GEX port to STM32F072. This is currently the main port.
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gex-f072/GexUnits/usart/unit_usart.h

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//
// Created by MightyPork on 2018/01/02.
//
// USART driver using DMA buffers.
// Provides a wide range of config options and supports driving a RS485 driver.
//
// The implementation is complex and split to multiple files for easier maintenance
//
#ifndef GEX_F072_UNIT_USART_H
#define GEX_F072_UNIT_USART_H
#include "unit.h"
extern const UnitDriver UNIT_USART;
/**
* Write bytes. This function is asynchronous and does not wait for completion.
* It blocks until there's space in the Tx buffer for the data.
*
* @param unit
* @param buffer - bytes to send
* @param len - number of bytes to send
* @return success
*/
error_t UU_USART_Write(Unit *unit, const uint8_t *buffer, uint32_t len);
/**
* Write bytes. Same like UU_USART_Write(), except it waits for the transmission
* to complete after sending the last data.
*
* @param unit
* @param buffer - bytes to send
* @param len - number of bytes to send
* @return success
*/
error_t UU_USART_WriteSync(Unit *unit, const uint8_t *buffer, uint32_t len);
#endif //GEX_F072_UNIT_USART_H