This project is inspired by OpenLog.

Why do something new? To attain higher rates! The openlager hardware can accept data at high rates using slave SPI or fast async serial. It uses a 4-wide SDIO interface to the card to support higher peak logging rates. And the reasonable amount of memory buffer on the STM32F411 lets us ride out times when the SD card is busy erasing or doing other housekeeping without losing data.

The openlager hardware design and firmware are produced by the dRonin project, which produces high-quality flight controller software for drone racing and autonomous flight. To log everything that's happening in a lossless fashion, high rate logs are required. But we anticipate it being useful for a wide variety of applications.

The openlager hardware in hardware/ is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0), as contained in hardware/LICENSE.txt

The openlager firmware in src/ is licensed under a simplified BSD license as found in src/LICENSE.txt

The fatfs library in libs/fatfs is licensed under the one-clause BSD license as found in the source files in that directory.

The STM32F4xx_StdPeriph_Driver library in libs/STM32F4xx_StdPeriph_Driver is largely licensed under a restrictive license that limits its usage to ST family processors. To use this software on non-ST parts, the dependency on this library code must be removed. Portions of this code (the core_cm* include headers) are licensed under a permissive 3 clause BSD license from ARM, as noted in the individual files.