main.c

str75x的软件库源代码

/******************** (C) COPYRIGHT 2006 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Date First Issued  : 03/10/2006
* Description        : Main program body
********************************************************************************
* History:
* 07/17/2006 : V1.0
* 03/10/2006 : V0.1
********************************************************************************
* THE PRESENT SOFTWARE 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 SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "75x_lib.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
WDG_InitTypeDef WDG_InitStructure;
ErrorStatus OSC4MStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void MRCC_Configuration(void);
void GPIO_Configuration(void);
static void Delay(u32 nCount);

/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name  : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main()
{
  #ifdef DEBUG
    debug();
  #endif
  
  /* Configure the system clocks */
  MRCC_Configuration();
  
  /* Configure the GPIO ports */
  GPIO_Configuration(); 
     
  /* Turn off led connected to P2.18 pin */
  GPIO_WriteBit(GPIO2, GPIO_Pin_18, Bit_SET);

  /* Inserts a delay */ 
  Delay(0xFFFFF);
  
  /* Turn on led connected to P2.18 pin */
  GPIO_WriteBit(GPIO2, GPIO_Pin_18, Bit_RESET);

  /* Configure the WDG to generate a system reset each 4.2s */
  WDG_InitStructure.WDG_Mode = WDG_Mode_WDG;
  WDG_InitStructure.WDG_Preload = 0xFFFF;
  WDG_InitStructure.WDG_Prescaler = 0xFF;
  WDG_Init(&WDG_InitStructure);
     
  /* Enable the WDG */
  WDG_Cmd(ENABLE);

  while (1);
}

/*******************************************************************************
* Function Name  : MRCC_Configuration
* Description    : Configures the different system clocks
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void MRCC_Configuration(void)
{
  /* MRCC system reset(for debug purpose) */
  MRCC_DeInit();

  /* Wait for OSC4M start-up */
  OSC4MStartUpStatus = MRCC_WaitForOSC4MStartUp();

  if(OSC4MStartUpStatus == SUCCESS)
  {
    /* Set HCLK to  4MHz */
    MRCC_HCLKConfig(MRCC_CKSYS_Div1);

    /* Set CKTIM to 4 MHz */
    MRCC_CKTIMConfig(MRCC_HCLK_Div1);

    /* Set PCLK to 4 MHz */
    MRCC_PCLKConfig(MRCC_CKTIM_Div1);

    /* Set CKSYS to 4 MHz */
    MRCC_CKSYSConfig(MRCC_CKSYS_OSC4M, MRCC_PLL_Disabled);
  }

  /* GPIO pins optimized for 3V3 operation */
  MRCC_IOVoltageRangeConfig(MRCC_IOVoltageRange_3V3);  
  
  /* Enable GPIO Clock */
  MRCC_PeripheralClockConfig(MRCC_Peripheral_GPIO, 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 P2.18 as Output Push-Pull */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_18;
  GPIO_Init(GPIO2, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name  : Delay
* Description    : Inserts a delay time.
* Input          : nCount: specifies the delay time length.
* Output         : None
* Return         : None
*******************************************************************************/
static void Delay(u32 nCount)
{
  u32 j = 0;

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

/******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/