added arduino, modified build

arduino/libraries/SoftPWM/SoftPWM_timer.h

@@ -0,0 +1,83 @@
+/*
+|| @author         Paul Stoffregen (paul at pjrc dot com)
+|| @contribution   Brett Hagman <bhagman@wiring.org.co>
+|| @url            http://wiring.org.co/
+||
+|| @description
+|| | A Software PWM Library
+|| |
+|| | Simple timer abstractions.
+|| #
+||
+|| @license Please see the accompanying LICENSE.txt file for this project.
+||
+|| @name Software PWM Library support
+|| @type Library support
+|| @target Atmel AVR 8 Bit
+||
+|| @version 1.0.1
+||
+*/
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+// allow certain chips to use different timers
+#if defined(__AVR_ATmega32U4__)
+#define USE_TIMER4_HS // Teensy 2.0 lacks timer2, but has high speed timer4 :-)
+#elif defined(__arm__) && defined(TEENSYDUINO)
+#define USE_INTERVALTIMER  // Teensy 3.x has special interval timers :-)
+#else
+#define USE_TIMER1
+#endif
+
+// for each timer, these macros define how to actually use it
+#if defined(USE_TIMER1)
+#define SOFTPWM_TIMER_INTERRUPT    TIMER1_COMPA_vect
+#define SOFTPWM_TIMER_SET(val)     (TCNT1 = (val))
+#define SOFTPWM_TIMER_INIT(ocr) ({\
+    cli(); \
+    TCCR1A = 0;                             \
+    TCCR1B = (1 << WGM12);                  \
+    TCCR1B |= ((1 << CS10) | (1 << CS12));  \
+    TIMSK1 = (1 << OCIE1A);                 \
+    OCR1A = 15624;                          \
+    sei(); \
+})
+
+#elif defined(USE_TIMER2)
+#define SOFTPWM_TIMER_INTERRUPT    TIMER2_COMPA_vect
+#define SOFTPWM_TIMER_SET(val)     (TCNT2 = (val))
+#define SOFTPWM_TIMER_INIT(ocr) ({\
+  TIFR2 = (1 << TOV2);    /* clear interrupt flag */ \
+  TCCR2B = (1 << CS21);   /* start timer (ck/8 prescalar) */ \
+  TCCR2A = (1 << WGM21);  /* CTC mode */ \
+  OCR2A = (15624);          /* We want to have at least 30Hz or else it gets choppy */ \
+  TIMSK2 = (1 << OCIE2A); /* enable timer2 output compare match interrupt */ \
+})
+#elif defined(USE_TIMER4_HS)
+#define SOFTPWM_TIMER_INTERRUPT    TIMER4_COMPA_vect
+#define SOFTPWM_TIMER_SET(val)     (TCNT4 = (val))
+#define SOFTPWM_TIMER_INIT(ocr) ({\
+  TCCR4A = 0; \
+  TCCR4B = 0x04; /* CTC Mode */\
+  TCCR4C = 0; \
+  TCCR4D  = 0; \
+  TCCR4E  = 0; \
+  OCR4C  = 0; \
+  OCR4C  = (ocr); \
+  TIMSK4  = (1 << OCIE4A); \
+})
+#elif defined(USE_INTERVALTIMER)
+#define SOFTPWM_TIMER_INTERRUPT    softpwm_interval_timer
+#ifdef ISR
+#undef ISR
+#endif
+#define ISR(f) void f(void)
+#define SOFTPWM_TIMER_SET(val)
+#define SOFTPWM_TIMER_INIT(ocr) ({\
+  IntervalTimer *t = new IntervalTimer(); \
+  t->begin(softpwm_interval_timer, 1000000.0 / (float)(SOFTPWM_FREQ * 256)); \
+})
+#endif
+