Reading UART data from Xbee

Projects Networking, Protocols, and Devices
1

I am using the Arduino Micro and an Xbee S2C module to receive commands from another Xbee connected to my PC through XCTU. When I send a string of text to the Ardunio I would like to print the received data to the Serial Monitor window. I have attached the code I am using and for some reason, it will print the 1st byte and the remainder of the data will be printed on a new line.

For example, if I send the data "TEST#1" to the Arduino from XCTU, "T" will be printed on one line followed by "EST#1" on a separate line.

I have monitored the data using a logic analyzer and all of the data is being sent at the same time. I have used this same exact setup with an Atmega88 and Atmel Studio with no issues so I believe it has something to do with the Arduino Functions.

Any help would be appreciated.

#define GREEN_LED 13
#define GREEN_LED_OUTPUT pinMode(GREEN_LED, OUTPUT)
#define GREEN_LED_ON digitalWrite(GREEN_LED, HIGH)   // turn the LED on (HIGH is the voltage level)
#define GREEN_LED_OFF digitalWrite(GREEN_LED, LOW)    // turn the LED off by making the voltage LOW

///////Variables//////////////
int totalBytes = 0;

void setup()
{
  GREEN_LED_OUTPUT;
  GREEN_LED_OFF;
  Serial.begin(9600); // Open Serial Monitor Port and set BAUD rate to 9600
  Serial1.begin(9600); // Open Serial Port for Xbee and set BAUD rate to 9600
}

void loop()
{
  if (Serial1.available() > 0) // Check to see if data is available
  {
    totalBytes = Serial1.available();        // Find out how much data is available

    char message[totalBytes] = {0};         // Local array of char, totalBytes = # of elements, initialize elements to 0

    Serial1.readBytes(message, totalBytes);  // Fill up message array with serial data

    Serial.print("I received: ");           // Print caption
    Serial.write(message, totalBytes);      // Print contents of message
    Serial.println();                       // Move to next line

    message[totalBytes] = {0};              // Reset data in message array
  }

}
2

I have monitored the data using a logic analyzer and all of the data is being sent at the same time.

But it is sent, and received, one byte at a time.

While you are diddling around reading the first byte that arrives, and printing a long message, the rest of the data arrives.

Serial Input Basics - updated - Introductory Tutorials - Arduino Forum is mandatory reading.

3

Thank you Paul, that is exactly what I was looking for.