Compile error on ESP32 in Adafruit_I2CDevice.cpp

[Neophyte69]

I am using an ESP32 Dev Board, and trying to include RTCLib.h, which, via the Adafruit_I2CDevice, includes Wire.h

I then moved the ESP32 Wire.h folder from the ESP32 installation folder to a temp folder on another drive.

This allowed compilation to go further than original Wire.h, however, it now fails on the Adafruit_I2CDevice.cpp with the errors below:

`c:\Users\Jacques\Documents\Arduino\libraries\Adafruit_BusIO\Adafruit_I2CDevice.cpp: In constructor 'Adafruit_I2CDevice::Adafruit_I2CDevice(uint8_t, TwoWire*)':
c:\Users\xxxxxxx\Documents\Arduino\libraries\Adafruit_BusIO\Adafruit_I2CDevice.cpp:17:20: error: 'I2C_BUFFER_LENGTH' was not declared in this scope
_maxBufferSize = I2C_BUFFER_LENGTH;
^~~~~~~~~~~~~~~~~
c:\Users\Jacques\Documents\Arduino\libraries\Adafruit_BusIO\Adafruit_I2CDevice.cpp:17:20: note: suggested alternative: 'BUFFER_LENGTH'
_maxBufferSize = I2C_BUFFER_LENGTH;
^~~~~~~~~~~~~~~~~
BUFFER_LENGTH

exit status 1

Compilation error: exit status 1`

[felias-fogg]

Hi,

with the new version V1.2.0 it should work. You can download the new version from the repo. It should be available soon via the Arduino library manager.

And I believe that you do not need to move the original Wire.h library. It should be enough to exit and restart the Arduino IDE in order to clear the compilation cache, where potentially an older compiled version of the original Wire library has been stored. At least, that worked in my case.

Best,
Bernhard