3d9d52de87
Only the interrupt flags that have been handled must be cleared. Otherwise, if a new interrupt occurs after the interrupt statuses are read and before they are cleared, then it is discarded without having been handled. This issue was particularly likely with two interrupt trigger conditions occurring on different pins of the same port in a short period of time. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
/*
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* Copyright (c) 2012, Texas Instruments Incorporated - http://www.ti.com/
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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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* 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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*
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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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* \addtogroup cc2538-gpio
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* @{
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*
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* \file
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* Implementation of the cc2538 GPIO controller
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*/
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#include "contiki.h"
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#include "sys/energest.h"
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#include "dev/leds.h"
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#include "dev/gpio.h"
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#include "dev/nvic.h"
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#include "reg.h"
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#include "lpm.h"
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#include <string.h>
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/**
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* \brief Pointer to a function to be called when a GPIO interrupt is detected.
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* Callbacks for Port A, Pins[0:7] are stored in positions [0:7] of this
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* buffer, Port B callbacks in [8:15] and so on
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*/
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static gpio_callback_t gpio_callbacks[32];
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/*---------------------------------------------------------------------------*/
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void
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gpio_register_callback(gpio_callback_t f, uint8_t port, uint8_t pin)
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{
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gpio_callbacks[(port << 3) + pin] = f;
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}
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/*---------------------------------------------------------------------------*/
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/** \brief Run through all registered GPIO callbacks and invoke those
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* associated with the \a port and the pins specified by \a mask
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* \param mask Search callbacks associated with pins specified by this mask
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* \param port Search callbacks associated with this port. Here, port is
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* specified as a number between 0 and 3. Port A: 0, Port B: 1 etc */
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void
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notify(uint8_t mask, uint8_t port)
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{
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uint8_t i;
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gpio_callback_t *f = &gpio_callbacks[port << 3];
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for(i = 0; i < 8; i++) {
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if(mask & (1 << i)) {
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if((*f) != NULL) {
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(*f)(port, i);
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}
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}
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f++;
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}
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}
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/*---------------------------------------------------------------------------*/
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/** \brief Interrupt service routine for Port \a port
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* \param port Number between 0 and 3. Port A: 0, Port B: 1, etc.
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*/
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static void
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gpio_port_isr(uint8_t port)
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{
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uint32_t base;
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uint8_t int_status, power_up_int_status;
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lpm_exit();
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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base = GPIO_PORT_TO_BASE(port);
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int_status = GPIO_GET_MASKED_INT_STATUS(base);
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power_up_int_status = GPIO_GET_POWER_UP_INT_STATUS(port);
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notify(int_status | power_up_int_status, port);
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GPIO_CLEAR_INTERRUPT(base, int_status);
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GPIO_CLEAR_POWER_UP_INTERRUPT(port, power_up_int_status);
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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#define GPIO_PORT_ISR(lowercase_port, uppercase_port) \
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void \
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gpio_port_##lowercase_port##_isr(void) \
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{ \
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gpio_port_isr(GPIO_##uppercase_port##_NUM); \
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}
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GPIO_PORT_ISR(a, A)
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GPIO_PORT_ISR(b, B)
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GPIO_PORT_ISR(c, C)
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GPIO_PORT_ISR(d, D)
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/*---------------------------------------------------------------------------*/
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void
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gpio_init()
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{
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memset(gpio_callbacks, 0, sizeof(gpio_callbacks));
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}
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/** @} */
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