This is the README file for USBasp.
USBasp is a USB in-circuit programmer for Atmel AVR controllers. It simply
-consists of an ATMega8 and a couple of passive components. The programmer
-uses a firmware-only USB driver, no special USB controller is needed.
+consists of an ATMega88 or an ATMega8 and a couple of passive components.
+The programmer uses a firmware-only USB driver, no special USB controller
+is needed.
Features:
- Works under multiple platforms. Linux, Mac OS X and Windows are tested.
LICENSE
-The project is built with AVR USB driver by Objective Development, which is
-published under a proprietary Open Source license. To conform with this
-license, USBasp is distributed under the same license conditions. See the
-file "firmware/usbdrv/License.txt" for details.
+USBasp is distributed under the terms and conditions of the GNU GPL version
+2 (see "firmware/usbdrv/License.txt" for details).
+
+USBasp is built with V-USB driver by OBJECTIVE DEVELOPMENT GmbH. See
+"firmware/usbdrv/" for further information.
LIMITATIONS
Hardware:
-"circuit/usbasp_5V_circuit.pdf" shows a simple circuit. It doesn't meet the
-voltage range on the data lines specified in USB 1.1. Also this circuit can
-only be used for programming 5V target systems. For other systems a level
-converter is needed.
+This package includes a circuit diagram. This circuit can only be used for
+programming 5V target systems. For other systems a level converter is needed.
Firmware:
The firmware dosn't support USB Suspend Mode. A bidirectional serial
USE PRECOMPILED VERSION
Firmware:
-Flash "bin/firmware/usbasp.xxxx-xx-xx.hex" to the ATMega8 with a working
-programmer (e.g. with avrdude, uisp, ...). Set jumper J2 to activate
+Flash "bin/firmware/usbasp.atmega88.xxxx-xx-xx.hex" or
+"bin/firmware/usbasp.atmega8.xxxx-xx-xx.hex" to the used controller with a
+working programmer (e.g. with avrdude, uisp, ...). Set jumper J2 to activate
USBasp firmware update function.
-You have to change the fuse bits for external crystal, e.g. high byte = 0xc9
-and low byte = 0x9f.
+You have to change the fuse bits for external crystal (see "make fuses").
+# TARGET=atmega8 HFUSE=0xc9 LFUSE=0xef
+# TARGET=atmega48 HFUSE=0xdd LFUSE=0xff
+# TARGET=atmega88 HFUSE=0xdd LFUSE=0xff
Windows:
Start Windows and connect USBasp to the system. When Windows asks for a
Supply target with 5V (USB voltage). Be careful with this option, the
circuit isn't protected against short circuit!
J2 Jumper for firmware upgrade (not self-upgradable)
- Set this jumper for flashing the ATMega8 of USBasp with another working
+ Set this jumper for flashing the ATMega(4)8 of USBasp with another working
programmer.
J3 SCK option
If the target clock is lower than 1,5 MHz, you have to set this jumper.
To compile the firmware
1. install the GNU toolchain for AVR microcontrollers (avr-gcc, avr-libc),
2. change directory to firmware/
-3. run "make"
-4. flash "main.hex" to the ATMega8. E.g. with uisp or avrdude (check
-the Makefile option "make avrdude"). To flash the firmware you have
+3. run "make main.hex"
+4. flash "main.hex" to the ATMega(4)8. E.g. with uisp or avrdude (check
+the Makefile option "make flash"). To flash the firmware you have
to set jumper J2 and connect USBasp to a working programmer.
-You have to change the fuse bits for external crystal, e.g. high byte = 0xc9
-and low byte = 0x9f.
+You have to change the fuse bits for external crystal, (check the Makefile
+option "make fuses").
Software (avrdude):
-The latest avrdude CVS version supports USBasp.
+AVRDUDE supports USBasp since version 5.2.
1. install libusb: http://libusb.sourceforge.net/
-2. get avrdude CVS version:
- cvs -z3 -d:pserver:anonymous@cvs.savannah.nongnu.org:/sources/avrdude co avrdude
-4. cd avrdude
+2. get latest avrdude release: http://download.savannah.gnu.org/releases/avrdude/
+3. cd avrdude-X.X.X
5. configure to your environment:
./bootstrap (I had to comment out the two if-blocks which verify the
installed versions of autoconf and automake)
change "avrdude_CPPFLAGS" to "AM_CPPFLAGS"
(why is this needed only on mac? bug in configure.ac?)
+Notes on Linux:
+To use USBasp as non-root, you have to define some device rules. See
+bin/linux-nonroot for an example.
FILES IN THE DISTRIBUTION
firmware ........................ Source code of the controller firmware
firmware/usbdrv ................. AVR USB driver by Objective Development
firmware/usbdrv/License.txt ..... Public license for AVR USB driver and USBasp
-circuit ......................... Circuit diagram in PDF
+circuit ......................... Circuit diagram in PDF and EAGLE format
bin ............................. Precompiled programs
bin/win-driver .................. Windows driver
+bin/firmware .................... Precompiled firmware
+bin/linux-nonroot ............... Linux device rule file
MORE INFORMATION
USBasp .......................... http://www.fischl.de/usbasp/
-Firmware-only AVR USB driver .... http://www.obdev.at/products/avrusb/
+Firmware-only V-USB driver ...... http://www.obdev.at/products/vusb/
avrdude ......................... http://www.nongnu.org/avrdude/
libusb .......................... http://libusb.sourceforge.net/
libusb-win32 .................... http://libusb-win32.sourceforge.net/
-2006-09-16 Thomas Fischl <tfischl@gmx.de>
+2011-05-28 Thomas Fischl <tfischl@gmx.de>
http://www.fischl.de
projects / pub / USBasp.git / blobdiff