324 lines
9.6 KiB
C
324 lines
9.6 KiB
C
/****************************************************************************
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* boards/arm/stm32l4/stm32l4r9ai-disco/src/stm32_buttons.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/board.h>
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#include <arch/board/board.h>
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#include <nuttx/power/pm.h>
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#include "stm32l4r9ai-disco.h"
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#ifdef CONFIG_ARCH_BUTTONS
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_PM_BUTTON_ACTIVITY
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# define CONFIG_PM_BUTTON_ACTIVITY 10
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#endif
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Button Power Management */
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#ifdef CONFIG_PM
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static void button_pm_notify(struct pm_callback_s *cb, int domain,
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enum pm_state_e pmstate);
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static int button_pm_prepare(struct pm_callback_s *cb, int domain,
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enum pm_state_e pmstate);
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Pin configuration for each STM32L476 Discovery button. This array is
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* indexed by the BUTTON_* definitions in board.h
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*/
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static const uint32_t g_buttons[NUM_BUTTONS] =
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{
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GPIO_BTN_CENTER,
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GPIO_BTN_LEFT,
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GPIO_BTN_DOWN,
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GPIO_BTN_RIGHT,
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GPIO_BTN_UP
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};
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#ifdef CONFIG_PM
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static struct pm_callback_s g_buttonscb =
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{
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.notify = button_pm_notify,
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.prepare = button_pm_prepare,
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};
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: button_pm_notify
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*
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* Description:
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* Notify the driver of new power state. This callback is called after
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* all drivers have had the opportunity to prepare for the new power state.
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*
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****************************************************************************/
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#ifdef CONFIG_PM
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static void button_pm_notify(struct pm_callback_s *cb, int domain,
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enum pm_state_e pmstate)
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{
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switch (pmstate)
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{
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case(PM_NORMAL):
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{
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/* Restore normal buttons operation
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* XXX turn on any GPIO
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*/
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}
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break;
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case(PM_IDLE):
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{
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/* Entering IDLE mode - buttons
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* XXX turn on any GPIO
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*/
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}
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break;
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case(PM_STANDBY):
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{
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/* Entering STANDBY mode - Logic for PM_STANDBY goes here
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* XXX turn off any GPIO
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*/
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}
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break;
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case(PM_SLEEP):
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{
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/* Entering SLEEP mode - Logic for PM_SLEEP goes here
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* XXX turn off any GPIO
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*/
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}
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break;
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default:
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{
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/* Should not get here */
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}
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break;
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}
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}
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#endif
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/****************************************************************************
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* Name: button_handler
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*
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* Description:
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* Handle a button wake-up interrupt
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*
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****************************************************************************/
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/* XXX it's not completely clear to me if this is appropriate; on the one
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* hand, it seems to make sense that this would be the module to have the ISR
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* for the buttons. On the other hand, it will conflict with things done in
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* the buttons example, which registers it's own ISR, and warns if it sees
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* one already there. I don't know if 'buttons' is overstepping it's bounds
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* in the interest of providing a compact example, (like the I2C app directly
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* talking to the bus), or if really that should be an expected thing to do.
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*/
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#if 0
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#ifdef CONFIG_ARCH_IRQBUTTONS
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static int button_handler(int irq, void *context, void *arg)
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{
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#ifdef CONFIG_PM
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/* At this point the MCU should have already awakened. The state
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* change will be handled in the IDLE loop when the system is re-awakened
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* The button interrupt handler should be totally ignorant of the PM
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* activities and should report button activity as if nothing
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* special happened.
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*/
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pm_activity(PM_IDLE_DOMAIN, CONFIG_PM_BUTTON_ACTIVITY);
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#endif
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return OK;
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}
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#endif /* CONFIG_ARCH_IRQBUTTONS */
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#endif
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/****************************************************************************
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* Name: button_pm_prepare
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*
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* Description:
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* Request the driver to prepare for a new power state. This is a warning
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* that the system is about to enter into a new power state. The driver
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* should begin whatever operations that may be required to enter power
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* state. The driver may abort the state change mode by returning a
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* non-zero value from the callback function.
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*
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****************************************************************************/
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#ifdef CONFIG_PM
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static int button_pm_prepare(struct pm_callback_s *cb, int domain,
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enum pm_state_e pmstate)
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{
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/* No preparation to change power modes is required by the Buttons driver.
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* We always accept the state change by returning OK.
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*/
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return OK;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_button_initialize
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*
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* Description:
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* board_button_initialize() must be called to initialize button resources.
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* After that, board_buttons() may be called to collect the current state
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* of all buttons or board_button_irq() may be called to register button
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* interrupt handlers.
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*
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****************************************************************************/
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uint32_t board_button_initialize(void)
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{
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int i;
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/* Configure the GPIO pins as inputs. NOTE that EXTI interrupts are
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* configured for all pins.
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*/
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for (i = 0; i < NUM_BUTTONS; i++)
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{
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stm32l4_configgpio(g_buttons[i]);
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/* It's not clear if this is correct; I think so, but then there are
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* conflicts with the 'buttons' sample app.
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*/
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#if 0
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#ifdef CONFIG_ARCH_IRQBUTTONS
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board_button_irq(i, button_handler);
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#endif
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#endif
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}
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return NUM_BUTTONS;
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}
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/****************************************************************************
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* Name: board_buttons
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****************************************************************************/
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uint32_t board_buttons(void)
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{
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uint32_t ret = 0;
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int i;
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/* Check that state of each key */
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for (i = 0; i < NUM_BUTTONS; i++)
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{
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/* A HIGH value means that the key is pressed. */
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bool pressed = stm32l4_gpioread(g_buttons[i]);
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/* Accumulate the set of depressed (not released) keys */
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if (pressed)
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{
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ret |= (1 << i);
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}
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}
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#ifdef CONFIG_PM
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/* if the user pressed any buttons, notify power management system we are
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* active
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*/
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if (0 != ret)
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{
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pm_activity(PM_IDLE_DOMAIN, CONFIG_PM_BUTTON_ACTIVITY);
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}
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#endif
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return ret;
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}
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/****************************************************************************
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* Button support.
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*
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* Description:
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* board_button_initialize() must be called to initialize button resources.
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* After that, board_buttons() may be called to collect the current state
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* of all buttons or board_button_irq() may be called to register button
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* interrupt handlers.
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*
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* After board_button_initialize() has been called, board_buttons() may be
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* called to collect the state of all buttons. board_buttons() returns an
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* 32-bit bit set with each bit associated with a button. See the
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* BUTTON_*_BIT definitions in board.h for the meaning of each bit.
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*
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* board_button_irq() may be called to register an interrupt handler that
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* will be called when a button is depressed or released. The ID value is
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* a button enumeration value that uniquely identifies a button resource.
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* See the BUTTON_* definitions in board.h for the meaning of enumeration
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* value.
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*
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****************************************************************************/
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#ifdef CONFIG_ARCH_IRQBUTTONS
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int board_button_irq(int id, xcpt_t irqhandler, void *arg)
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{
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int ret = -EINVAL;
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/* The following should be atomic */
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if (id >= MIN_IRQBUTTON && id <= MAX_IRQBUTTON)
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{
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ret = stm32l4_gpiosetevent(g_buttons[id], true, true, true,
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irqhandler, arg);
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}
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return ret;
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}
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#endif
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#endif /* CONFIG_ARCH_BUTTONS */
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