Arduino sketch for serial passthrough

serial_passthrough

/**************************************************
* Simple pass-through serial application for
* Arduino and Arduino-clones.
* You can use this for testing and
* updating the Rogue Robotics
* uMMC Serial Data Module or
* uMP3 Playback Module.
*
* You will need the "NewSoftSerial" library
* available at the Arduino website.
* http://arduino.cc/
* http://arduino.cc/en/Reference/Libraries
***************************************************/
 
#include <NewSoftSerial.h>
 
// You can set this to whatever pins you have the uMMC or uMP3 connected.
// e.g. 4 is connected to uMMC "T", 5 is connected to uMMC "R"
NewSoftSerial out(7, 8);
 
// If you are using this to update the firmware on the uMMC or uMP3,
// you will have to make sure that both the Serial connection and the
// out connection are set to 9600 bps.
void setup()
{
  out.begin(19200);
  Serial.begin(19200);
//  pinMode(13, OUTPUT);
//  digitalWrite(13, 0);s
}
 
void loop()
{
//  digitalWrite(13, 0);
  if(out.available())
  {
//    digitalWrite(13, 1);
    Serial.print((uint8_t)out.read());
  }
  if(Serial.available())
  {
//    digitalWrite(13, 1);
    out.print((uint8_t)Serial.read());
  }
}

Correct loop:

void loop()
{
    while (Serial.available())
    {
        out.print((char)Serial.read());
    }

    while (out.available())
    {
        Serial.print((char)out.read());
    }
}