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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4243 7fd9a85b-ad96-42d3-883c-3090e2eb8679sbg
patacongo
13 years ago
5 changed files with 307 additions and 22 deletions
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/****************************************************************************
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* configs/olimex-lpc1766stk/src/up_buttons.c |
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* |
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* Copyright (C) 2011 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 <nuttx/irq.h> |
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#include <arch/board/board.h> |
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#include "lpc1766stk_internal.h" |
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#ifdef CONFIG_ARCH_BUTTONS |
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/****************************************************************************
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* 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 uint16_t g_buttoncfg[BOARD_NUM_BUTTONS] = |
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{ |
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LPC1766STK_BUT1, LPC1766STK_BUT2, LPC1766STK_WAKEUP, LPC1766STK_CENTER, |
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LPC1766STK_UP, LPC1766STK_DOWN, LPC1766STK_LEFT, LPC1766STK_RIGHT |
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}; |
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/* This array defines all of the interupt handlers current attached to
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* button events. |
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*/ |
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#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_GPIO_IRQ) |
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static xcpt_t g_buttonisr[BOARD_NUM_BUTTONS]; |
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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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static uint8_t g_buttonirq[BOARD_NUM_BUTTONS] = |
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{ |
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LPC1766STK_BUT1_IRQ, LPC1766STK_BUT2_IRQ, LPC1766STK_WAKEUP_IRQ, |
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LPC1766STK_CENTER_IRQ, LPC1766STK_UP_IRQ, LPC1766STK_DOWN_IRQ, |
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LPC1766STK_LEFT_IRQ, LPC1766STK_RIGHT_IRQ |
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}; |
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#endif |
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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: up_buttoninit |
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* |
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* Description: |
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* up_buttoninit() must be called to initialize button resources. After |
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* that, up_buttons() may be called to collect the current state of all |
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* buttons or up_irqbutton() may be called to register button interrupt |
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* handlers. |
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* |
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****************************************************************************/ |
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void up_buttoninit(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 < BOARD_NUM_BUTTONS; i++) |
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{ |
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lpc17_configgpio(g_buttoncfg[i]); |
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} |
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} |
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/****************************************************************************
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* Name: up_buttons |
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* |
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* Description: |
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* up_buttons() may be called at any time to harvest the state of every |
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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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uint8_t up_buttons(void) |
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{ |
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uint8_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 < BOARD_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 = lpc17_gpioread(g_buttoncfg[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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* Button support. |
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* |
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* Description: |
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* up_buttoninit() must be called to initialize button resources. After |
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* that, up_buttons() may be called to collect the current state of all |
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* buttons or up_irqbutton() may be called to register button interrupt |
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* handlers. |
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* |
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* up_irqbutton() 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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* BOARD_BUTTON_* and BOARD_JOYSTICK_* definitions in board.h for the meaning |
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* of enumeration values. The previous interrupt handler address is returned |
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* (so that it may restored, if so desired). |
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* |
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************************************************************************************/ |
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#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_GPIO_IRQ) |
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xcpt_t up_irqbutton(int id, xcpt_t irqhandler) |
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{ |
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xcpt_t oldhandler = NULL; |
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irqstate_t flags; |
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/* Verify that the button ID is within range */ |
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if ((unsigned)id < BOARD_NUM_BUTTONS) |
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{ |
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/* Return the current button handler and set the new interrupt handler */ |
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oldhandler = g_buttonisr[id]; |
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g_buttonisr = irqhandler; |
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/* Disable interrupts until we are done */ |
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flags = irqsave(); |
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/* Configure the interrupt */ |
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(void)irq_attach(g_buttonirq[id], irqhandler); |
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up_enable_irq(g_buttonirq[id]); |
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irqrestore(flags); |
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} |
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return oldhandler; |
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} |
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#endif |
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#endif /* CONFIG_ARCH_BUTTONS */ |
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