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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