cd001725b7
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
198 lines
6.0 KiB
C
198 lines
6.0 KiB
C
/****************************************************************************
|
|
* boards/arm/efm32/olimex-efm32g880f128-stk/src/efm32_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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/* The Olimex board has four buttons, BUT1-4. Each is grounded and so should
|
|
* have a weak pull-up so that it will be sensed as "1" when open and "0"
|
|
* when closed.
|
|
*
|
|
* --------------------- ---------------------
|
|
* PIN CONNECTIONS
|
|
* --------------------- ---------------------
|
|
* PE0/PCNT0_S0IN/U0_TX BUT1, EXT-18
|
|
* PE1/PCNT0_S1IN/U0_RX BUT2, EXT-19
|
|
* PE2/ACMP0_O BUT3, EXT-20
|
|
* E3/ACMP1_O BUT4, EXT-21
|
|
* --------------------- ---------------------
|
|
*/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <nuttx/arch.h>
|
|
#include <nuttx/board.h>
|
|
#include <nuttx/irq.h>
|
|
|
|
#include <nuttx/irq.h>
|
|
#include <arch/board/board.h>
|
|
|
|
#include "efm32_gpio.h"
|
|
#include "efm32g880f128-stk.h"
|
|
|
|
#if CONFIG_ARCH_BUTTONS
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_EFM32_GPIO_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
|
|
static const uint8_t g_button_irqs[NUM_BUTTONS];
|
|
#endif
|
|
|
|
static const gpio_pinset_t g_button_boards[NUM_BUTTONS] =
|
|
{
|
|
GPIO_BUTTON_1, GPIO_BUTTON_2, GPIO_BUTTON_3, GPIO_BUTTON_4
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* 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 each button */
|
|
|
|
for (i = 0; i < NUM_BUTTONS; i++)
|
|
{
|
|
efm32_configgpio(g_button_boards[i]);
|
|
}
|
|
|
|
return NUM_BUTTONS;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: board_buttons
|
|
*
|
|
* Description:
|
|
* 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*
|
|
* definitions above for the meaning of each bit in the returned value.
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint32_t board_buttons(void)
|
|
{
|
|
uint32_t ret;
|
|
int i;
|
|
|
|
/* Check each button */
|
|
|
|
for (i = 0, ret = 0; i < NUM_BUTTONS; i++)
|
|
{
|
|
/* The button is closed if a low value is sensed */
|
|
|
|
if (!efm32_gpioread(g_button_boards[i]))
|
|
{
|
|
ret |= (1 << i);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: board_button_irq
|
|
*
|
|
* Description:
|
|
* This function may be called to register an interrupt handler that will
|
|
* be called when a button is depressed or released. The ID value is one
|
|
* of the BUTTON* definitions provided above.
|
|
*
|
|
* Configuration Notes:
|
|
* Configuration CONFIG_EFM32_GPIO_IRQ must be selected to enable the
|
|
* overall GPIO IRQ feature.
|
|
*
|
|
* Returned Value:
|
|
* This function should return the old interrupt handler value, but
|
|
* currently always returns NULL.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_EFM32_GPIO_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
|
|
int board_button_irq(int id, xcpt_t irqhandler, void *arg)
|
|
{
|
|
if (id >= 0 && id < NUM_BUTTONS)
|
|
{
|
|
irqstate_t flags;
|
|
|
|
/* Disable interrupts until we are done. This guarantees that the
|
|
* following operations are atomic.
|
|
*/
|
|
|
|
flags = enter_critical_section();
|
|
|
|
/* Are we attaching or detaching? */
|
|
|
|
if (irqhandler != NULL)
|
|
{
|
|
/* Configure the interrupt */
|
|
|
|
efm32_gpioirq(g_button_boards[id]);
|
|
|
|
/* Attach and enable the interrupt */
|
|
|
|
irq_attach(g_button_irqs[id], irqhandler, arg);
|
|
efm32_gpioirqenable(g_button_irqs[id]);
|
|
}
|
|
else
|
|
{
|
|
/* Disable and detach the interrupt */
|
|
|
|
efm32_gpioirqdisable(g_button_irqs[id]);
|
|
irq_detach(g_button_irqs[id]);
|
|
}
|
|
|
|
leave_critical_section(flags);
|
|
}
|
|
|
|
/* Return the old button handler (so that it can be restored) */
|
|
|
|
return OK;
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_ARCH_BUTTONS */
|