136 lines
4.2 KiB
C
136 lines
4.2 KiB
C
/****************************************************************************
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* boards/arm/max326xx/max32660-evsys/src/max326_button.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 <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/board.h>
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#include <nuttx/irq.h>
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#include <nuttx/spinlock.h>
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#include <nuttx/irq.h>
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#include "max326_gpio.h"
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#include "max32660-evsys.h"
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#include <arch/board/board.h>
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#ifdef CONFIG_ARCH_BUTTONS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_button_initialize
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*
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* Description:
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* board_button_initialize() must be called to initialize button resources.
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* After that, board_buttons() may be called to collect the current state
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* of all buttons or board_button_irq() may be called to register button
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* interrupt handlers.
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*
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****************************************************************************/
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uint32_t board_button_initialize(void)
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{
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max326_gpio_config(GPIO_BUTTON);
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return NUM_BUTTONS;
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}
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/****************************************************************************
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* Name: board_buttons
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*
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* Description:
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* After board_button_initialize() has been called, board_buttons() may be
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* called to collect the state of all buttons. board_buttons() returns an
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* 32-bit bit set with each bit associated with a button. See the BUTTON*
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* definitions above for the meaning of each bit in the returned value.
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*
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****************************************************************************/
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uint32_t board_buttons(void)
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{
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return !max326_gpio_read(GPIO_BUTTON) ? 0 : BUTTON_SW2_BIT;
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}
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/****************************************************************************
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* Name: board_button_irq
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*
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* Description:
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* This function may be called to register an interrupt handler that will
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* be called when a button is depressed or released. The ID value is one
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* of the BUTTON* definitions provided above.
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*
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* Configuration Notes:
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* Configuration CONFIG_SAMA5_PIO_IRQ must be selected to enable the
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* overall PIO IRQ feature and CONFIG_SAMA5_PIOB_IRQ must be enabled to
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* select PIOs to support interrupts on PIOE.
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*
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****************************************************************************/
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#if defined(CONFIG_SAMA5_PIOB_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
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int board_button_irq(int id, xcpt_t irqhandler, void *arg)
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{
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int ret = -EINVAL;
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if (id == BUTTON_SW2)
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{
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irqstate_t flags;
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/* Disable interrupts until we are done. This guarantees that the
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* following operations are atomic.
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*/
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flags = spin_lock_irqsave(NULL);
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/* Are we attaching or detaching? */
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if (irqhandler != NULL)
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{
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/* Configure the interrupt */
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irq_attach(BUTTON_IRQ, irqhandler, arg);
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up_enable_irq(BUTTON_IRQ);
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}
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else
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{
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/* Disable and detach the interrupt */
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up_disable_irq(BUTTON_IRQ);
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irq_detach(BUTTON_IRQ);
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}
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spin_unlock_irqrestore(NULL, flags);
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ret = OK;
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}
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return ret;
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}
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#endif
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#endif /* CONFIG_ARCH_BUTTONS */
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