2012-07-17 02:22:48 +02:00
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/****************************************************************************
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* arch/arm/src/stm32/stm32_exti_alarm.c
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*
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* Copyright (C) 2009, 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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* Diego Sanchez <dsanchez@nx-engineering.com>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* 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 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <arch/irq.h>
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#include "up_arch.h"
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#include "chip.h"
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#include "stm32_gpio.h"
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#include "stm32_exti.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Interrupt handlers attached to the ALARM EXTI */
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static xcpt_t stm32_exti_callback;
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/****************************************************************************
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* Public Data
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****************************************************************************/
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2015-10-04 22:59:08 +02:00
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/****************************************************************************
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2012-07-17 02:22:48 +02:00
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_exti_alarm_isr
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*
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* Description:
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2012-07-19 16:33:14 +02:00
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* EXTI ALARM interrupt service routine/dispatcher
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2012-07-17 02:22:48 +02:00
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*
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****************************************************************************/
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static int stm32_exti_alarm_isr(int irq, void *context)
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{
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int ret = OK;
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/* Clear the pending EXTI interrupt */
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putreg32(EXTI_RTC_ALARM, STM32_EXTI_PR);
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/* And dispatch the interrupt to the handler */
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if (stm32_exti_callback)
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{
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ret = stm32_exti_callback(irq, context);
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_exti_alarm
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*
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* Description:
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* Sets/clears EXTI alarm interrupt.
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*
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* Parameters:
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* - rising/falling edge: enables interrupt on rising/falling edget
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* - event: generate event when set
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* - func: when non-NULL, generate interrupt
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*
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* Returns:
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* The previous value of the interrupt handler function pointer. This
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* value may, for example, be used to restore the previous handler when
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* multiple handlers are used.
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*
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****************************************************************************/
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xcpt_t stm32_exti_alarm(bool risingedge, bool fallingedge, bool event,
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xcpt_t func)
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{
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xcpt_t oldhandler;
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/* Get the previous GPIO IRQ handler; Save the new IRQ handler. */
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oldhandler = stm32_exti_callback;
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stm32_exti_callback = func;
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/* Install external interrupt handlers (if not already attached) */
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if (func)
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{
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2012-07-19 16:33:14 +02:00
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irq_attach(STM32_IRQ_RTCALRM, stm32_exti_alarm_isr);
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up_enable_irq(STM32_IRQ_RTCALRM);
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2012-07-17 02:22:48 +02:00
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}
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else
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{
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2012-07-19 16:33:14 +02:00
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up_disable_irq(STM32_IRQ_RTCALRM);
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2012-07-17 02:22:48 +02:00
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}
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/* Configure rising/falling edges */
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modifyreg32(STM32_EXTI_RTSR,
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risingedge ? 0 : EXTI_RTC_ALARM,
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risingedge ? EXTI_RTC_ALARM : 0);
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modifyreg32(STM32_EXTI_FTSR,
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fallingedge ? 0 : EXTI_RTC_ALARM,
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fallingedge ? EXTI_RTC_ALARM : 0);
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/* Enable Events and Interrupts */
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modifyreg32(STM32_EXTI_EMR,
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event ? 0 : EXTI_RTC_ALARM,
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event ? EXTI_RTC_ALARM : 0);
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modifyreg32(STM32_EXTI_IMR,
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func ? 0 : EXTI_RTC_ALARM,
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func ? EXTI_RTC_ALARM : 0);
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/* Return the old IRQ handler */
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return oldhandler;
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2012-07-19 16:33:14 +02:00
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}
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