nRF5340 i2c peripheral definitions

[garrettb]

Hi

Apologies in advance if my terminology is all wrong for the following question.

I am trying to write some i2c functions that will compile / work for any of I2C peripherals specified in the device tree.

My starting point is the Peripheral UART project for the nRF5340 DK.

In this case, I have added a definition for I2C2 in an overlay file.
So. in my code, I can reference “i2c1” and “i2c2”.

For example:

i2c_dev = DEVICE_DT_GET(DT_NODELABEL(i2c1));

If I reference i2c0, the build fails.

For example:

i2c_dev = DEVICE_DT_GET(DT_NODELABEL(i2c0));

Build fails:

undefined reference to `__device_dts_ord_85'

Question: Is there any way to check at run time whether, say, i2c0 peripheral has been defined in the device tree, so that the code builds etc.?

I tried this:

if (DT_NODE_EXISTS(i2c0)) {
// do something
}

But that returns false for all the i2c peripherals.

I know this is probably because I am mixing up nodes, and node labels, or something like that.

Thanks.

Garrett

[Øivind]

Hi,

Try something like:

#if DT_NODE_HAS_STATUS(DT_NODELABEL(i2c0), okay)
// do something
#endif

[garrettb]

Thank you. Yes, that works.