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arduino-cli/libraries/yfrobot/TimerOne.h

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+/*
+ *  Interrupt and PWM utilities for 16 bit Timer1 on ATmega168/328
+ *  Original code by Jesse Tane for http://labs.ideo.com August 2008
+ *  Modified March 2009 by Jérôme Despatis and Jesse Tane for ATmega328 support
+ *  Modified June 2009 by Michael Polli and Jesse Tane to fix a bug in setPeriod() which caused the timer to stop
+ *  Modified June 2011 by Lex Talionis to add a function to read the timer
+ *  Modified Oct 2011 by Andrew Richards to avoid certain problems:
+ *  - Add (long) assignments and casts to TimerOne::read() to ensure calculations involving tmp, ICR1 and TCNT1 aren't truncated
+ *  - Ensure 16 bit registers accesses are atomic - run with interrupts disabled when accessing
+ *  - Remove global enable of interrupts (sei())- could be running within an interrupt routine)
+ *  - Disable interrupts whilst TCTN1 == 0.  Datasheet vague on this, but experiment shows that overflow interrupt 
+ *    flag gets set whilst TCNT1 == 0, resulting in a phantom interrupt.  Could just set to 1, but gets inaccurate
+ *    at very short durations
+ *  - startBottom() added to start counter at 0 and handle all interrupt enabling.
+ *  - start() amended to enable interrupts
+ *  - restart() amended to point at startBottom()
+ * Modiied 7:26 PM Sunday, October 09, 2011 by Lex Talionis
+ *  - renamed start() to resume() to reflect it's actual role
+ *  - renamed startBottom() to start(). This breaks some old code that expects start to continue counting where it left off
+ *
+ *  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 <http://www.gnu.org/licenses/>.
+ *
+ *  See Google Code project http://code.google.com/p/arduino-timerone/ for latest
+ */
+#ifndef TIMERONE_h
+#define TIMERONE_h
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#define RESOLUTION 65536    // Timer1 is 16 bit
+
+class TimerOne
+{
+  public:
+  
+    // properties
+    unsigned int pwmPeriod;
+    unsigned char clockSelectBits;
+	char oldSREG;					// To hold Status Register while ints disabled
+
+    // methods
+    void initialize(long microseconds=1000000);
+    void start();
+    void stop();
+    void restart();
+	void resume();
+	unsigned long read();
+    void pwm(char pin, int duty, long microseconds=-1);
+    void disablePwm(char pin);
+    void attachInterrupt(void (*isr)(), long microseconds=-1);
+    void detachInterrupt();
+    void setPeriod(long microseconds);
+    void setPwmDuty(char pin, int duty);
+    void (*isrCallback)();
+};
+
+extern TimerOne Timer1;
+#endif