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A Rust embedded-hal HAL for all MCUs in the STM32 F4 family

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With latest Rust compiler, the USB example generates this warning: ``` | USB_BUS.replace(UsbBus::new(usb, &mut EP_MEMORY)); | ^^^^^^^^^^^^^^ mutable reference of mutable static | = note: for more information, see issue...

This allows a minimum time of 122µs and a maximum time of 32s, with a resolution of 61µs

I want to use hardware flow control in STM32F411's UART1. How do I configure the uart to use the associated pins PA11 and PA12 as CTS/RTS?

Right now, the spi in the HAL only implements `SpiBus`, which leaves the CS(NSS) management to user software. If the `SpiDevice` trait from `embedded_hal` is implemented, then the user don't...

This commit brings back the while-loop waiting at the end of the blocking read/write methods on I2C. The while-loop waiting is necessary to ensure that the I2C interface has become...

The implementation follows existing DMA abstraction for I2C interface. The implementation has been tested on STM32F407-Discovery board with the code in `examples/serial-dma.rs`.

with `embedded-hal` v1 the UART related traits have been removed in favour of [`embedded-io`](https://crates.io/crates/embedded-io). thus these traits should be implemented by this HAL so that the replacement for the old...

I'm using an STM32F411 chip via WeAct's Blackpill and am trying to read an analog input through one pin while outputting an unrelated PWM signal through another. The PWM signal...

During testing, I took example code `sd.rs` and launched it on my STM32F401RET Nucleo board. In debug mode it stuck on first read_block function call in debug mode, but works...

Closes #256 cc @jonasdn @ierturk