Build a String

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Here is an example of how I build a Serial string:

void fSendSerialToBrain( void *pvParameters )
{
  struct stu_LIDAR_INFO pxLIDAR_INFO;
  xSemaphoreGive ( sema_SendSerialToBrain );
  String sSerial;
  sSerial.reserve ( 300 );
  for (;;)
  {
    xEventGroupWaitBits (eg, evtSendSerialToBrain, pdTRUE, pdTRUE, portMAX_DELAY);
    if ( xSemaphoreTake( sema_SendSerialToBrain, xZeroTicksToWait ) == pdTRUE ) // grab semaphore, no wait
    {
      int CellCount = 1;
      xSemaphoreTake( sema_LIDAR_INFO, xSemaphoreTicksToWait );
      xQueueReceive ( xQ_LIDAR_INFO, &pxLIDAR_INFO, QueueReceiveDelayTime );
      xSemaphoreGive( sema_LIDAR_INFO );
      sSerial.concat( "<!," ); //sentence begin
      sSerial.concat( String(ScanPoints) + "," );
      for ( CellCount; CellCount <= ScanPoints; CellCount++ )
      {
        sSerial.concat( String(pxLIDAR_INFO.Range[CellCount]) + "," );
      }
      sSerial.concat( ">" ); //sentence end
      // Serial.println ( sSerial );
      SerialBrain.println ( sSerial );
      sSerial = "";
    }
  }
  vTaskDelete( NULL );
} // void fSendSerialToBrain( void *pvParameters )

First I designate a String to hold the data and then I set the number of bytes for the String to use. What, also, happens is the String will use the same, set aside, memory locations, instead of making memory holes, like so:

  String sSerial;
  sSerial.reserve ( 300 );

Then I build the String like so:

      sSerial.concat( "<!," ); //sentence begin
      sSerial.concat( String(ScanPoints) + "," );
      for ( CellCount; CellCount <= ScanPoints; CellCount++ )
      {
        sSerial.concat( String(pxLIDAR_INFO.Range[CellCount]) + "," );
      }
      sSerial.concat( ">" ); //sentence end

, using the string buffer and sSerial.concat, the String to be sent is completed, sent on its way, and the buffer is cleared with sSerial = ""; and readied for the next String.

The best way is not to use a String.

Try this:

char myString[50] = "";
int i = 0;

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  byte n = Serial.available();
  if (n == 1)
  {
    char ch = Serial.read();
    myString[i] = ch;
    i++;
    Serial.print(ch);
  }
}

serMon-2.png

serMon-2.png

Strings cause memory problems and your program may crash. I use snprintf() to make a C-string (a zero terminated character array).

Example:

char line[10];
snprintf(line,sizeof(line),"<T%d*>",n); //"n" is the number read from the serial port

Better still, build a string.

    myString[i++] = ch;
    myString [i] = '\0';
    // With appropriate bounds checks