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nuttx/configs/open1788/src/lpc17_buttons.c

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/****************************************************************************
* configs/open1788/src/lpc17_buttons.c
*
* Copyright (C) 2013 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 <stdbool.h>
#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <arch/board/board.h>
#include "lpc17_gpio.h"
#include "open1788.h"
#ifdef CONFIG_ARCH_BUTTONS
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* The Open1788 supports several buttons. All will read "1" when open and "0"
* when closed
*
* USER1 -- Connected to P4[26]
* USER2 -- Connected to P2[22]
* USER3 -- Connected to P0[10]
*
* And a Joystick
*
* JOY_A -- Connected to P2[25]
* JOY_B -- Connected to P2[26]
* JOY_C -- Connected to P2[23]
* JOY_D -- Connected to P2[19]
* JOY_CTR -- Connected to P0[14]
*
* The switches are all connected to ground and should be pulled up and sensed
* with a value of '0' when closed.
*/
/* Pin configuration for each Open1788 button. This array is indexed by
* the BUTTON_* and JOYSTICK_* definitions in board.h
*/
static const lpc17_pinset_t g_buttoncfg[BOARD_NUM_BUTTONS] =
{
GPIO_USER1, GPIO_USER2, GPIO_USER3, GPIO_JOY_A,
GPIO_JOY_B, GPIO_JOY_C, GPIO_JOY_D, GPIO_JOY_CTR
};
/* This array defines all of the interupt handlers current attached to
* button events.
*/
#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_GPIO_IRQ)
static xcpt_t g_buttonisr[BOARD_NUM_BUTTONS];
/* This array provides the mapping from button ID numbers to button IRQ
* numbers.
*/
static uint8_t g_buttonirq[BOARD_NUM_BUTTONS] =
{
0, GPIO_USER2_IRQ, GPIO_USER3_IRQ, GPIO_JOY_A_IRQ,
GPIO_JOY_B_IRQ, GPIO_JOY_C_IRQ, GPIO_JOY_D_IRQ, GPIO_JOY_CTR_IRQ
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_buttoninit
*
* Description:
* up_buttoninit() must be called to initialize button resources. After
* that, up_buttons() may be called to collect the current state of all
* buttons or up_irqbutton() may be called to register button interrupt
* handlers.
*
****************************************************************************/
void up_buttoninit(void)
{
int i;
/* Configure the GPIO pins as interrupting inputs. */
for (i = 0; i < BOARD_NUM_BUTTONS; i++)
{
lpc17_configgpio(g_buttoncfg[i]);
}
}
/****************************************************************************
* Name: up_buttons
*
* Description:
* up_buttoninit() must be called to initialize button resources. After
* that, up_buttons() may be called to collect the current state of all
* buttons.
*
* up_buttons() may be called at any time to harvest the state of every
* button. The state of the buttons is returned as a bitset with one
* bit corresponding to each button: If the bit is set, then the button
* is pressed. See the BOARD_BUTTON_*_BIT and BOARD_JOYSTICK_*_BIT
* definitions in board.h for the meaning of each bit.
*
****************************************************************************/
uint8_t up_buttons(void)
{
uint8_t ret = 0;
int i;
/* Check that state of each key */
for (i = 0; i < BOARD_NUM_BUTTONS; i++)
{
/* A LOW value means that the key is pressed. */
bool released = lpc17_gpioread(g_buttoncfg[i]);
/* Accumulate the set of depressed (not released) keys */
if (!released)
{
ret |= (1 << i);
}
}
return ret;
}
/****************************************************************************
* Button support.
*
* Description:
* up_buttoninit() must be called to initialize button resources. After
* that, up_irqbutton() may be called to register button interrupt handlers.
*
* up_irqbutton() 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
* BOARD_BUTTON_* and BOARD_JOYSTICK_* definitions in board.h for the meaning
* of enumeration values. The previous interrupt handler address is returned
* (so that it may restored, if so desired).
*
* Note that up_irqbutton() also enables button interrupts. Button
* interrupts will remain enabled after the interrupt handler is attached.
* Interrupts may be disabled (and detached) by calling up_irqbutton with
* irqhandler equal to NULL.
*
****************************************************************************/
#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_GPIO_IRQ)
xcpt_t up_irqbutton(int id, xcpt_t irqhandler)
{
xcpt_t oldhandler = NULL;
irqstate_t flags;
int irq;
/* Verify that the button ID is within range */
if ((unsigned)id < BOARD_NUM_BUTTONS)
{
/* Get the IRQ number for the button; A value of zero indicates that
* the button does not support the interrupt function.
*/
irq = g_buttonirq[id];
if (irq > 0)
{
/* Disable interrupts until we are done */
flags = irqsave();
/* Return the current button handler and set the new interrupt handler */
oldhandler = g_buttonisr[id];
g_buttonisr[id] = irqhandler;
/* Configure the interrupt. Either attach and enable the new
* interrupt or disable and detach the old interrupt handler.
*/
if (irqhandler)
{
/* Attach then enable the new interrupt handler */
(void)irq_attach(irq, irqhandler);
up_enable_irq(irq);
}
else
{
/* Disable then detach the old interrupt handler */
up_disable_irq(irq);
(void)irq_detach(irq);
}
irqrestore(flags);
}
}
return oldhandler;
}
#endif
#endif /* CONFIG_ARCH_BUTTONS */
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