/* * Authors: Brendan Le Foll * Mihai Tudor Panu * Sarah Knepper * Abhishek Malik * Copyright (c) 2014 - 2016 Intel Corporation. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "button.h" button_context button_init(int pin){ // make sure that mraa is initialized int mraa_rv; if((mraa_rv = mraa_init()) != MRAA_SUCCESS){ printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv); return NULL; } button_context dev = (button_context) malloc(sizeof(struct _button_context)); if (dev == NULL){ printf("Unable to allocate space for the sensor structure\n"); return NULL; } dev->gpio_pin = pin; dev->gpio = mraa_gpio_init(dev->gpio_pin); mraa_gpio_dir(dev->gpio, MRAA_GPIO_IN); dev->isr_installed = false; return dev; } void button_close(button_context dev){ mraa_gpio_close(dev->gpio); free(dev); } upm_result_t button_get_value(button_context dev, bool* val){ int ret = mraa_gpio_read(dev->gpio); if(ret > 0) *val = true; else *val = false; return UPM_SUCCESS; } upm_result_t button_install_isr(button_context dev, mraa_gpio_edge_t edge_level, void (*isr)(void *), void *arg){ button_uninstall_isr(dev); mraa_gpio_isr(dev->gpio, edge_level, isr, arg); dev->isr_installed = true; return UPM_SUCCESS; } upm_result_t button_uninstall_isr(button_context dev){ if(dev->isr_installed) mraa_gpio_isr_exit(dev->gpio); dev->isr_installed = false; return UPM_SUCCESS; }