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78 lines
2.6 KiB
78 lines
2.6 KiB
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where is the (optiboot) bootloader? Hex file is here:
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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:
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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.
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EDIT: also need fuse bits programmed or else this will not work.
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(external crystal is used, in uno.)
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TRAP #2: you need an external crystal (16MHz) in the avrdragon, AFTER programming
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the fuse bits. You can solder wires to another uno board's crystal
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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
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example there (note this is usbtiny)
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#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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EDIT: looks like sparkfun has incorrect information (or outdated).
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see arduino-1.8.5/hardware/arduino/avr/boards.txt
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for what arduino has for board values
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wrong entry (out of date):
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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)
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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.
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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
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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
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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
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(e.g. I had vcc/gnd header's gnd connected to ICSP #6, and then another GND to
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pin 8 on the third breakout. But this picture has only ISP #6 to 8 (omitting
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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
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into sketch). If you have it failed, from a blank atmega328p, it will
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go solid, then after a short while start to blink.
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I have a dedicated Avrdragon for programming optiboot onto atmega328p.
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makes things easy.
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WRONG CHIP:
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remember atmega328p-pu is the right chip
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atmega328-pu is wrong.
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You can program atmega328-pu, by changing avrdude paramters, or using
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-F
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In this case, I changed atmega328p to atmega328 to reflect that I had the
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incorrect chip
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