nes-proj/cpu/cc26xx/dev/gpio-interrupt.c

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2015-02-25 12:09:56 +00:00
/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* 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.
*/
/*---------------------------------------------------------------------------*/
#include "ioc.h"
#include "gpio-interrupt.h"
#include "sys/energest.h"
#include "lpm.h"
#include "ti-lib.h"
#include <string.h>
/*---------------------------------------------------------------------------*/
#define gpio_interrupt_isr GPIOIntHandler
/*---------------------------------------------------------------------------*/
/* Handler array */
static gpio_interrupt_handler_t handlers[NUM_IO_MAX];
/*---------------------------------------------------------------------------*/
void
gpio_interrupt_register_handler(uint8_t ioid, gpio_interrupt_handler_t f)
{
uint8_t interrupts_disabled = ti_lib_int_master_disable();
/* Clear interrupts on specified pins */
ti_lib_gpio_event_clear(1 << ioid);
handlers[ioid] = f;
/* Re-enable interrupts */
if(!interrupts_disabled) {
ti_lib_int_master_enable();
}
}
/*---------------------------------------------------------------------------*/
void
gpio_interrupt_init()
{
int i;
for(i = 0; i < NUM_IO_MAX; i++) {
handlers[i] = NULL;
}
ti_lib_int_enable(INT_EDGE_DETECT);
}
/*---------------------------------------------------------------------------*/
void
gpio_interrupt_isr(void)
{
uint32_t pin_mask;
uint8_t i;
ENERGEST_ON(ENERGEST_TYPE_IRQ);
/* Read interrupt flags */
pin_mask = (HWREG(GPIO_BASE + GPIO_O_EVFLAGS31_0) & GPIO_PIN_MASK);
/* Clear the interrupt flags */
HWREG(GPIO_BASE + GPIO_O_EVFLAGS31_0) = pin_mask;
/* Run custom ISRs */
for(i = 0; i < NUM_GPIO_PINS; i++) {
/* Call the handler if there is one registered for this event */
if((pin_mask & (1 << i)) && handlers[i] != NULL) {
handlers[i](i);
}
}
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/