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Incorporating updates to the Servo library by Michael Margolis.

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This commit is contained in:
David A. Mellis
2010-01-08 02:44:08 +00:00
parent c450e695ab
commit e1bd1e6d5b
2 changed files with 147 additions and 43 deletions
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47
libraries/Servo/Servo.h
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@ -23,7 +23,8 @@
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.
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:
@ -46,6 +47,43 @@
#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 curent board
* timer16_Sequence_t enumerates the sequence that the timers should be allocated
* _Nbr_16timers indicates how many 16 bit timers are available.
*
*/
// Say which 16 bit timers can be used and in what order
#if defined(__AVR_ATmega1280__)
#define _useTimer5
#define _useTimer1
#define _useTimer3
#define _useTimer4
typedef enum { _timer5, _timer1, _timer3, _timer4, _Nbr_16timers } timer16_Sequence_t ;
#elif defined(__AVR_ATmega32U4__)
#define _useTimer3
#define _useTimer1
typedef enum { _timer3, _timer1, _Nbr_16timers } timer16_Sequence_t ;
#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
#define _useTimer3
#define _useTimer1
typedef enum { _timer3, _timer1, _Nbr_16timers } timer16_Sequence_t ;
#elif defined(__AVR_ATmega128__) ||defined(__AVR_ATmega1281__)||defined(__AVR_ATmega2561__)
#define _useTimer3
#define _useTimer1
typedef enum { _timer3, _timer1, _Nbr_16timers } timer16_Sequence_t ;
#else // everything else
#define _useTimer1
typedef enum { _timer1, _Nbr_16timers } timer16_Sequence_t ;
#endif
#define Servo_VERSION 2 // software version of this library
#define MIN_PULSE_WIDTH 544 // the shortest pulse sent to a servo
@ -53,11 +91,8 @@
#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 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