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PWM.h
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/*
Copyright (c) 2012 Sam Knight
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
This library is built to support two of the AVR Architecture 'groups' that Arduino uses
a) ATmega48/88/168/328,
b) ATmega640/1280/1281/2560/2561
*/
#ifndef PWM_H_
#define PWM_H_
#include "avr/pgmspace.h"
#include "math.h"
#if defined(__AVR_ATmega640__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega2561__)
#include "utility/ATimerDefs.h"
#elif defined(__AVR_ATmega48__) || defined(__AVR_ATmega88__) || defined(__AVR_ATmega88P__) || defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328PB__)
#include "utility/BTimerDefs.h"
#endif
#if defined(__AVR_ATmega640__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega2561__)
// 16 bit timers
extern uint32_t GetFrequency_16(const int16_t timerOffset);
extern bool SetFrequency_16(const int16_t timerOffset, uint32_t f);
extern uint16_t GetPrescaler_16(const int16_t timerOffset);
extern void SetPrescaler_16(const int16_t timerOffset, prescaler psc);
extern void SetTop_16(const int16_t timerOffset, uint16_t top);
extern uint16_t GetTop_16(const int16_t timerOffset);
extern void Initialize_16(const int16_t timerOffset);
extern float GetResolution_16(const int16_t timerOffset);
// 8 bit timers
extern uint32_t GetFrequency_8(const int16_t timerOffset);
extern bool SetFrequency_8(const int16_t timerOffset, uint32_t f);
extern uint16_t GetPrescaler_8(const int16_t timerOffset);
extern void SetPrescaler_8(const int16_t timerOffset, prescaler psc);
extern void SetPrescalerAlt_8(const int16_t timerOffset, prescaler_alt psc);
extern void SetTop_8(const int16_t timerOffset, uint8_t top);
extern uint8_t GetTop_8(const int16_t timerOffset);
extern void Initialize_8(const int16_t timerOffset);
extern float GetResolution_8(const int16_t timerOffset);
#endif
#if defined(__AVR_ATmega48__) || defined(__AVR_ATmega88__) || defined(__AVR_ATmega88P__) || defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328PB__)
// 16 bit timers
extern uint32_t GetFrequency_16();
extern bool SetFrequency_16(uint32_t f);
extern uint16_t GetPrescaler_16();
extern void SetPrescaler_16(prescaler psc);
extern void SetTop_16(uint16_t top);
extern uint16_t GetTop_16();
extern void Initialize_16();
extern float GetResolution_16();
// 8 bit timers
extern uint32_t GetFrequency_8(const int16_t timerOffset);
extern bool SetFrequency_8(const int16_t timerOffset, uint32_t f);
extern uint16_t GetPrescaler_8(const int16_t timerOffset);
extern void SetPrescaler_8(const int16_t timerOffset, prescaler psc);
extern void SetPrescalerAlt_8(const int16_t timerOffset, prescaler_alt psc);
extern void SetTop_8(const int16_t timerOffset, uint8_t top);
extern uint8_t GetTop_8(const int16_t timerOffset);
extern void Initialize_8(const int16_t timerOffset);
extern float GetResolution_8(const int16_t timerOffset);
#endif
//common functions
extern void InitTimers();
extern void InitTimersSafe(); //doesn't init timers responsible for time keeping functions
extern void pwmWrite(uint8_t pin, uint8_t val);
extern void pwmWriteHR(uint8_t pin, uint16_t val); //accepts a 16 bit value and maps it down to the timer for maximum resolution
extern bool SetPinFrequency(int8_t pin, uint32_t frequency);
extern bool SetPinFrequencySafe(int8_t pin, uint32_t frequency); //does not set timers responsible for time keeping functions
extern float GetPinResolution(uint8_t pin); //gets the PWM resolution of a pin in base 2, 0 is returned if the pin is not connected to a timer
#endif /* PWM_H_ */