一个定时器的中断里改变另一个定时器的定时时间 为什么没作用？

tanwenhe

/**
  ******************************************************************************
  * @file TIM/6Steps/main.c
  * @author  MCD Application Team
  * @version  V3.0.0
  * @date  04/06/2009
  * @brief  Main program body
  ******************************************************************************
  * @copy
  *
  * THE PRESENT FIRMWARE 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 FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"

/** @addtogroup StdPeriph_Examples
  * @{
  */

/** @addtogroup TIM_6Steps
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

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

void NVIC_Configuration(void);
 
void TIM2_Configuration(void);
   int A=500;
 
  int B=5000;
 
 
 
 
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval : None
  */
int main(void)
{   
  /* System Clocks Configuration */
  RCC_Configuration();

  /* NVIC Configuration */
  NVIC_Configuration();

  /* GPIO Configuration */
  GPIO_Configuration();

  /* SysTick Configuration */
 
     TIM2_Configuration();
 
 

 

 

  while (1)
   
     { }
 
 
}

 

 

 

void TIM2_Configuration(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

  /* TIM2 configuration */
 
  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = A;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
 
 
 
  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = B;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
 
 
 
  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period =5000;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
 
 
 

 

  /* Clear TIM2 update pending flag */
  TIM_ClearFlag(TIM2, TIM_FLAG_Update);
  /* Clear TIM3 update pending flag */
  TIM_ClearFlag(TIM3, TIM_FLAG_Update);
  /* Clear TIM4 update pending flag */
  TIM_ClearFlag(TIM4, TIM_FLAG_Update);

  /* Enable TIM2 Update interrupt */
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
  /* Enable TIM3 Update interrupt */
  TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
  /* Enable TIM4 Update interrupt */
  TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
 
 
 
  /* TIM2 enable counter */
  TIM_Cmd(TIM2, ENABLE);
  /* TIM3 enable counter */
  TIM_Cmd(TIM3, ENABLE);
  /* TIM4 enable counter */
  TIM_Cmd(TIM4, ENABLE);

 
 
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval : None
  */
void RCC_Configuration(void)
{
  /* Setup the microcontroller system. Initialize the Embedded Flash Interface, 
     initialize the PLL and update the SystemFrequency variable. */
  SystemInit();
 
  /* TIM1, GPIOA and GPIOB clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC|
                         RCC_APB2Periph_GPIOB, ENABLE);
 
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
 

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
 
 
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
 
}

/**
  * @brief  Configure the TIM1 Pins.
  * @param  None
  * @retval : None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* GPIOA Configuration: Channel 1, 2 and 3 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* GPIOB Configuration: Channel 1N, 2N and 3N as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

 
  /* GPIOA Configuration: Channel 1, 2 and 3 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
 

}

 

void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
 
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

 
  /* Enable the TIM2 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
 
  /* Enable the TIM3 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_Init(&NVIC_InitStructure);
 
  /* Enable the TIM4 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_Init(&NVIC_InitStructure);
 
 

}

 

 

void TIM2_IRQHandler(void)
{
  /* Clear TIM2 update interrupt */
  TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
 
 
 GPIO_WriteBit(GPIOC, GPIO_Pin_1, Bit_RESET);   
 
}

/**
  * @brief  This function handles TIM3 global interrupt request.
  * @param  None
  * @retval : None
  */
void TIM3_IRQHandler(void)
{
  /* Clear TIM3 update interrupt */
  TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
 
 GPIO_WriteBit(GPIOC, GPIO_Pin_1, Bit_SET);
 

}

/**
  * @brief  This function handles TIM4 global interrupt request.
  * @param  None
  * @retval : None
  */
void TIM4_IRQHandler(void)
{
  /* Clear TIM4 update interrupt */
  TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
 
 
 A=A+10;
 
 
 
 if(A>5000)
  
 {
   A=100;
 }
 
 
}

 

 

 

 

 

正点原子

大哥,你的C语言基础有点差哦.

u8 A=10;
u8 B=A;
while(1)
{
     A+=1;
     if(A>200)A=1;
}

你说上面这段代码,B会跟着A的变化而变化么?