2013-02-13 02:33:37 +01:00
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/****************************************************************************
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2019-08-13 18:08:49 +02:00
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* boards/arm/lpc17xx_40xx/lpc4088-quickstart/src/lpc17_40_buttons.c
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2013-02-13 02:33:37 +01:00
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*
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2021-03-17 18:14:12 +01:00
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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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2013-02-13 02:33:37 +01:00
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*
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2021-03-17 18:14:12 +01:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2013-02-13 02:33:37 +01:00
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*
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2021-03-17 18:14:12 +01:00
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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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2013-02-13 02:33:37 +01:00
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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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2017-03-02 21:37:22 +01:00
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#include <errno.h>
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2013-02-13 02:33:37 +01:00
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#include <nuttx/arch.h>
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2015-02-28 03:02:03 +01:00
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#include <nuttx/board.h>
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2013-02-13 02:33:37 +01:00
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#include <nuttx/irq.h>
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#include <arch/board/board.h>
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2019-07-11 18:50:00 +02:00
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#include "lpc17_40_gpio.h"
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#include "lpc4088-quickstart.h"
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2013-02-13 02:33:37 +01:00
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#ifdef CONFIG_ARCH_BUTTONS
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/****************************************************************************
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* Private Data
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****************************************************************************/
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2017-09-16 21:48:06 +02:00
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2019-08-13 18:08:49 +02:00
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/* The LPC4088 Quickstart supports several buttons.
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* All will read "1" when open and "0" when closed
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2013-03-11 21:26:55 +01:00
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*
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2019-07-11 18:50:00 +02:00
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* USER1 -- Connected to P2[10]
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2013-03-11 21:26:55 +01:00
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*
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2019-07-11 18:50:00 +02:00
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* The switch is connected to ground and should be pulled up and sensed
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2013-03-11 21:26:55 +01:00
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* with a value of '0' when closed.
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*/
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2019-07-11 18:50:00 +02:00
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/* Pin configuration for each LPC4088 Quickstart button. This array is
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* indexed by the BUTTON_* and JOYSTICK_* definitions in board.h
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2013-02-13 02:33:37 +01:00
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*/
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2019-07-11 18:50:00 +02:00
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static const lpc17_40_pinset_t g_buttoncfg[NUM_BUTTONS] =
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2013-02-13 02:33:37 +01:00
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{
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2019-07-11 18:50:00 +02:00
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GPIO_USER1
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2013-02-13 02:33:37 +01:00
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};
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2019-07-11 18:50:00 +02:00
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#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_LPC17_40_GPIOIRQ)
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2013-02-13 02:33:37 +01:00
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/* This array provides the mapping from button ID numbers to button IRQ
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* numbers.
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*/
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2017-12-17 23:54:53 +01:00
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static const uint8_t g_buttonirq[NUM_BUTTONS] =
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2013-02-13 02:33:37 +01:00
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{
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2019-07-11 18:50:00 +02:00
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GPIO_USER1_IRQ
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2013-02-13 02:33:37 +01:00
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};
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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2014-01-24 20:50:23 +01:00
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* Name: board_button_initialize
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2013-02-13 02:33:37 +01:00
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*
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* Description:
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2019-08-13 18:08:49 +02:00
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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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2013-02-13 02:33:37 +01:00
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*
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****************************************************************************/
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2020-06-05 11:13:48 +02:00
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uint32_t board_button_initialize(void)
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2013-02-13 02:33:37 +01:00
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{
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int i;
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/* Configure the GPIO pins as interrupting inputs. */
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2017-12-17 23:54:53 +01:00
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for (i = 0; i < NUM_BUTTONS; i++)
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2013-02-13 02:33:37 +01:00
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{
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2019-07-11 18:50:00 +02:00
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lpc17_40_configgpio(g_buttoncfg[i]);
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2013-02-13 02:33:37 +01:00
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}
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2020-06-05 11:13:48 +02:00
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return NUM_BUTTONS;
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2013-02-13 02:33:37 +01:00
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}
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/****************************************************************************
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2014-01-24 20:59:24 +01:00
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* Name: board_buttons
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2013-02-13 02:33:37 +01:00
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*
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* Description:
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2017-09-16 21:48:06 +02:00
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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.
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2013-02-13 02:33:37 +01:00
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*
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2014-01-24 20:59:24 +01:00
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* board_buttons() may be called at any time to harvest the state of every
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2013-02-13 02:33:37 +01:00
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* button. The state of the buttons is returned as a bitset with one
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* bit corresponding to each button: If the bit is set, then the button
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* is pressed. See the BOARD_BUTTON_*_BIT and BOARD_JOYSTICK_*_BIT
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* definitions in board.h for the meaning of each bit.
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*
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****************************************************************************/
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2017-04-09 15:22:49 +02:00
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uint32_t board_buttons(void)
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2013-02-13 02:33:37 +01:00
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{
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2017-04-09 15:22:49 +02:00
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uint32_t ret = 0;
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2013-02-13 02:33:37 +01:00
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int i;
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/* Check that state of each key */
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2017-12-17 23:54:53 +01:00
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for (i = 0; i < NUM_BUTTONS; i++)
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2013-02-13 02:33:37 +01:00
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{
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2019-08-13 18:08:49 +02:00
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/* A LOW value means that the key is pressed. */
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2013-02-13 02:33:37 +01:00
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2019-08-13 18:08:49 +02:00
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bool released = lpc17_40_gpioread(g_buttoncfg[i]);
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2013-02-13 02:33:37 +01:00
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2019-08-13 18:08:49 +02:00
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/* Accumulate the set of depressed (not released) keys */
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2013-02-13 02:33:37 +01:00
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2019-08-13 18:08:49 +02:00
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if (!released)
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{
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2013-02-13 02:33:37 +01:00
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ret |= (1 << i);
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2019-08-13 18:08:49 +02:00
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}
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2013-02-13 02:33:37 +01:00
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}
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return ret;
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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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2017-09-16 21:48:06 +02:00
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* board_button_initialize() must be called to initialize button resources.
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* After that, board_button_irq() may be called to register button
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* interrupt handlers.
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*
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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 BOARD_BUTTON_* and BOARD_JOYSTICK_* definitions in board.h for
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* the meaning of enumeration values.
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2013-02-13 02:33:37 +01:00
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*
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2014-01-24 21:04:07 +01:00
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* Note that board_button_irq() also enables button interrupts. Button
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2013-02-13 02:33:37 +01:00
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* interrupts will remain enabled after the interrupt handler is attached.
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2019-08-13 18:08:49 +02:00
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* Interrupts may be disabled (and detached) by calling board_button_irq
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* with irqhandler equal to NULL.
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2013-02-13 02:33:37 +01:00
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*
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****************************************************************************/
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2019-07-11 18:50:00 +02:00
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#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_LPC17_40_GPIOIRQ)
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2017-03-02 21:37:22 +01:00
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int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
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2013-02-13 02:33:37 +01:00
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{
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irqstate_t flags;
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2017-03-02 21:37:22 +01:00
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int ret = -EINVAL;
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2013-02-13 02:33:37 +01:00
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int irq;
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/* Verify that the button ID is within range */
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2017-12-17 23:54:53 +01:00
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if ((unsigned)id < NUM_BUTTONS)
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2013-02-13 02:33:37 +01:00
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{
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2013-04-08 16:26:49 +02:00
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/* Get the IRQ number for the button; A value of zero indicates that
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* the button does not support the interrupt function.
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*/
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2013-02-13 02:33:37 +01:00
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2013-04-08 16:26:49 +02:00
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irq = g_buttonirq[id];
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if (irq > 0)
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{
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/* Disable interrupts until we are done */
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2013-02-13 02:33:37 +01:00
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2016-02-13 19:37:46 +01:00
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flags = enter_critical_section();
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2013-02-13 02:33:37 +01:00
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2013-04-08 16:26:49 +02:00
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/* Configure the interrupt. Either attach and enable the new
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* interrupt or disable and detach the old interrupt handler.
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*/
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2013-02-13 02:33:37 +01:00
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2013-04-08 16:26:49 +02:00
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if (irqhandler)
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{
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/* Attach then enable the new interrupt handler */
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2013-02-13 02:33:37 +01:00
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2020-01-02 17:49:34 +01:00
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irq_attach(irq, irqhandler, arg);
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2013-04-08 16:26:49 +02:00
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up_enable_irq(irq);
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}
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else
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{
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2013-08-27 17:40:19 +02:00
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/* Disable then detach the old interrupt handler */
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2013-02-13 02:33:37 +01:00
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2013-04-08 16:26:49 +02:00
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up_disable_irq(irq);
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2020-01-02 17:49:34 +01:00
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irq_detach(irq);
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2013-04-08 16:26:49 +02:00
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}
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2016-02-13 19:37:46 +01:00
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leave_critical_section(flags);
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2013-04-08 16:26:49 +02:00
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}
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2017-03-02 21:37:22 +01:00
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ret = OK;
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2013-02-13 02:33:37 +01:00
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}
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2017-03-02 21:37:22 +01:00
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return ret;
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2013-02-13 02:33:37 +01:00
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}
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#endif
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#endif /* CONFIG_ARCH_BUTTONS */
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