Commit 565305d6 authored by George Oikonomou's avatar George Oikonomou
Browse files

Introduce new GPIO Hardware Abstraction Layer

parent 8f0d0edc
/*
* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup gpio-hal
* @{
*
* \file
* Implementation of the platform-independent aspects of the GPIO HAL
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "dev/gpio-hal.h"
#include "lib/list.h"
#include <stdint.h>
#include <string.h>
/*---------------------------------------------------------------------------*/
LIST(handlers);
/*---------------------------------------------------------------------------*/
void
gpio_hal_register_handler(gpio_hal_event_handler_t *handler)
{
list_add(handlers, handler);
}
/*---------------------------------------------------------------------------*/
void
gpio_hal_event_handler(gpio_hal_pin_mask_t pins)
{
gpio_hal_event_handler_t *this;
for(this = list_head(handlers); this != NULL; this = this->next) {
if(pins & this->pin_mask) {
if(this->handler != NULL) {
this->handler(pins & this->pin_mask);
}
}
}
}
/*---------------------------------------------------------------------------*/
void
gpio_hal_init()
{
list_init(handlers);
}
/*---------------------------------------------------------------------------*/
#if GPIO_HAL_ARCH_SW_TOGGLE
/*---------------------------------------------------------------------------*/
void
gpio_hal_arch_toggle_pin(gpio_hal_pin_t pin)
{
if(pin >= GPIO_HAL_PIN_COUNT) {
return;
}
gpio_hal_arch_write_pin(pin, gpio_hal_arch_read_pin(pin) ^ 1);
}
/*---------------------------------------------------------------------------*/
void
gpio_hal_arch_toggle_pins(gpio_hal_pin_mask_t pins)
{
gpio_hal_arch_write_pins(pins, ~gpio_hal_arch_read_pins(pins));
}
/*---------------------------------------------------------------------------*/
#endif /* GPIO_HAL_ARCH_SW_TOGGLE */
/*---------------------------------------------------------------------------*/
/**
* @}
*/
/*
* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup dev
* @{
*
* \defgroup gpio-hal GPIO Hardware Abstraction Layer
*
* The GPIO HAL provides a set of common functions that can be used in a
* platform-independent fashion.
*
* Internally, the GPIO HAL handles edge detection handling and also provides
* fallback functions for GPIO pin toggling if the hardware does not have
* a direct method of toggling pins through direct register access.
*
* @{
*
* \file
* Header file for the GPIO HAL
*/
/*---------------------------------------------------------------------------*/
#ifndef GPIO_HAL_H_
#define GPIO_HAL_H_
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include <stdint.h>
/*---------------------------------------------------------------------------*/
/**
* \brief Specifies whether software-based pin toggle is required
*
* Some MCUs allow GPIO pin toggling via direct register access. For these
* MCUs, define GPIO_HAL_CONF_ARCH_SW_TOGGLE to 0 and then implement
* gpio_hal_arch_toggle_pin() and gpio_hal_arch_toggle_pins()
*
* \sa gpio_hal_arch_toggle_pin()
* \sa gpio_hal_arch_toggle_pins()
*/
#ifdef GPIO_HAL_CONF_ARCH_SW_TOGGLE
#define GPIO_HAL_ARCH_SW_TOGGLE GPIO_HAL_CONF_ARCH_SW_TOGGLE
#else
#define GPIO_HAL_ARCH_SW_TOGGLE 1
#endif
/*---------------------------------------------------------------------------*/
/**
* \brief GPIO pin number representation
*/
typedef uint8_t gpio_hal_pin_t;
/**
* \brief GPIO pin configuration
*
* A logical representation of a pin's configuration. It is an OR combination
* of GPIO_HAL_PIN_CFG_xyz macros.
*/
typedef uint8_t gpio_hal_pin_cfg_t;
#ifdef GPIO_HAL_CONF_PIN_COUNT
#define GPIO_HAL_PIN_COUNT GPIO_HAL_CONF_PIN_COUNT
#else
#define GPIO_HAL_PIN_COUNT 32
#endif
#if GPIO_HAL_PIN_COUNT > 32
typedef uint64_t gpio_hal_pin_mask_t;
#else
/**
* \brief GPIO pin mask representation
*/
typedef uint32_t gpio_hal_pin_mask_t;
#endif
typedef void (*gpio_hal_callback_t)(gpio_hal_pin_mask_t pin_mask);
/*---------------------------------------------------------------------------*/
#define GPIO_HAL_PIN_CFG_PULL_NONE 0x00
#define GPIO_HAL_PIN_CFG_PULL_UP 0x01
#define GPIO_HAL_PIN_CFG_PULL_DOWN 0x02
#define GPIO_HAL_PIN_CFG_PULL_MASK (GPIO_HAL_PIN_CFG_PULL_UP | \
GPIO_HAL_PIN_CFG_PULL_DOWN)
#define GPIO_HAL_PIN_CFG_EDGE_NONE 0x00
#define GPIO_HAL_PIN_CFG_EDGE_RISING 0x04
#define GPIO_HAL_PIN_CFG_EDGE_FALLING 0x08
#define GPIO_HAL_PIN_CFG_EDGE_BOTH (GPIO_HAL_PIN_CFG_EDGE_RISING | \
GPIO_HAL_PIN_CFG_EDGE_FALLING)
#define GPIO_HAL_PIN_CFG_INT_DISABLE 0x00
#define GPIO_HAL_PIN_CFG_INT_ENABLE 0x80
#define GPIO_HAL_PIN_CFG_INT_MASK 0x80
/*---------------------------------------------------------------------------*/
/**
* \brief Datatype for GPIO event handlers
*
* A GPIO event handler is a function that gets called whenever a pin triggers
* an event. The same handler can be registered to handle events for more than
* one pin by setting the respective pin's position but in \e pin_mask.
*/
typedef struct gpio_hal_event_handler_s {
struct gpio_hal_event_handler_s *next;
gpio_hal_callback_t handler;
gpio_hal_pin_mask_t pin_mask;
} gpio_hal_event_handler_t;
/*---------------------------------------------------------------------------*/
/**
* \name Core GPIO functions
*
* Functions implemented by the HAL itself
* @{
*/
/**
* \brief Initialise the GPIO HAL
*/
void gpio_hal_init(void);
/**
* \brief Register a function to be called whenever a pin triggers an event
* \param handler The handler representation
*
* The handler must be pre-allocated statically by the caller.
*
* This function can be used to register a function to be called by the HAL
* whenever a GPIO interrupt occurs.
*
* \sa gpio_hal_event_handler
*/
void gpio_hal_register_handler(gpio_hal_event_handler_t *handler);
/**
* \brief The platform-independent GPIO event handler
* \param pins OR mask of pins that generated an event
*
* Whenever a GPIO input interrupt occurs (edge or level detection) and an ISR
* is triggered, the ISR must call this function, passing as argument an ORd
* mask of the pins that triggered the interrupt. This function will then
* call the registered event handlers (if any) for the pins that triggered the
* event. The platform code should make no assumptions as to the order that
* the handlers will be called.
*
* If a pin set in the mask has an event handler registered, this function
* will call the registered handler.
*
* This function will not clear any CPU interrupt flags, this should be done
* by the calling ISR.
*
* \sa gpio_hal_register_handler
*/
void gpio_hal_event_handler(gpio_hal_pin_mask_t pins);
/**
* \brief Convert a pin to a pin mask
* \param pin The pin
* \return The corresponding mask
*/
#define gpio_hal_pin_to_mask(pin) (1 << (pin))
/** @} */
/*---------------------------------------------------------------------------*/
/**
* \name Functions to be provided by the platform
*
* All the functions below must be provided by the platform's developer. The
* HAL offers the developer a number of options of how to provide the required
* functionality.
*
* - The developer can provide a symbol. For example, the developer can create
* a .c file and implement a function called gpio_hal_arch_set_pin()
* - The developer can provide a function-like macro that has the same name as
* the function declared here. In this scenario, the declaration here will
* be removed by the pre-processor. For example, the developer can do
* something like:
*
* \code
* #define gpio_hal_arch_write_pin(p, v) platform_sdk_function(p, v)
* \endcode
*
* - The developer can provide a static inline implementation. For this to
* work, the developer can do something like:
*
* \code
* #define gpio_hal_arch_set_pin(p) set_pin(p)
* static inline void set_pin(gpio_hal_pin_t pin) { ... }
* \endcode
*
* In the latter two cases, the developer will likely provide implementations
* in a header file. In this scenario, one of the platform's configuration
* files must define GPIO_HAL_CONF_ARCH_HDR_PATH to the name of this header
* file. For example:
*
* \code
* #define GPIO_HAL_CONF_ARCH_HDR_PATH "dev/gpio-hal-arch.h"
* \endcode
*
* @{
*/
/*---------------------------------------------------------------------------*/
/* Include Arch-Specific conf */
#ifdef GPIO_HAL_CONF_ARCH_HDR_PATH
#include GPIO_HAL_CONF_ARCH_HDR_PATH
#endif /* GPIO_HAL_CONF_ARCH_HDR_PATH */
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_interrupt_enable
/**
* \brief Enable interrupts for a gpio pin
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_interrupt_enable(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_interrupt_disable
/**
* \brief Disable interrupts for a gpio pin
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_interrupt_disable(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_pin_cfg_set
/**
* \brief Configure a gpio pin
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
* \param cfg The configuration
*
* \e cfg is an OR mask of GPIO_HAL_PIN_CFG_xyz
*
* The implementation of this function also has to make sure that \e pin is
* configured as software-controlled GPIO.
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_pin_cfg_set(gpio_hal_pin_t pin, gpio_hal_pin_cfg_t cfg);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_pin_cfg_get
/**
* \brief Read the configuration of a GPIO pin
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
* \return An OR mask of GPIO_HAL_PIN_CFG_xyz
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
gpio_hal_pin_cfg_t gpio_hal_arch_pin_cfg_get(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_pin_set_input
/**
* \brief Configure a pin as GPIO input
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
*
* The implementation of this function also has to make sure that \e pin is
* configured as software-controlled GPIO.
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_pin_set_input(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_pin_set_output
/**
* \brief Configure a pin as GPIO output
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
*
* The implementation of this function also has to make sure that \e pin is
* configured as software-controlled GPIO.
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_pin_set_output(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_set_pin
/**
* \brief Set a GPIO pin to logical high
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_set_pin(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_clear_pin
/**
* \brief Clear a GPIO pin (logical low)
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_clear_pin(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_toggle_pin
/**
* \brief Toggle a GPIO pin
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
*
* Some MCUs allow GPIO pin toggling directly via register access. In this
* case, it is a good idea to provide an implementation of this function.
* However, a default, software-based implementation is also provided by the
* HAL and can be used if the MCU does not have a pin toggle register. To use
* the HAL function, define GPIO_HAL_ARCH_SW_TOGGLE as 1. To provide your own
* implementation, define GPIO_HAL_ARCH_SW_TOGGLE as 0.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_toggle_pin(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_read_pin
/**
* \brief Read a GPIO pin
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
* \retval 0 The pin is logical low
* \retval 1 The pin is logical high
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
uint8_t gpio_hal_arch_read_pin(gpio_hal_pin_t pin);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_write_pin
/**
* \brief Write a GPIO pin
* \param pin The GPIO pin number (0...GPIO_HAL_PIN_COUNT - 1)
* \param value 0: Logical low; 1: Logical high
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_write_pin(gpio_hal_pin_t pin, uint8_t value);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_set_pins
/**
* \brief Set multiple pins to logical high
* \param pins An ORd pin mask of the pins to set
*
* A pin will be set to logical high if its position in \e pins is set. For
* example you can set pins 0 and 3 by passing 0x09.
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_set_pins(gpio_hal_pin_mask_t pins);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_clear_pins
/**
* \brief Clear multiple pins to logical low
* \param pins An ORd pin mask of the pins to clear
*
* A pin will be set to logical low if its position in \e pins is set. For
* example you can clear pins 0 and 3 by passing 0x09.
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_clear_pins(gpio_hal_pin_mask_t pins);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_toggle_pins
/**
* \brief Toggle multiple pins
* \param pins An ORd pin mask of the pins to toggle
*
* A pin will be toggled if its position in \e pins is set. For example you
* can toggle pins 0 and 3 by passing 0x09.
*
* Some MCUs allow GPIO pin toggling directly via register access. In this
* case, it is a good idea to provide an implementation of this function.
* However, a default, software-based implementation is also provided by the
* HAL and can be used if the MCU does not have a pin toggle register. To use
* the HAL function, define GPIO_HAL_ARCH_SW_TOGGLE as 1. To provide your own
* implementation, define GPIO_HAL_ARCH_SW_TOGGLE as 0.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_toggle_pins(gpio_hal_pin_mask_t pins);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_read_pins
/**
* \brief Read multiple pins
* \param pins An ORd pin mask of the pins to read
* \retval An ORd mask of the pins that are high
*
* If the position of the pin in \e pins is set and the pin is logical high
* then the position of the pin in the return value will be set. For example,
* if you pass 0x09 as the value of \e pins and the return value is 0x08 then
* pin 3 is logical high and pin 0 is logical low.
*
* It is the platform developer's responsibility to provide an implementation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
gpio_hal_pin_mask_t gpio_hal_arch_read_pins(gpio_hal_pin_mask_t pins);
#endif
/*---------------------------------------------------------------------------*/
#ifndef gpio_hal_arch_write_pins
/**
* \brief Write multiple pins
* \param pins An ORd pin mask of the pins to write
* \param value An ORd mask of the value to write
*
* The function will modify GPIO pins that have their position in the mask set.
* pins, the function will write the value specified in the corresponding
* position in \e value.
* For example, you can set pin 3 and clear pin 0 by a single call to this
* function. To achieve this, \e pins must be 0x09 and \e value 0x08.
*
* It is the platform developer's responsibility to provide an implementation.
*
* There is no guarantee that this function will result in an atomic operation.
*
* The implementation can be provided as a global symbol, an inline function
* or a function-like macro, as described above.
*/
void gpio_hal_arch_write_pins(gpio_hal_pin_mask_t pins,
gpio_hal_pin_mask_t value);
#endif
/** @} */
/*---------------------------------------------------------------------------*/
#endif /* GPIO_HAL_H_ */
/*---------------------------------------------------------------------------*/
/**
* @}
* @}
*/
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment