main.c

新型的M3核ARM开发例程

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Date First Issued  : 05/21/2007
* Description        : TIM Example 7 Main program body
********************************************************************************
* History:
* 05/21/2007: V0.3
********************************************************************************
* 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 "stm32f10x_lib.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/ 
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_ICInitTypeDef  TIM_ICInitStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
    
/* 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();
       
  /* NVIC configuration */
  NVIC_Configuration();

  /* Configure the GPIO ports */
  GPIO_Configuration();


  /* TIM2 configuration: One Pulse mode ------------------------
     The external signal is connected to TIM2 CH2 pin (PA.01), 
     The Rising edge is used as active edge,
     The One Pulse signal is outputted on TIM2 CH1 pin (PA.00)
     The TIM_Pulse defines the delay value 
     The (TIM_Period -  TIM_Pulse) defines the One Pulse value.
     The TIMxCLK is fixed to 72 MHz, the Prescaler is 0x1, so the 
     The TIMxCLK frequency is set to 72 MHz, the Prescaler is 0x1 
     so the TIM2 counter clock is 36 MHz. 
     The Autoreload value is 0xFFFF (TIM2->ARR), so the maximum 
     frequency value to trigger the TIM2 input is 500 Hz.
     The TIM_Pulse defines the delay value, the delay value is fixed 
     to 455.08 us:
     delay =  CCR1/TIM2 counter clock = 455.08 us. 
     The (TIM_Period - TIM_Pulse) defines the One Pulse value, 
     the pulse value is fixed to 1.365ms:
     One Pulse value = (TIM_Period - TIM_Pulse)/TIM2 counter clock = 1.365 ms.
  ------------------------------------------------------------ */
   
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 0xFFFF;          
  TIM_TimeBaseStructure.TIM_Prescaler = 0x01;       
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 
  
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
   
  /* TIM2 PWM2 Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;          
  TIM_OCInitStructure.TIM_Channel = TIM_Channel_1;          
  TIM_OCInitStructure.TIM_Pulse = 0x3FFF;  
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    
  TIM_OCInit(TIM2, &TIM_OCInitStructure); 
  
  /* TIM2 configuration in Input Capture Mode */ 

  TIM_ICStructInit(&TIM_ICInitStructure);

  TIM_ICInitStructure.TIM_ICMode = TIM_ICMode_ICAP;            
  TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;           
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;         
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;       
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;       
  TIM_ICInitStructure.TIM_ICFilter = 0x0;
  
  TIM_ICInit(TIM2, &TIM_ICInitStructure);

  /* One Pulse Mode selection */
  TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single);
 
  /* Input Trigger selection */
  TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);

  /* Slave Mode selection: Trigger Mode */
  TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Trigger);
 
  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)
  {
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* PLLCLK = 8MHz * 9 = 72 MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    /* Enable PLL */ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
  
  /* TIM2 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  /* GPIOA clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configure the GPIOD Pins.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* GPIOA Configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_Init(GPIOA, &GPIO_InitStructure); 
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#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
}

#ifdef  DEBUG
/*******************************************************************************
* Function Name  : assert_failed
* Description    : Reports the name of the source file and the source line number
*                  where the assert error has occurred.
* Input          : - file: pointer to the source file name
*                  - line: assert 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) */

  while(1)
  {
  }	
}
#endif

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