#include "registers.h"
#undef GPIOB
#undef RCC
#undef I2C1
extern GPIO_TypeDef b;extern RCC_TypeDef r;extern I2C_TypeDef i;
#define GPIOB (&b)
#define RCC (&r)
#define I2C1 (&i)
#define __DSB() ((void)0)
