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/****************************************************************************
* configs/zkit-arm-1769/src/board_buttons.c
* arch/arm/src/board/board_buttons.c
*
* Copyright (C) 2011 Zilogic Systems. All rights reserved.
* Author: Kannan <code@zilogic.com>
*
* Based on configs/stm3210e-eval/src/board_buttons.c
*
* Copyright (C) 2009, 2011 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 <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <arch/irq.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "up_internal.h"
#include "lpc17_gpio.h"
#include "zkitarm_internal.h"
#ifdef CONFIG_ARCH_BUTTONS
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* Pin configuration for each zkit-arm-1769 button. This array is indexed by
* BOARD_NUM_BUTTONS in board.h
*/
static const uint16_t g_buttons[BOARD_NUM_BUTTONS] =
{
ZKITARM_KEY1, ZKITARM_KEY2, ZKITARM_KEY3, ZKITARM_KEY4, ZKITARM_KEY5
};
/* Old KEY5 interrupt handler */
static xcpt_t g_oldhandler;
/****************************************************************************
* 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. NOTE that EXTI interrupts are
* configured for some pins but NOT used in this file
*/
for (i = 0; i < BOARD_NUM_BUTTONS; i++)
{
lpc17_configgpio(g_buttons[i]);
}
}
/****************************************************************************
* Name: board_buttons
****************************************************************************/
uint8_t board_buttons(void)
{
uint8_t ret = 0;
bool released;
int i;
/* Check that state of each key */
for (i = 0; i < BOARD_NUM_BUTTONS; i++)
{
released = lpc17_gpioread(g_buttons[i]);
/* Accumulate set of depressed keys */
if (!released)
{
ret |= (1 << i);
}
}
return ret;
}
/************************************************************************************
* Button support.
*
* 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.
*
* After board_button_initialize() has been called, board_buttons() may be called to
* collect the state of all buttons. board_buttons() returns an 8-bit bit set
* with each bit associated with a button. See the BUTTON_*_BIT and JOYSTICK_*_BIT
* definitions in board.h for the meaning of each bit.
*
* board_button_irq() 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
* BUTTON_* and JOYSTICK_* definitions in board.h for the meaning of enumeration
* value. The previous interrupt handler address is returned (so that it may
* restored, if so desired).
*
************************************************************************************/
#if defined CONFIG_ARCH_IRQBUTTONS && CONFIG_GPIO_IRQ
xcpt_t board_button_irq(int id, xcpt_t irqhandler)
{
xcpt_t rethandler = NULL;
irqstate_t flags;
int ret;
/* Interrupts are supported on KEY5 only */
if (id == BOARD_BUTTON_5)
{
/* Return the previous value of the interrupt handler */
flags = irqsave();
rethandler = g_oldhandler;
g_oldhandler = irqhandler;
/* Attach or detach the interrupt handler for KEY5. */
if (irqhandler)
{
/* Configure KEY5 as an interrupting input */
lpc17_configgpio(ZKITARM_INT_KEY5);
/* Attach the new interrupt handler and enable the interrupt */
ret = irq_attach(ZKITARM_KEY5_IRQ, irqhandler);
if (ret == OK)
{
up_enable_irq(ZKITARM_KEY5_IRQ);
}
}
else
{
/* Disable the interrupt and detach the handler */
up_disable_irq(ZKITARM_KEY5_IRQ);
(void)irq_detach(ZKITARM_KEY5_IRQ);
/* Configure KEY5 as a non-interrupting input */
lpc17_configgpio(ZKITARM_KEY5);
}
irqrestore(flags);
}
return rethandler;
}
#endif
#endif /* CONFIG_ARCH_BUTTONS */
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