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- where is the (optiboot) bootloader? Hex file is here:
- arduino-1.8.5/hardware/arduino/avr/bootloaders/optiboot_atmega328.hex
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- ref: https://forum.arduino.cc/index.php?topic=125622.0
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- example cmd:
- avrdude -c dragon_isp -P usb -p atmega328p -U flash:w:main.hex:i
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- ref: https://forum.arduino.cc/index.php?topic=350727.0
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- HOWEVER THAT IS WRONG. TRAP.
-
- EDIT: also need fuse bits programmed or else this will not work.
- (external crystal is used, in uno.)
- TRAP #2: you need an external crystal (16MHz) in the avrdragon, AFTER programming
- the fuse bits. You can solder wires to another uno board's crystal
- with the chip removed, if you don't have a 16MHz piece of quartz around.
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- see https://learn.sparkfun.com/tutorials/installing-an-arduino-bootloader
- example there (note this is usbtiny)
- #avrdude -b 19200 -c dragon_isp -p m328p -v -e -U efuse:w:0x05:m -U hfuse:w:0xD6:m -U lfuse:w:0xFF:m
- EDIT: looks like sparkfun has incorrect information (or outdated).
- see arduino-1.8.5/hardware/arduino/avr/boards.txt
- for what arduino has for board values
- wrong entry (out of date):
- avrdude -b 19200 -c dragon_isp -p m328p -v -e -U efuse:w:0x05:m -U hfuse:w:0xD6:m -U lfuse:w:0xFF:m
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- correct entry: (efuse must be 0xFD, as the reserved high bits must be set as 1's)
- avrdude -b 19200 -c dragon_isp -p m328p -v -e -U efuse:w:0xFD:m -U hfuse:w:0xDE:m -U lfuse:w:0xFF:m
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- below are fuse bits. These should be used as well.
- avrdude -b 19200 -c dragon_isp -p m328p -v -e -U flash:w:hexfilename.hex -U lock:w:0x0F:m
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- see also
- http://www.martyncurrey.com/arduino-atmega-328p-fuse-settings/
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- Get a good ziff socket for the dragon.
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- Notice that the first header is VCC/GND breakout, the second is ICSP, and the
- third is directly tied to ZIFF socket.
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- Also notice that JTAG and HV_PRG are not connected.
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- My dragon was already setup for this, though some extra gnds were connected
- (e.g. I had vcc/gnd header's gnd connected to ICSP #6, and then another GND to
- pin 8 on the third breakout. But this picture has only ISP #6 to 8 (omitting
- the ground loop). Possibly either will work. I know mine works.
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- You can watch the leds on the uno to see if it's working.
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- if you do it correctly, LED 13 lights up with optiboot, then goes blank (or
- into sketch). If you have it failed, from a blank atmega328p, it will
- go solid, then after a short while start to blink.
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- I have a dedicated Avrdragon for programming optiboot onto atmega328p.
- makes things easy.
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-
- WRONG CHIP:
- remember atmega328p-pu is the right chip
- atmega328-pu is wrong.
- You can program atmega328-pu, by changing avrdude paramters, or using
- -F
-
- In this case, I changed atmega328p to atmega328 to reflect that I had the
- incorrect chip
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