Error when compiling.

[limaomerces]

Hello. I'm using Esp32 and I used its library with the TwoWire example.

• I didn't edit
• I didn't make any changes
• I didn't add anything.
• Just opened the example and loaded it.

Got this error when compiling:

C:\Users\Tiago\Documents\Arduino\libraries\PCF8574_library-master\examples\ledEsp32OnTheSecondI2C\ledEsp32OnTheSecondI2C.ino: In function 'void setup()':
ledEsp32OnTheSecondI2C:47:28: error: call of overloaded 'begin(int, int, int)' is ambiguous
   I2Cone.begin(16,17,400000); // SDA pin 16, SCL pin 17, 400kHz frequency
                            ^
In file included from C:\Users\Tiago\Documents\Arduino\libraries\PCF8574_library-master/PCF8574.h:38,
                 from C:\Users\Tiago\Documents\Arduino\libraries\PCF8574_library-master\examples\ledEsp32OnTheSecondI2C\ledEsp32OnTheSecondI2C.ino:30:
C:\Users\Tiago\Documents\ArduinoData\packages\esp32\hardware\esp32\2.0.2\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
          ^~~~~
C:\Users\Tiago\Documents\ArduinoData\packages\esp32\hardware\esp32\2.0.2\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);
          ^~~~~
exit status 1
call of overloaded 'begin(int, int, int)' is ambiguous
`

[avillacis]

This is due to the poorly-implemented overload that implements I2C slave support in 2.0.2:

espressif/arduino-esp32#6616

In this particular case, the example sketch might be compile-fixed by using 400000U instead of 400000, in order to force the compiler to choose the overload with the explicitly-unsigned frequency parameter.

[xreef]

Hi,
yes, thanks to @avillacis for the tips.
Bye Renzo