Problems in Serial.begin

Forum 2005-2010 (read only) Software Troubleshooting
1

Hi,

I'm trying to keep up to date with svn repository, which at this time is at revision 1099. I'm usiing CLI.

The problem comes when I try to compile something with Serial.begin inside setup(), like this:

void setup() {
  Serial.begin(38400);
}

The error:

dbolgheroni@mob-compaq:~/tcc/arduino/projects/perlduino$ make 
test -d applet || mkdir applet
echo '#include "WProgram.h"' > applet/perlduino.cpp
cat perlduino.pde >> applet/perlduino.cpp
cat ../../libs/hardware/cores/arduino/main.cpp >> applet/perlduino.cpp
/usr/local/bin/avr-g++ -mmcu=atmega2560 -I. -DF_CPU=16000000 -I../../libs/hardware/cores/arduino -Os -o applet/perlduino.elf applet/perlduino.cpp -L. applet/core.a -lm
applet/core.a(Print.o): In function `Print::print(String const&)':
Print.cpp:(.text+0xa6): undefined reference to `String::operator[](unsigned int) const'
*** Error code 1

Stop in /home/dbolgheroni/tcc/arduino/projects/perlduino (line 202 of BSDmakefile).
dbolgheroni@mob-compaq:~/tcc/arduino/projects/perlduino$

This doesn't happen if I remove Serial.begin, nor if I use a more ancient revision (like revision 808).

What's wrong with Serial.begin in newer revisions? Can't figure it out by just looking at the error message.

Thank you.

2

If you have the String Library installed, remove it.

3

The problem isn't with String. It's with Print.

4

How do you arrive at that conclusion?

5

The relevant part of the error message is this:

In function Print::print(String const&)': undefined reference to String::operator[](unsigned int) const'

The first part of the message is telling you that the Print::print method that prints a string is the source of the problem.

The second part of that message is telling you what the problem is. The Print::print method is invoking a function (String::operator[]) that does not exist.

There has been a major change in the String class. It is likely that you are working with an older version of the String class and a newer version of the Print class that expects certain behavior from the String class, and that behavior is not present in the String class you have.