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MANUFACTURING.md

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Dronecode Probe manufacturing

Please open a ticket or reach [email protected] if questions arise.

Prerequisites

The instructions below assume that the host computer is running a Linux-based OS.

Installing dependencies

Debian-based systems

The following APT packages must be installed:

  • python-yaml
  • python-usb

Also, the ARM GCC toolchain must be installed in order to build the firmware and test the board with GDB. The toolchain is available from https://launchpad.net/gcc-arm-embedded, or from an APT package gcc-arm-none-eabi. Recommended GCC version is 7.2.

Assembling

See the assembly drawing in PDF available in this repo. All components are reflow-solderable.

Keep in mind that certain components are explicitly marked as not to be installed.

Getting the firmware

Get the sources from https://github.com/blacksphere/blackmagic and build them. The output will contain the following two files (among others):

  • blackmagic_dfu.bin - the USB DFU bootloader.
  • blackmagic.bin - the main firmware.

Prebuilt binaries can be found here: https://files.zubax.com/products/dronecode_probe.

The following comands can be used to create a loadable ELF from a flat binary:

arm-none-eabi-objcopy -I binary -O elf32-little --change-section-address .data=0x08000000 blackmagic_dfu.bin blackmagic_dfu.elf

Flashing the DFU bootloader

Flash the DFU bootloader image using one of the methods below.

Using the STM32 serial bootloader

  1. Using tweezers, close the jumper BOOT0 and connect the board to USB (note that the jumper itself is marked as not to be installed). The microcontroller will start the embedded bootloader, accessible via the serial port. Once the board is powered, the tweezers can be removed.

  2. Using any available STM32 serial bootloader tool, load the DFU bootloader image onto the board at zero offset (i.e. 0x08000000, which is the address of flash). It is advised to use the following tool for flashing: https://github.com/Zubax/zubax_serial_updater.

  3. Disconnect the board from USB.

Using JTAG/SWD

  1. Connect the target board to the computer via USB; connect its SWD pins to any other SWD adapter (e.g., another Dronecode Probe). The SWD signals are marked on the bottom side of the board: SWD, GND, SWC, 5V. Note that the pin marked 5V is the target voltage sensing pin (not a power supply input).

  2. Using any of the available tools, flash the DFU bootloader image at 0x08000000 (i.e., at the start of the flash memory).

  3. Disconnect the board from USB.

Flashing the main firmware

Connect the board to USB while holding the button BOOT. All LEDs on the board should start blinking alernately. The system will report the device as follows:

$ sudo dmesg
usb 3-1.4.1: new full-speed USB device number 16 using xhci_hcd
usb 3-1.4.1: New USB device found, idVendor=1d50, idProduct=6017
usb 3-1.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 3-1.4.1: Product: Black Magic Probe (Upgrade)
usb 3-1.4.1: Manufacturer: Black Sphere Technologies
usb 3-1.4.1: SerialNumber: 7ECB8AC5

Then go to the directory with firmware sources and execute the following script:

sudo dfu-util -d 1d50:6017 -s 0x08002000:leave -R -D src/blackmagic.bin

The following information will be reported in the console:

Opening DFU capable USB device...
ID 1d50:6017
Run-time device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 011a
Device returned transfer size 1024
DfuSe interface name: "Internal Flash   "
Downloading to address = 0x08002000, size = 120004
Download	[=========================] 100%       120004 bytes
Download done.

Disconnect the board afterwards.

Alternative instructions for this step are available from https://github.com/blacksphere/blackmagic/wiki/Upgrading-Firmware.

Testing

Disconnect the newly flashed board from USB, then connect again. The system will detect a new CDC-ACM device:

$ dmesg
usb 3-1.4.1: new full-speed USB device number 19 using xhci_hcd
usb 3-1.4.1: New USB device found, idVendor=1d50, idProduct=6018
usb 3-1.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 3-1.4.1: Product: Black Magic Probe
usb 3-1.4.1: Manufacturer: Black Sphere Technologies
usb 3-1.4.1: SerialNumber: 7ECB8AC5
cdc_acm 3-1.4.1:1.0: ttyACM0: USB ACM device
cdc_acm 3-1.4.1:1.2: ttyACM1: USB ACM device

Connect the board to a target (e.g. another unflashed Dronecode Probe, as described in one of the steps above) and try to load its firmware using GDB. For example, start arm-none-eabi-gdb providing path to the ELF, and execute the following commands in the internal command prompt:

tar ext /dev/ttyACM0    # Or another port
mon swdp_scan
attach 1
load
kill