HardwarePWM.h

/****
 * Sming Framework Project - Open Source framework for high efficiency native ESP8266 development.
 * Created 2015 by Skurydin Alexey
 * http://github.com/anakod/Sming
 * All files of the Sming Core are provided under the LGPL v3 license.
 *
 * HardwarePWM.h
 *
 * Original Author: https://github.com/hrsavla
 *
 * This HW_PWM library enables Sming framework user to use ESP SDK PWM API
 * Period of PWM is fixed to 1000ms / Frequency = 1khz
 * Duty at 100% = 22222. Duty at 0% = 0
 * You can use function setPeriod() to change frequency/period.
 * Calculate the Duty as per the formulae give in ESP8266 SDK
 * Duty = (Period *1000)/45
 *
 * PWM can be generated on upto 8 pins (ie All pins except pin 16)
 * Created on August 17, 2015, 2:27 PM
 *
 ****/

#ifndef _SMING_CORE_HARDWARE_PWM_H_
#define _SMING_CORE_HARDWARE_PWM_H_

#include "ESP8266EX.h"
#include "WiringFrameworkDependencies.h"

#ifdef __cplusplus
extern "C" {
#endif
#include <pwm.h>
#ifdef __cplusplus
}
#endif

#define PWM_BAD_CHANNEL 0xff 

class HardwarePWM
{
public:
    HardwarePWM(uint8* pins, uint8 no_of_pins);
    virtual ~HardwarePWM();

    bool analogWrite(uint8 pin, uint32 duty)
    {
        return setDuty(pin, duty);
    }

    bool setDutyChan(uint8 chan, uint32 duty, bool update = true);

    bool setDuty(uint8 pin, uint32 duty, bool update = true)
    {
        uint8 chan = getChannel(pin);
        return setDutyChan(chan, duty, update);
    }

    uint32 getDutyChan(uint8 chan);

    uint32 getDuty(uint8 pin)
    {
        uint8 chan = getChannel(pin);
        return getDutyChan(chan);
    }

    void setPeriod(uint32 period);

    uint32 getPeriod(void);

    uint8 getChannel(uint8 pin);

    uint32 getMaxDuty()
    {
        return maxduty;
    }

    void update();

private:
    uint8 channel_count;
    uint8 channels[PWM_CHANNEL_NUM_MAX];
    uint32 maxduty;
};

#endif /* _SMING_CORE_HARDWARE_PWM_H_ */