Code (C++)

/*
    Name:       I2C_Master_Tut_Mod2.ino
    Created:	3/25/2020 8:54:55 AM
    Author:     FRANKNEWXPS15\Frank
*/


/*
    Name:       I2C_Master_Tutorial.ino
    Created:	3/23/2020 1:20:08 PM
    Author:     FRANKNEWXPS15\Frank
*/
/*
  I2C Master Demo
  i2c-master-demo.ino
  Demonstrate use of I2C bus
  Master sends character and gets reply from Slave
  DroneBot Workshop 2019
  https://dronebotworkshop.com
*/

// Include Arduino Wire library for I2C
#include <Wire.h>
#include "PrintEx.h"
#include "I2C_Anything.h"
// Define Slave I2C Address
#define SLAVE_ADDR 9
StreamEx mySerial = Serial; //added 03/18/18 for printf-style printing

// Define Slave answer size
#define ANSWERSIZE 5
const float myfloat = 3.14159;

void setup() {

    // Initialize I2C communications as Master
    Wire.begin();

    // Setup serial monitor
    Serial.begin(115200);
    Serial.println("I2C Master Demonstration");
}

void loop() {
    delay(50);
    //Serial.println("Write data to slave");
    mySerial.printf("Write data to slave\n");

    // Write a charatre to the Slave
    Wire.beginTransmission(SLAVE_ADDR);
    //Wire.write(0);
    I2C_writeAnything(myfloat);
    Wire.endTransmission();

    Serial.println("Receive data");

    // Read response from Slave
    // Read back 5 characters
    Wire.requestFrom(SLAVE_ADDR, ANSWERSIZE);

    // Add characters to string
    String response = "";
    while (Wire.available()) {
        char b = Wire.read();
        response += b;
    }

    // Print to Serial Monitor
    Serial.println(response);
} 

Code (C++)

/*
    Name:       I2C_Master_Tut_Mod1.ino
    Created:	3/24/2020 12:31:34 PM
    Author:     FRANKNEWXPS15\Frank

    Add
*/


/*
    Name:       I2C_Master_Tutorial.ino
    Created:	3/23/2020 1:20:08 PM
    Author:     FRANKNEWXPS15\Frank
*/
/*
  I2C Master Demo
  i2c-master-demo.ino
  Demonstrate use of I2C bus
  Master sends character and gets reply from Slave
  DroneBot Workshop 2019
  https://dronebotworkshop.com
*/

// Include Arduino Wire library for I2C
#include <Wire.h>
#include <PrintEx.h> //allows printf-style printout syntax
#include <I2C_Anything.h>
StreamEx mySerial = Serial; //added 03/18/18 for printf-style printing

// Define Slave I2C Address
#define SLAVE_ADDR 9

// Define Slave answer size
#define ANSWERSIZE 5

const float floatval = 3.14159;

void setup() {

    // Initialize I2C communications as Master
    Wire.begin();

    // Setup serial monitor
    Serial.begin(115200);
    mySerial.printf("I2C Master Demonstration\n");
}

void loop() {
    delay(50);
    mySerial.printf("Write data to slave\n");

    // Write a charatre to the Slave
    Wire.beginTransmission(SLAVE_ADDR);
    //Wire.write(0);
    //I2C_writeAnything(floatval);
    Wire.endTransmission();

    mySerial.printf("Receive data\n");

    // Read response from Slave
    // Read back 5 characters
    Wire.requestFrom(SLAVE_ADDR, ANSWERSIZE);

    // Add characters to string
    String response = "";
    while (Wire.available()) {
        char b = Wire.read();
        response += b;
    }

    // Print to Serial Monitor
    Serial.println(response);
} 

Code (C++)

#include <Wire.h>
#include <PrintEx.h> //allows printf-style printout syntax
#include <I2C_Anything.h>
StreamEx mySerial = Serial; //added 03/18/18 for printf-style printing

// Define Slave I2C Address
#define SLAVE_ADDR 9

// Define Slave answer size
#define ANSWERSIZE 5

const float floatval = 3.14159;

void setup() {

    // Initialize I2C communications as Master
    Wire.begin();

    // Setup serial monitor
    Serial.begin(115200);
    mySerial.printf("I2C Master Demonstration\n");
}

void loop() {
    delay(50);
    mySerial.printf("Write data to slave\n");

    // Write a charatre to the Slave
    Wire.beginTransmission(SLAVE_ADDR);
    //Wire.write(0);
    //I2C_writeAnything(floatval);
    Wire.endTransmission();

    mySerial.printf("Receive data\n");

    // Read response from Slave
    // Read back 5 characters
    Wire.requestFrom(SLAVE_ADDR, ANSWERSIZE);

    // Add characters to string
    String response = "";
    while (Wire.available()) {
        char b = Wire.read();
        response += b;
    }

    // Print to Serial Monitor
    Serial.println(response);
} 

Code (C++)

#include <Wire.h>
#include "PrintEx.h"
#include "I2C_Anything.h"
// Define Slave I2C Address
#define SLAVE_ADDR 9
StreamEx mySerial = Serial; //added 03/18/18 for printf-style printing

// Define Slave answer size
#define ANSWERSIZE 5
const float sendval = 3.14159f;
float rcvval = 0;

void setup() {

    // Initialize I2C communications as Master
    Wire.begin();

    // Setup serial monitor
    Serial.begin(115200);
    Serial.println("I2C Master Demonstration");
}

void loop() {
    delay(50);
    //Serial.println("Write data to slave");
    mySerial.printf("Sent %3.5f: ",sendval);

    // Write a charatre to the Slave
    Wire.beginTransmission(SLAVE_ADDR);
    //Wire.write(0);
    I2C_writeAnything(sendval);
    Wire.endTransmission();

      //03/26/2020 gfp rev to retrieve float value
    Wire.requestFrom(SLAVE_ADDR, sizeof(float));
    I2C_readAnything(rcvval);
    mySerial.printf("Received %4.1f\n",rcvval);
}