Adding in drivers into zephyr

RE: Adding in drivers into zephyr

lolcatsnin — Wed, 20 Oct 2021 23:26:54 GMT

Ah ok, i was given the impression there were more hoops to be jumped haha.
thanks

RE: Adding in drivers into zephyr

Håkon Alseth — Wed, 20 Oct 2021 15:03:33 GMT

Hi,

[quote user="lolcatsnin"]whats the alternative approach [/quote]

The alternative is to implement your wanted functionality on top of a standard driver. For instance, if using a SPI based sensor, then you add the communication on top of the zephyr spi driver directly in your application.

Kind regards,

Håkon

RE: Adding in drivers into zephyr

lolcatsnin — Wed, 20 Oct 2021 13:19:48 GMT

ah ok appreciate it !! i havnt seen those pages.

whats the alternative approach

RE: Adding in drivers into zephyr

Håkon Alseth — Wed, 20 Oct 2021 11:19:14 GMT

Hi,

[quote user="lolcatsnin"]so in the case that the driver isnt a zephyr component does that make it alot harder to add in ? is there a template/ tutorial / page on the matter ?[/quote]

If the component/driver isn't already present in zephyr, and you want to add it in the "zephyr way", I'd recommend reading the zephyr documentation, and its driver model:

https://docs.zephyrproject.org/latest/reference/drivers/index.html

And the device tree:

https://docs.zephyrproject.org/latest/reference/devicetree/index.html#

Kind regards,

Håkon

RE: Adding in drivers into zephyr

lolcatsnin — Wed, 20 Oct 2021 09:51:08 GMT

ah ok, thanks for your advice ! i was thinking about just ripping/copying out one of the other drivers that im familiar with and attempting to swap out and integrate it if required but i cant seem to find much on the matter on what is required to nicely have things fit in haha.

RE: Adding in drivers into zephyr

lolcatsnin — Wed, 20 Oct 2021 09:48:29 GMT

Sorry for the delay. oh ok, so just to reitterate
CONFIG_NETWORKING=y
CONFIG_NET_L2_ETHERNET=y
CONFIG_ETH_W5500=y
alone link the drivers to the project.

so in the case that the driver isnt a zephyr component does that make it alot harder to add in ? is there a template/ tutorial / page on the matter ?

RE: Adding in drivers into zephyr

Håkon Alseth — Mon, 18 Oct 2021 10:39:32 GMT

Hi,

This driver is a zephyr component, but I'll try to help you along the way.

You need to first add the dependencies of the device itself, which is the transport layer (SPI) and the net stack in zephyr:

CONFIG_SPI=y
CONFIG_NETWORKING=y
CONFIG_NET_L2_ETHERNET=y
CONFIG_ETH_W5500=y

And you need to define the device in device tree as well. This can be done by creating the my-application/boards folder, and $(BOARD).overlay (for example: boards/nrf5340dk_nrf5340_cpuapp.overlay), which should hold the peripheral and device specific declaration:

&spi3 {
        sck-pin = <47>;
        miso-pin = <46>;
        mosi-pin = <45>;
        cs-gpios = <&gpio0 21 GPIO_ACTIVE_LOW>;
        status = "okay";
        w5500: w5500@0 {
                compatible = "wiznet,w5500";
                label = "w5500";
                reg = <0>;
                spi-max-frequency = <1000000>;
                int-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>;
// optional:             reset-gpios = <&gpio0 21 GPIO_ACTIVE_LOW>;
        };
};

Note that the above is provided as an example, please change the GPIOs to match your wanted pins.

Kind regards,

Håkon

RE: Adding in drivers into zephyr

tedhavelka — Sun, 17 Oct 2021 15:25:13 GMT

Good morning @lolcatsnin,

Fellow Devzone developer Ted here. I will be watching replies to your posted question as it's closely related to a Zephyr driver integration problem I was about to post here myself. I am sorry I do not have a ready solution to share with you right now.

On my side I am trying to integrate the driver for STMicro's IIS2DH accelerometer into a small Zephyr app of my own, which presently targets Sparkfun's Thing Plus nRF9160 development board. Nordic Semi's sdk-nrf includes a sample app for the closely related LIS2DH, and there are drivers for both these parts in sdk-nrf v1.6.1 modules project. I think these may be considered "out-of-tree" drivers because they're located in a 'modules' directory that is cloned along side Nordic's fork of the Zephyr project. They're not located under the 'zephyr' directory at the top level of the SDK.

In general I believe you are on the right track. To enable `cmake` to find IIS2DH header file I needed to add a line to my project's CMakeLists.txt file that's of the form of your line above, `zephyr_include_directories(${ZEPHYR_BASE}/subsys/net/l2)`.

In your work I am unsure about directly copying contents of a Kconfig file into prj.conf. These two file types seem to have somewhat different syntax. Kconfig files express which kernel options and option inter-dependencies are available and present. Prj.conf enables them with the 'symbol=value' syntax. But these two files are closely related in a given Zephyr based project.

- Ted