main.c

STR7系列32位ARM控制器的固件库

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Version            : V4.0
* Date               : 10/09/2007
* Description        : Main program body
********************************************************************************
 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 "71x_lib.h"

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

#define T3_OCMP_A            0x04
#define T3_ICAP_A            0x02

/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name      : main
* Description        : main routine
* Input              : None.
* Return             : None.
*******************************************************************************/
int main(void)
{
  #ifdef DEBUG
  debug ();
  #endif

  /* System clocks configuration ---------------------------------------------*/
  /* MCLK = PCLK1 = PCLK2 = 8MHz*/ 
  
  /* Enable TIM3 and GPIO1 clocks on APB2 */
  APB_ClockConfig (APB2, ENABLE, TIM3_Periph | GPIO1_Periph);
  
  /* GPIO1 configuration -----------------------------------------------------*/

  /* Timer 3 Output Compare function pin (P1.2) configured as Alternate
   function pushpull. */
  GPIO_Config (GPIO1, T3_OCMP_A, GPIO_AF_PP);

  /*  Timer 3 Input Capture A (P1.1) configured as input TTL state */
  GPIO_Config (GPIO1, T3_ICAP_A, GPIO_IN_TRI_TTL);

  /* TIM3 configuration ------------------------------------------------------*/

  /*  Initialize the Timer 3 registers to reset values */
  TIM_Init (TIM3);

  /*  Configure the TIM Prescaler */
  TIM_PrescalerConfig (TIM3, 0x7F);

  /*  Configure the TIM3 Output Compare Function : */
  /*    The OCMPA pin is configured to toggle from Low level to High level after
     0x3000 timer ticks. */
  TIM_OPModeConfig (TIM3, 0xF, TIM_HIGH, TIM_LOW, TIM_RISING);
  /*                   |      |      |         |        |
              TIM 3 <--+      |      |         |        +--> Activation edge on ICAP_A
                              |      |         |
             Pulse Length  <--+      |         +--> Level After The pulse
                                     |
       Level During the Pulse    <---+                                       */


  /*  Start the Counter */
  TIM_CounterConfig (TIM3, TIM_START);

  /*  Infinite loop */
  while (1)
  {
  /*  Infinite loop */
  }
}

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/