/boards/arm/tiva/tm4c1294-launchpad/src/tm4c_buttons.c
C | 171 lines | 60 code | 32 blank | 79 comment | 7 complexity | 509115d1d788986c6dda792f223107c5 MD5 | raw file
Possible License(s): Apache-2.0
- /****************************************************************************
- * boards/arm/tiva/tm4c1294-launchpad/src/tm4c_buttons.c
- *
- * Copyright (C) 2015, 2018 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 <nuttx/arch.h>
- #include <nuttx/board.h>
- #include <arch/irq.h>
- #include <arch/board/board.h>
- #include "tm4c1294-launchpad.h"
- #ifdef CONFIG_ARCH_BUTTONS
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- /* Pin configuration for each STM3210E-EVAL button. This array is indexed by
- * the BUTTON_* and JOYSTICK_* definitions in board.h
- */
- static const uint32_t g_buttons[NUM_BUTTONS] =
- {
- GPIO_SW1, GPIO_SW2
- };
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * 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. */
- for (i = 0; i < NUM_BUTTONS; i++)
- {
- tiva_configgpio(g_buttons[i]);
- }
- #ifdef CONFIG_ARCH_IRQBUTTONS
- /* Configure GPIO interrupts */
- tiva_gpioirqinitialize();
- #endif
- }
- /****************************************************************************
- * Name: board_buttons
- ****************************************************************************/
- uint32_t board_buttons(void)
- {
- uint32_t ret = 0;
- int i;
- /* Check that state of each key */
- for (i = 0; i < NUM_BUTTONS; i++)
- {
- /* A LOW value means that the key is pressed. */
- bool released = tiva_gpioread(g_buttons[i]);
- /* Accumulate the set of depressed (not released) keys */
- if (!released)
- {
- ret |= (1 << i);
- }
- }
- return ret;
- }
- /****************************************************************************
- * Name: board_button_irq
- *
- * Description:
- * This function may be called to register an interrupt handler that will
- * be called when a button is depressed or released.
- *
- ****************************************************************************/
- #ifdef CONFIG_ARCH_IRQBUTTONS
- int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
- {
- int ret;
- if (id < 0 || id >= NUM_BUTTONS)
- {
- ret = -EINVAL;
- }
- else
- {
- /* Are we attaching or detaching? */
- if (irqhandler != NULL)
- {
- ret = tiva_gpioirqattach(g_buttons[id], irqhandler, arg);
- }
- else
- {
- ret = tiva_gpioirqdetach(g_buttons[id]);
- }
- }
- return ret;
- }
- #endif
- #endif /* CONFIG_ARCH_BUTTONS */