Project in progress

Simple DALI Controller © GPL3+

Simple device to control and initialize DALI lamps.

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Components and supplies

Necessary tools and machines

Apps and online services

About this project

Overview

I’m an electrical engineer and after installation works extra DALI RGB luminaries remained. I didn't have DALI controller, so I decided to use Arduino Nano. First of all, I read DALI protocol documents and decided to create library to work with DALI devices. You can find DALI library in the Internet, but you need to buy special DALI master.

In this project I'm using simple components (see diagram in the attachment):

  • ARDUINO Nano
  • AC/DC converter
  • LED luminaire ERCO Grasshopper with TRIDONIC driver
  • NPN transistor 2SC5271
  • Resistors
  • LEDs for indication

About DALI

DALI stands for Digital Addressable Lighting Interface. DALI is a worldwide standard, specified by the International Electrotechnical Commission (IEC). A DALI network consists of a controller and one or more luminaires that have DALI interfaces. The controller (DALI master) can monitor and control each luminaire by means of a bi-directional data exchange. The communication is via a two-wire, low-voltage bus running at a low speed (1200 bits per second). Signal levels are defined as 0±4.5 V for logical '0' and 16±6.5 V for logical '1'. Bus quiescent state is logical '1'. Manchester coding is used with 16-bit (plus start and stop) forward frames and 8-bit return frames. In Manchester coding, the bit state is defined by a transition at the center of the bit window: positive going transition = '1', negative going transition = '0'. The DALI protocol permits luminaires to be individually addressed. It also incorporates Group and Scene broadcast messages to simultaneously address multiple luminaires. A single DALI network can control up to 64 luminaires.

Every bit takes two periods. The defined bit rate of DALI is 1200 bps. So, 1 bit period is ~834 µsec. A frame is started by a start bit, and ends with two high-level stop bits (no change of phase). Data is transmitted with the MSB first. Between frames, the bus is in idle (high) state.

The settling time between two subsequent forward frames shall be at least 9.17 ms. This means that 4 forward frames with accompanying periods of 9.17 ms shall fit exactly in 100 ms.

The settling time between forward and backward frames (transition from forward to backward) shall be between 2.92 and 9.17 ms. After sending the forward frame, the master unit will wait for 9.17 ms. If no backward frame has been started after 9.17 ms, this is interpreted as “no answer” from the slave unit.

The settling time between backward and forward frames (transition from backward to forward) shall be at least 9.17 ms.

A new luminaire does not have a short address and so cannot respond to individual addressing. Since it was a new luminaire, it had to be initialized.

The DALI search process begins by assigning a 24-bit random address to up to 64 luminaires. The process is administered by DALI commands transmitted from the DALI master. This sets the luminaires to a state which permits 24-bit address searching and short address assignment. This state is limited by a 30-minute timer.

After randomizing the ballasts, the controller searches for the ballast with the lowest random number. It does this by issuing search address commands which contain the address that it is looking for, and compare commands which are queries, which get replies from all the ballasts that have that search address or lower as their random address.

Once the controller gets no replies, it backtracks one step to check the one ballast with that random address; then it assigns it a short address using a special program command which only takes effect in the ballast whose random address equals the search address (this is technically called the "selected" state). Then the controller tells that ballast to withdraw from the process so it doesn't respond to further compares this time round, and the search can continue for the next highest ballast.

Initialization of new luminaires (part 1)

Initialization of new luminaires (part 2)

After initialization we can control individual brightness of each lamp.

Lamp control

Using DALI library

Setup:

void setup() {
Serial.begin(74880); 
dali.setupTransmit(3); //setup digital pin to transmit commands
dali.setupAnalogReceive(0); //setup analog pin to receive response
/* 
Arduino must determine voltage of logic 1 and logic 0. 
It depends on power converter. 
*/
dali.busTest();  
/* 
true - reseive response with comments and text; 
false - receive response from lighting fixtures with out comments and text
*/
dali.msgMode = true; 
} 

Commands:

/*
Transmit command.
cmd1 - address byte
cmd2 - command byte
*/
dali.transmit(cmd1, cmd2) 
/*
receive response from lighting fixtures
*/
uint8_t response = dali.receive()
 
/*
check if lighting fixtures gave response
*/
bool response = dali.getResponse()
 
/*
Scan short addresses of lighting fixtures connected to bus.
*/
dali.scanShortAdd() 
/*
Initialise lighting fixtures without short addresses.
*/
dali.initialisation(); 

Schematics

DALI command list
dali_command_list_p2pEfN1KwP.docx
Curcuit diagram
Curcuit diagram qor7b4fuet

Code

Dali.cppArduino
#include "Dali.h"
#include <SoftwareSerial.h>



Dali::Dali() //constructor
{
  applyWorkAround1Mhz = 0;
}


void Dali::setTxPin(uint8_t pin)
{
  TxPin = pin; // user sets the digital pin as output
  pinMode(TxPin, OUTPUT); 
  digitalWrite(TxPin, HIGH);
}

void Dali::setRxAnalogPin(uint8_t pin)
{
	RxAnalogPin = pin; // user sets the digital pin as output
}

void Dali::workAround1MhzTinyCore(uint8_t a)
{
  applyWorkAround1Mhz = a;
}

void Dali::setupAnalogReceive(uint8_t pin) 
{
	setRxAnalogPin(pin); // user sets the analog pin as input
}


void Dali::setupTransmit(uint8_t pin)
{
  setTxPin(pin);
  speedFactor = 2;
  //we don't use exact calculation of passed time spent outside of transmitter
  //because of high ovehead associated with it, instead we use this 
  //emprirically determined values to compensate for the time loss
  
  #if F_CPU == 1000000UL
    uint16_t compensationFactor = 88; //must be divisible by 8 for workaround
  #elif F_CPU == 8000000UL
    uint16_t compensationFactor = 12; 
  #else //16000000Mhz
    uint16_t compensationFactor = 4; 
  #endif  

#if (F_CPU == 80000000UL) || (F_CPU == 160000000)   // ESP8266 80MHz or 160 MHz
  delay1 = delay2 = (HALF_BIT_INTERVAL >> speedFactor) - 2;
#else
  delay1 = (HALF_BIT_INTERVAL >> speedFactor) - compensationFactor;
  delay2 = (HALF_BIT_INTERVAL >> speedFactor) - 2;
  period = delay1 + delay2;
  
  #if F_CPU == 1000000UL
    delay2 -= 22; //22+2 = 24 is divisible by 8
    if (applyWorkAround1Mhz) { //definition of micro delay is broken for 1MHz speed in tiny cores as of now (May 2013)
      //this is a workaround that will allow us to transmit on 1Mhz
      //divide the wait time by 8
      delay1 >>= 3;
      delay2 >>= 3;
    }
  #endif
#endif

	}


void Dali::transmit(uint8_t cmd1, uint8_t cmd2) // transmit commands to DALI bus (address byte, command byte)
{
	sendBit(1);
	sendByte(cmd1);
	sendByte(cmd2);
	digitalWrite(TxPin, HIGH);
}


void Dali::sendByte(uint8_t b) 
{
	for (int i = 7; i >= 0; i--) 
	{
		sendBit((b >> i) & 1);
	}
}


void Dali::sendBit(int b) 
{		
 if (b) {
		sendOne();
	}
	else {
		sendZero();
	} 
}


void Dali::sendZero(void)
{
  digitalWrite(TxPin, HIGH);
  delayMicroseconds(delay2);
  digitalWrite(TxPin, LOW);
  delayMicroseconds(delay1);

}


void Dali::sendOne(void)
{
  digitalWrite(TxPin, LOW);
  delayMicroseconds(delay2);
  digitalWrite(TxPin, HIGH);
  delayMicroseconds(delay1);
}


void Dali::busTest() //DALI bus test
{
	int maxLevel;
	int minLevel;
	
	//Luminaries must turn on and turn off. If not, check connection.
	delay(100);
	dali.transmit(BROADCAST_C, OFF_C); //Broadcast ON
	delay(500);
	dali.transmit(BROADCAST_C, ON_C); //Broadcast OFF
	delay(100);
	while (!Serial);
	
	//Receive response from luminaries: max and min level
	dali.transmit(BROADCAST_C, QUERY_STATUS);
	maxLevel = dali.maxResponseLevel();
	dali.transmit(BROADCAST_C, QUERY_STATUS);
	minLevel = dali.minResponseLevel();

	dali.analogLevel = (int)(maxLevel + minLevel) / 2;
	
	
	


}


void Dali::splitAdd(long input, uint8_t &highbyte, uint8_t &middlebyte, uint8_t &lowbyte) 
{
	highbyte = input >> 16;
	middlebyte = input >> 8;
	lowbyte = input;
}



// define min response level
int Dali::minResponseLevel() 
{

	const uint8_t dalistep = 40; //us
	uint16_t rxmin = 1024;
	uint16_t dalidata;
	long idalistep;

	
	
	for (idalistep = 0; idalistep < dali.daliTimeout; idalistep = idalistep + dalistep) {
		dalidata = analogRead(RxAnalogPin);
		if (dalidata < rxmin) {
			rxmin = dalidata;
		};
		delayMicroseconds(dalistep);
	}
	return rxmin; 
}

// define max response level
int Dali::maxResponseLevel() 
{

	const uint8_t dalistep = 40; //us
	uint16_t rxmax = 0;
	uint16_t dalidata;
	long idalistep;

	
	for (idalistep = 0; idalistep < dali.daliTimeout; idalistep = idalistep + dalistep) {
		dalidata = analogRead(dali.RxAnalogPin);
		if (dalidata > rxmax) {
			rxmax = dalidata;
		};
		delayMicroseconds(dalistep);
	}
	return rxmax;
}


//scan for individual short address
void Dali::scanShortAdd()
{

	const int delayTime = 10;
	const uint8_t start_ind_adress = 0;
	const uint8_t finish_ind_adress = 127;
	uint8_t add_byte;
	uint8_t device_short_add;
	uint8_t response;
		
	dali.transmit(BROADCAST_C, OFF_C); // Broadcast Off
	delay(delayTime);
	
	if (dali.msgMode) {
		Serial.println("Short addresses:");
	}

	for (device_short_add = start_ind_adress; device_short_add <= 63; device_short_add++) {

		add_byte = 1 + (device_short_add << 1); // convert short address to address byte
		
		
		dali.transmit(add_byte, 0xA1);
		
		response = dali.receive();
		
		if (dali.getResponse) {
			
			dali.transmit(add_byte, ON_C); // switch on
			delay(1000);
			dali.transmit(add_byte, OFF_C); // switch off
			delay(1000);

		}
		else {
			response = 0;
		}

		
		
		if (dali.msgMode) {
			Serial.print("BIN: ");
			Serial.print(device_short_add, BIN);
			Serial.print(" ");
			Serial.print("DEC: ");
			Serial.print(device_short_add, DEC);
			Serial.print(" ");
			Serial.print("HEX: ");
			Serial.print(device_short_add, HEX);
			Serial.print(" ");
			if (dali.getResponse) {
				Serial.print("Get response");
			}
			else {
				Serial.print("No response");
			}
			Serial.println();
		}
		else {
			if (dali.getResponse) {
				Serial.println(255, BIN);
			}
			else {
				Serial.println(0, BIN);
			}
			
		}

	}

	dali.transmit(BROADCAST_C, ON_C); // Broadcast On
	Serial.println();
	delay(delayTime);

}


int Dali::readBinaryString(char *s) 
{
	int result = 0;
	while (*s) {
		result <<= 1;
		if (*s++ == '1') result |= 1;
	}
	return result;
}


bool Dali::cmdCheck(String & input, int & cmd1, int & cmd2) 
{
	bool test = true;

	input.replace(" ", "");   // Delete spaces

	if (input.length() != 16) {
		test = false; //check if command contain 16bit
	}
	else {
		for (int i = 0; i <= input.length() - 1; i++) {
			if ((int)input.charAt(i) == 49 or (int)input.charAt(i) == 48) {}
			else {
				test = false;
			};
		};
	};

	if (test) {
		cmd1 = readBinaryString(input.substring(0, 8).c_str());
		cmd2 = readBinaryString(input.substring(8, 16).c_str());
	}

	return test;
}

void Dali::initialisation() {

	const int delaytime = 10; //ms

	long low_longadd = 0x000000;
	long high_longadd = 0xFFFFFF;
	long longadd = (long)(low_longadd + high_longadd) / 2;
	uint8_t highbyte;
	uint8_t middlebyte;
	uint8_t lowbyte;
	uint8_t short_add = 0;
	uint8_t cmd2;

	delay(delaytime);
	dali.transmit(BROADCAST_C, RESET);
	delay(delaytime);
	dali.transmit(BROADCAST_C, RESET);
	delay(delaytime);
	dali.transmit(BROADCAST_C, OFF_C);
	delay(delaytime);
	dali.transmit(0b10100101, 0b00000000); //initialise
	delay(delaytime);
	dali.transmit(0b10100101, 0b00000000); //initialise
	delay(delaytime);
	dali.transmit(0b10100111, 0b00000000); //randomise
	delay(delaytime);
	dali.transmit(0b10100111, 0b00000000); //randomise

	if (dali.msgMode) {
		Serial.println("Searching fo long addresses:");
	}

	while (longadd <= 0xFFFFFF - 2 and short_add <= 64) {
		while ((high_longadd - low_longadd) > 1) {

			dali.splitAdd(longadd, highbyte, middlebyte, lowbyte); //divide 24bit adress into three 8bit adresses
			delay(delaytime);
			dali.transmit(0b10110001, highbyte); //search HB
			delay(delaytime);
			dali.transmit(0b10110011, middlebyte); //search MB
			delay(delaytime);
			dali.transmit(0b10110101, lowbyte); //search LB
			delay(delaytime);
			dali.transmit(0b10101001, 0b00000000); //compare
			
			if (minResponseLevel() > dali.analogLevel) 
			{
				low_longadd = longadd;
			}
			else 
			{
				high_longadd = longadd;
			}
			
			longadd = (low_longadd + high_longadd) / 2; //center

			if (dali.msgMode) {
				Serial.print("BIN: ");
				Serial.print(longadd + 1, BIN);
				Serial.print(" ");
				Serial.print("DEC: ");
				Serial.print(longadd + 1, DEC);
				Serial.print(" ");
				Serial.print("HEX: ");
				Serial.print(longadd + 1, HEX);
				Serial.println();
			}
			else {
				Serial.println(longadd + 1);
			}
		} // second while


		if (high_longadd != 0xFFFFFF) 
		{
			splitAdd(longadd + 1, highbyte, middlebyte, lowbyte);
			dali.transmit(0b10110001, highbyte); //search HB
			delay(delaytime);
			dali.transmit(0b10110011, middlebyte); //search MB
			delay(delaytime);
			dali.transmit(0b10110101, lowbyte); //search LB
			delay(delaytime);
			dali.transmit(0b10110111, 1 + (short_add << 1)); //program short adress
			delay(delaytime);
			dali.transmit(0b10101011, 0b00000000); //withdraw
			delay(delaytime);
			dali.transmit(1 + (short_add << 1), ON_C);
			delay(1000);
			dali.transmit(1 + (short_add << 1), OFF_C);
			delay(delaytime);
			short_add++;

			if (dali.msgMode) {	
			Serial.println("Assigning a short address");
			}

			high_longadd = 0xFFFFFF;
			longadd = (low_longadd + high_longadd) / 2;

		}
		else {
			if (dali.msgMode) { 
				Serial.println("End"); 
			}
		}
	} // first while


	dali.transmit(0b10100001, 0b00000000);  //terminate
	dali.transmit(BROADCAST_C, ON_C);  //broadcast on
}


uint8_t Dali::receive() {


	
	unsigned long startFuncTime = 0;
	bool previousLogicLevel = 1;
	bool currentLogicLevel = 1;
	uint8_t arrLength = 20;
	int  timeArray[arrLength];
	int i = 0;
	int k = 0;
	bool logicLevelArray[arrLength];
	int response = 0;

	dali.getResponse = false;
	startFuncTime = micros();
	
	// add check for micros overlap here!!!

	while (micros() - startFuncTime < dali.daliTimeout and i < arrLength)
	{
		// geting response
		if (analogRead(dali.RxAnalogPin) > dali.analogLevel) {
			currentLogicLevel = 1;
		}
		else {
			currentLogicLevel = 0;
		}

		if (previousLogicLevel != currentLogicLevel) {
			timeArray[i] = micros() - startFuncTime;
			logicLevelArray[i] = currentLogicLevel;
			previousLogicLevel = currentLogicLevel;
			dali.getResponse = true;
			i++;

		}
	}

		
	
	arrLength = i;

	//decoding to manchester
	for (i = 0; i < arrLength - 1; i++) {
		if ((timeArray[i + 1] - timeArray[i]) > 0.75 * dali.period) {
			for (k = arrLength; k > i; k--) {
				timeArray[k] = timeArray[k - 1];
				logicLevelArray[k] = logicLevelArray[k - 1];
			}
			arrLength++;
			timeArray[i + 1] = (timeArray[i] + timeArray[i + 2]) / 2;
			logicLevelArray[i + 1] = logicLevelArray[i];
		}
	}





	k = 8;

	for (i = 1; i < arrLength; i++) {
		if (logicLevelArray[i] == 1) {
			if ((int)round((timeArray[i] - timeArray[0]) / (0.5 * dali.period)) & 1) {
				response = response + (1 << k);
			}
			k--;
		}
	}

	
	//remove start bit
	response = (uint8_t)response;
	
	return response;

}




	Dali dali;
Dali.hArduino
#ifndef dali_h
#define dali_h
#include <SoftwareSerial.h>

//timer scaling factors for different transmission speeds
#define MAN_300 0
#define MAN_600 1
#define MAN_1200 2
#define MAN_2400 3
#define MAN_4800 4
#define MAN_9600 5
#define MAN_19200 6
#define MAN_38400 7

/*
Timer 2 in the ATMega328 and Timer 1 in a ATtiny85 is used to find the time between
each transition coming from the demodulation circuit.
Their setup is for sampling the input in regular intervals.
For practical reasons we use power of 2 timer prescaller for sampling, 
for best timing we use pulse lenght as integer multiple of sampling speed.
We chose to sample every 8 ticks, and pulse lenght of 48 ticks 
thats 6 samples per pulse, lower sampling rate (3) will not work well for 
innacurate clocks (like internal oscilator) higher sampling rate (12) will
cause too much overhead and will not work at higher transmission speeds.
This gives us 16000000Hz/48/256 = 1302 pulses per second (so it's not really 1200) 
At different transmission speeds or on different microcontroller frequencies, clock prescaller is adjusted 
to be compatible with those values. We allow about 50% clock speed difference both ways
allowing us to transmit even with up to 100% in clock speed difference
*/

// DALI coomands
#define BROADCAST_DP 0b11111110
#define BROADCAST_C 0b11111111
#define ON_DP 0b11111110
#define OFF_DP 0b00000000
#define ON_C 0b00000101
#define OFF_C 0b00000000
# define QUERY_STATUS 0b10010000
# define RESET 0b00100000


//setup timing for transmitter
#define HALF_BIT_INTERVAL 1666 





#if defined(ARDUINO) && ARDUINO >= 100
  #include "Arduino.h"
#else
  #include "WProgram.h"
  #include <pins_arduino.h>
#endif

class Dali
{
  public:
	Dali(); //the constructor
    void setTxPin(uint8_t pin); //set the arduino digital pin for transmit. 
    void setRxAnalogPin(uint8_t pin); //set the arduino digital pin for receive.
    void workAround1MhzTinyCore(uint8_t a = 1); //apply workaround for defect in tiny Core library for 1Mhz
    void setupTransmit(uint8_t pin); //set up transmission
	void setupAnalogReceive(uint8_t pin);
    void transmit(uint8_t cmd1, uint8_t cmd2); //transmit 16 bits of data
	void scanShortAdd(); //scan for short address
	void busTest(); // bus test
	void initialisation(); //initialization of new luminaries
	bool cmdCheck(String & input, int & cmd1, int & cmd2);
	uint8_t receive(); //get response

	int minResponseLevel(); 
	int maxResponseLevel();
    
    uint8_t speedFactor;
    uint16_t delay1;
    uint16_t delay2;
	uint16_t period;
	String errorMsg; //error message of last operation
	bool msgMode; //0 - get only response from dali bus to COM; 1 - response with text (comments)
	bool getResponse;
	uint8_t RxAnalogPin;

	long daliTimeout = 20000; //us, DALI response timeout
	int analogLevel = 870; //analog border level (less - "0"; more - "1")
	


    
  private:
	
	void sendByte(uint8_t b); //transmit 8 bits of data
	void sendBit(int b); //transmit 1 bit of data
	void sendZero(void); //transmit "0"
    void sendOne(void); //transmit "1"
   	void splitAdd(long input, uint8_t &highbyte, uint8_t &middlebyte, uint8_t &lowbyte); //split random address 
	
	
	int readBinaryString(char *s);

	uint8_t TxPin;
	
    uint8_t applyWorkAround1Mhz;
	uint8_t rxAnalogPin = 0;

};//end of class Dali

// Cant really do this as a real C++ class, since we need to have
// an ISR
extern "C"
{
    
    
   }

extern Dali dali;

#endif
DALI.zipArduino
No preview (download only).
DALI.inoArduino
#include <Dali.h>


const int DALI_TX = 3;
const int DALI_RX_A = 0;



#define BROADCAST_DP 0b11111110
#define BROADCAST_C 0b11111111
#define ON_DP 0b11111110
#define OFF_DP 0b00000000
#define ON_C 0b00000101
#define OFF_C 0b00000000
# define QUERY_STATUS 0b10010000
# define RESET 0b00100000

void setup() {

  Serial.begin(74880);
  dali.setupTransmit(DALI_TX);
  dali.setupAnalogReceive(DALI_RX_A);
  dali.busTest();
  dali.msgMode = true;
  Serial.println(dali.analogLevel);
  help(); //Show help

}


void help() {
  Serial.println("Enter 16 bit command or another command from list:");
  Serial.println("help -  command list");
  Serial.println("on -  broadcast on 100%");
  Serial.println("off -  broadcast off 0%");
  Serial.println("scan -  device short address scan");
  Serial.println("initialise -  start process of initialisation");
  Serial.println();
}


void sinus () {
  uint8_t lf_1_add = 0;
  uint8_t lf_2_add = 1;
  uint8_t lf_3_add = 2;
  uint8_t lf_1;
  uint8_t lf_2;
  uint8_t lf_3;
  int i;
  int j = 0;

  while (Serial.available() == 0) {
    for (i = 0; i < 360; i = i + 1) {

      if (Serial.available() != 0) {
        dali.transmit(BROADCAST_C, ON_C);
        break;
      }

      lf_1 = (int) abs(254 * sin(i * 3.14 / 180));
      lf_2 = (int) abs(254 * sin(i * 3.14 / 180 + 2 * 3.14 / 3));
      lf_3 = (int) abs(254 * sin(i * 3.14 / 180 + 1 * 3.14 / 3));
      dali.transmit(lf_1_add << 1, lf_1);
      delay(5);
      dali.transmit(lf_2_add << 1, lf_2);
      delay(5);
      dali.transmit(lf_3_add << 1, lf_3);
      delay(5);
      delay(20);
    }
  }
}


void loop() {

  const int delaytime = 500;
  int i;
  int cmd1;
  int cmd2;
  String comMsg;


  // Read command from port

  delay(delaytime);

  while (Serial.available()) {
    comMsg = comMsg + (char)(Serial.read());
  }; // read data from serial

  if (comMsg == "sinus") {
    sinus();
  };

  if (comMsg == "scan") {
    dali.scanShortAdd();
  }; // scan short addresses

  if (comMsg == "on") {
    dali.transmit(BROADCAST_C, ON_C);
  }; // broadcast, 100%

  if (comMsg == "off") {
    dali.transmit(BROADCAST_C, OFF_C);
  }; // broadcast, 0%

  if (comMsg == "initialise" or comMsg == "ini") {
    dali.initialisation();
  }; // initialisation

  if (comMsg == "help") {
    help();
  }; //help


  if (dali.cmdCheck(comMsg, cmd1, cmd2)) {
    dali.transmit(cmd1, cmd2);  // command in binary format: (address byte, command byte)
  }
  delay(delaytime);

};
keywords.txtArduino
	dali	KEYWORD1	setTxPin	KEYWORD2	setRxAnalogPin	KEYWORD2	workAround1MhzTinyCore	KEYWORD2	setupTransmit	KEYWORD2	setupAnalogReceive	KEYWORD2	transmit	KEYWORD2	scanShortAdd	KEYWORD2	busTest	KEYWORD2	initialisation	KEYWORD2	cmdCheck	KEYWORD2	minResponseLevel	KEYWORD2	maxResponseLevel	KEYWORD2

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