嵌入式stm32 LED 流水灯剖析（库函数版）

基于stm32 F401 discovery 库函数点亮LED 3,4,5,6

一.附原理图一张：

分别对应的GPIO为PD12，PD13，PD14，PD15

二.Memory and bus architecture 

#define PERIPH_BASE          ((uint32_t)0x40000000) /*!< Peripheral base address in the aliasregion 

#define APB1PERIPH_BASE      PERIPH_BASE

#define APB2PERIPH_BASE      (PERIPH_BASE + 0x00010000)

#define AHB1PERIPH_BASE      (PERIPH_BASE + 0x00020000)

#define AHB2PERIPH_BASE      (PERIPH_BASE + 0x10000000)

GPIOD在AHB1中，通过

#define GPIOD_BASE            (AHB1PERIPH_BASE + 0x0C00)

三.关键代码附上:

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured,
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f401xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
        system_stm32f4xx.c file
     */
  GPIO_InitTypeDef  GPIO_InitStructure;

  /* GPIOD Periph clock enable */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

  /* Configure PD12, PD13, PD14 and PD15 in output pushpull mode */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  while (1)
  {
    /* PD12 to be toggled */
    GPIO_SetBits(GPIOD, GPIO_Pin_12);

    /* Insert delay */
    Delay(0x3FFFFF);

    /* PD13 to be toggled */
    GPIO_SetBits(GPIOD, GPIO_Pin_13);

    /* Insert delay */
    Delay(0x3FFFFF);

    /* PD14 to be toggled */
    GPIO_SetBits(GPIOD, GPIO_Pin_14);

    /* Insert delay */
    Delay(0x3FFFFF);

    /* PD15 to be toggled */
    GPIO_SetBits(GPIOD, GPIO_Pin_15);

    /* Insert delay */
    Delay(0x7FFFFF);

    GPIO_ResetBits(GPIOD, GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);

    /* Insert delay */
    Delay(0xFFFFFF);
  }
}

代码工程资源链接：

http://download.csdn.net/detail/xiaoxiaopengbo/9418874

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