marlin/Marlin/src/HAL/LINUX/servo_private.h

/**
 * Marlin 3D Printer Firmware
 * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */
#pragma once

/**
 * servo.h - Interrupt driven Servo library for Arduino using 16 bit timers- Version 2
 * Copyright (c) 2009 Michael Margolis.  All right reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/**
 * Based on "servo.h - Interrupt driven Servo library for Arduino using 16 bit timers -
 *           Version 2 Copyright (c) 2009 Michael Margolis.  All right reserved.
 *
 * The only modification was to update/delete macros to match the LPC176x.
 */

#include <stdint.h>

// Macros
//values in microseconds
#define MIN_PULSE_WIDTH       544     // the shortest pulse sent to a servo
#define MAX_PULSE_WIDTH      2400     // the longest pulse sent to a servo
#define DEFAULT_PULSE_WIDTH  1500     // default pulse width when servo is attached
#define REFRESH_INTERVAL    20000     // minimum time to refresh servos in microseconds

#define MAX_SERVOS             4

#define INVALID_SERVO         255     // flag indicating an invalid servo index


// Types

typedef struct {
  uint8_t nbr        : 8 ;            // a pin number from 0 to 254 (255 signals invalid pin)
  uint8_t isActive   : 1 ;            // true if this channel is enabled, pin not pulsed if false
} ServoPin_t;

typedef struct {
  ServoPin_t Pin;
  unsigned int pulse_width;           // pulse width in microseconds
} ServoInfo_t;

// Global variables

extern uint8_t ServoCount;
extern ServoInfo_t servo_info[MAX_SERVOS];