Using ws2812 with nrf52840

[MOHAMED AHMED ALI MAHMOUD ELSABAGH]

I am trying to control ws2812 LED (1 LED) with NRF52840 using nrf connect SDK, I was able to control it with no problem when I set building optimization to debug optimization, but when I set optimization to size or speed optimization I get a hard fault message when function 

led_strip_update_rgb(strip, pixels, STRIP_NUM_PIXELS); is called

[00:00:04.002,014] <err> os: ***** USAGE FAULT *****
[00:00:04.002,349] <err> os:   Attempt to execute undefined instruction
[00:00:04.002,777] <err> os: r0/a1:  0x01000002  r1/a2:  0x00000000  r2/a3:  0x0000001f
[00:00:04.003,295] <err> os: r3/a4:  0x07ffffff r12/ip:  0x00000100 r14/lr:  0x003d0900
[00:00:04.003,814] <err> os:  xpsr:  0x21000000
[00:00:04.004,*** Booting My Application v3.5.0-c1ab2163a399 ***
*** Using nRF Connect SDK v2.8.0-a2386bfc8401 ***
*** Using Zephyr OS v3.7.99-0bc3393fb112 ***

I am using nrf connect sdk 2.8.0

BR

M.ElSabagh

[Kazi Afroza Sultana]

Hello,

I have checked your overlay file. It is missing include header file. 

spi3_default_alt and spi3_sleep_alt should be inside pinctrl node.

Can you try this following overlay instead?

#include <zephyr/dt-bindings/led/led.h>
#include "../nrf52-bindings.h"

&pinctrl {
    spi3_default_alt: spi3_default_alt {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 0, 10)>,
                   <NRF_PSEL(SPIM_MOSI, 0, 9)>;
        };
    };

    spi3_sleep_alt: spi3_sleep_alt {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 0, 10)>,
                   <NRF_PSEL(SPIM_MOSI, 0, 9)>;
            low-power-enable;
        };
    };
};

&spi3 {
    compatible = "nordic,nrf-spim";
    status = "okay";
    pinctrl-0 = <&spi3_default_alt>;
    pinctrl-1 = <&spi3_sleep_alt>;
    pinctrl-names = "default", "sleep";

    led_strip: ws2812@0 {
        compatible = "worldsemi,ws2812-spi";

        /* SPI */
        reg = <0>; /* ignored, but necessary for SPI bindings */
        spi-max-frequency = <SPI_FREQ>;

        /* WS2812 */
        chain-length = <1>; /* arbitrary; change at will */
        color-mapping = <LED_COLOR_ID_GREEN
                 LED_COLOR_ID_RED
                 LED_COLOR_ID_BLUE>;
        spi-one-frame = <ONE_FRAME>;
        spi-zero-frame = <ZERO_FRAME>;
    };
};

/ {
    aliases {
        led-strip = &led_strip;
    };
};

[MOHAMED AHMED ALI MAHMOUD ELSABAGH]

I actually have those on top of my file 

#include <nordic/nrf52840_qiaa.dtsi>
#include <zephyr/dt-bindings/led/led.h>

#include "../../../nrf52-bindings.h"

 also as I mentioned everything is working fine when the build is set to debug optimization but I get those errors only with size or speed optimization build

[MOHAMED AHMED ALI MAHMOUD ELSABAGH]

Kazi Afroza Sultana Adding SPIM_SCK pin on the overlay file actually solved the problem, it was missing before coz it wasn't used or needed, I am not sure why it's working on debug optimization and not on size/speed optimization though