firmata
update I2C feature to allow multiple I2C ports
It should also use a single command ID. A new command ID can be allocated so the old I2C version can be safely deprecated.
Also provide a way to frame data so that it can be sent over a series of commands in the event that the buffer exceeds the 64-byte limit.
Hi, Is this feature implemented / finished / stable? At this doc it is confusing that the 1th line says: "Currently only supports one I2C port per board" ... but a few lines under it: "A firmware implementation should support read continuous mode for several I2C devices simultaneously"
I'd like to control multiple USB+Ethernet Ardruino NANOs + multiple extended boards attached to their I2C via OpenHAB.
Thanks :) PS: Seems to be a GREAT WORK ! Congratulation.
Only 1 I2C port is supported. You can connect multiple I2C devices to a single port as long as you don't have address conflicts.
Thank you VERY much for your answer! One I2C BUS can handle max 6x (5V) or 10x (3.3V) extension boards, so 1 I2C bus is enough for me :)
Can you please extend the documentation about:
- What is the default bus number? 0? 1?
- Is it auto-discovering the attached I2C boards?
- What speed is it communicating by default? (100K of I2C >> forwarding with ? K to USB/ETH)
What is the default bus number? 0? 1?
I assume 0. Seems architecture / framework specific. For an Arduino implementation, it's whatever the default I2C bus is.
Is it auto-discovering the attached I2C boards?
No, this seems like something better handled at the application level rather than the protocol level.
What speed is it communicating by default? (100K of I2C >> forwarding with ? K to USB/ETH)
Not enforced by the protocol so the speed depends on the implementation. So for the Arduino implementation it's whatever Arduino defaults to for I2C.