STM32M103

只看该作者 · 2016-12-2 21:18

我32新手，定时器中断基本配置都配置过了，为什么没有进入中断啊。灯都没亮过.
void Tim3_Init(void)
{
TIM_TimeBaseInitTypeDef Tim_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelCmd =ENABLE;
NVIC_Init(&NVIC_InitStruct);

Tim_InitStruct.TIM_ClockDivision = 0;
Tim_InitStruct.TIM_CounterMode = TIM_CounterMode_Down; //想上计数
Tim_InitStruct.TIM_Prescaler = 7200-1;  //预分频
Tim_InitStruct.TIM_Period = 10000; //重装载寄存器的值
TIM_TimeBaseInit(TIM3,&Tim_InitStruct);

printf("Counter = %d  Prescaler = %d\n",TIM_GetCounter(TIM3),TIM_GetPrescaler(TIM3));

TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);  //设置定时器更新时间为中断源
TIM_Cmd(TIM3,ENABLE);
}

void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update))
{
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
LED1(1);  //点亮LED灯
DelayMs(1000);
LED1(0);  //熄灯
}
}

只看该作者 · 2016-12-2 21:22

TIM_CounterMode_Up

1万 · 2016-12-2 21:24

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "usart.h"
#include "timer.h"
//STM32开发板实验8
//定时器中断实验

int main(void)
{

delay_init();            //延时函数初始化
NVIC_Configuration();    //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
// uart_init(9600);    //串口初始化为9600
LED_Init();       //LED端口初始化
TIM3_Int_Init(4999,7199);//10Khz的计数频率，计数到5000为500ms
   while(1)
{
LED0=!LED0;
delay_ms(200);
}
}

重点分析： TIM3_Int_Init(4999,7199);//10Khz的计数频率，计数到5000为500ms

void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能

//定时器TIM3初始化
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断

//中断优先级NVIC设置
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //初始化NVIC寄存器

TIM_Cmd(TIM3, ENABLE);  //使能TIMx
}

//定时器3中断服务程序
void TIM3_IRQHandler(void) //TIM3中断
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  //检查TIM3更新中断发生与否
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //清除TIMx更新中断标志
LED1=!LED1;
}
}