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oresat / oresat-firmware

OreSat firmware based on ChibiOS for M0 and M4 microcontrollers
GNU General Public License v3.0
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Add project CRC support library for STM32 CRC hardware #47

Closed heliochronix closed 3 months ago

heliochronix commented 3 years ago

Instead of having a bunch of individual CRC code files for different CRC implementations, create a support library that leverages the built-in CRC hardware on STM32 devices.

In particular, the polynomial on F091 devices is configurable, so it can be used to implement the CRC-16-CCITT used in subsystems like CANopen or CRC-32 used in firmware image checks.

For non-configurable devices, provide polynomial implementations for several common profiles that are not supported, but consolidate both into a single library for the project.

ThirteenFish commented 3 months ago

The CRC library in common/crc.c appears to do hardware accelerated CRC with a bit of coaxing. See for example app_bootlader's halconf.h which makes use of it.