Async callback support in nrf connect i2c drivers

RE: Async callback support in nrf connect i2c drivers

Naeem Maroof — Wed, 24 Jul 2024 12:36:37 GMT

Hi Anthony,

You may like to look at NRFX TWI sample that demonstrates the functionality of TWIM and TWIS in the non-blocking mode: NRFX TWIM/TWIS Non-Blocking Sample

Regards,

Naeem

RE: Async callback support in nrf connect i2c drivers

Anthony Ambuehl — Fri, 19 Jul 2024 16:59:09 GMT

The zephyr i2c.h provides an API template for async (callback) operations, however Nordic's drivers do not implement the API function for the async/callback operation.

Also Zephyr's API for async/callback does not easily support flexible queueing like work queues since the parameters are passed as distinct arguments instead of in a static/persistent data structure which could include space for an slist node or a worker.

Without the queueing yes the operations may be non-blocking (depending on the implementation), but they will fail with an error if the driver is busy with another operation, and then the driver itself would need to implement a retry through some other queuing mechanism such as a work queue.

RE: Async callback support in nrf connect i2c drivers

Jared — Fri, 19 Jul 2024 11:51:20 GMT

Hi there,

We have not ported the twi_manager lib to Zephyr. But if the only feature that you want is to do non-blocking read/writes then you can use the Zephyr I2C lib, as it supports async read/writes,

regards

Jared