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/*
* MIT License
*
* Copyright (c) 2020 Joey Castillo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _WATCH_EXTINT_H_INCLUDED
#define _WATCH_EXTINT_H_INCLUDED
////< @file watch_extint.h
#include "watch.h"
#include "hal_ext_irq.h"
/** @addtogroup buttons Buttons & External Interrupts
* @brief This section covers functions related to the three buttons: Light, Mode and Alarm, as well as
* external interrupts from devices on the nine-pin connector.
* @details The buttons are the core input UI of the watch, and the way the user will interact with
* your application. They are active high, pulled down by the microcontroller, and triggered
* when one of the "pushers" brings a tab from the metal frame into contact with the edge
* of the board. Note that the buttons can only wake the watch from STANDBY mode, at least as
* of the current SAM L22 silicon revision. The external interrupt controller runs in STANDBY
* mode, but it does not run in BACKUP mode; to wake from BACKUP, buttons will not cut it.
*/
/// @{
///@brief An enum defining the types of interrupt trigger you wish to scan for.
typedef enum watch_interrupt_trigger {
INTERRUPT_TRIGGER_NONE = 0,
INTERRUPT_TRIGGER_RISING,
INTERRUPT_TRIGGER_FALLING,
INTERRUPT_TRIGGER_BOTH,
} watch_interrupt_trigger;
/// @brief Enables the external interrupt controller.
void watch_enable_external_interrupts(void);
/// @brief Disables the external interrupt controller.
void watch_disable_external_interrupts(void);
/** @brief Configures an external interrupt callback on one of the external interrupt pins.
* @details You can set one interrupt callback per pin, and you can monitor for a rising condition,
* a falling condition, or both. If you just want to detect a button press, register your
* interrupt with INTERRUPT_TRIGGER_RISING; if you want to detect an active-low interrupt
* signal from a device on the nine-pin connector, use INTERRUPT_TRIGGER_FALLING. If you
* want to detect both rising and falling conditions (i.e. button down and button up), use
* INTERRUPT_TRIGGER_BOTH and use watch_get_pin_level to check the pin level in your callback
* to determine which condition caused the interrupt.
* @param pin One of BTN_LIGHT, BTN_MODE, BTN_ALARM, A0, A1, A3 or A4. If the pin parameter matches one of
* the three button pins, this function will also enable an internal pull-down resistor. If
* the pin parameter is A0-A4, you are responsible for setting any required pull configuration
* using watch_enable_pull_up or watch_enable_pull_down.
* @param callback The function you wish to have called when the button is pressed.
* @param trigger The condition on which you wish to trigger: rising, falling or both.
* @note Pins A2 and A4 can also generate interrupts via the watch_register_extwake_callback function, which
* will allow them to trigger even when the watch is in deep sleep mode.
* @warning As of now, A2 is not usable via the watch_register_interrupt_callback function. To enable an
* external interrupt on pin A2, use the watch_register_extwake_callback function. This issue will be
* addressed in a future revision of the watch library.
*/
void watch_register_interrupt_callback(const uint8_t pin, ext_irq_cb_t callback, watch_interrupt_trigger trigger);
__attribute__((deprecated("Use watch_register_interrupt_callback or watch_register_extwake_callback instead")))
void watch_register_button_callback(const uint8_t pin, ext_irq_cb_t callback);
__attribute__((deprecated("Use watch_enable_external_interrupts instead")))
void watch_enable_buttons(void);
/// @}
#endif
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