Using atmel JTAGICE3 to burn code into arduino
Need Atmel Studio on PC. the connection is as following, the target board need to be powered. then open the avr studio, you can find Device programming under tools.. select tool and device interface, then must press Apply pread read on device signature and target voltage will show you the target chip status. Go to Memory, then select desired hex file in the flash area, here I choose arduino bootloader Then press program, it will start...the speed depends on the selection on interface settings. the ISP clock should be lower than 1/4 of device frequency We can also use arduino IDE for development and burn the hex in to chip with JTAG, in this case, we skip the bootloader. There will be no more bootloader once we load the complied hex into chip. Then, Where is the hex file in arduino IDE after verfy(complied)?? The answer is in the file "preferences.txt" under :C:\Program Files\Arduino\lib .open it with word pad,