I'm a software guy with a bit of embedded dev experience and trying to get the LED_strip sample to work in v2.8. I got the code working in 2.61, and discovered that a 2.8 sample was available. I tried to put it together, but was getting an error on compile, and realized that I had no overlay selected for the LED strip usage. I tried to find the correct overlay for the nrf52840dk, but it doesn't show up in search:
Is there another overlay that I can adapt to this board?
I tried bringing the overlay I used in the 2.61 sample, but that doesn't seem to match naming conventions, and I also tried to adapt an overlay but it still didn't compile, so I'm missing something.
I have the LED strip connected to p0.29, and would like to indicate that in the overlay configuration.
Here is the overlay I'm using in 2.61:
/*
* Copyright (c) 2019, Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/dt-bindings/led/led.h>
#include "../nrf52-bindings.h"
&spi1 { /* MOSI on D11 / P0.23 */
compatible = "nordic,nrf-spim";
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 = <6>; /* 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>;
};
};
&spi1_default {
group1 {
psels = <NRF_PSEL(SPIM_MOSI, 0, 29)>, // pin p0.29 gets the data signal
<NRF_PSEL(SPIM_SCK, 0, 30)>; // clock is not used for WS2812
//<NRF_PSEL(SPIM_MISO, 0, 31)>;
};
};
&spi1_sleep {
group1 {
psels = <NRF_PSEL(SPIM_MOSI, 0, 29)>,
<NRF_PSEL(SPIM_SCK, 0, 30)>;
//<NRF_PSEL(SPIM_MISO, 0, 31)>;
low-power-enable;
};
};
/ {
aliases {
led-strip = &led_strip;
};
};
Here is the config file:
CONFIG_SPI=y # This driver only uses spi_write() with the SPIM instance it allocates, # so PAN 58 doesn't matter, because the RX length is always 0. CONFIG_SOC_NRF52832_ALLOW_SPIM_DESPITE_PAN_58=y
Thanks for any input!
