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FOURTEEN
LPC43XX USB DFU NOTES
The LPC43xx contains USB DFU bootloader support in ROM. By selecting the appropriate boot mode (USB0), the
device will come up on USB at power-up or reset, and implement the popular and well-documented USB DFU protocol.
14.1 Setup
14.1.1 Boot Mode Jumpers
Set the boot mode jumpers to USB0: BOOT[0:3] = “1010”. Jumper setting takes effect at the next power-on or reset.
(You can rig up a reset button to P2 “LPC_JTAG” or P14 “LPC_ISP”.)
14.1.2 USB DFU Utility
http://dfu-util.gnumonks.org/
You need the latest source from git for some reason.
14.2 Usage Notes
14.2.1 Makefile
The firmware Makefile contains a “%.dfu” and a “program” target. The program target will make the DFU file and
then attempt to load the code to a device that’s attached via USB and in DFU mode.
14.2.2 Manually
DFU boot downloads to RAM then executes. Need a DFU suffix, but also a header
cp blinky.bin blinky.dfu
Add DFU suffix and address prefix:
/usr/local/bin/dfu-suffix --pid=0x000c --vid=0x1fc9 --did=0x0 -s 0 -a blinky.dfu
Create header (based on UM10503 section 5.3.3 “Boot image header format”):
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