Controlling WS2812 LEDs with NCS on nRF52832DK with gpios (not SPI)

RE: Controlling WS2812 LEDs with NCS on nRF52832DK with gpios (not SPI)

Kazi Afroza Sultana — Wed, 15 Jun 2022 13:14:48 GMT

Hello,

That option is only supported on nRF51 https://github.com/zephyrproject-rtos/zephyr/blob/main/drivers/led_strip/Kconfig.ws2812#L29. ''The GPIO driver does bit-banging with inline assembly and is not available on all SoC''

You are using arduino_spi_arduino_spi: &spi2, so just need to configure the SPI pin you want to use in the overlay.

For example.

&arduino_spi {
compatible = "nordic,nrf-spim";
status = "okay";
sck-pin = <25>;
mosi-pin = <28>;
miso-pin = <24>;
cs-gpios = <&arduino_header 16 GPIO_ACTIVE_LOW>; /* D10 */
led_strip: ws2812@0 {
compatible = "worldsemi,ws2812-spi";
label = "WS2812";

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

/* WS2812 */
chain-length = <16>; /* arbitrary; change at will */
spi-one-frame = <ONE_FRAME>;
spi-zero-frame = <ZERO_FRAME>;
};
};

The SPI instances (for example SP1, SPI0) you dnt need to use can select them as disable.

Thanks.

Best Regards,

Kazi Afroza Sultana

RE: Controlling WS2812 LEDs with NCS on nRF52832DK with gpios (not SPI)

ZackBoi — Wed, 08 Jun 2022 13:33:30 GMT

No. Actually I was wondering if I am able to control the LEDs with a pin that is not a SPI MOSI pin. As you pointed out in the overlay file, one of these MOSI pins is P0.23. Looking at the nRF52DK_832 .dts file below, it looks like P0.26 and P0.30 are also MOSI pins. Is there any way to control WS2812 LED without these any of these MOSI pins on the nRF52832 DK? Specifically maybe pin P0.28? Thanks.

&spi0 {
	compatible = "nordic,nrf-spi";
	/* Cannot be used together with i2c0. */
	/* status = "okay"; */
	sck-pin = <27>;
	mosi-pin = <26>;
	miso-pin = <28>;
};

&spi1 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	sck-pin = <31>;
	mosi-pin = <30>;
	miso-pin = <29>;
};

arduino_spi: &spi2 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	sck-pin = <25>;
	mosi-pin = <23>;
	miso-pin = <24>;
	cs-gpios = <&arduino_header 16 GPIO_ACTIVE_LOW>; /* D10 */
};

RE: Controlling WS2812 LEDs with NCS on nRF52832DK with gpios (not SPI)

Kazi Afroza Sultana — Wed, 08 Jun 2022 09:18:54 GMT

Hello,

Have you set correct pin number in accordance to your board for MOSI pin?

We have overlay file for led_ws2812 zephyr/nrf52dk_nrf52832.overlay at v2.6.1-rc2 · zephyrproject-rtos/zephyr · GitHub you can look at.

Thanks.

Best Regards,

Kazi Afroza Sultana

RE: Controlling WS2812 LEDs with NCS on nRF52832DK with gpios (not SPI)

ZackBoi — Sat, 04 Jun 2022 15:31:17 GMT

I found this in the documentation here. Not sure exactly how to implement this.