STM32F单纯的TIM2定时器溢出中断试验程序

[复制链接]

endlesswind 发布时间：2008-9-3 20:04

文章
文章封面:	-
文章简介:	-

STM32F定时器的功能非常丰富，像我这样单纯的TIM2定时器溢出中断人恐怕不多了，所以找例子资料也找不到费了九牛二虎之力终于杜撰出来了，发帖庆祝！我这里用了ST新版的STM32F FWLIB2.0库，用到的函数都添加了中文注释。

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"

ErrorStatus HSEStartUpStatus;

void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void TIM_Configuration(void);
void delay(void);

/*******************************************************************************
* Function Name  : main
* Description : Main program
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/
int main(void)
{

#ifdef DEBUG
  debug();/*[初始化外围设备指针]*/
#endif
  GPIO_Configuration();//初始化io口
  NVIC_Configuration();//初始化中断嵌套
  RCC_Configuration(); //初始化时钟与复位
  TIM_Configuration();//初始化定时器

  while(1)
  {

   delay();
  }
}

/*******************************************************************************
* 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)[复位RCC外围设备寄存器到默认复位值] */
  RCC_DeInit();

  /* Enable HSE [HSE振荡器开启]*/
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready [等待HSE启动]*/
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
/* Enable Prefetch Buffer [预取缓冲区允许]*/
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* Flash 2 wait state[代码2个延时周期] */
FLASH_SetLatency(FLASH_Latency_2);

/* HCLK = SYSCLK [AHB时钟等于SYSCLK]*/
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK [APB2时钟等于HCLK]*/
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 [低速APB1时钟等于HCLK/2]*/
RCC_PCLK1Config(RCC_HCLK_Div2);

/* PLLCLK = 8MHz * 9 = 72 MHz [配置PLL时钟源和乘法因子][PLL时钟输入等于HSE时钟][PLL乘法因子取值9]*/
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

/* Enable PLL [允许PLL]*/
RCC_PLLCmd(ENABLE);

/* Wait till PLL is ready [等待PLL时钟就绪]*/
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}

/* Select PLL as system clock source [选择PLL作为系统时钟]*/
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

/* Wait till PLL is used as system clock source[等待PLL被作为系统时钟] */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
  }
/* TIM2 clock enable [TIM2定时器允许]*/
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);


}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description : LED输出配置
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable GPIOC clock [使能GPIOC时钟]*/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

  /* Configure PC.04, PC.05, PC.06 and PC.07 as output push-pull[把PC4、PC5、PC6、PC7配置成输出模式] */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_4 | GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//GPIO最高速度50MHz
  GPIO_Init(GPIOC, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description : Configures the nested vectored interrupt controller.[配置中断向量表的起始位置]
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

#ifdef  VECT_TAB_RAM
  /* Set the Vector Table base location at 0x20000000 [设置中断向量表的起始位置0x20000000]*/
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000[设置中断向量表的起始位置0x0x08000000] */
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

  /* Configure the NVIC Preemption Priority Bits[配置优先级组] */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  /* Enable the TIM2 gloabal Interrupt [允许TIM2全局中断]*/
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

/*******************************************************************************
* Function Name  : TIM2_Configuration
* Description :
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/
void TIM_Configuration(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
//  TIM_OCInitTypeDef  TIM_OCInitStructure ;
  TIM_DeInit( TIM2);//复位TIM2定时器

  /* TIM2 configuration */
  TIM_TimeBaseStructure.TIM_Period = 0xffff; //最大计数值0xffff
  TIM_TimeBaseStructure.TIM_Prescaler = 0x36;//分频0x36
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; // 时钟分割
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //计数方向向上计数
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);


  /* Clear TIM2 update pending flag[清除TIM2溢出中断标志] */
  TIM_ClearFlag(TIM2, TIM_FLAG_Update);

  /* Enable TIM2 Update interrupt [TIM2溢出中断允许]*/
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

  /* TIM2 enable counter [允许tim2计数]*/
  TIM_Cmd(TIM2, ENABLE);
}

/*******************************************************************************
* Function Name  : delay
* Description : 延时
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/
void delay(void)
{
  u32 i,j;
  for (i=0; i