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1ed1906023
Added driver for the WS2812/SK6812 RGB LEDs often sold as NeoPixels, which due to their integrated RGB controller can be chained to arbitrary length and controlled with a single GPIO.
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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* Copyright 2019 Marian Buschsieweke
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_ws281x
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*
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* @{
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*
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* @file
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* @brief Driver for the WS2812 or the SK6812 RGB LEDs sold as NeoPixel
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*
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* @author Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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*
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* @}
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*/
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#include <assert.h>
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#include <errno.h>
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#include <stdint.h>
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#include <string.h>
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#include "ws281x.h"
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#include "ws281x_constants.h"
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#include "ws281x_params.h"
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#include "periph/gpio.h"
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/* Default buffer used in ws281x_params.h. Will be optimized out if unused */
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uint8_t ws281x_buf[WS281X_PARAM_NUMOF * WS281X_BYTES_PER_DEVICE];
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/* Some backend will need a custom init function. Declaring this as weak symbol
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* allows them to provide their own. */
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int __attribute__((weak)) ws281x_init(ws281x_t *dev,
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const ws281x_params_t *params)
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{
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if (!dev || !params || !params->buf) {
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return -EINVAL;
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}
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memset(dev, 0, sizeof(ws281x_t));
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dev->params = *params;
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if (gpio_init(dev->params.pin, GPIO_OUT)) {
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return -EIO;
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}
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return 0;
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}
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void ws281x_set_buffer(void *_dest, uint16_t n, color_rgb_t c)
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{
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uint8_t *dest = _dest;
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dest[WS281X_BYTES_PER_DEVICE * n + WS281X_OFFSET_R] = c.r;
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dest[WS281X_BYTES_PER_DEVICE * n + WS281X_OFFSET_G] = c.g;
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dest[WS281X_BYTES_PER_DEVICE * n + WS281X_OFFSET_B] = c.b;
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}
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