main.c

STM32 库文件

/**
  ******************************************************************************
  * @file IWDG/main.c 
  * @author  MCD Application Team
  * @version  V3.0.0
  * @date  04/06/2009
  * @brief  Main program body.
  ******************************************************************************
  * @copy
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "platform_config.h"

/** @addtogroup StdPeriph_Examples
  * @{
  */

/** @addtogroup IWDG_Example
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
ErrorStatus HSEStartUpStatus;

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

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

/**
  * @brief  Main program.
  * @param  None
  * @retval : None
  */
int main(void)
{
  /* System Clocks Configuration */
  RCC_Configuration();

  /* GPIO configuration */
  GPIO_Configuration();

  /* Check if the system has resumed from IWDG reset */
  if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET)
  {
    /* IWDGRST flag set */
    /* Set GPIO_LED pin 6 */
    GPIO_SetBits(GPIO_LED, GPIO_Pin_6);

    /* Clear reset flags */
    RCC_ClearFlag();
  }
  else
  {
    /* IWDGRST flag is not set */
    /* Reset GPIO_LED pin 6 */
    GPIO_ResetBits(GPIO_LED, GPIO_Pin_6);
  }

  /* Configure Key Button EXTI Line to generate an interrupt on falling edge */
  EXTI_Configuration();

  /* NVIC configuration */
  NVIC_Configuration();

  /* Configure SysTick to generate an interrupt each 250ms */
  SysTick_Configuration();

  /* IWDG timeout equal to 280 ms (the timeout may varies due to LSI frequency
     dispersion) */
  /* Enable write access to IWDG_PR and IWDG_RLR registers */
  IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);

  /* IWDG counter clock: 40KHz(LSI) / 32 = 1.25 KHz */
  IWDG_SetPrescaler(IWDG_Prescaler_32);

  /* Set counter reload value to 349 */
  IWDG_SetReload(349);

  /* Reload IWDG counter */
  IWDG_ReloadCounter();

  /* Enable IWDG (the LSI oscillator will be enabled by hardware) */
  IWDG_Enable();

  while (1)
  {}
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval : None
  */
void RCC_Configuration(void)
{
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if (HSEStartUpStatus == SUCCESS)
  {
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 0 wait state */
    FLASH_SetLatency(FLASH_Latency_0);

    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1);

    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1);

    /* PCLK1 = HCLK */
    RCC_PCLK1Config(RCC_HCLK_Div1);

    /* Select HSE as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);

    /* Wait till HSE is used as system clock source */
    while (RCC_GetSYSCLKSource() != 0x04)
    {}
  }

  /* Enable Key Button GPIO Port, GPIO_LED and AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIO_KEY_BUTTON | RCC_APB2Periph_GPIO_LED
                         | RCC_APB2Periph_AFIO, ENABLE);
}

/**
  * @brief  Configures the different GPIO ports.
  * @param  None
  * @retval : None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Configure GPIO_LED pin 6 and pin 7 as Output push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIO_LED, &GPIO_InitStructure);

  /* Configure Key Button GPIO Pin as input floating (Key Button EXTI Line) */
  GPIO_InitStructure.GPIO_Pin = GPIO_PIN_KEY_BUTTON;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIO_KEY_BUTTON, &GPIO_InitStructure);
}

/**
  * @brief  Configures EXTI Line9.
  * @param  None
  * @retval : None
  */
void EXTI_Configuration(void)
{
  EXTI_InitTypeDef EXTI_InitStructure;

  /* Connect Key Button EXTI Line to Key Button GPIO Pin */
  GPIO_EXTILineConfig(GPIO_PORT_SOURCE_KEY_BUTTON, GPIO_PIN_SOURCE_KEY_BUTTON);

  /* Configure Key Button EXTI Line to generate an interrupt on falling edge */
  EXTI_ClearITPendingBit(EXTI_LINE_KEY_BUTTON);
  EXTI_InitStructure.EXTI_Line = EXTI_LINE_KEY_BUTTON;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
}

/**
  * @brief  Configure the nested vectored interrupt controller.
  * @param  None
  * @retval : None
  */
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* Configure one bit for preemption priority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

  /* Enable the EXTI9_5 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

}

/**
  * @brief  Configures SysTick to generate an interrupt each 250ms.
  * @param  None
  * @retval : None
  */
void SysTick_Configuration(void)
{
  /* Select HCLK/8 as SysTick clock source */
  SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);

  /* SysTick interrupt each 250ms with counter clock equal to 1MHz */
  if (SysTick_Config(250000))
  { 
    /* Capture error */ 
    while (1);
  }
  /* Set SysTick interrupt vector Preemption Priority to 1 */
  NVIC_SetPriority(SysTick_IRQn, 0x08);
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param file: pointer to the source file name
  * @param line: assert_param error line source number
  * @retval : None
  */
void assert_failed(uint8_t* file, uint32_t 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 2009 STMicroelectronics *****END OF FILE****/