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fde727b601
This commit adds C sources and examples for the button sensor. Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/*
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* Authors: Brendan Le Foll <brendan.le.foll@intel.com>
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* Mihai Tudor Panu <mihai.tudor.panu@intel.com>
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* Sarah Knepper <sarah.knepper@intel.com>
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* Abhishek Malik <abhishek.malik@intel.com>
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* Copyright (c) 2014 - 2016 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "button.h"
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button_context button_init(int pin){
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// make sure that mraa is initialized
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int mraa_rv;
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if((mraa_rv = mraa_init()) != MRAA_SUCCESS){
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printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv);
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return NULL;
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}
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button_context dev = (button_context) malloc(sizeof(struct _button_context));
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if (dev == NULL){
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printf("Unable to allocate space for the sensor structure\n");
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return NULL;
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}
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dev->gpio_pin = pin;
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dev->gpio = mraa_gpio_init(dev->gpio_pin);
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mraa_gpio_dir(dev->gpio, MRAA_GPIO_IN);
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dev->isr_installed = false;
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return dev;
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}
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void button_close(button_context dev){
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mraa_gpio_close(dev->gpio);
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free(dev);
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}
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upm_result_t button_get_value(button_context dev, bool* val){
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int ret = mraa_gpio_read(dev->gpio);
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if(ret > 0)
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*val = true;
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else
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*val = false;
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return UPM_SUCCESS;
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}
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upm_result_t button_install_isr(button_context dev, mraa_gpio_edge_t edge_level, void (*isr)(void *), void *arg){
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button_uninstall_isr(dev);
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mraa_gpio_isr(dev->gpio, edge_level, isr, arg);
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dev->isr_installed = true;
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return UPM_SUCCESS;
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}
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upm_result_t button_uninstall_isr(button_context dev){
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if(dev->isr_installed)
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mraa_gpio_isr_exit(dev->gpio);
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dev->isr_installed = false;
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return UPM_SUCCESS;
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}
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