PureThermal 1 Reference Firmware
The PureThermal 1 is an embedded development platform for the FLIR Lepton thermal imager, created by GroupGets Labs. It is based around the STM32F4, a powerful ARM Cortex-M MCU by ST Microelectronics, and its various IO capabilities and open source firmware to make it easy integrate a FLIR Lepton into any environment.
Purpose of This Project
It is intended that you use this firmware as a starting point for you own applications. For many applications where you wish to process thermal image data on a host PC, you can probably use pre-built binaries of this firmware and use as-is. For others, forking this project and making your own modifications to this firmware is encouraged.
Building the Firmware
This is a Makefile-based project, and we use the GCC ARM Embedded toolchain from https://launchpad.net/gcc-arm-embedded/+download, however, other toolchains that work for the STM32 (such as Mentor's Sourcery toolchain) should also work.
The following are compiler installation instructions for various platforms, required for building the firmware.
Ubuntu 10.04/12.04/14.04/14.10 32/64-bit
sudo add-apt-repository ppa:terry.guo/gcc-arm-embedded sudo apt-get update sudo apt-get install gcc-arm-none-eabi
Launchpad has toolchain binaries for OS X. To keep things simple, we'll install then into
sudo mkdir -p /usr/local curl -L https://launchpad.net/gcc-arm-embedded/4.9/4.9-2015-q3-update/+download/gcc-arm-none-eabi-4_9-2015q3-20150921-mac.tar.bz2 -o ~/Downloads/gcc-arm-embedded.tar.bz2 sudo tar xjf ~/Downloads/gcc-arm-embedded.tar.bz2 -C /usr/local && rm ~/Downloads/gcc-arm-embedded.tar.bz2
Then you need to add this location to your path. Add to your .bashrc, or every time you open a new shell and wish to build execute:
Clone and Build
git clone https://github.com/groupgets/purethermal1-firmware cd purethermal1-firmware
If you wish, you can modify
Src/project_config.h to customize your build. Then you can simply build:
alternatively, you can enable semihosting support to printf over JTAG/SWD:
See the "Debugging" section below for more information.
If you have OpenOCD installed (available in most package management systems), you can then flash the compiled firmware (see next section for required hardware):
Installing Release Firmware
Old instructions for flashing PureThermal 1 over USB (warning: this only works on early PureThermal 1 devices).
- ARM MCU JTAG Adapter for PureThermal 1
- PureThermal 1 - FLIR Lepton Smart I/O Module
- Micro USB Cable
- Attach ribbon cable from STLINK/V2 into ARM Adapter.
- Plug in ribbon cable from ARM Adapter into PureThermal1's ZIF socket.
- Insert mini-usb cable into STLINK/V2 and computer.
- Insert micro-usb cable into PureThermal 1 and computer.
- Power on PureThermal 1 if not already on with ON/OFF button press.
In terminal download and install the STLink software using homebrew:
brew install stlink
Navigate to the folder which contains the PureThermal 1 firmware (pt1-vx.xx.x.bin or pt1-vx.xx.x+Y16), or build with the instructions above.
Use the following command to erase the firmware on the PureThermal 1:
To write the firmware use one of the following commands (replace the X's with the version of firmware you have downloaded):
st-flash --reset write pt1-vX.XX.X.bin 0x08000000
st-flash --reset write pt1-vX.XX.X+Y16.bin 0x08000000
Output of a Makefile build:
st-flash --reset write main.bin 0x08000000
- See the texane/stlink github page for detailed instructions for various Linux distributions.
- Download the STM32 ST-LINK Utility (STSW-LINK004)
- Install STM32 ST-Link Utility and then open the software.
- Select "Target" then "Connect" to connect the software to the PureThermal 1.
- Next select "File" then "Open file...", now navigate to the folder which contains the PureThermal 1 firmware and select & open the firmware you want to flash (pt1-vX.XX.X.bin or pt1-vX.XX.X+Y16).
- Finally click "Target" then "Program & Verify...", make sure that the "Reset after programming" box is selected then press the "Start" button.
This section covers
printf over JTAG/SWD though GDB semihosting. You can also set breakpoints using GDB+OpenOCD,
or with using the provided Eclipse projects. Additionally, you can enable printf support over UART.
For Makefile projects, you can enable semihosting support to enable printf over JTAG/SWD. This works with STLink/V2, Segger JLink, and should work with others as well.
You must build the code with semihosting support enabled (GDB_SEMIHOSTING=1). Note that if you get build errors,
you might have to
make clean and retry. Simply run the following:
GDB_SEMIHOSTING=1 make debug
The debugger should remain attached, and you should see printf output on the console, like so:
... xPSR: 0x01000000 pc: 0x08010b8c msp: 0x20020000 semihosting is enabled auto erase enabled Info : device id = 0x10006431 Info : flash size = 512kbytes wrote 131072 bytes from file main.bin in 4.133242s (30.968 KiB/s) adapter speed: 2000 kHz Info : JTAG tap: stm32f4x.cpu tap/device found: 0x4ba00477 (mfg: 0x23b (ARM Ltd.), part: 0xba00, ver: 0x4) Info : JTAG tap: stm32f4x.bs tap/device found: 0x06431041 (mfg: 0x020 (STMicroelectronics), part: 0x6431, ver: 0x0) Hello, Lepton! reading_tmp007_regs... Initialized...
Semihosting also works in Eclipse/OpenSTM32 projects. To enable this, locate the target debug configuration for the project and add the following line to Initialization Commands in the Startup tab:
monitor arm semihosting enable
You should see print statements appear in the debugger console view.
For More Information
Refer to PureThermal 1 development wiki.
Licensing and Support
This firmware is licensed under The MIT License (MIT), see
LICENSE file for details.
Inquiries for support should be directed at this project's maintainers, GroupGets, LLC (GroupGets), and not FLIR Systems, Inc. (FLIR). Additional FLIR-provided source code is being released by GroupGets to this project under the express written consent of FLIR, and covered by the project's license, with the expectation that no warranties or support of any kind will be provided by FLIR.