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/* (4) */
GPIO_WriteBit(GPIOC , GPIO_Pin_9 , (ledval) ? Bit_SET : Bit_RESET);
ledval = 1 - ledval;

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/* (3) */
if (SysTick_Config(SystemCoreClock / 1000))
while (1);

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/* (5) */
static __IO uint32_t TimingDelay;
void Delay(uint32_t nTime){
TimingDelay = nTime;
while(TimingDelay != 0);
}
void SysTick_Handler(void){
if (TimingDelay != 0x00)
TimingDelay --;

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RCC_APB1PeriphClockCmd(uint32_t RCC_APB1PERIPH , FunctionalState NewState);
RCC_APB2PeriphClockCmd(uint32_t RCC_APB2PERIPH , FunctionalState NewState);
RCC_AHBPeriphClockCmd(uint32_t RCC_AHBPERIPH ,  FunctionalState NewState);

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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB , ENABLE);

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// see stm32f10x_gpio.h
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_StructInit (& GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOC , &GPIO_InitStructure);

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GPIO_WriteBit(GPIOC , GPIO_Pin_9 , x); // x is Bit_SET or Bit_RESET

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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA , &GPIO_InitStructure);

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GPIO_ReadInputDataBit(GPIOA , GPIO_Pin_0);

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typedef struct
{
  volatile uint32_t CRL;
  volatile uint32_t CRH;
  volatile uint32_t IDR;
  volatile uint32_t ODR;
  volatile uint32_t BSRR;
  volatile uint32_t BRR;
  volatile uint32_t LCKR;
} GPIO_TypeDef;