330 lines
12 KiB
C
330 lines
12 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* Copyright (c) 2018, George Oikonomou - http://www.spd.gr
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup dev
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* @{
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \defgroup leds LED Hardware Abstraction Layer
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*
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* The LED HAL provides a set of functions that can manipulate LEDS.
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*
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* Currently, the LED HAL supports two APIs:
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*
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* - The new, platform-independent API (recommended for all new platforms).
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* - The legacy API (supported until all existing platforms have been ported
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* to support the new API).
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*
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* The two APIs use very similar semantics and have an overlapping set of
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* function calls. This is done so that platform-independent examples can
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* work on all platforms, irrespective of which API each platform supports.
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*
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* The legacy API can be enabled by the platform code by defining
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* LEDS_CONF_LEGACY_API 1.
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*
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* Once all platforms supported in contiki-ng/contiki-ng have been ported to
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* the new API, the legacy API will be deleted without warning. For this
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* reason, it is strongly recommended to use the new API for new platforms and
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* for platforms hosted in external repositories.
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*
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* The new API provides a set of common LED manipulation functions that can be
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* used in a platform-independent fashion. Functions exist to manipulate one
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* LED at a time (\c leds_single_XYZ), as well as to manipulate multiple LEDs
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* at a time (\c leds_XYZ).
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*
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* The assumption is that each LED is connected to a GPIO pin using either
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* positive or negative logic.
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*
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* LEDs on a device are numbered incrementally, starting from 0 and counting
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* upwards. Thus, if a device has 3 LEDs they will be numbered 0, 1 and 2.
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* Convenience macros (LEDS_LED_n) are provided to refer to LEDs. These macros
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* can be used as arguments to functions that manipulate a single LED, such
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* as leds_single_on() but \e not leds_on().
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*
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* The legacy scheme that uses colours to refer to LEDs is maintained, without
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* semantic changes, but with minor changes in logic:
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*
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* - Firstly, we now define 5 LED colours: Red, Green, Blue, Yellow, Orange.
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* These are sufficient to cover all currently-supported platforms.
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* - Secondly, unless a platform specifies that a LED of a specific colour
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* exists, the HAL will assume that it does not.
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* - Trying to manipulate a non-existent LED will not cause build errors, but
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* will not cause any changes to LED state either.
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* - We no longer map non-existing LED colours to existing ones.
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*
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* Note that, in order to avoid changes to LED colour semantics between the
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* two APIs, references to LED by colour are bitwise OR masks and should
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* therefore only be used as argument to functions that manipulate multiple
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* LEDS (e.g. leds_off() and \e not leds_single_off()).
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*
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* In terms of porting for new platforms, developers simply have to:
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*
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* - Define variables of type leds_t to represent their platform's LEDs
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* - Specify the number of LEDs on their device by defining LEDS_CONF_COUNT
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* - Map red colours to numbers (e.g. \#define LEDS_CONF_RED 1)
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*
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* \file
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* Header file for the LED HAL
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* @{
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*/
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/*---------------------------------------------------------------------------*/
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#ifndef LEDS_H_
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#define LEDS_H_
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "dev/gpio-hal.h"
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#include <stdint.h>
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#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
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#if LEDS_CONF_LEGACY_API
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/**
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* \brief Define to 1 to enabled the legacy LED API.
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*/
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#define LEDS_LEGACY_API LEDS_CONF_LEGACY_API
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#else
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#define LEDS_LEGACY_API 0
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#endif
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/*---------------------------------------------------------------------------*/
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/**
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* \brief A default LED colour for non-existing LEDs
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*/
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#define LEDS_COLOUR_NONE 0x00
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/*---------------------------------------------------------------------------*/
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/* LED colour to number mappings. Applicable to both APIs */
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#ifdef LEDS_CONF_RED
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#define LEDS_RED LEDS_CONF_RED
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#else
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#define LEDS_RED LEDS_COLOUR_NONE
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#endif
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#ifdef LEDS_CONF_GREEN
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#define LEDS_GREEN LEDS_CONF_GREEN
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#else
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#define LEDS_GREEN LEDS_COLOUR_NONE
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#endif
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#ifdef LEDS_CONF_BLUE
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#define LEDS_BLUE LEDS_CONF_BLUE
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#else
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#define LEDS_BLUE LEDS_COLOUR_NONE
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#endif
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#ifdef LEDS_CONF_YELLOW
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#define LEDS_YELLOW LEDS_CONF_YELLOW
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#else
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#define LEDS_YELLOW LEDS_COLOUR_NONE
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#endif
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#ifdef LEDS_CONF_ORANGE
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#define LEDS_ORANGE LEDS_CONF_ORANGE
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#else
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#define LEDS_ORANGE LEDS_COLOUR_NONE
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#endif
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/*---------------------------------------------------------------------------*/
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/**
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* \brief The LED number
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*/
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typedef uint8_t leds_num_t;
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/**
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* \brief An OR mask datatype to represents multiple LEDs.
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*/
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typedef uint8_t leds_mask_t;
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/*---------------------------------------------------------------------------*/
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#if LEDS_LEGACY_API
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/*---------------------------------------------------------------------------*/
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#ifdef LEDS_CONF_ALL
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#define LEDS_ALL LEDS_CONF_ALL
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#else
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#define LEDS_ALL 7
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#endif
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/*---------------------------------------------------------------------------*/
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void leds_blink(void);
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/* Legacy LED API arch-specific functions */
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void leds_arch_init(void);
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leds_mask_t leds_arch_get(void);
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void leds_arch_set(leds_mask_t leds);
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/*---------------------------------------------------------------------------*/
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#else /* LEDS_LEGACY_API */
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/*---------------------------------------------------------------------------*/
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#ifdef LEDS_CONF_COUNT
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#define LEDS_COUNT LEDS_CONF_COUNT
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#else
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/**
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* \brief The number of LEDs present on a device
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*/
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#define LEDS_COUNT 0
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#endif
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/*---------------------------------------------------------------------------*/
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/**
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* \brief The OR mask representation of all device LEDs
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*/
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#define LEDS_ALL ((1 << LEDS_COUNT) - 1)
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/*---------------------------------------------------------------------------*/
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#endif /* LEDS_LEGACY_API */
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/*---------------------------------------------------------------------------*/
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#define LEDS_LED1 0x00 /**< Convenience macro to refer to the 1st LED (LED 1) */
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#define LEDS_LED2 0x01 /**< Convenience macro to refer to the 2nd LED (LED 2) */
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#define LEDS_LED3 0x02 /**< Convenience macro to refer to the 3rd LED (LED 3) */
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#define LEDS_LED4 0x03 /**< Convenience macro to refer to the 4th LED (LED 4) */
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#define LEDS_LED5 0x04 /**< Convenience macro to refer to the 5th LED (LED 5) */
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/*---------------------------------------------------------------------------*/
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/**
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* \brief A LED logical representation
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*
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* \e pin corresponds to the GPIO pin a LED is driven by, using GPIO HAL pin
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* representation.
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*
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* \e negative_logic should be set to false if the LED is active low.
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*/
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typedef struct leds_s {
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gpio_hal_pin_t pin;
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bool negative_logic;
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} leds_t;
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Convert a LED number to a mask representation
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* \param l The pin number (normally a variable of type leds_num_t)
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* \return An OR mask of type leds_mask_t
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*/
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#define LEDS_NUM_TO_MASK(l) (1 << (l))
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Initialise the LED HAL
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*
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* This function will set corresponding LED GPIO pins to output and will also
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* set the initial state of all LEDs to off.
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*/
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void leds_init(void);
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/**
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* \brief Turn a single LED on
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* \param led The led
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*
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* The \e led argument should be the LED's number, in other words one of the
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* LED_Ln macros.
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*
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* This function will not change the state of other LEDs.
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*/
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void leds_single_on(leds_num_t led);
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/**
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* \brief Turn a single LED off
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* \param led The led
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*
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* The \e led argument should be the LED's number, in other words one of the
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* LED_Ln macros.
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*
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* This function will not change the state of other LEDs.
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*/
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void leds_single_off(leds_num_t led);
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/**
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* \brief Toggle a single LED
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* \param led The led
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*
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* The \e led argument should be the LED's number, in other words one of the
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* LED_Ln macros.
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*
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* This function will not change the state of other LEDs.
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*/
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void leds_single_toggle(leds_num_t led);
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/**
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* \brief Turn on multiple LEDs
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* \param leds The leds to be turned on as an OR mask
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*
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* The \e led argument should be a bitwise mask of the LEDs to be changed.
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* For example, to turn on LEDs 1 and 3, you should pass
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* LED_NUM_TO_MASK(LED_L1) | LED_NUM_TO_MASK(LED_L3) = 1 | 4 = 5
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*
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* This function will not change the state of other LEDs.
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*/
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void leds_on(leds_mask_t leds);
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/**
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* \brief Turn off multiple LEDs
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* \param leds The leds to be turned off as an OR mask
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*
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* The \e led argument should be a bitwise mask of the LEDs to be changed.
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* For example, to turn on LEDs 1 and 3, you should pass
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* LED_NUM_TO_MASK(LED_L1) | LED_NUM_TO_MASK(LED_L3) = 1 | 4 = 5
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*
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* This function will not change the state of other LEDs.
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*/
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void leds_off(leds_mask_t leds);
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/**
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* \brief Toggle multiple LEDs
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* \param leds The leds to be toggled as an OR mask
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*
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* The \e led argument should be a bitwise mask of the LEDs to be changed.
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* For example, to turn on LEDs 1 and 3, you should pass
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* LED_NUM_TO_MASK(LED_L1) | LED_NUM_TO_MASK(LED_L3) = 1 | 4 = 5
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*
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* This function will not change the state of other LEDs.
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*/
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void leds_toggle(leds_mask_t leds);
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/**
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* \brief Set all LEDs to a specific state
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* \param leds The state of all LEDs afer this function returns
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*
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* The \e led argument should be a bitwise mask of the LEDs to be changed.
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* For example, to turn on LEDs 1 and 3, you should pass
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* LED_NUM_TO_MASK(LED_L1) | LED_NUM_TO_MASK(LED_L3) = 1 | 4 = 5
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*
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* This function will change the state of all LEDs. LEDs not set in the \e leds
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* mask will be turned off.
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*/
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void leds_set(leds_mask_t leds);
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/**
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* \brief Get the status of LEDs
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* \return A bitwise mask indicating whether each individual LED is on or off
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*
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* The return value is a bitwise mask. If a bit is set then the corresponding
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* LED is on.
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*/
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leds_mask_t leds_get(void);
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/*---------------------------------------------------------------------------*/
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#endif /* LEDS_H_ */
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/*---------------------------------------------------------------------------*/
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/**
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* @}
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* @}
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*/
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