examples/all-clusters-app/p6/src/ButtonHandler.cpp

/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *    Copyright (c) 2019 Google LLC.
 *    Copyright 2021, Cypress Semiconductor Corporation (an Infineon company)
 *    All rights reserved.
 *
 *    Licensed 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.
 */

#include "ButtonHandler.h"
#include "AppConfig.h"
#include "AppTask.h"

namespace {

TimerHandle_t buttonTimer; // FreeRTOS timers used for debouncing buttons

} // namespace

void ButtonHandler::Init(void)
{
    GpioInit();

    buttonTimer = xTimerCreate("BtnTmr",                            // Just a text name, not used by the RTOS kernel
                               APP_BUTTON_DEBOUNCE_PERIOD_MS,       // timer period
                               false,                               // no timer reload (==one-shot)
                               (void *) (int) APP_LIGHT_BUTTON_IDX, // init timer id = button index
                               TimerCallback                        // timer callback handler (all buttons use
                                                                    // the same timer cn function)
    );
}

void ButtonHandler::GpioInit(void)
{
    cy_rslt_t result = CY_RSLT_SUCCESS;
    // Set up button GPIOs to input with pullups.
    result = cyhal_gpio_init(APP_LIGHT_BUTTON, CYHAL_GPIO_DIR_INPUT, CYHAL_GPIO_DRIVE_PULLUP, CYBSP_BTN_OFF);
    if (result != CY_RSLT_SUCCESS)
    {
        printf(" cyhal_gpio_init failed for APP_LIGHT_BUTTON\r\n");
    }

    /* Configure GPIO interrupt. */
    static cyhal_gpio_callback_data_t light_button_cbdata;
    light_button_cbdata.callback     = light_button_callback;
    light_button_cbdata.callback_arg = NULL;
    cyhal_gpio_register_callback(APP_LIGHT_BUTTON, &light_button_cbdata);
    cyhal_gpio_enable_event(APP_LIGHT_BUTTON, CYHAL_GPIO_IRQ_FALL, GPIO_INTERRUPT_PRIORITY, true);
}

void ButtonHandler::light_button_callback(void * handler_arg, cyhal_gpio_event_t event)
{
    portBASE_TYPE taskWoken = pdFALSE;
    xTimerStartFromISR(buttonTimer, &taskWoken);
}

void ButtonHandler::TimerCallback(TimerHandle_t xTimer)
{
    // Get the button index of the expired timer and call button event helper.
    uint32_t timerId;
    uint8_t buttonevent = 0;
    timerId             = (uint32_t) pvTimerGetTimerID(xTimer);

    switch (timerId)
    {
    case APP_LIGHT_BUTTON_IDX:
        buttonevent = cyhal_gpio_read(APP_LIGHT_BUTTON);
        break;

    default:
        P6_LOG("Unhandled TimerID: %d", timerId);
        break;
    }

    GetAppTask().ButtonEventHandler(timerId, (buttonevent) ? APP_BUTTON_PRESSED : APP_BUTTON_RELEASED);
}