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Updated LPC43xx USB DFU Notes (markdown)

sijskes
2014-09-22 02:15:30 -07:00
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LPC43xx-USB-DFU-Notes.md

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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](http://www.usb.org/developers/devclass_docs/DFU_1.1.pdf).
## Setup
### 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".)
### USB DFU Utility
http://dfu-util.gnumonks.org/
You need the latest source from git for some reason.
## Usage Notes
### 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.
### 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"):
> echo "0000000: da ff {blocksL} {blocksH} {hash0} {hash1} {hash2} {hash3}" | xxd -g1 -r > header.bin
where {blocksL} and {blocksH} are the low and high bytes of the length of the .bin file + 16 bytes, measured in 512-byte frames. "02 00" means 2 x 512 + 16 bytes. (this should be automated.)
Assume rounded up.
{hash0}..{hash3} = 0xFF. The value is not used, based on the HASH_ACTIVE field in the first two bytes.
Add header
> cat header.bin blinky.dfu > load.dfu
Check for device:
> /usr/local/bin/dfu-util -l
Download (I used the latest dfu-util from git)
> /usr/local/bin/dfu-util -d 1fc9:000c -a 0 -D load.dfu
Also make sure that the binary is linked for execution at address 0x00000000. This is the default for our linker scripts.
# Jellybean Notes
A 12 MHz clock signal must be supplied to the LPC4330 at boot time.
The April 16, 2012 Jellybean design has a voltage divider for VBUS that is fed to the LPC43xx to detect that a USB host is present. Measuring the divided voltage, the USB0_VBUS only reaches 0.4V, which fails to trip the USB bootloader code. It looks like NXP's intent is to directly connect VBUS to the USB0_VBUS. Indeed, when I shorted R10 with tweezers, the USB bootloader sprung into action. I would recommend changing R10 to 0 Ohms and R11 to DNP, or removing R10 and R11 altogether.
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](http://www.usb.org/developers/docs/devclass_docs/DFU_1.1.pdf).
## Setup
### 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".)
### USB DFU Utility
http://dfu-util.gnumonks.org/
You need the latest source from git for some reason.
## Usage Notes
### 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.
### 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"):
> echo "0000000: da ff {blocksL} {blocksH} {hash0} {hash1} {hash2} {hash3}" | xxd -g1 -r > header.bin
where {blocksL} and {blocksH} are the low and high bytes of the length of the .bin file + 16 bytes, measured in 512-byte frames. "02 00" means 2 x 512 + 16 bytes. (this should be automated.)
Assume rounded up.
{hash0}..{hash3} = 0xFF. The value is not used, based on the HASH_ACTIVE field in the first two bytes.
Add header
> cat header.bin blinky.dfu > load.dfu
Check for device:
> /usr/local/bin/dfu-util -l
Download (I used the latest dfu-util from git)
> /usr/local/bin/dfu-util -d 1fc9:000c -a 0 -D load.dfu
Also make sure that the binary is linked for execution at address 0x00000000. This is the default for our linker scripts.
# Jellybean Notes
A 12 MHz clock signal must be supplied to the LPC4330 at boot time.
The April 16, 2012 Jellybean design has a voltage divider for VBUS that is fed to the LPC43xx to detect that a USB host is present. Measuring the divided voltage, the USB0_VBUS only reaches 0.4V, which fails to trip the USB bootloader code. It looks like NXP's intent is to directly connect VBUS to the USB0_VBUS. Indeed, when I shorted R10 with tweezers, the USB bootloader sprung into action. I would recommend changing R10 to 0 Ohms and R11 to DNP, or removing R10 and R11 altogether.