Added support for custom TwoWire interfce

[yeckel]

This change is adding support for custom I2C interface, which is useful when there are more than one in the HW. It's also enabling setting custom SDA and SCL pins and the bus frequency.

It's backward compatible and shall not break anything.

[ladyada]

thanks, this chip is discontinued...we don't have any more. how did you test these changes? :)

[yeckel]

I've some old stock in my workshop and I wanted to use them with with an esp32 mcu.
The code is:

void setup{
  Wire.begin(5,4);
  if(!mag.begin(Wire)){
..

[ladyada]

ok awesome. we can't find our HMC5883 rigth now so will leave this PR open, and test once we find the missing board :)

[TheOfficialMrBlah]

ok awesome. we can't find our HMC5883 rigth now so will leave this PR open, and test once we find the missing board :)

Are there any news yet?

This pr is now over three years old...

[g1ra]

Hi . Adafruit please when this will be merged ?