upm/src/button/button.c
Abhishek Malik fde727b601 Button: Adding C sources and C examples
This commit adds C sources and examples for the button sensor.

Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>
2016-11-08 13:38:52 -08:00

87 lines
2.7 KiB
C

/*
* Authors: Brendan Le Foll <brendan.le.foll@intel.com>
* Mihai Tudor Panu <mihai.tudor.panu@intel.com>
* Sarah Knepper <sarah.knepper@intel.com>
* Abhishek Malik <abhishek.malik@intel.com>
* 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;
}