small tool for controlling digital RF step atteunators attached via linux GPIOs
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/* GPIO handler routines */
/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* Author: Philipp Maier
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#define MAX_GPIOS 16
/* Struct holding the GPIO file descriptors and
meta information about the GPIO itsself */
struct gpio_descr {
unsigned int gpios[MAX_GPIOS];
unsigned int gpios_len;
FILE *fd_direction[MAX_GPIOS];
FILE *fd_value[MAX_GPIOS];
};
/* Open sysfs endpoints and initalize GPIOs */
struct gpio_descr *gpio_open(void *ctx, unsigned int *gpios,
unsigned int gpios_len);
/* Close sysfs endpoints and unintialize GPIOs */
void gpio_close(struct gpio_descr *gd);
/* Set GPIO pin status */
void gpio_set(struct gpio_descr *gd, unsigned int gpio, unsigned int state);