213 lines
6.7 KiB
C
213 lines
6.7 KiB
C
/****************************************************************************
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* include/nuttx/leds/ws2812.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_LEDS_WS2812_H
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#define __INCLUDE_NUTTX_LEDS_WS2812_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/fs/ioctl.h>
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#include <nuttx/fs/fs.h>
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#ifdef CONFIG_WS2812_NON_SPI_DRIVER
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#include <nuttx/mutex.h>
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#else /* CONFIG_WS2812_NON_SPI_DRIVER */
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#include <nuttx/spi/spi.h>
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#endif /* CONFIG_WS2812_NON_SPI_DRIVER */
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#ifdef CONFIG_WS2812
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/****************************************************************************
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* ######## ATTENTION #######
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* This file contains code that supports two separate ws2812 upper-half
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* models:
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*
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* If CONFIG_WS2812_NON_SPI_DRIVER is NOT defined the older upper-half
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* code that uses SPI to send the serial data will be built.
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*
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* If WS2812_NEW_MODEL_DRIVER is defined the upper-half code that does
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* not relay on SPI will be built.
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****************************************************************************/
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Although the LED might be RGB-only, the LED data is packed in a 32-bit
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* long variable and, then, this is the default size of a LED pixel.
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*/
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#define WS2812_RW_PIXEL_SIZE 4
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifdef CONFIG_WS2812_NON_SPI_DRIVER
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struct ws2812_dev_s
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{
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/* --------------------------------------------------------
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* Each board that implements ws2812 must initialize the
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* following fields before calling ws2812_register.
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*
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* The close and read pointer may be initialized to NULL
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* and the upper-half will do the right thing.
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*/
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FAR int (*open)(FAR struct file *filep);
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FAR int (*close)(FAR struct file *filep);
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FAR ssize_t (*write)(FAR struct file *filep,
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FAR const char *data,
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size_t len);
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FAR ssize_t (*read)(FAR struct file *filep,
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FAR char *data,
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size_t len);
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FAR void *private; /* Private data for opened device */
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uint32_t clock;
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mutex_t lock;
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int port;
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uint16_t nleds;
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bool has_white;
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};
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef CONFIG_WS2812_NON_SPI_DRIVER
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/****************************************************************************
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* Name: ws2812_register
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*
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* Description:
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* Initialize a ws2812 device as a LEDs interface.
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*
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* Input Parameters:
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* dev_path - The full path to the driver to register. E.g., "/dev/leds0"
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* dev_data - The partially initialize ws2812 structure.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int ws2812_register(FAR const char *dev_path,
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FAR struct ws2812_dev_s *dev_data);
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#else /* CONFIG_WS2812_NON_SPI_DRIVER */
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/****************************************************************************
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* Name: ws2812_leds_register
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*
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* Description:
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* Initialize the WS2812 device as a LEDS interface.
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*
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* Input Parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/leds0"
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* spi - An instance of the SPI interface to use to communicate
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* with the WS2812.
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* nleds - Number of addressable LEDs
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int ws2812_leds_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
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uint16_t nleds);
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#endif /* CONFIG_WS2812_NON_SPI_DRIVER */
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/****************************************************************************
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* Name: ws2812_hsv_to_rgb
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*
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* Description:
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* Convert a set of hue, saturation and value numbers to an RGB pixel.
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*
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* Representative "hue" values:
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* Red 0
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* Yellow 42
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* Green 86
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* Cyan 128
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* Blue 170
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* Magenta 212
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*
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* "Saturation" values run from 0 (gray) to 255 (pure color)
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*
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* "Value" values run from 0 (black) to 255 (full brightness)
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*
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* Input Parameters:
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* hue in range (0-255) (red -> 0, green -> 85, blue -> 170)
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* saturation in range (0-255)
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* value in range (0-255)
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*
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* Returned Value:
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* A 32-bit pixel in 0x00RRGGBB format.
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*
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****************************************************************************/
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uint32_t ws2812_hsv_to_rgb(uint8_t hue,
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uint8_t saturation,
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uint8_t value);
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/****************************************************************************
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* Name: ws2812_gamma_correct
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*
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* Description:
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* Applies a gamma correction to the supplied pixel.
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*
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* This applies the function y = 255 * (x / 255)^2.6 to each color
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* component of the pixel.
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*
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* Input Parameters:
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* a 32-bit pixel with 8-bit color components.
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*
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* Returned Value:
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* A 32-bit gamma corrected pixel.
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*
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****************************************************************************/
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uint32_t ws2812_gamma_correct(uint32_t pixel);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_WS2812 */
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#endif /* __INCLUDE_NUTTX_LEDS_WS2812_H */
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