/* SYSTEM CONTROL REGISTER */
#define SYSCTRL_RCC MEM_ADDR(0x40021000)
#define RCC_APB1ENR MEM_ADDR(0x4002101C) // register to enable I2C
/* SYSTEM CONTROL REGISTER */
#define SYSCTRL_RCC MEM_ADDR(0x40021000)
#define RCC_APB1ENR MEM_ADDR(0x4002101C) // register to enable I2C