/**************************************************************
**  精英STM32開發(fā)板
**  版本：V1.0
**  功能：LED循環(huán)閃爍
***************************************************************/

/* Includes ------------------------------------------------------------------*/
#define SYS_GLOBALS
#include "include.h"


#define u16  unsigned short
#define u32  unsigned long


/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void NVIC_Configuration(void);
void GPIO_Configuration(void);

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

//LED循環(huán)閃爍
void LedFlash(void)
{
  static u16 leds = 0x01;
  u16 temp;
    
    //先讀出PC端口狀態(tài)
    temp = GPIO_ReadInputData(GPIOC);
    
    //先屏蔽掉PC0~PC2
    temp |= 0x0007;
    
    //重新設置PC0~PC2輸出狀態(tài)，IO輸出低電平點亮LED
    temp &= (~(leds));
    GPIO_Write(GPIOC, temp);
    leds <<= 1;
    if ( (leds&0x0f) == 0)
	     leds = 0x01;
}

//軟件延時程序，不是精確的延時
void Delay(u32 time)
{u32 i,j;
  
	for(j=0; j<time; j++)
	{
	   for(i=0;i<12000;i++);
	}
}

/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif

  /* System Clocks Configuration */
  RCC_Configuration();//配置系統(tǒng)時鐘   

  GPIO_Configuration();//配置GPIO

  /* NVIC configuration */
  NVIC_Configuration();//配置中斷
  
  //關閉所有LED
  GPIO_Write(GPIOC, GPIO_ReadInputData(GPIOC)|0x00000007);
  Delay(20);
  
  while (1)
  {
     Delay(50);
	   
	   //循環(huán)顯示1位LED
	   LedFlash();
	   
	   Delay(50);
	   
	   //關閉所有LED
	   GPIO_Write(GPIOC, GPIO_ReadInputData(GPIOC)|0x00000007);
  }
}

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{ErrorStatus HSEStartUpStatus;
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);//使能外部時鐘 

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();//等待外部時鐘就緒

  if(HSEStartUpStatus == SUCCESS)
  {
    /* Enable Prefetch Buffer 啟用預取緩沖器 */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 2 wait state FLASH設置2個等待周期*/
    FLASH_SetLatency(FLASH_Latency_2);
 
    /* HCLK = SYSCLK 設置系統(tǒng)設置*/
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK PCLK2時鐘=主時鐘*/
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 PCLK1時鐘為主時鐘1/2*/
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* PLLCLK = 8MHz * 9 = 72 MHz 設置時鐘為72M*/
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    /* Enable PLL 使能PLL*/ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready 等待PLL工作穩(wěn)定*/
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source 選擇PLL做為系統(tǒng)時鐘源*/
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source 準備就緒，開始干活*/
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  /* Enable GPIO_LED clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);//使能GPIO時鐘
  //LED_init-------------------------------------------------------
  ////配置管腳
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//最大輸出速度為50MHz
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;////通用推挽輸出
  GPIO_Init(GPIOC, &GPIO_InitStructure);			 //設置GPIO為輸出
  
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
//#ifdef  VECT_TAB_RAM
#if defined (VECT_TAB_RAM)
  /* Set the Vector Table base location at 0x20000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); //設置中斷向量在RAM中
//#elif defined(VECT_TAB_FLASH_IAP)
//  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x2000);
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); //設置中斷向量在FLASH中  
#endif 
}




#ifdef  DEBUG
/*******************************************************************************
* Function Name  : assert_failed
* Description    : Reports the name of the source file and the source line number
*                  where the assert_param error has occurred.
* Input          : - file: pointer to the source file name
*                  - line: assert_param error line source number
* Output         : None
* Return         : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/