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nuttx/configs/sure-pic32mx/src/pic32mx_buttons.c

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/****************************************************************************
* configs/sure-pic32mx/src/pic32mx_buttons.c
*
* Copyright (C) 2011, 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 <debug.h>
#include <arch/board/board.h>
#include "chip.h"
#include "up_arch.h"
#include "pic32mx-internal.h"
#include "pic32mx-ioport.h"
#include "pic32mx-adc.h"
#include "sure-pic32mx.h"
#ifdef CONFIG_ARCH_BUTTONS
/****************************************************************************
* Definitions
****************************************************************************/
/* The Sure DB_DP11215 PIC32 Storage Demo Board has three buttons.
*
* SW1 (SW_UP, left arrow) RB3 Pulled high, Grounded/low when depressed
* SW2 (SW_DOWN, down/right arrow) RB2 Pulled high, Grounded/low when depressed
* SW3 (SW_OK, right arrow) RB4 Pulled high, Grounded/low when depressed
*
* The Sure DB-DP11212 PIC32 General Purpose Demo Board also has three buttons,
* but these are connected differently:
*
* SW2-1 RF0 Pulled high, Grounded/low when depressed
* SW3-1 RF1 Pulled high, Grounded/low when depressed
* SW5-1 RD6 Pulled high, Grounded/low when depressed
*
* Internal pull-ups are not required since the LEDs are pull-up externally.
* Change notification interrupts are not *automatically* enabled. Change
* notification will be enabled when pic32mx_gpioattach() is called.
*/
#ifdef CONFIG_ARCH_DBDP11215
# define GPIO_SW1 (GPIO_INPUT|GPIO_INT|GPIO_PORTB|GPIO_PIN3)
# define GPIO_SW2 (GPIO_INPUT|GPIO_INT|GPIO_PORTB|GPIO_PIN2)
# define GPIO_SW3 (GPIO_INPUT|GPIO_INT|GPIO_PORTB|GPIO_PIN4)
#else /* CONFIG_ARCH_DBDP11212 */
# define GPIO_SW1 (GPIO_INPUT|GPIO_INT|GPIO_PORTF|GPIO_PIN0)
# define GPIO_SW2 (GPIO_INPUT|GPIO_INT|GPIO_PORTF|GPIO_PIN1)
# define GPIO_SW3 (GPIO_INPUT|GPIO_INT|GPIO_PORTD|GPIO_PIN6)
#endif
/* Change notification numbers:
* RB3 -> CN5
* RB2 -> CN2
* RB4 -> CN6
*/
#define CN_SW1 5
#define CN_SW2 2
#define CN_SW3 6
/****************************************************************************
* Private Data
****************************************************************************/
/* Pin configuration for each button */
static const uint16_t g_buttonset[NUM_BUTTONS] =
{
GPIO_SW1 GPIO_SW2, GPIO_SW3
}
/* Change notification number for each button */
#ifdef CONFIG_ARCH_IRQBUTTONS
static const uint8_t g_buttoncn[NUM_BUTTONS] =
{
CN_SW1, CN_SW2, CN_SW3
}
#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 input pins */
for (i = 0; i < NUM_BUTTONS; i++)
{
pic32mx_configgpio(g_buttonset[i]);
}
/* Change AN2/AN3/AN4 to digital */
putreg32(0xffff, PIC32MX_ADC_CFG);
}
/****************************************************************************
* Name: up_buttons
****************************************************************************/
uint8_t up_buttons(void)
{
uint8_t ret = 0;
int id;
/* Configure input pins */
for (id = 0; id < NUM_BUTTONS; id++)
{
if (pic32mx_gpioread(g_buttonset[id]))
{
ret |= (1 << id);
}
}
return ret;
}
/************************************************************************************
* Button support.
*
* 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.
*
* After up_buttoninit() has been called, up_buttons() may be called to
* collect the state of all buttons. up_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.
*
* 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
* 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).
*
* Interrupts are automatically enabled when the button handler is attached and
* automatically disabled when the button handler is detached.
*
* When an interrupt occurs, it is due to a change on the GPIO input pin
* associated with the button. In that case, all attached change
* notification handlers will be called. Each handler must maintain state
* and determine if the unlying GPIO button input value changed.
*
************************************************************************************/
#ifdef CONFIG_ARCH_IRQBUTTONS
xcpt_t up_irqbutton(int id, xcpt_t irqhandler)
{
xcpt_t oldhandler = NULL;
if (id < NUM_BUTTONS)
{
oldhandler = pic32mx_gpioattach(g_buttonset[id], g_buttoncn[id], irqhandler);
if (irqbuttron)
{
pic32mx_gpioirqenable(g_buttoncn[id]);
}
}
return oldhandler;
}
#endif
#endif /* CONFIG_ARCH_BUTTONS */
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