || SPI_HAS_TRANSACTION == 0)

Is it possible to modify this library to work with the ESP32? Or is there another similar library that is compatible with the ESP32 and interfaces with the CAT25320?

Thanks, Randy

[scoover]

I think I figured this out, I'm just not totally comfortable with the solution.

The issue is that the ESP32's SPI library defines SPI_HAS TRANSACTION like this: #define SPI_HAS_TRANSACTION

When the empty definition for SPI_HAS_TRANSACTION is plugged into some preprocessor directives in EEPROM_CAT25.h, the second test (... || SPI_HAS_TRANSACTION == 0) renders as || == 0:

#if (!defined(SPI_HAS_TRANSACTION) || SPI_HAS_TRANSACTION == 0)
#error "EEPROM_CAT25 library requires SPI library transaction support (SPI_HAS_TRANSACTION = 1)"
#endif

My solution is just to comment these three lines out of EEPROM_CAT25.h. The library seems to function on my ESP32 now. Is there any reason not to resolve the problem in this way?

Thanks, Randy

[crystalcave]

I've same problem with Arduino Nano 33 IOT while it is stated that it supports SAMD processors, I will try the same approach ...

[crystalcave]

Same approach, same resulting, I will do a series of tests to understand if there are pitfalls around the corner ...