Setting up the i2c_bitbang functions in zephyr/drivers/i2c/i2c_bitbang.cpp

[michel-ann]

I am trying to use the functions outlined by this file, but I am a little confused about how to initialize everything. All of the functions use a *struct i2c_bitbang context, which is the struct given in the header file. My question is, how should I set up the struct? I am just confused on what it wants for the *void io_context field and how to declare the second *struct i2c_bitbang_io io field.
Any help / clarification would be much appreciated. Thank you!

[yashi]

The file drivers/i2c/i2c_bitbang.c is a low level driver. You don't directly use it. Rather, you should use API provided by include/drivers/i2c.h.

So to answer your question:

how should I set up the [struct i2c_bitbang *context] struct?

You don't. High level drivers, such as drivers/i2c/i2c_gpio.c, does.

$ git grep i2c_bitbang_init
drivers/i2c/i2c_bitbang.c:void i2c_bitbang_init(struct i2c_bitbang *context,
drivers/i2c/i2c_bitbang.h:void i2c_bitbang_init(struct i2c_bitbang *bitbang,
drivers/i2c/i2c_gpio.c: i2c_bitbang_init(&context->bitbang, &io_fns, context);
drivers/i2c/i2c_litex.c:        i2c_bitbang_init(bitbang, &i2c_litex_bitbang_io, (void *)config);
drivers/i2c/i2c_sbcon.c:        i2c_bitbang_init(&context->bitbang, &io_fns, config->sbcon);