PWFusion_AS3935_I2C.cpp

/***************************************************************************
* File Name: PWFusion_AS3935_I2C.h
* Processor/Platform: Arduino Uno R3 (tested)
* Development Environment: Arduino 1.0.5
*
* Designed for use with with Playing With Fusion AS3935 Lightning Sensor
* Breakout: SEN-39001-R01. 
*
*   SEN-39001 (universal applications)
*   ---> http://www.playingwithfusion.com/productview.php?pdid=22
*
* Copyright © 2015 Playing With Fusion, Inc.
* SOFTWARE LICENSE AGREEMENT: This code is released under the MIT License.
*
* 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.
* **************************************************************************
* REVISION HISTORY:
* Author		Date		Comments
* J. Steinlage	2015Jul20	Original version
* J. Steinlage  2016Jul05   Fixed data write issue - now writing 'NewRegData'
*							  based on feedback from J Shuhy and A Jahnke
* 
* Playing With Fusion, Inc. invests time and resources developing open-source
* code. Please support Playing With Fusion and continued open-source 
* development by buying products from Playing With Fusion!
*
* **************************************************************************
* ADDITIONAL NOTES:
* This file contains functions to interface with the AS3935 Franklin 
* Lightning Sensor manufactured by AMS. Originally designed for application
* on the Arduino Uno platform.
**************************************************************************/
#include "PWFusion_AS3935_I2c.h"

PWF_AS3935_I2C::PWF_AS3935_I2C(uint8_t IRQx, uint8_t SIx, uint8_t DEVADDx)
{
	_devadd = DEVADDx;
	_si  = SIx;
	_irq = IRQx;
	
	// initalize the chip select pins
	pinMode(_si, OUTPUT);
	pinMode(_irq, INPUT);
	
	// set output pin initical condition
	digitalWrite(_si, HIGH);		// set pin high for I2C mode

}

uint8_t PWF_AS3935_I2C::_sing_reg_read(uint8_t RegAdd)
{
	//        I2C address      Register address   num bytes
	I2c.read((uint8_t)_devadd, (uint8_t)RegAdd, (uint8_t)0x01);	// Use I2C library to read register
	uint8_t RegData = I2c.receive();							// receive the I2C data
	return RegData;
}

void PWF_AS3935_I2C::_sing_reg_write(uint8_t RegAdd, uint8_t DataMask, uint8_t RegData)
{
	// start by reading original register data (only modifying what we need to)
	uint8_t OrigRegData = _sing_reg_read(RegAdd);
	
	// calculate new register data... 'delete' old targeted data, replace with new data
	// note: 'DataMask' must be bits targeted for replacement
	// add'l note: this function does NOT shift values into the proper place... they need to be there already
	uint8_t NewRegData = ((OrigRegData & ~DataMask) | (RegData & DataMask));

	// finally, write the data to the register
	I2c.write(_devadd, RegAdd, NewRegData);
	Serial.print("wrt: ");
	Serial.print(NewRegData,HEX);
	Serial.print(" Act: ");
	Serial.println(_sing_reg_read(RegAdd),HEX);
}

void PWF_AS3935_I2C::AS3935_DefInit()
{
	_AS3935_Reset();			// reset registers to default
}

void PWF_AS3935_I2C::_AS3935_Reset()
{
	// run PRESET_DEFAULT Direct Command to set all registers in default state
	I2c.write(_devadd, (uint8_t)0x3C, (uint8_t)0x96);
	delay(2);					// wait 2ms to complete
}

void PWF_AS3935_I2C::_CalRCO()
{
	// run ALIB_RCO Direct Command to cal internal RCO
	I2c.write(_devadd, (uint8_t)0x3D, (uint8_t)0x96);
	delay(2);					// wait 2ms to complete
}

void PWF_AS3935_I2C::AS3935_PowerUp(void)
{
	// power-up sequence based on datasheet, pg 23/27
	// register 0x00, PWD bit: 0 (clears PWD)
	_sing_reg_write(0x00, 0x01, 0x00);
	_CalRCO();							// run RCO cal cmd
	_sing_reg_write(0x08, 0x20, 0x20);	// set DISP_SRCO to 1
	delay(2);
	_sing_reg_write(0x08, 0x20, 0x00);	// set DISP_SRCO to 0
}

void PWF_AS3935_I2C::AS3935_PowerDown(void)
{
	// register 0x00, PWD bit: 0 (sets PWD)
	_sing_reg_write(0x00, 0x01, 0x01);
	Serial.println("AS3935 powered down");
}

void PWF_AS3935_I2C::AS3935_DisturberEn(void)
{
	// register 0x03, PWD bit: 5 (sets MASK_DIST)
	_sing_reg_write(0x03, 0x20, 0x00);
	Serial.println("disturber detection enabled");
}

void PWF_AS3935_I2C::AS3935_DisturberDis(void)
{
	// register 0x03, PWD bit: 5 (sets MASK_DIST)
	_sing_reg_write(0x03, 0x20, 0x20);
}

void PWF_AS3935_I2C::AS3935_SetIRQ_Output_Source(uint8_t irq_select)
{
	// set interrupt source - what to displlay on IRQ pin
	// reg 0x08, bits 5 (TRCO), 6 (SRCO), 7 (LCO)
	// only one should be set at once, I think
	// 0 = NONE, 1 = TRCO, 2 = SRCO, 3 = LCO
	
	if(1 == irq_select)
	{
		_sing_reg_write(0x08, 0xE0, 0x20);			// set only TRCO bit
	}
	else if(2 == irq_select)
	{
		_sing_reg_write(0x08, 0xE0, 0x40);			// set only SRCO bit
	}
	else if(3 == irq_select)
	{
		_sing_reg_write(0x08, 0xE0, 0x80);			// set only LCO bit
	}
	else // assume 0
	{
		_sing_reg_write(0x08, 0xE0, 0x00);			// clear IRQ pin display bits
	}
	
}

void PWF_AS3935_I2C::AS3935_SetTuningCaps(uint8_t cap_val)
{
	// Assume only numbers divisible by 8 (because that's all the chip supports)
	if(120 < cap_val)	// cap_value out of range, assume highest capacitance
	{
		_sing_reg_write(0x08, 0x0F, 0x0F);			// set capacitance bits to maximum
	}
	else
	{
		_sing_reg_write(0x08, 0x0F, (cap_val>>3));	// set capacitance bits
	}
	Serial.print("capacitance set to 8x");
	Serial.println((_sing_reg_read(0x08) & 0x0F));
}

uint8_t PWF_AS3935_I2C::AS3935_GetInterruptSrc(void)
{
	// definition of interrupt data on table 18 of datasheet
	// for this function:
	// 0 = unknown src, 1 = lightning detected, 2 = disturber, 3 = Noise level too high
	delay(10);						// wait 3ms before reading (min 2ms per pg 22 of datasheet)
	uint8_t int_src = (_sing_reg_read(0x03) & 0x0F);	// read register, get rid of non-interrupt data
	if(0x08 == int_src)
	{
		return 1;					// lightning caused interrupt
	}
	else if(0x04 == int_src)
	{
		return 2;					// disturber detected
	}
	else if(0x01 == int_src)
	{
		return 3;					// Noise level too high
	}
	else{return 0;}					// interrupt result not expected
	
}

uint8_t PWF_AS3935_I2C::AS3935_GetLightningDistKm(void)
{
	uint8_t strike_dist = (_sing_reg_read(0x07) & 0x3F);	// read register, get rid of non-distance data
	return strike_dist;
}

uint32_t PWF_AS3935_I2C::AS3935_GetStrikeEnergyRaw(void)
{
	uint32_t nrgy_raw = ((_sing_reg_read(0x06) & 0x1F) << 8);	// MMSB, shift 8  bits left, make room for MSB
	nrgy_raw |= _sing_reg_read(0x05);							// read MSB
	nrgy_raw <<= 8;												// shift 8 bits left, make room for LSB
	nrgy_raw |= _sing_reg_read(0x04);							// read LSB, add to others
	
	return nrgy_raw;
}

uint8_t PWF_AS3935_I2C::AS3935_SetMinStrikes(uint8_t min_strk)
{
	// This function sets min strikes to the closest available number, rounding to the floor, 
	// where necessary, then returns the physical value that was set. Options are 1, 5, 9 or 16 strikes.
	// see pg 22 of the datasheet for more info (#strikes in 17 min)
	if(5 > min_strk)
	{
		_sing_reg_write(0x02, 0x30, 0x00);
		return 1;
	}
	else if(9 > min_strk)
	{
		_sing_reg_write(0x02, 0x30, 0x10);
		return 5;
	}
	else if(16 > min_strk)
	{
		_sing_reg_write(0x02, 0x30, 0x20);
		return 9;
	}
	else
	{
		_sing_reg_write(0x02, 0x30, 0x30);
		return 16;
	}
}

void PWF_AS3935_I2C::AS3935_SetIndoors(void)
{
	// AFE settings addres 0x00, bits 5:1 (10010, based on datasheet, pg 19, table 15)
	// this is the default setting at power-up (AS3935 datasheet, table 9)
	_sing_reg_write(0x00, 0x3E, 0x24);
	Serial.println("set up for indoor operation");
}

void PWF_AS3935_I2C::AS3935_SetOutdoors(void)
{
	// AFE settings addres 0x00, bits 5:1 (01110, based on datasheet, pg 19, table 15)
	_sing_reg_write(0x00, 0x3E, 0x1C);
	Serial.println("set up for outdoor operation");
}

void PWF_AS3935_I2C::AS3935_ClearStatistics(void)
{
	// clear is accomplished by toggling CL_STAT bit 'high-low-high' (then set low to move on)
	_sing_reg_write(0x02, 0x40, 0x40);			// high
	_sing_reg_write(0x02, 0x40, 0x00);			// low
	_sing_reg_write(0x02, 0x40, 0x40);			// high
}

uint8_t PWF_AS3935_I2C::AS3935_GetNoiseFloorLvl(void)
{
	// NF settings addres 0x01, bits 6:4
	// default setting of 010 at startup (datasheet, table 9)
	uint8_t reg_raw = _sing_reg_read(0x01);		// read register 0x01
	return ((reg_raw & 0x70)>>4);				// should return value from 0-7, see table 16 for info
}

void PWF_AS3935_I2C::AS3935_SetNoiseFloorLvl(uint8_t nf_sel)
{
	// NF settings addres 0x01, bits 6:4
	// default setting of 010 at startup (datasheet, table 9)
	if(7 >= nf_sel)								// nf_sel within expected range
	{
		_sing_reg_write(0x01, 0x70, ((nf_sel & 0x07)<<4));
	}
	else
	{											// out of range, set to default (power-up value 010)
		_sing_reg_write(0x01, 0x70, 0x20);
	}
}

uint8_t PWF_AS3935_I2C::AS3935_GetWatchdogThreshold(void)
{
	// This function is used to read WDTH. It is used to increase robustness to disturbers,
	// though will make detection less efficient (see page 19, Fig 20 of datasheet)
	// WDTH register: add 0x01, bits 3:0
	// default value of 0001
	// values should only be between 0x00 and 0x0F (0 and 7)
	uint8_t reg_raw = _sing_reg_read(0x01);
	return (reg_raw & 0x0F);
}

void PWF_AS3935_I2C::AS3935_SetWatchdogThreshold(uint8_t wdth)
{
	// This function is used to modify WDTH. It is used to increase robustness to disturbers,
	// though will make detection less efficient (see page 19, Fig 20 of datasheet)
	// WDTH register: add 0x01, bits 3:0
	// default value of 0001
	// values should only be between 0x00 and 0x0F (0 and 7)
	_sing_reg_write(0x01, 0x0F, (wdth & 0x0F));
}

uint8_t PWF_AS3935_I2C::AS3935_GetSpikeRejection(void)
{
	// This function is used to read SREJ (spike rejection). Similar to the Watchdog threshold,
	// it is used to make the system more robust to disturbers, though will make general detection
	// less efficient (see page 20-21, especially Fig 21 of datasheet)
	// SREJ register: add 0x02, bits 3:0
	// default value of 0010
	// values should only be between 0x00 and 0x0F (0 and 7)
	uint8_t reg_raw = _sing_reg_read(0x02);
	return (reg_raw & 0x0F);
}

void PWF_AS3935_I2C::AS3935_SetSpikeRejection(uint8_t srej)
{
	// This function is used to modify SREJ (spike rejection). Similar to the Watchdog threshold,
	// it is used to make the system more robust to disturbers, though will make general detection
	// less efficient (see page 20-21, especially Fig 21 of datasheet)
	// WDTH register: add 0x02, bits 3:0
	// default value of 0010
	// values should only be between 0x00 and 0x0F (0 and 7)
	_sing_reg_write(0x02, 0x0F, (srej & 0x0F));
}

void PWF_AS3935_I2C::AS3935_SetLCO_FDIV(uint8_t fdiv)
{
	// This function sets LCO_FDIV register. This is useful in the tuning of the antenna
	// LCO_FDIV register: add 0x03, bits 7:6
	// default value: 00
	// set 0, 1, 2 or 3 for ratios of 16, 32, 64 and 128, respectively. 
	// See pg 23, Table 20 for more info.
	_sing_reg_write(0x03, 0xC0, ((fdiv & 0x03) << 5));
}

void PWF_AS3935_I2C::AS3935_PrintAllRegs(void)
{
	Serial.print("Reg 0x00: ");
	Serial.println(_sing_reg_read(0x00));
	Serial.print("Reg 0x01: ");
	Serial.println(_sing_reg_read(0x01));
	Serial.print("Reg 0x02: ");
	Serial.println(_sing_reg_read(0x02));
	Serial.print("Reg 0x03: ");
	Serial.println(_sing_reg_read(0x03));
	Serial.print("Reg 0x04: ");
	Serial.println(_sing_reg_read(0x04));
	Serial.print("Reg 0x05: ");
	Serial.println(_sing_reg_read(0x05));
	Serial.print("Reg 0x06: ");
	Serial.println(_sing_reg_read(0x06));
	Serial.print("Reg 0x07: ");
	Serial.println(_sing_reg_read(0x07));
	Serial.print("Reg 0x08: ");
	Serial.println(_sing_reg_read(0x08));
	uint32_t nrgy_val = AS3935_GetStrikeEnergyRaw();
	Serial.println(nrgy_val);
}

void PWF_AS3935_I2C::AS3935_ManualCal(uint8_t capacitance, uint8_t location, uint8_t disturber)
{
	// start by powering up
	AS3935_PowerUp();
	
	// indoors/outdoors next...
	if(1 == location)							// set outdoors if 1
	{
		AS3935_SetOutdoors();
	}
	else										// set indoors if anything but 1
	{
		AS3935_SetIndoors();
	}
	
	// disturber cal
	if(0 == disturber)							// disabled if 0
	{				
		AS3935_DisturberDis();
	}
	else										// enabled if anything but 0
	{
		AS3935_DisturberEn();
	}
	
	AS3935_SetIRQ_Output_Source(0);
	
	delay(500);
	// capacitance first... directly write value here
	AS3935_SetTuningCaps(capacitance);
	
	Serial.println("AS3935 manual cal complete");
}
// a nice function would be to read the last 'x' strike data values....