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90 lines
3.6 KiB
Markdown
90 lines
3.6 KiB
Markdown
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This document describes how to build the FPGA bitstream, including the
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firmware, and get this programmed onto the flash memory of the
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Tillitis Key 1 USB device.
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The Tillitis Key 1 kit includes:
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- Tillitis Key 1 USB stick with USB-C plug, marked MTA1-USB V1
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- Programmer board based on Raspberry Pi Pico, with a white holder/jig
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- USB cable with micro-B plug, for connecting the programmer to
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computer
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- USB-C extension cable
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- USB-C to USB-A adapter
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# Programming FPGA bitstream and firmware onto Tillitis Key 1
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Connect the programmer to the computer using the USB cable with
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micro-B plug.
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Place the Tillitis Key 1 (the USB stick) correctly in the programming
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jig and close the hatch.
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The USB stick can remain in the jig during repeated development,
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programming and testing cycles. The USB stick should then be connected
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to the computer using the provided USB-C cable (use the USB-C-to-A
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adapter if needed). The jig also has a cutout to allow touching where
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the touch sensor is located (next to the LED). Note that connecting
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the USB stick to the computer is not required for programming it. Note
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also that with this setup, to reset the USB stick back to firmware
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mode after loading an app, you need to unplug both the USB cable to
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the stick and the one to the programmer.
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On Linux, `lsusb` should list the connected programmer as `cafe:4004
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Blinkinlabs ICE40 programmer`. If the USB stick is also connected it
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shows up as `1207:8887 Tillitis MTA1-USB-V1`.
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To install the software needed for building and programming, please
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refer to [toolchain_setup.md](toolchain_setup.md).
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You are now ready to generate the FPGA bitstream (including building
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the standard firmware) and program it onto the flash memory of the USB
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stick. The following should be run as your regular non-root user, but
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the programming is currently done using `sudo` (so sudo is expected to
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be set up for your user; the Makefile runs `sudo tillitis-iceprog …`).
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```
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$ git clone https://github.com/tillitis/tillitis-key1
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$ cd tillitis-key1/hw/application_fpga
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$ make prog_flash
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```
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After programming, the Tillitis Key 1 USB stick can be connected to
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your computer (use the USB-C-to-A adapter if needed) and will boot the
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firmware. When boot has completed it will start flashing the LED
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white. This indicates that it is ready to receive and measure an app.
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To try out an app, continue to the README.md the apps repo:
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https://github.com/tillitis/tillitis-key1-apps#readme
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To learn more about the concepts and workings of the firmware, see:
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[system_description/system_description.md](system_description/system_description.md)
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and [system_description/software.md](system_description/software.md).
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# Device personalization
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To personalize Tillitis Key 1, you need to modify the hex file that
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contains the Unique Device Secret (UDS). You should also update the
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Unique Device Identity (UDI). These hex files are located in
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`hw/application_fpga/data/`. Note that after modify the files in this
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directory, you need to rebuild and program the device again (as
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above).
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To make this easier there is a tool that can generate these files. The
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tool can be found in `hw/application_fpga/tools/tpt`. The tool allow
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you to supply a secret used as part of the UDS generation. The tool
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can be run interactively, or by suppling inputs on the command line:
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```
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usage: tpt.py [-h] [-v] [--ent ENT] [--vid VID] [--pid PID] [--rev REV] [--serial SERIAL]
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options:
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-h, --help show this help message and exit
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-v, --verbose Verbose operation
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--ent ENT User supplied entropy
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--vid VID Vendor id (0 - 65535)
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--pid PID Product id (0 - 2555
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--rev REV Revision number (0 - 15)
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--serial SERIAL Serial number (0 - (2**31 - 1))
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```
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