Need clear understanding about CAF example project

RE: Need clear understanding about CAF example project

Edvin — Mon, 28 Oct 2024 08:48:52 GMT

Did you do any changes to the leds.c file?

Did you define CONFIG_CAF_LEDS_GPIO=y in your prj.conf?

Best regards,

Edvin

RE: Need clear understanding about CAF example project

akay47 — Thu, 24 Oct 2024 15:02:29 GMT

Thanks, i got some idea and i was able to understand how this example works with CAF LED as PWM. But now there is an option to change LED PWM to LED GPIO. after doing that i am not sure what all changes overlay file would need for this LED GPIO CAF. Here is my sample but it does not work at all:

/ {

gpio_leds {

compatible = "gpio-leds";

status = "okay";

led4: led_4 {

gpios = <&gpio1 2 GPIO_ACTIVE_LOW>;

label = "LED 4";

};

led5: led_5 {

gpios = <&gpio1 3 GPIO_ACTIVE_LOW>;

label = "LED 5";

};

led6: led_6 {

gpios = <&gpio1 4 GPIO_ACTIVE_LOW>;

label = "LED 6";

};

&gpio0 {

status = "okay";

};

&gpio1 {

status = "okay";

};

Then i debug the code and in leds.c file led[] has no instance of gpios that i setup. Any idea on this? thanks

RE: Need clear understanding about CAF example project

Edvin — Mon, 21 Oct 2024 13:23:06 GMT

Hello,

I think you should study the application sample in:

NCS\nrf\applications\nrf_desktop

And look there how it is used. But again, I am not convinced that this is the easiest way to control some RGB leds.

If you look at how the led_state_def.h is being used in led_state.c (ncs\nrf\samples\caf\src\modules\led_state.c), these gpios are set in the file:

nrf\samples\caf\boards\<board_name>.overlay, and the pwmleds1, pwmleds2 and pwmleds3, which I believe is what you are asking.

Best regards,

Edvin

RE: Need clear understanding about CAF example project

akay47 — Thu, 17 Oct 2024 17:33:59 GMT

Its needed because we want to use CAF led module for our product development, that's why i am trying to understand this. I figured out many things and i still have a question do you know in CAF example this enum led_id seems like is getting mapped to pwm pins given in overlay file. but where exactly or how this mapping is happening? Thanks.

RE: Need clear understanding about CAF example project

Edvin — Thu, 17 Oct 2024 13:49:59 GMT

I wouldn't worry too much about this file.

This (the entire caf module) was written because it was intended to be used multiple places, but in reality, it is only used in our nrf_desktop example application, which is intended to run on some hardware that we have (not a DK), and this has some RGB leds.

To be honest, I have not seen that this API existed before now.

Best regards,

Edvin