146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
/****************************************************************************
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* arch/arm/src/stm32/stm32_exti_pwr.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 <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 "arm_internal.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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#include "stm32_exti_pwr.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 PVD EXTI */
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static xcpt_t g_pvd_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: stm32_exti_pvd_isr
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*
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* Description:
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* EXTI PVD interrupt service routine/dispatcher
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*
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****************************************************************************/
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static int stm32_exti_pvd_isr(int irq, void *context, void *arg)
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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_PVD_LINE, STM32_EXTI_PR);
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/* And dispatch the interrupt to the handler */
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if (g_pvd_callback != NULL)
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{
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ret = g_pvd_callback(irq, context, g_callback_arg);
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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_pvd
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*
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* Description:
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* Sets/clears EXTI PVD interrupt.
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*
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* Input Parameters:
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* - rising/falling edge: enables interrupt on rising/falling edge
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* - event: generate event when set
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* - func: when non-NULL, generate interrupt
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* - arg: Argument passed to the interrupt callback
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*
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* Returned Value:
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* Zero (OK) returned on success; a negated errno value is returned on
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* failure.
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*
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****************************************************************************/
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int stm32_exti_pvd(bool risingedge, bool fallingedge, bool event,
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xcpt_t func, void *arg)
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{
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/* Get the previous GPIO IRQ handler; Save the new IRQ handler. */
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g_pvd_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(STM32_IRQ_PVD, stm32_exti_pvd_isr, NULL);
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up_enable_irq(STM32_IRQ_PVD);
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}
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else
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{
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up_disable_irq(STM32_IRQ_PVD);
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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_PVD_LINE,
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risingedge ? EXTI_PVD_LINE : 0);
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modifyreg32(STM32_EXTI_FTSR,
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fallingedge ? 0 : EXTI_PVD_LINE,
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fallingedge ? EXTI_PVD_LINE : 0);
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/* Enable Events and Interrupts */
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modifyreg32(STM32_EXTI_EMR,
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event ? 0 : EXTI_PVD_LINE,
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event ? EXTI_PVD_LINE : 0);
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modifyreg32(STM32_EXTI_IMR,
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func ? 0 : EXTI_PVD_LINE,
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func ? EXTI_PVD_LINE : 0);
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return OK;
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}
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