Added LED status code for default USB power
It's useful to know when only default USB power is available, as opposed to when some mechanism for negotiating higher power is available but it isn't possible to get high enough power. This can let users know e.g. using a USB A to C cable can't provide high power, potentially reducing confusion. The blink code for this is 1 7/8 s on, 1/8 s off. I think this is sufficiently unlike other blink patterns that it won't cause any confusion.
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This is the firmware for the PD Buddy Sink, a smart power jack for USB Power Delivery.
To compile the firmware, you must first install the GNU ARM Embedded Toolchain. Details of its installation is beyond the scope of this README. Once the toolchain is installed, clone this repository with:
$ git clone --recursive http://git.clayhobbs.com/pd-buddy/pd-buddy-firmware.git
This will give you a complete copy of the repository, including the ChibiOS submodule.
You will also need to install some program to flash the firmware. The simplest option is dfu-util, as it requires no extra hardware (though if upgrading from versions older than 1.2.0, either the Boot switch must be installed or two pads must be bridged). If you prefer to use SWD, you could also use stlink, OpenOCD, or a Black Magic Probe.
With all the dependencies installed, the firmware can be compiled as follows:
$ cd pd-buddy-firmware $ make
This compiles the firmware to
The firmware can be flashed in any number of ways, including but not limited to the following:
To flash via DfuSe (ST Microelectronics’s extended version of the standard USB DFU protocol), the Sink must first be put into DFU mode. If upgrading from a version older than 1.2.0, or if no firmware is installed, set the Boot switch (SW1) on the PD Buddy Sink to the position not marked on the silkscreen to set the device to DFU mode. If your Sink doesn’t have a Boot switch installed, you can simply bridge the two pads of SW1 circled in this image with a blob of solder to achieve the same effect. Once this Sink is set to DFU mode, plug it into your computer.
If upgrading from firmware version 1.2.0 or later, you can easily enter DFU mode by running the following command from the Sink’s configuration shell:
This immediately puts the Sink in DFU mode until it is reset or unplugged.
When the Sink is in DFU mode, the Status LED should be glowing dimly. The firmware can then be flashed with:
$ dfu-util -a 0 -s 0x08000000:leave -D build/pd-buddy-firmware.bin
If this fails with a message like “dfu-util: Cannot open DFU device 0483:df11”, it’s likely that you don’t have permissions to write to the device. Try running dfu-util as root if this is the case.
If applicable, don’t forget to set the switch back to normal mode (or remove the solder blob) after unplugging the device.
If you have an ST-LINK/V2, you can use it to flash the firmware via SWD as follows:
$ st-flash write build/pd-buddy-firmware.bin 0x8000000
OpenOCD can also be used to flash the firmware. If your debug probe is an ST-LINK/V2, you can easily do this as follows:
$ make flash-openocd-stlink
Black Magic Probe debuggers can be used to flash the firmware as well. This can be easily done as follows:
$ make flash-bmp
After first flashing the PD Buddy Sink, the device has no configuration. To configure it, plug it into your computer while holding the “Setup” button. The LED should blink once per second to indicate that the device is in configuration mode. There are then two ways to configure the Sink: a serial terminal, or the configuration GUI.
Connect to the PD Buddy Sink with your favorite serial console program, such as
GNU Screen, Minicom, or PuTTY. Press Enter, and you should be
greeted with a
PDBS) prompt. The
help command gives brief summaries of
each of the available commands.
For example, to configure the PD Buddy Sink to request 2.25 A at 20 V, run the following commands:
PDBS) set_v 20000 PDBS) set_i 2250 PDBS) write
write is run, the chosen settings are written to flash. You can then
simply disconnect the Sink from your computer.
For more information about the serial console configuration interface, refer to the full documentation.
The Sink can also be configured by the PD Buddy Configuration GUI. For more information, see that repository’s README.
Once the Sink has been configured, just plug it into your USB PD power supply. If the supply is capable of putting out the configured current at the configured voltage, the Sink will negotiate it, then turn on its output and blink the LED three times to indicate success. If the supply cannot output enough power, the Sink will turn its LED on solid to indicate failure, and leave its output turned off.
|Fast blink (4 blink/sec)||Sink||Negotiating USB Power Delivery contract|
|Medium blink (2 blink/sec)||Sink||USB Power Delivery contract established, output on|
|On||Sink||Unable to get configured power from source|
|Long blink (1 blink/2 sec)||Sink||Only default USB power is available (e.g. powered with USB A to C cable)|
|Slow blink (1 blink/sec)||Setup||Running in setup mode|
|Fast blink (4 blink/sec)||Setup||