Using ws2812 with nrf52840

Question

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] os: ***** USAGE FAULT ***** [00:00:04.002,349] os: Attempt to execute undefined instruction [00:00:04.002,777] os: r0/a1: 0x01000002 r1/a2: 0x00000000 r2/a3: 0x0000001f [00:00:04.003,295] os: r3/a4: 0x07ffffff r12/ip: 0x00000100 r14/lr: 0x003d0900 [00:00:04.003,814] 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 · Accepted Answer

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 #include "../nrf52-bindings.h" &pinctrl { spi3_default_alt: spi3_default_alt { group1 { psels = , ; }; }; spi3_sleep_alt: spi3_sleep_alt { group1 { psels = , ; 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 = ; /* WS2812 */ chain-length = <1>; /* arbitrary; change at will */ color-mapping = ; spi-one-frame = ; spi-zero-frame = ; }; }; / { aliases { led-strip = &led_strip; }; };

Using ws2812 with nrf52840

Top Replies