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RCC_APB2_START |= RCC_REGISTER_IOF;
#define RCC_APB2_START (*(volatile unsigned int *)0x40021018)
#define RCC_REGISTER_IOF 0x00000080
#define GPIOF_START (*(volatile unsigned int *)0x40011c00)
#define GPIOF_CRL (*(volatile unsigned int *)(GPIOF_START+0x0))
#define GPIOF_CRH (*(volatile unsigned int *)(GPIOF_START+0x04))
#define GPIOF_OUTPUTDATA (*(volatile unsigned int *)(GPIOF_START+0x0c))
GPIOF_CRH = 0x33333333;
GPIOF_CRL = 0x33333333;
GPIOF_OUTPUTDATA=0xffffffff;