Windows only
Installing the DFU bootloader on Atmel AVR32 devices
This document describes the necessary steps to flash a DFU bootloader onto the AVR32 (AT32UC3C1512C) used on the Megafly autopilot. Note that all Atmel devices with USB support have the DFU bootloader already installed by default, however, a chip erase carried out with the JTAG will erase the bootloader, and it needs to be re-flashed if needed. To avoid removing the bootloader when using JTAG in Atmel Studio, go to Project -> Properties, and change "Programming Settings" to "Erase only program area".
1) Flashing the bootloader image
- connect your Megafly board to the JTAG cable which is in turn plugged to the JTAGICE3 programmer and debugger (in case of issues with its driver see here) which is in turn plugged to the computer, and check if it has power.
- Open Atmel Studio, go to Tools -> Device Programming.
- select JTAGICE3 tool (should be listed if connected properly), Device AT32UC3C1512C, Interface JTAG, and click Apply.
- to verify if the board is powered, click "Target Voltage". It should be above 3.0 V and not give and error.
- to verify if the chip is responding, click "Device information". If any of the above steps fail, check all cables and connections and repeat.
- Go to Tab "Memories"
- optional: Do a full chip erase
- under "Flash", select the bootloader image file <...>/MAVRIC/Utilities/Bootloader/BOOTLOADER_AT32UC3C1512.hex
- Program the flash
- under "Userpage", select the bootloader userpage file <...>/MAVRIC/Utilities/Bootloader/USERPAGE_BOOT_SDA1.hex
- Program the user page
- Go to Tab "Fuses"
- verify that "Auto Read" is enabled, or "Read" fuses from the AVR
- for BOOTPROT, select BOOTAREA_8KB
- Program
- You can unplug everything