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.
