GEX port to STM32F072. This is currently the main port.
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gex-f072/GexUnits/i2c/_i2c_internal.h

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//
// Created by MightyPork on 2018/02/03.
//
#ifndef GEX_F072_I2C_INTERNAL_H
#define GEX_F072_I2C_INTERNAL_H
#ifndef I2C_INTERNAL
#error bad include!
#endif
/** Private data structure */
struct priv {
uint8_t periph_num; //!< 1 or 2
uint8_t remap; //!< I2C remap option
bool anf; //!< Enable analog noise filter
uint8_t dnf; //!< Enable digital noise filter (1-15 ... max spike width)
uint8_t speed; //!< 0 - Standard, 1 - Fast, 2 - Fast+
I2C_TypeDef *periph;
};
/** Load from a binary buffer stored in Flash */
void UI2C_loadBinary(Unit *unit, PayloadParser *pp);
/** Write to a binary buffer for storing in Flash */
void UI2C_writeBinary(Unit *unit, PayloadBuilder *pb);
// ------------------------------------------------------------------------
/** Parse a key-value pair from the INI file */
error_t UI2C_loadIni(Unit *unit, const char *key, const char *value);
/** Generate INI file section for the unit */
void UI2C_writeIni(Unit *unit, IniWriter *iw);
// ------------------------------------------------------------------------
/** Allocate data structure and set defaults */
error_t UI2C_preInit(Unit *unit);
/** Finalize unit set-up */
error_t UI2C_init(Unit *unit);
/** Tear down the unit */
void UI2C_deInit(Unit *unit);
// ------------------------------------------------------------------------
#endif //GEX_F072_I2C_INTERNAL_H