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/****************************************************************************
* arch/arm/src/stm32/stm32_exti_alarm.c
*
* Copyright (C) 2009, 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
* Diego Sanchez <dsanchez@nx-engineering.com>
*
* 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 NuttX 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 OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <arch/irq.h>
#include "up_arch.h"
#include "chip.h"
#include "stm32_gpio.h"
#include "stm32_exti.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* Interrupt handlers attached to the ALARM EXTI */
static xcpt_t stm32_exti_callback;
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_exti_alarm_isr
*
* Description:
* EXTI ALARM interrupt service routine/dispatcher
*
****************************************************************************/
static int stm32_exti_alarm_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending EXTI interrupt */
putreg32(EXTI_RTC_ALARM, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callback)
{
ret = stm32_exti_callback(irq, context);
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_exti_alarm
*
* Description:
* Sets/clears EXTI alarm interrupt.
*
* Parameters:
* - rising/falling edge: enables interrupt on rising/falling edget
* - event: generate event when set
* - func: when non-NULL, generate interrupt
*
* Returns:
* The previous value of the interrupt handler function pointer. This
* value may, for example, be used to restore the previous handler when
* multiple handlers are used.
*
****************************************************************************/
xcpt_t stm32_exti_alarm(bool risingedge, bool fallingedge, bool event,
xcpt_t func)
{
xcpt_t oldhandler;
/* Get the previous GPIO IRQ handler; Save the new IRQ handler. */
oldhandler = stm32_exti_callback;
stm32_exti_callback = func;
/* Install external interrupt handlers (if not already attached) */
if (func)
{
irq_attach(STM32_IRQ_RTCALRM, stm32_exti_alarm_isr);
up_enable_irq(STM32_IRQ_RTCALRM);
}
else
{
up_disable_irq(STM32_IRQ_RTCALRM);
}
/* Configure rising/falling edges */
modifyreg32(STM32_EXTI_RTSR,
risingedge ? 0 : EXTI_RTC_ALARM,
risingedge ? EXTI_RTC_ALARM : 0);
modifyreg32(STM32_EXTI_FTSR,
fallingedge ? 0 : EXTI_RTC_ALARM,
fallingedge ? EXTI_RTC_ALARM : 0);
/* Enable Events and Interrupts */
modifyreg32(STM32_EXTI_EMR,
event ? 0 : EXTI_RTC_ALARM,
event ? EXTI_RTC_ALARM : 0);
modifyreg32(STM32_EXTI_IMR,
func ? 0 : EXTI_RTC_ALARM,
func ? EXTI_RTC_ALARM : 0);
/* Return the old IRQ handler */
return oldhandler;
}
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