关于STM32定时器的问题，求解答求解答~~~·

只看该作者 · 2011-3-29 21:46

我原来在学习51单片机的时候知道51的定时器可以当一个“闹钟”用，就是打开它，然后让它一直计数，加到预先设定的值后进入中断。我刚开始接触STM32，也想这么试一下，所以没使用TIM的任何通道，就是设置了时间基，然后打开定时器，但是计数器加到预装载值后，为什么进不去中断呢？？？？求哪位专家帮忙解答下，小弟先行谢过了。
这是我写的程序，
主程序：int main(void)
{
// u32 cnt = 0x000fffff;
  /* System Clocks Configuration */
  RCC_Configuration();
  NVIC_Configuration();
  /* Configure the GPIO ports */
  GPIO_Configuration();
  timer_configuration();
}
设置定时器：void timer_configuration(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_DeInit(TIM3);       /* deinitiate */
  TIM_TimeBaseStructure.TIM_Period =800;
  TIM_TimeBaseStructure.TIM_Prescaler=0x5;
  TIM_TimeBaseStructure.TIM_ClockDivision=0x0;
  TIM_TimeBaseStructure.TIM_CounterMode =TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

  TIM_Cmd(TIM3, ENABLE);
  TIM_ITConfig(TIM3,TIM_IT_CC1,ENABLE);
  TIM_iTConfig(TIM3,ENABLE);
}

只看该作者 · 2011-3-29 21:52

这是中断嵌套部分的设置：
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
}

只看该作者 · 2011-3-30 08:15

求助啊~~

只看该作者 · 2011-3-30 08:33

确定定时器工作了么？
定时器的时钟源选择了么？

1万 · 2011-3-30 12:47

好象没有给 TIM3 打开时钟吧? 再看看
其实你这个功能用 Systick 更合适, 用 TIM3 有点浪费

只看该作者 · 2011-3-30 16:39

#include"stm32f10x_lib.h"

void RCC_Configuration(void);
void NVIC_Configuration(void);
void Timer_Configuration(void);
void GPIO_Configuration(void);

int main(void)
{
#ifdef debug
  debug();
#endif
  RCC_Configuration();
  NVIC_Configuration();
  Timer_Configuration();
  GPIO_Configuration();
  while(1)
  {

  }
}

void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);  //设置外部高速晶振（HSE）    HSE晶振ON
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();  //等待HSE起振
if(HSEStartUpStatus == SUCCESS)//    该函数将等待直到HSE就绪，或者在超时的情况下退出
{    //SUCCESS：HSE晶振稳定且就绪  ERROR：HSE晶振未就绪
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);  //设置AHB时钟（HCLK）    系统时钟=AHB时钟
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1); //设置高速AHB时钟（PCLK2） APB1时钟 = HCLK
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2); //设置低速AHB时钟（PCLK1） APB1时钟 = HCLK / 2
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2); //设置代码延时值    2延时周期
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);  //使能或者失能预取指缓存    预取指缓存使能 ?
/* PLLCLK = 8MHz * 9 = 56 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);  //设置PLL时钟源及倍频系数
/* Enable PLL */    //PLL的输入时钟 = HSE时钟频率 PLL输入时钟 x 9
RCC_PLLCmd(ENABLE);    //使能或者失能PLL
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) //检查指定的RCC标志位设置与否  PLL就绪
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); //设置系统时钟（SYSCLK）    RCC_SYSCLKSource: 用作系统时钟的时钟源
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08) //返回用作系统时钟的时钟源    PLL作为系统时钟
{
}
}
/* Enable peripheral clocks --------------------------------------------------*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE); //使能GPIOD TIM2
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
}

void NVIC_Configuration(void)
{
NVIC_InitTypeDef  NVIC_InitStructure;
#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
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;  //TIM2全局中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

void Timer_Configuration(void)
{
TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;

TIM_TimeBaseStructure.TIM_Period=2000; //自动重装载寄存器的值       1s
TIM_TimeBaseStructure.TIM_Prescaler= (36000 - 1); //时钟预分频数
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; //时钟分割0x00
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ClearFlag(TIM2, TIM_FLAG_Update); //清除溢出中断标志
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);//标志位当TIM_IT_Update,ENABLE 定时时间到
TIM_Cmd(TIM2, ENABLE);
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11; //推挽输出
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
}

void TIM2_IRQHandler(void)
{
  if(TIM_GetITStatus(TIM2,TIM_IT_Update)!=RESET)
   {
   TIM_ClearITPendingBit(TIM2 , TIM_FLAG_Update);
   if(ten==0x11)
   {
      GPIO_Write(GPIOD,0x0f00);
ten=0x22;
   }
   else if(ten==0x22)
   {
   GPIO_Write(GPIOD,0x0000);
ten=0x33;
   }
   else if(ten==0x33)
   {
GPIO_SetBits(GPIOD,GPIO_Pin_8|GPIO_Pin_10);
ten=0x44;
   }
   else if(ten==0x44)
   {
GPIO_ResetBits(GPIOD,GPIO_Pin_8|GPIO_Pin_10);
ten=0x55;
   }
   else if(ten==0x55)
   {
GPIO_SetBits(GPIOD,GPIO_Pin_9|GPIO_Pin_11);
ten=0x66;
   }
   else
   {
   GPIO_ResetBits(GPIOD,GPIO_Pin_9|GPIO_Pin_11);
   ten=0x11;
   }
}
}

只看该作者 · 2011-3-30 16:40

这是我当时的TIM学习程序希望能对你有用

只看该作者 · 2011-4-5 12:31

7# lu150

LZ开错中断了，应该像你给的里程这样开溢出更新的中断。谢了~

只看该作者 · 2011-4-6 10:43

给你一个我的
void TIM2_int(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;

  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 18000;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned3;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  TIM_ARRPreloadConfig(TIM2,DISABLE);
  /* only counter overflow/underflow generate U interrupt */
  TIM_UpdateRequestConfig(TIM2,TIM_UpdateSource_Global);

  /* Output Compare Timing Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1 ;
  TIM_OCInitStructure.TIM_Pulse = 5455;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC3Init(TIM2, &TIM_OCInitStructure);

  TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);


  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
  TIM_OCInitStructure.TIM_Pulse = 9000;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC2Init(TIM2, &TIM_OCInitStructure);

  TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);


  /* TIM IT enable */
  TIM_ITConfig(TIM2, TIM_IT_CC3 | TIM_IT_CC2 , ENABLE);

  /* TIM2 enable counter */
  //TIM_Cmd(TIM2, ENABLE);
}
用时TIM_Cmd(TIM2, ENABLE);
就可以了

关于STM32定时器的问题，求解答求解答~~~·

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