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'''AVR boot code how to''' Due to a failure with the electrical system in the car last year, we had to replace the AVR, the new chip was missing a boot loader so this page is about what I did to program the AVR. The main source of information about the boot loader is here : GenBoard/Firmware/BootLoader. The command line for the most recent avrdude is a bit different to the advice given there, but it's easy to figure out (don't use ''-c stk200'', use ''-c bsd''). Use my command line for the actual upload of the boot loader, see below. Download the [http://www.vems.hu/files/MembersPage/MattiasSandgren/main.hex Boot loader hex file]. Download '''avrdude''' [http://savannah.nongnu.org/projects/avrdude/ here]. The boot loader hex file was swiped from an old firmware that was compilable (no WBO2 code removed, etc). First I followed the advice about the fuses and then went on to program the AVR boot code. * In avrdude for windows (winAVR) you need to install giveIO in the c:/winavr/bin/install_giveio.bat * Burning the fuses use this code: avrdude -v -c bsd -p m128 -U flash:w:main.hex -U lfuse:w:0x2f:m -U hfuse:w:c4:m -U efuse:w:ff:m -U lock:w:ef:m ---- <code> D:\VEMS>avrdude -c bsd -p m128 -U flash:w:main.hex avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.00s avrdude: Device signature = 0x1e9702 avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed To disable this feature, specify the -D option. avrdude: erasing chip avrdude: reading input file "main.hex" avrdude: input file main.hex auto detected as Intel Hex avrdude: writing flash (131072 bytes): Writing | ################################################## | 100% 50.61s avrdude: 131072 bytes of flash written avrdude: verifying flash memory against main.hex: avrdude: load data flash data from input file main.hex: avrdude: input file main.hex auto detected as Intel Hex avrdude: input file main.hex contains 131072 bytes avrdude: reading on-chip flash data: Reading | ################################################## | 100% 48.36s avrdude: verifying ... avrdude: 131072 bytes of flash verified avrdude: safemode: Fuses OK avrdude done. Thank you. </code> ---- This cable is to be used togheter with the "-C bsd" command in AVRDUDE ||AVR pin command||ISP header #||Parallel port pin||Notes|| ||AVR /RESET||5||7||Yellow|| ||AVR SCK (clock input)||3||8||Black|| ||AVR PDI (RXD) (instruction in)||4||9||Red|| ||AVR PDO (TXD) (data out)||1||10||Orange|| ||Signal Ground||6||18||Brown|| * MOSI and MISO are not used. Correct pins from the schematics AVR pin 2 = RXD/PDI -> ISP header Pin4, AVR Pin3 = TXD/PDO -> ISP header pin 1 This is what it looked like: http://www.vems.hu/files/MembersPage/MattiasSandgren/avr_isp_cable/avr_isp_cable_attached.jpg http://www.vems.hu/files/MembersPage/MattiasSandgren/avr_isp_cable/avr_isp_cable_ends.jpg
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