/*
Read 3 comma seperated values into variables from Serial connection

Examples used to create this:
https://forum.arduino.cc/t/decode-comma-separated-values/960564/4
*/

// Serial data variables
// Incoming Serial Data Array
const byte kNumberOfChannelsFromExcel = 3;

// Comma delimiter to separate consecutive data if using more than 1 sensor
const char kDelimiter = ',';    
// Interval between serial writes
const int kSerialInterval = 50;   
// Timestamp to track serial interval
unsigned long serialPreviousTime; 

char* arr[kNumberOfChannelsFromExcel];

// variables to read as comma seperate data:
float value1 = 0, value2 = 0, value3 = 0;

void setup() {
  Serial.begin(9600);
  Serial.println("<Arduino is ready>");
}

void loop() {
  Serial.println("Enter data:");
  while (Serial.available() == 0) {}     //wait for data available
  String line = Serial.readString();  //read until timeout
  line.trim();                        // remove any \r \n whitespace at the end of the String
  
  if (line.indexOf(',')>=0) {
    Serial.print("Received: <"); Serial.print(line); Serial.println(">");
  } else {
    Serial.println("Line received does not have comma seperated values. Ignoring line.");
    return;
  }

  parseData(line.c_str());

  // convert strings to actual values and put in the right variable:
  value1 = atof(arr[0]);
  value2 = atof(arr[1]);
  value3 = atof(arr[2]);
  
  Serial.print("Received: value1="); Serial.print(value1);
  Serial.print(" value2="); Serial.print(value2);
  Serial.print(" value3="); Serial.print(value3);
  Serial.println("");
}


// Seperate the data at each delimeter
void parseData(char data[]) {
    char *token = strtok(data, ","); // Find the first delimeter and return the token before it
    int index = 0; // Index to track storage in the array
    while (token != NULL){ // Char* strings terminate w/ a Null character. We'll keep running the command until we hit it
      arr[index] = token; // Assign the token to an array
      token = strtok(NULL, ","); // Continue to the next delimeter
      index++; // increment index to store next value
    }
}