Issue with connecting multiple i2c devices to the same chip

[ftmazzone]

First of all, thank you for maintaining this crate !

I have two i2c sensors that I would like to connect to the chip:

• https://docs.rs/bme680/latest/bme680/
• https://docs.rs/veml7700/latest/veml7700/

I am able to get data when using one chip but when connecting both i2c devices but did not succeed to reuse the i2c variable to read data from the second sensor as it has been moved previously.
Do you know if this is a supported scenario or if there is any example to connect multiple HAL i2c devices ?

[newAM]

Sorry for the slow reply.

This isn't possible with this crate as-is, an external wrapper could be made to share the i2c bus.

I think it would also make sense to change this crate to allow multiple calls to i2c() to get multiple copies of the bus for each device (same for SPI), short term you could remove the allocate_pin calls in i2c::new to enable calling it twice. Long term I need to think about a more ergonomic solution.

[ftmazzone]

No worry, thanks for your answer.

For the time being, I've found a solution using embedded_hal_bus::util::AtomicCell. I've written an example in a sample repository

A nice feature, if the ftdi library allows it, would to implement the trait Send to allow starting the function in its own thread. As a workaround, I've used a function pointer as a workaround but maybe there is a better solution?