Set Device Pointer to NULL

RE: Set Device Pointer to NULL

Naeem Maroof — Thu, 30 Nov 2023 13:47:45 GMT

Yes, in NCS 2.5.0 (tagged with zephyr 3.4.0), the cs is a member of type cpi_cs_control within spi_config

but in NCS 2.4.0 (tagged with zephyr 3.3.0) the cs is a pointer to spi_cs_control within spi_config

RE: Set Device Pointer to NULL

RadicalTomato — Thu, 30 Nov 2023 09:12:46 GMT

Please provide the recommended way of setting this structure to NULL.

If using this:

I am getting the following build error:

 error: incompatible types when assigning to type 'struct spi_cs_control' from type 'void *'
   66 |         spi.config.cs = NULL;
      |                         ^~~~

the SDK is v2.5.0.

Previously the same code has been based on SDK v2.4.0 and it was building fine. Looks like there is breaking change when switching from 2.4.0 to 2.5.0 for the SPI driver.

Going into the driver header files, the change becomes obvious so yes, the build error makes sense, as there is no pointer in the struct anymore, but another struct.

Hmmm ... looks like the changes are coming from here:

Zephyr 3.4.0 — Zephyr Project documentation (nRF Connect SDK) (nordicsemi.com)

RE: Set Device Pointer to NULL

Naeem Maroof — Tue, 28 Nov 2023 11:46:36 GMT

Hello,

Thank you for contacting DevZone at NordicSemi.

The spi_config struct contains the spi_cs_control struct.

So essentially you can set it in the spi configuration that you will use for the spi istance.