/FWLib/examples/IWDG/main.c

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************

* File Name          : main.c

* Author             : MCD Application Team

* Version            : V2.0.3

* Date               : 09/22/2008

* Description        : Main program body.

********************************************************************************

* 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.

*******************************************************************************/



/* Includes ------------------------------------------------------------------*/

#include "stm32f10x_lib.h"

#include "platform_config.h"



/* 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);

void Delay(vu32 nCount);



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

/*******************************************************************************

* Function Name  : main

* Description    : Main program.

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

int main(void)

{

#ifdef DEBUG

  debug();

#endif



  /* 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)

  {}

}



/*******************************************************************************

* Function Name  : RCC_Configuration

* Description    : Configures the different system clocks.

* Input          : None

* Output         : None

* Return         : 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);

}



/*******************************************************************************

* Function Name  : GPIO_Configuration

* Description    : Configures the different GPIO ports.

* Input          : None

* Output         : None

* Return         : 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);

}



/*******************************************************************************

* Function Name  : EXTI_Configuration

* Description    : Configures EXTI Line9.

* Input          : None

* Output         : None

* Return         : 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);

}



/*******************************************************************************

* Function Name  : NVIC_Configuration

* Description    : Configure the nested vectored interrupt controller.

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void NVIC_Configuration(void)

{

  NVIC_InitTypeDef NVIC_InitStructure;



#ifdef  VECT_TAB_RAM

  /* Set the Vector Table base location at 0x20000000 */

  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);

#else  /* VECT_TAB_FLASH  */

  /* Set the Vector Table base location at 0x08000000 */

  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);

#endif



  /* Configure one bit for preemption priority */

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);



  /* Enable the EXTI9_5 Interrupt */

  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);



  /* Set SysTick interrupt vector Preemption Priority to 1 */

  NVIC_SystemHandlerPriorityConfig(SystemHandler_SysTick, 1, 0);

}



/*******************************************************************************

* Function Name  : Delay

* Description    : Inserts a delay time.

* Input          : nCount: specifies the delay time length.

* Output         : None

* Return         : None

*******************************************************************************/

void Delay(vu32 nCount)

{

  for (; nCount != 0; nCount--);

}



#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



/*******************************************************************************

* Function Name  : SysTick_Configuration

* Description    : Configures SysTick to generate an interrupt each 250ms.

* Input          : None

* Output         : None

* Return         : 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 */

  SysTick_SetReload(250000);



  /* Enable the SysTick Counter */

  SysTick_CounterCmd(SysTick_Counter_Enable);



  /* Enable the SysTick Interrupt */

  SysTick_ITConfig(ENABLE);

}



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