85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Perry Hung.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file ext_interrupts.c
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*
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* @brief Wiring-like interface for external interrupts
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*/
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#include "boards.h"
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#include <libmaple/gpio.h>
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#include <libmaple/exti.h>
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#include "ext_interrupts.h"
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static inline exti_trigger_mode exti_out_mode(ExtIntTriggerMode mode);
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/**
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* @brief Attach an interrupt handler to a pin, triggering on the given mode.
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* @param pin Pin to attach an interrupt handler onto.
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* @param handler Function to call when the external interrupt is triggered.
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* @param mode Trigger mode for the given interrupt.
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* @see ExtIntTriggerMode
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*/
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void attachInterrupt(uint8 pin, voidFuncPtr handler, ExtIntTriggerMode mode) {
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if (pin >= BOARD_NR_GPIO_PINS || !handler) {
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return;
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}
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exti_trigger_mode outMode = exti_out_mode(mode);
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exti_attach_interrupt((afio_exti_num)(pin&0x0F),
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gpio_exti_port(PIN_MAP[pin].gpio_device),
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handler,
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outMode);
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}
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/**
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* @brief Disable any external interrupt attached to a pin.
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* @param pin Pin number to detach any interrupt from.
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*/
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void detachInterrupt(uint8 pin) {
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if (pin >= BOARD_NR_GPIO_PINS) {
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return;
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}
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exti_detach_interrupt((afio_exti_num)(pin&0x0F));
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}
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static inline exti_trigger_mode exti_out_mode(ExtIntTriggerMode mode) {
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switch (mode) {
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case RISING:
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return EXTI_RISING;
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case FALLING:
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return EXTI_FALLING;
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case CHANGE:
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return EXTI_RISING_FALLING;
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}
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// Can't happen
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ASSERT(0);
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return (exti_trigger_mode)0;
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}
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