Hi,
I'm using WS2812B as a status LED. I don't have any free SPI ports. So my only option is to use I2S. It is displaying just white. I cannot change colors or turn it off. It displays a shade of the color I want with a a lot of white. It's difficult to view the correct color. I have used up all 4 possible serial peripherals so I2S is my only choice. Please let me know if this can be fixed or if there is any other way to control this LED. I have verified the LED with the SPI driver it is working properly. I'm using v2.7.0 toolchain & v2.6.1 SDK.
Here is the overlay and program.
#include <zephyr/dt-bindings/led/led.h> &pinctrl { i2s0_default_alt: i2s0_default_alt { group1 { psels = <NRF_PSEL(I2S_SCK_M, 0, 20)>, <NRF_PSEL(I2S_LRCK_M, 0, 19)>, <NRF_PSEL(I2S_SDOUT, 0, 0)>, <NRF_PSEL(I2S_SDIN, 0, 21)>; }; }; }; i2s_led: &i2s0 { status = "okay"; pinctrl-0 = <&i2s0_default_alt>; pinctrl-names = "default"; }; / { led_strip: ws2812 { compatible = "worldsemi,ws2812-i2s"; i2s-dev = < &i2s_led >; chain-length = <1>; /* arbitrary; change at will */ color-mapping = <LED_COLOR_ID_GREEN LED_COLOR_ID_RED LED_COLOR_ID_BLUE>; out-active-low; reset-delay = <120>; }; aliases { led-strip = &led_strip; }; };
/* * Copyright (c) 2017 Linaro Limited * Copyright (c) 2018 Intel Corporation * * SPDX-License-Identifier: Apache-2.0 */ #include <errno.h> #include <string.h> #define LOG_LEVEL 4 #include <zephyr/logging/log.h> LOG_MODULE_REGISTER(main); #include <zephyr/kernel.h> #include <zephyr/drivers/led_strip.h> #include <zephyr/device.h> #include <zephyr/drivers/spi.h> #include <zephyr/sys/util.h> #define STRIP_NODE DT_ALIAS(led_strip) #define STRIP_NUM_PIXELS DT_PROP(DT_ALIAS(led_strip), chain_length) #define DELAY_TIME K_MSEC(500) #define RGB(_r, _g, _b) {.r = (_r), .g = (_g), .b = (_b)} static const struct led_rgb colors[] = { RGB(0x0f, 0x00, 0x00), /* red */ RGB(0x00, 0x0f, 0x00), /* green */ RGB(0x00, 0x00, 0x0f), /* blue */ }; struct led_rgb pixels[STRIP_NUM_PIXELS]; static const struct device *const strip = DEVICE_DT_GET(STRIP_NODE); int main(void) { size_t cursor = 0, color = 0; int rc; if (device_is_ready(strip)) { LOG_INF("Found LED strip device %s", strip->name); } else { LOG_ERR("LED strip device %s is not ready", strip->name); return 0; } LOG_INF("Displaying pattern on strip"); while (1) { memset(&pixels, 0x00, sizeof(pixels)); memcpy(&pixels[cursor], &colors[color], sizeof(struct led_rgb)); rc = led_strip_update_rgb(strip, pixels, STRIP_NUM_PIXELS); if (rc) { LOG_ERR("couldn't update strip: %d", rc); } cursor++; if (cursor >= STRIP_NUM_PIXELS) { cursor = 0; color++; if (color == ARRAY_SIZE(colors)) { color = 0; } } k_sleep(DELAY_TIME); } return 0; }
Thanks.