文件列表:

kavr\kavr\kavr.c (7921, 2012-09-18)
kavr\kavr\kavr_3s_115200_16M.hex (1425, 2018-07-19)
kavr\kavr\kavr_3s_57600_8M.hex (1425, 2018-07-19)
kavr\kavr\Makefile (4381, 2018-07-19)
kavr\kavr\make_all.cmd (17, 2018-07-19)
kavr\kavr\Release.txt (1375, 2012-09-18)
kavr\Test\Download_app\Download_App.cmd (716, 2018-07-19)
kavr\Test\Download_app\Download_App1.cmd (717, 2018-07-19)
kavr\Test\Download_app\Download_App2.cmd (717, 2018-07-19)
kavr\Test\Download_app\Main.hex (18500, 2017-06-06)
kavr\Test\Download_app\Main1.hex (11392, 2018-07-19)
kavr\Test\Download_app\Main2.hex (13176, 2018-07-19)
kavr\Test\Download_kavr\Download_kavr.cmd (1255, 2018-07-19)
kavr\Test\Download_kavr\kavr_3s_115200_16M.hex (1425, 2018-07-19)
kavr\Test\Logic\app_update_sscom.gif (94234, 2018-07-19)
kavr\Test\Logic\kavr_115200_16MHz.logicdata (597870, 2018-07-19)
kavr\Test\Logic\kavr_57600_8MHz.logicdata (1066392, 2018-07-19)
kavr\Test\Download_app (0, 2018-07-19)
kavr\Test\Download_kavr (0, 2018-07-19)
kavr\Test\Logic (0, 2018-07-19)
kavr\kavr (0, 2018-07-19)
kavr\Test (0, 2018-07-19)
kavr (0, 2018-07-19)

About this project ================== kavr is an open source AVR boot loader written entirely in C. kavr supports updating firmware by sending hexfiles to the AVR processor via its serial port. A three wire (RxD, TxD, GND) serial port connection is sufficient. No special software is required on the host PC. Any serial port terminal such as HyperTerminal, Minicom etc. supporting XON/XOFF work fine with kavr. Even DOS commands (MODE, COPY) can be used. License ======= This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . How kavr works ============== kavr is an AVR boot loader. At reset, the AVR processor executes the code at the reset vector. Depending on fuse settings, the reset vector points at address zero (if no boot loader is used) or the reset vector points at an address in upper flash memory. This is where kavr resides. kavr itself needs to be programmed into the AVR processor using a hardware programmer such as any programmer supported by avrdude. Once installed, kavr interrupts the boot process for a short time checking for hexfile records received on the serial port. If so, kavr programs any received hexfile data into flash memory and then boots the new firmware application. If there are no hexfile records detected on the serial port, kavr boots the old firmware application as usual. How to update firmware with kavr ================================ In order to load new firmware into your board running the kavr boot loader you need to first generate a firmware hexfile. If not already part of your firmware makefile, add a command like this: avr-objcopy -j .text -j .data -O ihex firmware.elf firmware.hex Then, connect your board with a PC using a serial port cable. Run the terminal program of your choice on the PC. Configure the serial port for the baud rate hardcoded in your kavr boot loader and configure 8N1 protocol and xon/xoff (aka software) handshake. Example (DOS command prompt): C:\>mode com1 baud=9600 DATA=8 PARITY=n STOP=1 XON=on Next, reboot your board. Before the timeout hardcoded into your kavr boot loader, send your firmware hexfile to the serial port. kavr will flash the new firmware and then run it. Example (DOS command prompt): C:\>copy firmware.hex com1: Roll your own kavr ================== Are you ready to put kavr on your board? I am assuming you've got a recent WinAVR installed on your development machine and that you know how to use it. You will also need a hardware programmer supported by avrdude. First, tell kavr a few things about your board (clock params, MCU type...). Update the first parameters in the kavr Makefile with your parameters. Here you will also need to define settings for serial port baud rate and boot loader timeout. Which one you choose depends on the capbilities of your board and its typical firmware application. I typically use 9600 baud and 1 second timeout. Higher baud rates might or might not work, depending on your board's clock configuration. Then, build kavr for your board. Type "make". If there are any errors in the make process, go fix them. The makefile displays the amount of flash used for kavr (avr-size, the number under "text" matters). This number should be compatible with your boot loader start address (BOOTADDR) setting in the makefile and with your fuse settings. More specifically, BOOTADDR+size must not exceed your flash address space. Currently the code fits into 512 bytes (256 words) but this number may vary with your settings and with the compiler version you are using. Always double check that kavr fits into your flash. Next, hook up your hardware programmer with your board. Run "make flash". This installs kavr into the boot loader area of your board. Now, tell AVR to boot kavr instead of the firmware by programming its fuses for kavr mode. Run "make fuse". Done! kavr should now be a happy boot loader on your system. Please note that when you flash kavr, avrdude also erases your firmware image so you will need to re-install your firmware. Bugs/Enhancements? ================== kavr is open source software. It's licensed under GPL. The latest source code is available on Sourceforge (http://kavr.sourceforge.net). Please report any problems or feedback any proposals for enhancement using the Sourceforge tracker system. Donate ====== If you like kavr and if you use kavr for a project that you (or your employer) make money with, then you (or your employer) may want to consider donating a few bucks in return. Your donation will help offsetting development costs, hardware purchases, and other expenses (like travel to conferences) in support of ongoing development of the software.

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