error: call of overloaded Wire.begin(int&, int, int)' is ambiguous

[platypii]

The code in BMP180.cpp does not compile after upstream arduino-esp32 library was updated.

.pio/libdeps/heltec_wifi_lora_32_V2/Heltec ESP32 Dev-Boards/src/BMP180.cpp:13:29: error: call of overloaded 'begin(int&, int, int)' is ambiguous
   Wire.begin(sda, 12, 100000);
                             ^
In file included from .pio/libdeps/heltec_wifi_lora_32_V2/Heltec ESP32 Dev-Boards/src/BMP180.h:5,
                 from .pio/libdeps/heltec_wifi_lora_32_V2/Heltec ESP32 Dev-Boards/src/BMP180.cpp:1:
.platformio/packages/framework-arduinoespressif32/libraries/Wire/src/Wire.h:79:10: note: candidate: 'bool TwoWire::begin(int, int, uint32_t)'
     bool begin(int sda=-1, int scl=-1, uint32_t frequency=0); // returns true, if successful init of i2c bus
          ^~~~~
.platformio/packages/framework-arduinoespressif32/libraries/Wire/src/Wire.h:80:10: note: candidate: 'bool TwoWire::begin(uint8_t, int, int, uint32_t)'
     bool begin(uint8_t slaveAddr, int sda=-1, int scl=-1, uint32_t frequency=0);
          ^~~~~

I'm trying to use this library via platformio. My code worked, and was unchanged for more than 1 year. I just went back to the project, updated library versions, and now I'm getting a compile error from this library.

Specifically, in BMP180.cpp there is a call to Wire.begin.

This used to be fine. But then the underlying framework-arduinoespressif32 library was updated to add an overloaded Wire.begin function, which makes the call here ambiguous.

     bool begin(int sda=-1, int scl=-1, uint32_t frequency=0); // returns true, if successful init of i2c bus
+    bool begin(uint8_t slaveAddr, int sda=-1, int scl=-1, uint32_t frequency=0);

I tried some changes to the BMP180.cpp in this repo to see if I could fix it, but I couldn't figure out how to make the compiler know which Wire.begin function to use. I also left a comment on the arduino-esp32 repo to see if they have any suggestions.

[platypii]

Sorry, just saw this was fixed in commit 494d6b9c. Closing.

[platypii]

Reopening: seems like there hasn't been a release since June 2020, and so I can't use the fix that is already merged.

Any chance of publishing a new version 1.1.1? 🙏

[giukio]

I agree this fix is necessary.

Compiling .pio\build\heltec_wireless_stick_lite\libcc3\Heltec ESP32 Dev-Boards\heltec.cpp.o
.pio/libdeps/heltec_wireless_stick_lite/Heltec ESP32 Dev-Boards/src/BMP180.cpp: In member function 'boolean BMP085::begin(uint8_t)':
.pio/libdeps/heltec_wireless_stick_lite/Heltec ESP32 Dev-Boards/src/BMP180.cpp:12:28: error: call of overloaded 'begin(int, int, int)' is ambiguous
Wire.begin(13, 12, 100000);

[platypii]

Version 1.1.1 was published last night to the Arduino Library by @Heltec-Aaron-Lee. Thank you Aaron!!
https://www.arduino.cc/reference/en/libraries/heltec-esp32-dev-boards/

Still waiting for it to be published to the PlatformIO Registry.
https://registry.platformio.org/libraries/heltecautomation/Heltec%20ESP32%20Dev-Boards

Aaron said: "platformio is maintained by their official team for us, and I have notified them to upgrade accordingly". So I hope it will update soon. 🤞

[platypii]

Package 1.1.1 is published to PlatformIO registry! And my project now works with the latest espressif32 and Heltec ESP32 Dev-Boards packages!

THANK YOU HELTEC!! 💜 Awesome customer service

[johannes-777]

You mean you can compile with the PlatformIO Espressif 32 V4.3.0?
How is this possible? This issue is still open:
http://community.heltec.cn/t/error-compiling-example-esp32-v2/10327/3
HelTecAutomation/ESP32_LoRaWAN#79

[platypii]

Yes I am still able to compile with espressif32 4.3.0. Maybe because I'm not actually using LoRaWAN in my project?

[johannes-777]

You are right. I just compiled a minimal project with espressrif V4.3 as well.
My impression is, that heltec has pretty much deserted its roots, i.e. the boards that support LoRaWAN. I am trying to get LMIC running directly (https://github.com/mcci-catena/arduino-lmic).
To my surprise, there is already a config for Heltec boards:
https://github.com/mcci-catena/arduino-lmic/tree/master/src/hal