This is the README file for USBaspLoader.
USBaspLoader is a USB boot loader for AVR microcontrollers. It can be used on
-all AVRs with at least 2 kB of boot loader section, e.g. the popular ATMega8.
-The firmware is flashed into the upper 2 kB of the flash memory and takes
-control immediately after reset. If a certain hardware condition is met
+most AVRs with at least 2 kB of boot loader section, e.g. the popular ATMega8.
+The firmware is flashed into the bootloader-section of the flash memory and
+takes control immediately after reset. If a certain hardware condition is met
(this condition can be configured, e.g. a jumper), the boot loader waits for
data on the USB interface and loads it into the remaining part of the flash
memory. If the condition is not met, control is passed to the loaded firmware.
Readme.txt ........ The file you are currently reading.
firmware .......... Source code of the controller firmware.
firmware/usbdrv ... USB driver -- See Readme.txt in that directory for info
+updater ........... Source code of an updater-firmware exchanging bootloaders
License.txt ....... Public license (GPL2) for all contents of this project.
-Changelog.txt ..... Logfile documenting changes in soft-, firm- and hardware.
+Schematics.txt .... File giving infos about default and recommended hw-layout.
+
+*_usbasploader.hex precompiled USBaspLoader for default layout and settings
BUILDING AND INSTALLING
=======================
This project can be built on Unix (Linux, FreeBSD or Mac OS X) or Windows.
-For all platforms, you must first describe your hardware in the file
-"firmware/bootloaderconfig.h". See the documentation in the example provided
-with this distribution for details. Then edit "firmware/Makefile" to reflect
-the target device, the device's boot loader address and fuse bit values.
+For all platforms, you must first describe your hardware and layout
+specific parameters (PINs to use, etc...) in "firmware/bootloaderconfig.h".
+Some USB tuning is possible by modifying "firmware/usbconfig.h".
+All files provide working default settings, which can be used as an example.
+Then edit "Makefile.inc" (NEVER any Makefile directly!) to reflect
+the target device, and some feature set departing from the default one.
+(You also can edit "firmware/bootloaderconfig.h" to change feature set
+and therefore memory space requirements).
+Since now "Makefile.inc" has an automatic selection logic based on
+the type of the microcontroller, there is NO need for setting bootloader-
+addresses, lock- or fusebits anymore...
Building on Windows:
You need WinAVR for the firmware, see http://winavr.sourceforge.net/.
-To build the firmware with WinAVR, change into the "firmware" directory,
-check whether you need to edit the "Makefile" (e.g. change device settings,
-programmer hardware, clock rate etc.) or bootloaderconfig.h and type "make"
-to compile the source code. Before you upload the code to the device with
-"make flash", you should set the fuses with "make fuse". To protect the boot
-loader from overwriting itself, set the lock bits with "make lock" after
-uploading the firmware.
+To build the firmware with WinAVR, change into the "USBaspLoader" directory,
+check whether you need to edit the files mentioned above (e.g. change device
+settings, programmer hardware, clock rate etc.) and type "make" to compile
+the complete source code.
+After you upload the code to the device with "make flash", you should set
+the fuses with "make fuse".
+
+If you already have some working USBaspLoader on your controller, you can
+use "make update" to flash the "updater"-firmware to it.
+After starting this firmware on the microcontroller it will replace the
+old bootloader with the new one just compiled.
+The update-feature can be used on boards, where HVPP or ISP is not possible
+after production anymore. (Or you just want to save trouble laying out ISP.)
+Therefore you also could implement the "HAVE_SPMINTEREFACE_MAGICVALUE"-
+feature, protecting your board from wrong updates for other boards.
+
+At default configuration the bootloader protects itself from overwriting
+itself. In order to sustain the new update-capability, no lock bits
+("make lock") should be programmed after uploading the firmware and
+programming the fuse bits.
+
Building on Unix (Linux, FreeBSD and Mac):
You need the GNU toolchain and avr-libc for the firmware. See
avr-libc on Unix. For Mac OS X, we provide a read-made package, see
http://www.obdev.at/avrmacpack/
-To build the firmware, change to the "firmware" directory, edit "Makefile"
-and bootloaderconfig.h as described in the Windows paragraph above and type
-"make" to compile the source code. Before you upload the code to the device
-with "make flash", you should set the fuses with "make fuse". Then protect the
-boot loader firmware with "make lock".
-
+To build the firmware, change to the "USBaspLoader" directory, edit the
+files mentioned above if you need to change settings (as also described in
+the Windows paragraph above) and type "make" to compile the source code.
+After you upload the code to the device with "make flash", you should
+set the fuses with "make fuse".
+As described within the Windows paragraph, "make update" can also
+be used instead.
WORKING WITH THE BOOT LOADER
============================
programmer.
-USING THE USB DRIVER FOR YOUR OWN PROJECTS
-==========================================
-This project is not intended as a reference implementation. If you want to
-use AVR-USB in your own projects, please see
- * PowerSwitch for the most basic example,
- * Automator for an HID example or
- * AVR-Doper for a very complex example on how to simulate a serial
- interface (virtual COM port).
-All these projects can be downloaded from http://www.obdev.at/avrusb/
-
-
ABOUT THE LICENSE
=================
It is our intention to make our USB driver and this demo application
MORE INFORMATION
================
+For questions, reports, suggestions or just for fun please contact
+Stephan Baerwolf (matrixstorm@gmx.de) and/or visit demonstration-board
+for USBaspLoader at
+
+ http://matrixstorm.com/avr/tinyusbboard/
+
+
For more information about Objective Development's firmware-only USB driver
for Atmel's AVR microcontrollers please visit the URL
--
+recent version:
+(c) 2013 by Stephan Baerwolf
+matrixstorm@gmx.de
+
+initial version:
(c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH.
http://www.obdev.at/
projects / pub / USBaspLoader.git / blobdiff