/boards/arm/stm32/olimex-stm32-h407/src/stm32_buttons.c
C | 151 lines | 42 code | 24 blank | 85 comment | 4 complexity | 7b2b127cd17235399c27a5233ba385bf MD5 | raw file
Possible License(s): Apache-2.0
- /****************************************************************************
- * boards/arm/stm32/olimex-stm32-h407/src/stm32_buttons.c
- *
- * Copyright (C) 2014-2015, 2017 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <stdint.h>
- #include <errno.h>
- #include <nuttx/arch.h>
- #include <nuttx/board.h>
- #include <arch/board/board.h>
- #include "olimex-stm32-h407.h"
- #ifdef CONFIG_ARCH_BUTTONS
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- /* Pin configuration for each Olimex-STM32-H405 button. This array is indexed by
- * the BUTTON_* definitions in board.h
- */
- static const uint32_t g_buttons[NUM_BUTTONS] =
- {
- GPIO_BTN_BUT
- };
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: board_button_initialize
- *
- * Description:
- * board_button_initialize() must be called to initialize button resources.
- * After that, board_buttons() may be called to collect the current state
- * of all buttons or board_button_irq() may be called to register button
- * interrupt handlers.
- *
- ****************************************************************************/
- void board_button_initialize(void)
- {
- int i;
- /* Configure the GPIO pins as inputs. NOTE that EXTI interrupts are
- * configured for all pins.
- */
- for (i = 0; i < NUM_BUTTONS; i++)
- {
- stm32_configgpio(g_buttons[i]);
- }
- }
- /****************************************************************************
- * Name: board_buttons
- ****************************************************************************/
- uint32_t board_buttons(void)
- {
- uint32_t ret = 0;
- /* Check that state of each key */
- if (!stm32_gpioread(g_buttons[BUTTON_BUT]))
- {
- ret |= BUTTON_BUT_BIT;
- }
- return ret;
- }
- /****************************************************************************
- * Button support.
- *
- * Description:
- * board_button_initialize() must be called to initialize button resources.
- * After that, board_buttons() may be called to collect the current state
- * of all buttons or board_button_irq() may be called to register button
- * interrupt handlers.
- *
- * After board_button_initialize() has been called, board_buttons() may be
- * called to collect the state of all buttons. board_buttons() returns an
- * 32-bit bit set with each bit associated with a button. See the BUTTON_*_BIT
- * definitions in board.h for the meaning of each bit.
- *
- * board_button_irq() may be called to register an interrupt handler that
- * will be called when a button is depressed or released. The ID value is
- * a button enumeration value that uniquely identifies a button resource.
- * See the BUTTON_* definitions in board.h for the meaning of enumeration
- * value.
- *
- ****************************************************************************/
- #ifdef CONFIG_ARCH_IRQBUTTONS
- int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
- {
- int ret = -EINVAL;
- /* The following should be atomic */
- if (id >= MIN_IRQBUTTON && id <= MAX_IRQBUTTON)
- {
- ret = stm32_gpiosetevent(g_buttons[id], true, true, true, irqhandler,
- arg);
- }
- return ret;
- }
- #endif
- #endif /* CONFIG_ARCH_BUTTONS */