基于STR912的看门狗程序

void GPIO_DeInit(GPIO_TypeDef* GPIOx)
{

  /* Reset the GPIO registers values */
  if(GPIOx == GPIO0)
  {
    SCU_APBPeriphReset(__GPIO0,ENABLE);
    SCU_APBPeriphReset(__GPIO0,DISABLE);
    SCU->GPIOTYPE[0x00] = 0x0000 ;
    SCU->GPIOOUT[0x00]  = 0x0000;
    SCU->GPIOIN[0x00]   = 0x0000;
  }

   if(GPIOx == GPIO1)
  {
    SCU_APBPeriphReset(__GPIO1,ENABLE);
    SCU_APBPeriphReset(__GPIO1,DISABLE);
    SCU->GPIOTYPE[0x01] = 0x0000 ;
    SCU->GPIOOUT[0x01]  = 0x0000;
    SCU->GPIOIN[0x01]   = 0x0000;
  }

   if(GPIOx == GPIO2)
  {
    SCU_APBPeriphReset(__GPIO2,ENABLE);
    SCU_APBPeriphReset(__GPIO2,DISABLE);
    SCU->GPIOTYPE[0x02] = 0x0000 ;
    SCU->GPIOOUT[0x02]  = 0x0000;
    SCU->GPIOIN[0x02]   = 0x0000;
  }

   if(GPIOx == GPIO3)
  {
    SCU_APBPeriphReset(__GPIO3,ENABLE);
    SCU_APBPeriphReset(__GPIO3,DISABLE);
    SCU->GPIOTYPE[0x03] = 0x0000 ;
    SCU->GPIOOUT[0x03]  = 0x0000;
    SCU->GPIOIN[0x03]   = 0x0000;
  }

   if(GPIOx == GPIO4)
  {
    SCU_APBPeriphReset(__GPIO4,ENABLE);
    SCU_APBPeriphReset(__GPIO4,DISABLE);
    SCU->GPIOTYPE[0x04] = 0x0000 ;
    SCU->GPIOOUT[0x04]  = 0x0000;
    SCU->GPIOIN[0x04]   = 0x0000;
    SCU->GPIOANA = 0x00;
  }

   if(GPIOx == GPIO5)
  {
    SCU_APBPeriphReset(__GPIO5,ENABLE);
    SCU_APBPeriphReset(__GPIO5,DISABLE);
    SCU->GPIOTYPE[0x05] = 0x0000 ;
    SCU->GPIOOUT[0x05]  = 0x0000;
    SCU->GPIOIN[0x05]   = 0x0000;
  }

   if(GPIOx == GPIO6)
  {
    SCU_APBPeriphReset(__GPIO6,ENABLE);
    SCU_APBPeriphReset(__GPIO6,DISABLE);
    SCU->GPIOTYPE[0x06] = 0x0000 ;
    SCU->GPIOOUT[0x06]  = 0x0000;
    SCU->GPIOIN[0x06]   = 0x0000;
  }

   if(GPIOx == GPIO7)
  {
    SCU_APBPeriphReset(__GPIO7,ENABLE);
    SCU_APBPeriphReset(__GPIO7,DISABLE);
    SCU->GPIOOUT[0x07]  = 0xAAAA;
    SCU->GPIOOUT[0x07]  = 0x0000;
    SCU->GPIOIN[0x07]   = 0x0000;
  }

   if(GPIOx == GPIO8)
  {
    SCU_APBPeriphReset(__GPIO8,ENABLE);
    SCU_APBPeriphReset(__GPIO8,DISABLE);
    SCU->GPIOEMI = 0x00;
  }

   if(GPIOx == GPIO9)
  {
    SCU_APBPeriphReset(__GPIO9,ENABLE);
    SCU_APBPeriphReset(__GPIO9,DISABLE);
    SCU->GPIOEMI = 0x00;
  }
}
/*******************************************************************************
* Function Name  : GPIO_Init
* Description    : Initializes the GPIOx peripheral according to the specified
*                  parameters in the GPIO_InitStruct .
* Input          :- GPIOx: where x can be (0..9) to select the GPIO peripheral.
*                 - GPIO_InitStruct: pointer to a GPIO_InitTypeDef structure that
*                   contains the configuration information for the specified GPIO
*                   peripheral.
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)
{
  /* Select pin direction */
  u8 PinNumber = 0;
  u8 Counter = 0;
  u8 GPIO_Number = 0;

  GPIO_Number = GPIO_GetGPIONumber(GPIOx);

  if(GPIO_InitStruct->GPIO_Direction == GPIO_PinOutput)
  {
  GPIOx->DDR |= GPIO_InitStruct->GPIO_Pin;
  }
  else
  {
   GPIOx->DDR &= ~GPIO_InitStruct->GPIO_Pin;
  }

   for (Counter = 0; Counter < 8;Counter++)
    {
     /*Search pin number*/
     PinNumber = (GPIO_InitStruct->GPIO_Pin & (1 <      if((PinNumber >> Counter) == 1)
     {
        /*Output ALternate 0*/
        SCU->GPIOOUT[GPIO_Number] &= ~(0x3 <<(Counter *2));
        if(GPIO_InitStruct->GPIO_Alternate == GPIO_OutputAlt1)
        {
          /*Output ALternate 1*/
          SCU->GPIOOUT[GPIO_Number] |= 1 << (Counter *2);
        }
        if(GPIO_InitStruct->GPIO_Alternate == GPIO_OutputAlt2)
        {
          /*Output ALternate 2*/
          SCU->GPIOOUT[GPIO_Number] |= 0x2 << (Counter *2);
        }
        if(GPIO_InitStruct->GPIO_Alternate == GPIO_OutputAlt3)
        {
          /*Output ALternate 3*/
          SCU->GPIOOUT[GPIO_Number] |= 0x3 << (Counter *2);
        }

       /*Type configuration: PushPull or Open Collector*/
        SCU->GPIOTYPE[GPIO_Number] &= ~(0x1 << Counter) ;
       if(GPIO_InitStruct->GPIO_Type == GPIO_Type_OpenCollector)
       {
         /*Open Drain configuration*/
        SCU->GPIOTYPE[GPIO_Number] |= 0x1 << Counter;
       }

       /*IP Connected disable*/
       SCU->GPIOIN[GPIO_Number] &= ~(0x1 << Counter) ;
       if(GPIO_InitStruct->GPIO_IPConnected == GPIO_IPConnected_Enable)
       {
         /*IP Connected enable*/
         SCU->GPIOIN[GPIO_Number] |= 0x1 << Counter;
       }
    }
 }
}