130 lines
4.0 KiB
C
130 lines
4.0 KiB
C
/****************************************************************************
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* boards/arm/imxrt/imxrt1020-evk/src/imxrt_buttons.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 <sys/types.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/irq.h>
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#include <arch/board/board.h>
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#include "arm_internal.h"
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#include "imxrt_config.h"
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#include "imxrt_irq.h"
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#include "imxrt_gpio.h"
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#include "imxrt1020-evk.h"
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#ifdef CONFIG_ARCH_BUTTONS
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The imxrt1020-evk has 1 user button:
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*
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* 1. SW2 (IRQ88) EMC-16
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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: 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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/* Configure the buttons as input */
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imxrt_config_gpio(GPIO_SWWAKE);
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return 1;
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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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* 8-bit bit set with each bit associated with a button. See the
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* BUTTON_*_BIT definitions in board.h for the meaning of each bit.
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*
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****************************************************************************/
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uint8_t board_buttons(void)
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{
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uint8_t ret = 0;
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if (!imxrt_gpio_read(GPIO_SWWAKE))
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{
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ret |= BUTTON_WAKE_BIT;
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}
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return ret;
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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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* board_button_irq() may be called to register an interrupt handler that
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* will be called when a button is depressed or released. The ID value is
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* a button enumeration value that uniquely identifies a button resource.
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* See the BUTTON_* definitions in board.h for the meaning of enumeration
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* value.
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*
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****************************************************************************/
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#ifdef CONFIG_ARCH_IRQBUTTONS
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int board_button_irq(int id, xcpt_t irqhandler)
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{
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int ret = -EINVAL;
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/* The button has already been configured as an interrupting input (by
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* board_button_initialize() above).
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*
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* Attach the new button handler.
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*/
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ret = irq_attach(id, irqhandler, NULL);
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/* Then make sure that interrupts are enabled on the pin */
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up_enable_irq(id);
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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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