136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/****************************************************************************
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* arch/arm/src/stm32wb/stm32wb_exti_wakeup.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <stdint.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include "chip.h"
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#include "stm32wb_gpio.h"
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#include "stm32wb_exti.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Interrupt handlers attached to the RTC WAKEUP EXTI */
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static xcpt_t g_wakeup_callback;
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static void *g_callback_arg;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32wb_exti_wakeup_isr
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*
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* Description:
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* EXTI periodic WAKEUP interrupt service routine/dispatcher
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*
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****************************************************************************/
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static int stm32wb_exti_wakeup_isr(int irq, void *context, void *arg)
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{
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int ret = OK;
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/* Dispatch the interrupt to the handler */
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if (g_wakeup_callback != NULL)
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{
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ret = g_wakeup_callback(irq, context, g_callback_arg);
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}
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/* Clear the pending EXTI interrupt */
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putreg32(EXTI_RTC_WAKEUP, STM32WB_EXTI_PR1);
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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: stm32wb_exti_wakeup
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*
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* Description:
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* Sets/clears EXTI wakeup interrupt.
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*
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* Input Parameters:
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* - rising/falling edge: enables interrupt on rising/falling edges
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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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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure indicating the
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* nature of the failure.
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*
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****************************************************************************/
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int stm32wb_exti_wakeup(bool risingedge, bool fallingedge, bool event,
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xcpt_t func, void *arg)
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{
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g_wakeup_callback = func;
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g_callback_arg = arg;
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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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irq_attach(STM32WB_IRQ_RTC_WKUP, stm32wb_exti_wakeup_isr, NULL);
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up_enable_irq(STM32WB_IRQ_RTC_WKUP);
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}
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else
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{
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up_disable_irq(STM32WB_IRQ_RTC_WKUP);
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}
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/* Configure rising/falling edges */
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modifyreg32(STM32WB_EXTI_RTSR1,
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risingedge ? 0 : EXTI_RTSR1_RT(EXTI_EVT_RTCWAKEUP),
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risingedge ? EXTI_RTSR1_RT(EXTI_EVT_RTCWAKEUP) : 0);
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modifyreg32(STM32WB_EXTI_FTSR1,
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fallingedge ? 0 : EXTI_FTSR1_FT(EXTI_EVT_RTCWAKEUP),
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fallingedge ? EXTI_FTSR1_FT(EXTI_EVT_RTCWAKEUP) : 0);
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/* Enable Events and Interrupts */
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modifyreg32(STM32WB_EXTI_C1EMR1,
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event ? 0 : EXTI_C1EMR1_EM(EXTI_EVT_RTCWAKEUP),
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event ? EXTI_C1EMR1_EM(EXTI_EVT_RTCWAKEUP) : 0);
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modifyreg32(STM32WB_EXTI_C1IMR1,
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func ? 0 : EXTI_C1IMR1_IM(EXTI_EVT_RTCWAKEUP),
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func ? EXTI_C1IMR1_IM(EXTI_EVT_RTCWAKEUP) : 0);
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return OK;
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}
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