diff options
Diffstat (limited to 'arduino/libraries/Servo/src/Servo.h')
| -rwxr-xr-x | arduino/libraries/Servo/src/Servo.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/arduino/libraries/Servo/src/Servo.h b/arduino/libraries/Servo/src/Servo.h new file mode 100755 index 0000000..1dfc1c8 --- /dev/null +++ b/arduino/libraries/Servo/src/Servo.h @@ -0,0 +1,121 @@ +/* + 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 seized as needed in groups of 12 servos - 24 servos use two + timers, 48 servos will use four. + The sequence used to sieze timers is defined in timers.h + + 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> + +/* + * Defines for 16 bit timers used with Servo library + * + * If _useTimerX is defined then TimerX is a 16 bit timer on the current board + * timer16_Sequence_t enumerates the sequence that the timers should be allocated + * _Nbr_16timers indicates how many 16 bit timers are available. + */ + +// Architecture specific include +#if defined(ARDUINO_ARCH_AVR) +#include "avr/ServoTimers.h" +#elif defined(ARDUINO_ARCH_SAM) +#include "sam/ServoTimers.h" +#elif defined(ARDUINO_ARCH_SAMD) +#include "samd/ServoTimers.h" +#elif defined(ARDUINO_ARCH_STM32F4) +#include "stm32f4/ServoTimers.h" +#elif defined(ARDUINO_ARCH_NRF52) +#include "nrf52/ServoTimers.h" +#else +#error "This library only supports boards with an AVR, SAM, SAMD, NRF52 or STM32F4 processor." +#endif + +#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 + +#define SERVOS_PER_TIMER 12 // the maximum number of servos controlled by one timer +#define MAX_SERVOS (_Nbr_16timers * SERVOS_PER_TIMER) + +#define INVALID_SERVO 255 // flag indicating an invalid servo index + +#if !defined(ARDUINO_ARCH_STM32F4) + +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; + volatile 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 + int16_t min; // minimum pulse in µs + int16_t max; // maximum pulse in µs + + HardwarePWM* pwm; +}; + +#endif +#endif |