Strange... but it does work intermittently? There are minor differences in the hardware, but Espruino tries quite hard to avoid them. I've definitely used I2C1 - in fact just earlier this week with a display - and it worked fine.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Strange... but it does work intermittently? There are minor differences in the hardware, but Espruino tries quite hard to avoid them. I've definitely used I2C1 - in fact just earlier this week with a display - and it worked fine.