STM32定时器1触发中断+溢出中断

wfmjj

 
 
 
bsp.c主要是对板载外设进行初始化
/**
  ******************************************************************************
  * @file    bsp.c
  * @author  wangfei
  * @date    13-April-2012
  * @e-mail  wfmjj@hotmail.com
  * @brief   Initialize peripherals.
  *****************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx.h"
#include "bsp.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/**
  * @brief   This function handles NMI exception.
  * @param  None
  * @retval None
  */
void Bsp_Init(void)
{
 Bsp_GPIO_Config();
 Bsp_TIM1_Config();
 Bsp_TIM3_Config();
 Bsp_NVIC_Config();
 Bsp_USART3_Config();
}
/**
  * @brief   This function config GPIO.
  * @param  None
  * @retval None
  */
void Bsp_GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure; 
 
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE,ENABLE);   //打开外设GPIOE的时钟
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE);     //turn on gpioc clock
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);    //turn on GPIOA clock
 
  GPIO_InitStructure.GPIO_Pin=(GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3);  //led口配置
   GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
   GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
   GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_NOPULL;
   GPIO_Init(GPIOE, &GPIO_InitStructure);
 
  GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_USART3);  //Connect USART3 pins to AF7
   GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_USART3);
 
  GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10 | GPIO_Pin_11;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
   GPIO_Init(GPIOC, &GPIO_InitStructure);
 
   //Connect TIM3 Pin to AF2
  GPIO_PinAFConfig(GPIOC,GPIO_PinSource6,GPIO_AF_TIM3);  //TIM3_Ch1
  GPIO_PinAFConfig(GPIOC,GPIO_PinSource7,GPIO_AF_TIM3);  //TIM3_Ch2
  GPIO_PinAFConfig(GPIOC,GPIO_PinSource8,GPIO_AF_TIM3);  //TIM3_Ch3
  GPIO_PinAFConfig(GPIOC,GPIO_PinSource9,GPIO_AF_TIM3);  //TIM3_Ch4
 // Config TIM3 Pin
 GPIO_InitStructure.GPIO_Pin=(GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9);
 GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
 GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
 GPIO_Init(GPIOC, &GPIO_InitStructure);
 
 GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_TIM1); //PA9--TIM1_CH2
 
 GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
 GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/**
  * @brief   This function config timer1.
  * @param  None
  * @retval None
  */
void Bsp_TIM1_Config(void)
{
 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);             //turn on timer1 clock
 
 TIM_DeInit(TIM1);
  TIM_TimeBaseStructure.TIM_Prescaler=0;                      
  TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;      //定时器1向上计数
  TIM_TimeBaseStructure.TIM_Period=0xffff;                        
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
 
 TIM1->CCMR1|=0X0100;  //配置定时器1为外部时钟模式1
 TIM1->CCER&=0XFF5F;
 TIM1->SMCR|=0X0067;
 
 TIM_ClearFlag(TIM1,(TIM_FLAG_Update|TIM_FLAG_Trigger));
}
/**
  * @brief   This function config timer3.
  * @param  None
  * @retval None
  */
void Bsp_TIM3_Config(void)
{
 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
 TIM_OCInitTypeDef TIM_OCInitStructure;
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);   //Open TIM3  Clock
 
 TIM_TimeBaseStructure.TIM_Prescaler=3;          //clk_cnt prescale
 TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;   //TIM3 Count mode
 TIM_TimeBaseStructure.TIM_Period=699;         //Fout_clk=Fclk_cnt/(ARR+1)=21000000/700=30KHZ
 TIM_TimeBaseStructure.TIM_ClockDivision=0;  
 
 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
 
 /* PWM1 Mode configuration: TIM3_Ch1 */
 TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;               //select PWM1 mode
 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //config oc1 as output
 TIM_OCInitStructure.TIM_Pulse=350;                            //config TIM3_CCR1 vaule
 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    //config oc1 high level avaliable
 TIM_OC1Init(TIM3, &TIM_OCInitStructure);
 
 TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);         // turn on oc1 preload
 
 /* PWM1 Mode configuration: TIM3_Ch2 */
 TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;               //select PWM1 mode
 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //config oc2 as output
 TIM_OCInitStructure.TIM_Pulse=200;                            //config TIM3_CCR2 vaule
 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    //config oc2 high level avaliable
 TIM_OC2Init(TIM3, &TIM_OCInitStructure);
 
 TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);         // turn on oc2 preload
 
 /* PWM1 Mode configuration: TIM3_CH3 */
 TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;               //select PWM1 mode
 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //config oc3 as output
 TIM_OCInitStructure.TIM_Pulse=100;                            //config TIM3_CCR1 vaule
 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    //config oc3 high level avaliable
 TIM_OC3Init(TIM3, &TIM_OCInitStructure);
 
 TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);         // turn on oc3 preload
 
 /* PWM1 Mode configuration: TIM3_CH4 */
 TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;               //select PWM1 mode
 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //config oc4 as output
 TIM_OCInitStructure.TIM_Pulse=500;                            //config TIM3_CCR1 vaule
 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    //config oc4 high level avaliable
 TIM_OC4Init(TIM3, &TIM_OCInitStructure);
 
 TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);         // turn on oc4 preload
 
 TIM_ARRPreloadConfig(TIM3, ENABLE);
  /* TIM3 enable counter */
  TIM_Cmd(TIM3, ENABLE);
}
/**
  * @brief   This function config usart3.
  * @param  None
  * @retval None
  */
void Bsp_USART3_Config(void)
{
 USART_InitTypeDef USART_InitStructure;
 
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //turn on usart3 clock
 
  USART_InitStructure.USART_BaudRate =115200 ;         //波特率设置
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USART3, &USART_InitStructure);
 
  //USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);
  USART_Cmd(USART3,ENABLE);
  USART_ClearFlag(USART3, USART_FLAG_TC);   //清除发送完成标志位
}
/**
  * @brief   This function config nvic.
  * @param  None
  * @retval None
  */
void Bsp_NVIC_Config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
 
  NVIC_InitStructure.NVIC_IRQChannel=TIM1_TRG_COM_TIM11_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
 
  NVIC_InitStructure.NVIC_IRQChannel=TIM1_UP_TIM10_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
}
 
app.c为函数
 
/**
  ******************************************************************************
  * @file    app.c
  * @author  wangfei
  * @date    13-April-2012
  * @e-mail  wfmjj@hotmail.com
  * @brief   Initialize peripherals.
  *****************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx.h"
#include "app.h"
#include "bsp.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
extern uint8_t TimeFlag;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/**
  * @brief   This function handles NMI exception.
  * @param  None
  * @retval None
  */
int main(void)
{
 GPIO_ResetBits(GPIOE,(GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3));  //可以通过观察LED口高电平时间
 Bsp_Init();
 while(1)
 {
   TIM_ITConfig(TIM1,TIM_IT_Trigger,ENABLE);  //允许定时器1的触发中断
   GPIO_SetBits(GPIOE,(GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3));
     TIM_Cmd(TIM1,ENABLE);                 //打开定时器1,当检测到TIM1_CH1通道的上升沿后立即触发中断
    while(TimeFlag==0);     //等待定时器1溢出中断
   TIM1->DIER&=0X0000;     //失能定时器1的所有中断
   GPIO_ResetBits(GPIOE,(GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3));  //可以通过观察LED口高电平时间
   TimeFlag=0;    //定时器1溢出标志置0
   Delay(100000000);
  }
}
/**
  * @brief  Delay Function.
  * @param  nCount:specifies the Delay time length.
  * @retval None
  */
void Delay(__IO uint32_t nCount)
{
  while(nCount--)
  {
  }
}
 
定时器1的触发中断和溢出中断函数
/**
  * @brief  This function handles TIM1 Update and TIM10.
  * @param  None
  * @retval None
  */
void TIM1_UP_TIM10_IRQHandler(void)
{
 if(TIM_GetITStatus(TIM1,TIM_IT_Update)==SET)  //检查定时器1溢出标志位是否置1
 {
  TIM1->CR1&=0XFFFE;    //关闭定时器1
  TIM1->CNT&=0X0000;    //清除计数器2计数寄存器的值
  TimeFlag=1;          //1s标志位置1
  TIM1->SR&=0XFFFE;    //退出定时器1溢出中断之前,必须清除定时器1的溢出标志位
 }
}
/**
  * @brief  This function handles TIM1 Trigger and Commutation and TIM11.
  * @param  None
  * @retval None
  * @note  定时器1打开后,当检测到TIM1_CH1通道出现上升沿时立即进入此中断。
  */
void TIM1_TRG_COM_TIM11_IRQHandler(void)
{
 if(TIM_GetITStatus(TIM1,TIM_IT_Trigger)==SET)  //检查是否为触发中断
 {
  TIM1->DIER&=0XFFBF;    //清除定时器1的触发中断
  TIM1->DIER|=0X0001;    //使能定时器1的溢出中断
  TIM1->SR&=0XFFBF;     //在退出中断之前必须清除其中断标志位
 }
}