Sets the device to be used when the stdio functions like printf
are invoked to write to stdout. The available devices are
NULL_STDOUT, LCD_STDOUT and SERIAL_STDOUT. For example, if all
the output should go to the LCD, set LCD_STDOUT as the stdout as
shown below.
Example
board_stdout(LCD_STDOUT); // Set LCD as stdout device.
printf(“Hello World”); // Message goes to the LCD.
