103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/**
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* @file ws2812.h
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* @author Austin Glaser <austin.glaser@gmail.com>
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* @brief Interface to WS2812 LED driver
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*
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* Copyright (C) 2016 Austin Glaser
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE file for details.
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*
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* @todo Put in names and descriptions of variables which need to be defined to use this file
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*/
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#ifndef WS2812_H_
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#define WS2812_H_
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/**
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* @defgroup WS2812 WS2812 Driver
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* @{
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*
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* @brief DMA-based WS2812 LED driver
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*
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* A driver for WS2812 LEDs
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*/
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/* --- PUBLIC DEPENDENCIES -------------------------------------------------- */
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// Standard
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#include <stdint.h>
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#include "color.h"
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/* --- PUBLIC MACROS -------------------------------------------------------- */
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/**
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* @brief Concatenates two symbols s1 and s2 exactly, without expanding either
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*
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* @param[in] s1: The first symbol to concatenate
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* @param[in] s2: The second symbol to concatenate
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*
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* @return A single symbol containing s1 and s2 concatenated without expansion
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*/
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#define CONCAT_SYMBOLS(s1, s2) s1##s2
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/**
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* @brief Concatenate the symbols s1 and s2, expanding both of them
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*
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* This is important because simply applying s1##s2 doesn't expand them if they're
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* preprocessor tokens themselves
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*
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* @param[in] s1: The first symbol to concatenate
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* @param[in] s2: The second symbol to concatenate
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*
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* @return A single symbol containing s1 expanded followed by s2 expanded
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*/
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#define CONCAT_EXPANDED_SYMBOLS(s1, s2) CONCAT_SYMBOLS(s1, s2)
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/* --- PUBLIC CONSTANTS ----------------------------------------------------- */
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/**
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* @brief Return codes from ws2812 interface functions
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*/
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typedef enum {
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WS2812_SUCCESS = 0x00, /**< Operation completeed successfully */
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WS2812_LED_INVALID, /**< Attempted to index an invalid LED (@ref WS2812_N_LEDS) */
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MAX_WS2812_ERR, /**< Total number of possible error codes */
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WS2812_ERR_INVALID /**< Invalid error value */
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} ws2812_err_t;
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/* --- PUBLIC FUNCTIONS ----------------------------------------------------- */
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/**
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* @brief Initialize the driver
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*
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* After this function is called, all necessary background tasks will be started.
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* The frame is initially dark.
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*/
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void ws2812_init(void);
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/**
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* @brief Write the value of a single LED in the chain
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*
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* The color value is written to a frame buffer, and will not
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* be updated until the next frame is written. Frames are written
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* at the maximum possible speed -- the longest latency between a
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* call to this function and the value being displayed is
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* 1.25uS*(24*@ref WS2812_LED_N + 50)
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*
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* @param[in] led_number: The index of the LED to be written. Must be strictly less than
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* @ref WS2812_N_LEDS
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* @param[in] r: The red level of the LED
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* @param[in] g: The green level of the LED
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* @param[in] b: The blue level of the LED
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*
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* @retval WS2812_SUCCESS: The write was successful
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* @retval WS2812_LED_INVALID: The write was to an invalid LED index
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*/
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ws2812_err_t ws2812_write_led(uint32_t led_number, uint8_t r, uint8_t g, uint8_t b);
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void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds);
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/** @} defgroup WS2812 */
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#endif // ifndef WS2812_H_
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