Join GitHub today
GitHub is home to over 28 million developers working together to host and review code, manage projects, and build software together.Sign up
No description, website, or topics provided.
|Type||Name||Latest commit message||Commit time|
|Failed to load latest commit information.|
tinyJTAG is a modification of the USBasp project to program via JTAG instead of SPI or TPI, and to run on the ATtiny85. LICENSE tinyJTAG is distributed under the terms and conditions of the GNU GPL version 2 (see "firmware/usbdrv/License.txt" for details). CAUTIONS Hardware: All 6 IO pins of the ATtiny85 are used, including the reset pin. The RSTDISBL fuse needs to be programmed to disable external reset funcionality and enable use of the reset pin as IO. After programming the fuse the part can only be programmed through a high-voltage programmmer, or through the USBaspLoader-tiny85 boot loader. The project is intended to be used in conjunction with the USBaspLoader-tiny85 boot loader, and so doesn't include an easy way to disable the external reset fuse in the makefile. The USBaspLoader-tiny85 boot loader should be loaded on to the part first, tested to make sure it was flashed properly, then the reset fuse can be disabled and the tinyJTAG firmware loaded through AVRDUDE. Use: If loading the the precompiled binary with bootloader, the bootloader will identify itself as a USBasp programmer with an ATtiny85 target for five seconds before starting the tinyJTAG programmer, which will identify itself as a USBasp programmer. Wait for five seconds after connecting the tinyJTAG programmer to USB before using AVRDUDE to connect to the JTAG target. Be especially cautious when programming ATtiny85 targets that you are connected to the tinyJTAG application and not the bootloader, as you could inadvertently erase the tinyJTAG application. USE PRECOMPILED VERSION Firmware: Set the fuses and load USBaspLoader-tiny85 onto the tiny85 using your programmer of choice - "make fuses" and "make flash" in USBaspLoader-tiny85\firmware directory Verify that the boot loader was loaded correctly and that AVRDUDE can connect to it - a signature read in AVRDUDE should show the ATtiny85 fuses When you're sure you're ready, disable the external reset fuse on the tiny85 - see "CAUTIONS" in the USBaspLoader-tiny85 project - "make disablereset" in USBaspLoader-tiny85\firmware directory Load the tinyJTAG firmware - "make flash" in tinyJTAG/firmware directory There are no jumpers that need to be set for programming with an external programmer BUILDING AND INSTALLING FROM SOURCE CODE Firmware: ... For more information on the tinyJTAG programmer, please visit the following URL: http://www.embedded-creations.com (c) 2012 Louis Beaudoin Below is the unmodified README file for USBasp: ========================================================================= This is the README file for USBasp. USBasp is a USB in-circuit programmer for Atmel AVR controllers. It simply 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. - No special controllers or smd components are needed. - Programming speed is up to 5kBytes/sec. - SCK option to support targets with low clock speed (< 1,5MHz). - Planned: serial interface to target (e.g. for debugging). LICENSE 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: 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 interface to slave exists in hardware but the firmware doesn't support it yet. USE PRECOMPILED VERSION Firmware: 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 (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 driver, choose "bin/win-driver". On Win2k and WinXP systems, Windows will warn that the driver is is not 'digitally signed'. Ignore this message and continue with the installation. Now you can run avrdude. Examples: 1. Enter terminal mode with an AT90S2313 connected to the programmer: avrdude -c usbasp -p at90s2313 -t 2. Write main.hex to the flash of an ATmega8: avrdude -c usbasp -p atmega8 -U flash:w:main.hex Setting jumpers: J1 Power target 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 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. Then SCK is scaled down from 375 kHz to about 8 kHz. BUILDING AND INSTALLING FROM SOURCE CODE Firmware: To compile the firmware 1. install the GNU toolchain for AVR microcontrollers (avr-gcc, avr-libc), 2. change directory to firmware/ 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, (check the Makefile option "make fuses"). Software (avrdude): AVRDUDE supports USBasp since version 5.2. 1. install libusb: http://libusb.sourceforge.net/ 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) ./configure 6. compile and install it: make make install Notes on Windows (Cygwin): Download libusb-win32-device-bin-x.x.x.x.tar.gz from http://libusb-win32.sourceforge.net/ and unpack it. -> copy lib/gcc/libusb.a to lib-path -> copy include/usb.h to include-path cd avrdude ./configure LDFLAGS="-static" --enable-versioned-doc=no make Notes on Darwin/MacOS X: after "./configure" I had to edit Makefile: 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 Readme.txt ...................... The file you are currently reading 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 and EAGLE format bin ............................. Precompiled programs bin/win-driver .................. Windows driver bin/firmware .................... Precompiled firmware bin/linux-nonroot ............... Linux device rule file MORE INFORMATION For more information on USBasp and it's components please visit the following URLs: USBasp .......................... http://www.fischl.de/usbasp/ 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/ 2011-05-28 Thomas Fischl <email@example.com> http://www.fischl.de