main.c

STM8示例程序

/**
  ******************************************************************************
  * @file IWDG_RearmReset\main.c
  * @brief This file contains the main function for IWDG Rearm Reset example.
  * @author STMicroelectronics - MCD Application Team
  * @version V1.0.1
  * @date 09/22/2008
  ******************************************************************************
  *
  * 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 2008 STMicroelectronics</center></h2>
  * @image html logo.bmp
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm8s_lib.h"


/**
  * @addtogroup IWDG_RearmReset
  * @{
  */

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Evalboard I/Os configuration */

#define LEDS_PORT (GPIOH)
#define LED1_PIN  (GPIO_PIN_3)
#define LED2_PIN  (GPIO_PIN_2)
#define LED3_PIN  (GPIO_PIN_1)
#define LED4_PIN  (GPIO_PIN_0)
#define BUTTON_PORT (GPIOC)
#define BUTTON_PIN  (GPIO_PIN_0)

#define Key_is_Pressed ((GPIO_ReadInputData(BUTTON_PORT) & BUTTON_PIN) == (u8)0x00)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
FunctionalState Refresh;
u16 TIME = 0xFFFF;

/* Private function prototypes -----------------------------------------------*/

void Delay (u16 nCount);
void GPIO_Configuration(void);
void IWDG_Configuration(void);
void Test_IWDGReset(void);


/**
  * @brief Example firmware main entry point.
  * @par Parameters:
  * None
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Library functions called:
  * - IWDG_ReloadCounter
  * - GPIO_WriteHigh
  * - GPIO_WriteLow 
  */
void main(void)
{

  /* Contains which LEDs to operate */
  u8 Leds;
    
  /* GPIO Configuration */
  GPIO_Configuration();

  /*Test if Reset occured*/
  Test_IWDGReset();

  /* IWDG Configuration */
  IWDG_Configuration();

 
  /* Choose Led 1 & 3 */
  Leds = (LED1_PIN|LED3_PIN);
	
	/* LEDs ON */
  GPIO_WriteHigh(LEDS_PORT, Leds);
	
	/* Enable IWDG Refresh */
  Refresh = ENABLE;
	
  while (1)
  {
		if (Key_is_Pressed)
		{
			/* ------ Button is pressed ------ */	  		
			/* Disable IWDG Refresh */
			Refresh = DISABLE;
		
			/* LEDs OFF */
			GPIO_WriteLow(LEDS_PORT, Leds);
	   
      /* Choose Leds 2 & 4 */
	    Leds = (LED2_PIN|LED4_PIN);
	   
			/* LEDs ON */
			GPIO_WriteHigh(LEDS_PORT, Leds);			
	  }

   	if (Refresh == ENABLE)
	  {
			/* Refresh IWDG */
			IWDG_ReloadCounter();
    }
  }
}

/* Private functions ---------------------------------------------------------*/
void Delay(u16 nCount) 
{
	u16 i=0;

  /* Decrement nCount value */
  for (i=0; i<nCount; i++)
	{  
		nop();
		nop();
	}
}

/**
  * @brief Configures the IWDG to generate a Reset if it is not refreched at the correct time. 
  * @par Parameters:
  * None
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Library functions called:
  * - IWDG_Enable
  * - IWDG_WriteAccessCmd
  * - IWDG_SetPrescaler
  * - IWDG_SetReload
  * - IWDG_ReloadCounter
  */
void IWDG_Configuration(void)
{
	/* Enable the IWDG*/
	IWDG_Enable();
  /* Enable the access to the IWDG registers*/
	IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
	/* Fixe IWDG Reset period */
  IWDG_SetPrescaler(IWDG_Prescaler_256);
	IWDG_SetReload(0xFF);
	/* Refresh IWDG */
  IWDG_ReloadCounter();
}

/**
  * @brief Configures the Leds and the Button IO .
  * @par Parameters:
  * None
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Library functions called:
  * - GPIO_Init
  */
void GPIO_Configuration(void) 
{
  
  /* Initialize I/Os in Output Mode */
  GPIO_Init(LEDS_PORT, (LED1_PIN | LED2_PIN | LED3_PIN | LED4_PIN), GPIO_MODE_OUT_PP_LOW_FAST);
	
	/* Initialize I/O in Input Mode with Interrupt */
  GPIO_Init(BUTTON_PORT, BUTTON_PIN, GPIO_MODE_IN_FL_NO_IT);

}

/**
  * @brief Tests if the Microcontroller has occured an IWDG Reset if Yes, Leds are Toggled n times.
  * @par Parameters:
  * None
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Library functions called:
  * - RST_GetFlagStatus
  * - RST_ClearFlag
  * - GPIO_WriteHigh
  * - GPIO_WriteLow 
  */
void Test_IWDGReset(void)
{
  FlagStatus IwdgFlag;
	u8 i=0;
	u8 n=2;
  u8 Leds = (LED2_PIN | LED4_PIN);
  
  /*Get IWDG Reset Status */ 
	IwdgFlag = RST_GetFlagStatus(RST_FLAG_IWDGF);

  
  /* Test if a IWDG Reset has occured */
	if (IwdgFlag)
  {
		for(i=0;i<n;i++)
		{
			/* ---------- An IWDG Reset has occured, Toggles LD1, LD2, LD3 and LD4 ------- */
			/* LEDs on */
			GPIO_WriteHigh(LEDS_PORT, Leds);
			/* delay */		
			Delay(TIME);
			Delay(TIME);
			/* LEDs off */
			GPIO_WriteLow(LEDS_PORT, Leds); 
			/* delay */		
			Delay(TIME);
			Delay(TIME);
		}
    /* Clear IWDGF Flag */
		RST_ClearFlag(RST_FLAG_IWDGF);
	}
}




/**
  * @brief Reports the name of the source file and the source line number where
  * the assert error has occurred.
  * 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)
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Called functions:
  * None
  */
#ifdef FULL_ASSERT
void assert_failed(u8 *file, u16 line)
#else
void assert_failed(void)
#endif
{
  /* Add your own code to manage an assert error */
  /* Infinite loop */
  while (1)
  {
  }
}

/**
  * @}
  */

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