129 lines
4.7 KiB
C
129 lines
4.7 KiB
C
/****************************************************************************
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* configs/nucleo-f072rb/src/stm32_buttons.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/arch.h>
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#include <nuttx/board.h>
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#include <arch/board/board.h>
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#include "stm32f0_gpio.h"
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#include "nucleo-f072rb.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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void board_button_initialize(void)
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{
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/* Configure the single button as an input. NOTE that EXTI interrupts are
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* also configured for the pin.
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*/
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stm32f0_configgpio(GPIO_BTN_USER);
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}
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/****************************************************************************
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* Name: board_buttons
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****************************************************************************/
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uint32_t board_buttons(void)
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{
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/* Check that state of each USER button. A LOW value means that the key is
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* pressed.
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*/
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bool released = stm32f0_gpioread(GPIO_BTN_USER);
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return !released;
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}
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/************************************************************************************
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* Button support.
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*
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* Description:
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* board_button_initialize() must be called to initialize button resources. After
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* that, board_buttons() may be called to collect the current state of all
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* buttons or board_button_irq() may be called to register button interrupt
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* handlers.
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*
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* After board_button_initialize() has been called, board_buttons() may be called to
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* collect the state of all buttons. board_buttons() returns an 32-bit bit set
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* with each bit associated with a button. See the BUTTON_*_BIT
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* definitions in board.h for the meaning of each bit.
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*
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* board_button_irq() 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 a
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* button enumeration value that uniquely identifies a button resource. See the
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* 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, FAR void *arg)
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{
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int ret = -EINVAL;
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if (id == BUTTON_USER)
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{
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ret = stm32f0_gpiosetevent(GPIO_BTN_USER, true, true, true, irqhandler, arg);
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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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