stm32-hal
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STM32F4 USART Support
I noticed that the USART support for stm32f4 is somewhat limited as it doesn't cover interrupts or dma transfers. The information is buried at the very end of the repository readme, in the errata section. I think interrupts / dma are essential for any real project and might be a deal breaker for stm32-hal (if one has to work with stm32f4).