Usage of serial port on cRio

[basicxman]

We're having a lot of difficulty using the serial port on the cRio to interface with devices.

• Console out switch is off.
• Tried with an RS232 compass sensor
• Tried with an Arduino spitting out a single byte in a loop
• Confirmed correct serial data on both devices with a logic analyzer and Portmon

When running some very simple code (I sure hope I'm just doing something wrong) - the cRio will read some data (slowly) and then crash.

virtual void TeleopPeriodic() {
  int n = com.GetBytesReceived();
  if (n > 0) {
      char *buffer;
      printf("Reading\n");
      com.Read(buffer, n);
      printf("Done reading\n");

      for (int i = 0; i < n; i++) {
          printf("%d 0x%X\n", n, buffer[i]);
      }
}

Screenshot attached.