nuttx/boards/arm/stm32/olimex-stm32-p407/src/stm32_buttons.c

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/****************************************************************************
* boards/arm/stm32/olimex-stm32-p407/src/stm32_buttons.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <errno.h>
#include <nuttx/arch.h>
#include <nuttx/board.h>
#include <arch/board/board.h>
2017-02-28 15:31:57 +01:00
#include "stm32_gpio.h"
#include "olimex-stm32-p407.h"
#ifdef CONFIG_ARCH_BUTTONS
/****************************************************************************
* Private Data
****************************************************************************/
/* Pin configuration for each STM32F4 Discovery button. This array is indexed
* by the BUTTON_* definitions in board.h
*/
static const uint32_t g_buttons[NUM_BUTTONS] =
{
GPIO_BTN_TAMPER,
GPIO_BTN_WKUP,
/* The Joystick is treated like the other buttons unless
* CONFIG_INPUT_DJOYSTICK is defined, then it is assumed that they should
* be used by the discrete joystick driver.
*/
#ifndef CONFIG_INPUT_DJOYSTICK
GPIO_JOY_RIGHT,
GPIO_JOY_UP,
GPIO_JOY_LEFT,
GPIO_JOY_DOWN,
GPIO_JOY_CENTER
#endif
};
/****************************************************************************
* 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.
*
****************************************************************************/
uint32_t board_button_initialize(void)
{
int i;
/* Configure the GPIO pins as inputs. NOTE that EXTI interrupts are
* configured for all pins.
*/
for (i = 0; i < NUM_BUTTONS; i++)
{
stm32_configgpio(g_buttons[i]);
}
return NUM_BUTTONS;
}
/****************************************************************************
* Name: board_buttons
****************************************************************************/
uint32_t board_buttons(void)
{
uint32_t ret = 0;
/* Check that state of each key */
if (!stm32_gpioread(g_buttons[BUTTON_TAMPER]))
{
ret |= BUTTON_TAMPER_BIT;
}
if (stm32_gpioread(g_buttons[BUTTON_WKUP]))
{
ret |= BUTTON_WKUP_BIT;
}
#ifndef CONFIG_INPUT_DJOYSTICK
if (stm32_gpioread(g_buttons[JOYSTICK_RIGHT]))
{
ret |= JOYSTICK_RIGHT_BIT;
}
if (stm32_gpioread(g_buttons[JOYSTICK_UP]))
{
ret |= JOYSTICK_UP_BIT;
}
if (stm32_gpioread(g_buttons[JOYSTICK_LEFT]))
{
ret |= JOYSTICK_LEFT_BIT;
}
if (stm32_gpioread(g_buttons[JOYSTICK_DOWN]))
{
ret |= JOYSTICK_DOWN_BIT;
}
if (stm32_gpioread(g_buttons[JOYSTICK_CENTER]))
{
ret |= JOYSTICK_CENTER_BIT;
}
#endif
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
* 32-bit bit set with each bit associated with a button. See the
* BUTTON_*_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_* definitions in board.h for the meaning of enumeration
* value.
*
****************************************************************************/
#ifdef CONFIG_ARCH_IRQBUTTONS
int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
{
int ret = -EINVAL;
/* The following should be atomic */
if (id >= MIN_IRQBUTTON && id <= MAX_IRQBUTTON)
{
ret = stm32_gpiosetevent(g_buttons[id], true, true, true,
irqhandler, arg);
}
return ret;
}
#endif
#endif /* CONFIG_ARCH_BUTTONS */