Shouldn't embedded:io/SMBus extend embedded:io/I2C?

[tve]

In ECMA419 I read "The SMBus class extends the I2C class with additional methods" yet calling write() on an SMBus object produces a "no function!" exception and looking at smbus.js I don't see an implementation of write nor extension of I2C. Am I missing something?

The use-case is a TI power management chip that has a PMBus interface, which is an extension of SMBus, and it has "commands" where one just writes the command/register byte and no data. It looks like there's a non-standard sendByte() function that should do what I need...

[phoddie]

Yes, our ECMA-419 SMBus implementation should provide the read and write methods from I2C. That's an oversight and should be corrected.

It looks like there's a non-standard sendByte() function that should do what I need...

sendByte() is standard in ECMA-419 2nd Edition, which is scheduled for review and approval (I hope) at the June GA later this month. Here's the relevant section.