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a57d315e4b
Optiboot does not support ArduinoasISP programmer. When avrdude runs and talks to an arduino running ArduinoISP, it needs the optiboot (entered due to auto-reset) to abort and start the ArduinoISP "application" when it sees communications at the wrong serial speed. Unfortunately, optiboot treats all unrecognized command characters as "no-ops" and responds/loops for more commands, leading to a nice loop that never gets to the sketch. This patch causes characters received with Framing errors (the most likely error for speed mis-matches) to NOT reset the watchdog timer (normally done in getch()), which will cause the application to start if it continues for "a while." (tested. Works! Running ArduinoISP at speeds as high as 57600 still causes the bootloader to start the sketch (although it fails later on for other reasons.)) (cherry picked from commit e81c1123b624b6cac7da018c9c786700f3152bc9)
This directory contains the Optiboot small bootloader for AVR
microcontrollers, somewhat modified specifically for the Arduino
environment.
Optiboot is more fully described here: http://code.google.com/p/optiboot/
and is the work of Peter Knight (aka Cathedrow), building on work of Jason P
Kyle, Spiff, and Ladyada. Arduino-specific modification are by Bill
Westfield (aka WestfW)
Arduino-specific issues are tracked as part of the Arduino project
at http://code.google.com/p/arduino
------------------------------------------------------------
Building optiboot for Arduino.
Production builds of optiboot for Arduino are done on a Mac in "unix mode"
using CrossPack-AVR-20100115. CrossPack tracks WINAVR (for windows), which
is just a package of avr-gcc and related utilities, so similar builds should
work on Windows or Linux systems.
One of the Arduino-specific changes is modifications to the makefile to
allow building optiboot using only the tools installed as part of the
Arduino environment, or the Arduino source development tree. All three
build procedures should yield identical binaries (.hex files) (although
this may change if compiler versions drift apart between CrossPack and
the Arduino IDE.)
Building Optiboot in the Arduino IDE Install.
Work in the .../hardware/arduino/bootloaders/optiboot/ and use the
"omake <targets>" command, which just generates a command that uses
the arduino-included "make" utility with a command like:
make OS=windows ENV=arduino <targets>
or make OS=macosx ENV=arduino <targets>
On windows, this assumes you're using the windows command shell. If
you're using a cygwin or mingw shell, or have one of those in your
path, the build will probably break due to slash vs backslash issues.
On a Mac, if you have the developer tools installed, you can use the
Apple-supplied version of make.
The makefile uses relative paths ("../../../tools/" and such) to find
the programs it needs, so you need to work in the existing optiboot
directory (or something created at the same "level") for it to work.
Building Optiboot in the Arduino Source Development Install.
In this case, there is no special shell script, and you're assumed to
have "make" installed somewhere in your path.
Build the Arduino source ("ant build") to unpack the tools into the
expected directory.
Work in Arduino/hardware/arduino/bootloaders/optiboot and use
make OS=windows ENV=arduinodev <targets>
or make OS=macosx ENV=arduinodev <targets>
Programming Chips Using the _isp Targets
The CPU targets have corresponding ISP targets that will actuall
program the bootloader into a chip. "atmega328_isp" for the atmega328,
for example. These will set the fuses and lock bits as appropriate as
well as uploading the bootloader code.
The makefiles default to using a USB programmer, but you can use
a serial programmer like ArduinoISP by changing the appropriate
variables when you invoke make:
make ISPTOOL=stk500v1 ISPPORT=/dev/tty.usbserial-A20e1eAN \
ISPSPEED=-b19200 atmega328_isp