/arch/arm/src/stm32l4/stm32l4_exti_wakeup.c
C | 153 lines | 51 code | 26 blank | 76 comment | 3 complexity | db34cf3f96b9d3f0b120c4d7e3094b80 MD5 | raw file
Possible License(s): 0BSD
- /****************************************************************************
- * arch/arm/src/stm32l4/stm32l4_exti_wakeup.c
- *
- * Copyright (C) 2009, 2012, 2017 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- * Juha Niskanen <juha.niskanen@haltian.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 "stm32l4_gpio.h"
- #include "stm32l4_exti.h"
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- /* Interrupt handlers attached to the RTC WAKEUP EXTI */
- static xcpt_t g_wakeup_callback;
- static void *g_callback_arg;
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: stm32l4_exti_wakeup_isr
- *
- * Description:
- * EXTI periodic WAKEUP interrupt service routine/dispatcher
- *
- ****************************************************************************/
- static int stm32l4_exti_wakeup_isr(int irq, void *context, FAR void *arg)
- {
- int ret = OK;
- /* Dispatch the interrupt to the handler */
- if (g_wakeup_callback != NULL)
- {
- ret = g_wakeup_callback(irq, context, g_callback_arg);
- }
- /* Clear the pending EXTI interrupt */
- putreg32(EXTI1_RTC_WAKEUP, STM32L4_EXTI1_PR);
- return ret;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: stm32l4_exti_wakeup
- *
- * Description:
- * Sets/clears EXTI wakeup interrupt.
- *
- * Parameters:
- * - rising/falling edge: enables interrupt on rising/falling edges
- * - event: generate event when set
- * - func: when non-NULL, generate interrupt
- *
- * Returned Value:
- * Zero (OK) on success; a negated errno value on failure indicating the
- * nature of the failure.
- *
- ****************************************************************************/
- int stm32l4_exti_wakeup(bool risingedge, bool fallingedge, bool event,
- xcpt_t func, void *arg)
- {
- g_wakeup_callback = func;
- g_callback_arg = arg;
- /* Install external interrupt handlers (if not already attached) */
- if (func)
- {
- irq_attach(STM32L4_IRQ_RTC_WKUP, stm32l4_exti_wakeup_isr, NULL);
- up_enable_irq(STM32L4_IRQ_RTC_WKUP);
- }
- else
- {
- up_disable_irq(STM32L4_IRQ_RTC_WKUP);
- }
- /* Configure rising/falling edges */
- modifyreg32(STM32L4_EXTI1_RTSR,
- risingedge ? 0 : EXTI1_RTC_WAKEUP,
- risingedge ? EXTI1_RTC_WAKEUP : 0);
- modifyreg32(STM32L4_EXTI1_FTSR,
- fallingedge ? 0 : EXTI1_RTC_WAKEUP,
- fallingedge ? EXTI1_RTC_WAKEUP : 0);
- /* Enable Events and Interrupts */
- modifyreg32(STM32L4_EXTI1_EMR,
- event ? 0 : EXTI1_RTC_WAKEUP,
- event ? EXTI1_RTC_WAKEUP : 0);
- modifyreg32(STM32L4_EXTI1_IMR,
- func ? 0 : EXTI1_RTC_WAKEUP,
- func ? EXTI1_RTC_WAKEUP : 0);
- return OK;
- }