You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
4.2 KiB
C
92 lines
4.2 KiB
C
15 years ago
|
/*
|
||
|
|
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
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
|
||
|
|
A servo is activated by creating an instance of the Servo class passing the desired pin to the attach() method.
|
||
|
|
The servos are pulsed in the background using the value most recently written using the write() method
|
||
|
|
|
||
|
|
Note that analogWrite of PWM on pins associated with the timer are disabled when the first servo is attached.
|
||
|
|
Timers are siezed as needed in groups of 12 servos - 24 servos use two timers, 48 servos will use four.
|
||
|
|
|
||
|
|
The methods are:
|
||
|
|
|
||
|
|
Servo - Class for manipulating servo motors connected to Arduino pins.
|
||
|
|
|
||
|
|
attach(pin ) - Attaches a servo motor to an i/o pin.
|
||
|
|
attach(pin, min, max ) - Attaches to a pin setting min and max values in microseconds
|
||
|
|
default min is 544, max is 2400
|
||
|
|
|
||
|
|
write() - Sets the servo angle in degrees. (invalid angle that is valid as pulse in microseconds is treated as microseconds)
|
||
|
|
writeMicroseconds() - Sets the servo pulse width in microseconds
|
||
|
|
read() - Gets the last written servo pulse width as an angle between 0 and 180.
|
||
|
|
readMicroseconds() - Gets the last written servo pulse width in microseconds. (was read_us() in first release)
|
||
|
|
attached() - Returns true if there is a servo attached.
|
||
|
|
detach() - Stops an attached servos from pulsing its i/o pin.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef Servo_h
|
||
|
|
#define Servo_h
|
||
|
|
|
||
|
|
#include <inttypes.h>
|
||
|
|
|
||
|
|
#define Servo_VERSION 2 // software version of this library
|
||
|
|
|
||
|
|
#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 // minumim time to refresh servos in microseconds
|
||
|
|
|
||
|
|
#if defined(__AVR_ATmega1280__)
|
||
|
|
#define MAX_SERVOS 48 // the maximum number of servos (valid range is from 1 to 48)
|
||
|
|
#else
|
||
|
|
#define MAX_SERVOS 12 // this library supports up to 12 on a standard Arduino
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define INVALID_SERVO 255 // flag indicating an invalid servo index
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
uint8_t nbr :6 ; // a pin number from 0 to 63
|
||
|
|
uint8_t isActive :1 ; // true if this channel is enabled, pin not pulsed if false
|
||
|
|
} ServoPin_t ;
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
ServoPin_t Pin;
|
||
|
|
unsigned int ticks;
|
||
|
|
} servo_t;
|
||
|
|
|
||
|
|
class Servo
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
Servo();
|
||
|
|
uint8_t attach(int pin); // attach the given pin to the next free channel, sets pinMode, returns channel number or 0 if failure
|
||
|
|
uint8_t attach(int pin, int min, int max); // as above but also sets min and max values for writes.
|
||
|
|
void detach();
|
||
|
|
void write(int value); // if value is < 200 its treated as an angle, otherwise as pulse width in microseconds
|
||
|
|
void writeMicroseconds(int value); // Write pulse width in microseconds
|
||
|
|
int read(); // returns current pulse width as an angle between 0 and 180 degrees
|
||
|
|
int readMicroseconds(); // returns current pulse width in microseconds for this servo (was read_us() in first release)
|
||
|
|
bool attached(); // return true if this servo is attached, otherwise false
|
||
|
|
private:
|
||
|
|
uint8_t servoIndex; // index into the channel data for this servo
|
||
|
|
int8_t min; // minimum is this value times 4 added to MIN_PULSE_WIDTH
|
||
|
|
int8_t max; // maximum is this value times 4 added to MAX_PULSE_WIDTH
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|