I2C does not work after save (Espruino Pico)

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Gordon
So you're saying that middle waveform (with just the small spike) is the one from running the onInit code?

And you have hardware pullups on the I2C bus - if not that can be an issue since I don't think Espruino is able to use the internal pullup on STM32s, and software I2C can.

I can try checking with an I2C device on B6/B7 here and see if I can reproduce it. What happens if you do:
```
function onInit()
{
  setTimeout(function() {
    I2C1.setup({ scl : B6, sda: B7 });
  }, 1000);
  LED1.reset();
  LED2.reset();
  setTimeout(init,2000);
}
```
Just a note on hardware vs software I2C though - when using hardware, the software kicks off the I2C transmission, but then just busy-waits until it's finished - so you're not really saving many CPU cycles by going hardware vs software - it just means the waveform is a bit more regular (and it can be easier to hit 400kHz).

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