40cd67eee6
Gregory Nutt has submitted the SGA and we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
159 lines
4.4 KiB
C
159 lines
4.4 KiB
C
/****************************************************************************
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* boards/arm/tiva/tm4c1294-launchpad/src/tm4c_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 <stdint.h>
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#include <nuttx/arch.h>
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#include <nuttx/board.h>
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#include <arch/irq.h>
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#include <arch/board/board.h>
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#include "tm4c1294-launchpad.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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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Pin configuration for each STM3210E-EVAL button. This array is indexed by
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* the BUTTON_* and JOYSTICK_* definitions in board.h
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*/
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static const uint32_t g_buttons[NUM_BUTTONS] =
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{
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GPIO_SW1, GPIO_SW2
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};
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/****************************************************************************
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* Private Functions
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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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int i;
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/* Configure the GPIO pins as inputs. */
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for (i = 0; i < NUM_BUTTONS; i++)
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{
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tiva_configgpio(g_buttons[i]);
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}
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#ifdef CONFIG_ARCH_IRQBUTTONS
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/* Configure GPIO interrupts */
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tiva_gpioirqinitialize();
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#endif
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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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uint32_t board_buttons(void)
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{
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uint32_t ret = 0;
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int i;
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/* Check that state of each key */
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for (i = 0; i < NUM_BUTTONS; i++)
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{
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/* A LOW value means that the key is pressed. */
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bool released = tiva_gpioread(g_buttons[i]);
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/* Accumulate the set of depressed (not released) keys */
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if (!released)
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{
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ret |= (1 << i);
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}
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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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* 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.
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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;
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if (id < 0 || id >= NUM_BUTTONS)
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{
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ret = -EINVAL;
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}
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else
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{
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/* Are we attaching or detaching? */
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if (irqhandler != NULL)
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{
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ret = tiva_gpioirqattach(g_buttons[id], irqhandler, arg);
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}
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else
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{
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ret = tiva_gpioirqdetach(g_buttons[id]);
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}
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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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