Title: build stk500+jtag ice Post by: ali_asadzadeh on January 09, 2009, 10:08:21 10:08 dear dudes!
this is my first post so i want to show you how you can build this staff 1-first of all we will use the same schematic of jtag ice. 2-we will use jtag boot to upgrade our Atmega16. 3-program your Atmega16 with boot.hex then start avr studio and from tools menu choose avr prog then find the upgrade.ebn in jtag ice folder of your avr studio. for example C:\Program Files\Atmel\AVR Tools\JTAGICE. 4-we will read back Atmega16 flash with another programmer and confirm the last code address in this example the address is 0x2d2d then open the hex file with notepad and delete the line that start with :103800000C942A1C0C94471C0C94471C0C94471CC9 and delete following lines till :00000001FF do not delete :00000001FF line and save the file. 5-once again program your chip first erase it and program it with new file. 6-we will set the start address of our stk500 firmware that i was written once jtag last byte + some words change the following line in makefile LDSECTION = --section-start=.text=0x2da0 7-then compile the stk500 code and program the chip without erasing it! 8-then we will use the following code in assembler(in asm folder) and set the fuse byte to SMALLBOOTSTART. in this code we will decide to choose between stk500 or jtag ice respect to pinc.6 if pin==0 then start stk500 else start jtag ice. 9-again we will program the chip without erasing it and using asm.hex. 10-in stk500 you can add a led to PORTB.2 for showing communications and stk500 pins is as follow sck sck pin of Atmega16 miso miso pin of Atmega16 mosi mosi pin of Atmega16 reset portb.1 of Atmega16 led portb.2 of Atmega16 now you have a cool tool to use. and do not forget that the crystal is 7.3728MHz and here is the complete code and schematic. http://www.avrfreaks.net/index.php?module=Freaks%20Academy&func=viewItem&item_id=1075&item_type=project i have made this and posted it in www.avrfreaks.net you can follow this link to donwload it.(you must be loged in and it's free to register). by the way what is the meaning of sonsivri. Title: Re: build stk500+jtag ice Post by: wellnerson1 on February 06, 2009, 09:18:53 09:18 Hai friend ali_asadzadeh,
Your hex code is OK, jtag communication is OK, but when stk500 communication is sought for atmel avr asks for upgrade as the code you have supplied is of old version and also gives some tips to upgrade, but i am unable to succeed in the process. Will you tell the forum members how to upgrade stk500. This upgrade is in relation with atmel avr studio 4.15 version. Thanks in advance. Title: Re: build stk500+jtag ice Post by: ali_asadzadeh on February 07, 2009, 08:50:35 08:50 you can actualy change the version in the include file that i send for stk500.just change the #define SOFTWARE_MINOR in the main.c and programm your chip with the instructions that i said.
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