stm32之定时器彻底研究

相比较而言，直接操作定时器比较简洁，对着寄存器看十分明了。而使用库文件有一点晕头转向。

（个人观点）

程序如下：（以下程序在DX32的例程修改而来，使用的是比较古老的3.0固件库）

1、timer.c文件

#include "STM32Lib\stm32f10x.h"
void TIM2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
u16 CCR1_Val = 4000;
u16 CCR2_Val = 2000;
u16 CCR3_Val = 1000;
u16 CCR4_Val = 500;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

TIM_TimeBaseStructure.TIM_Period = 10000; //计满值
TIM_TimeBaseStructure.TIM_Prescaler = 7200-1; //预分频,此值+1为分频的除数
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Inactive; //输出比较非主动模式
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //极性为正

TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable); //禁止OC1重装载,其实可以省掉这句,因为默认是4路都不重装的.

TIM_OCInitStructure.TIM_Pulse = CCR2_Val;

TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);

TIM_OCInitStructure.TIM_Pulse = CCR3_Val;

TIM_OC3Init(TIM2, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);

TIM_OCInitStructure.TIM_Pulse = CCR4_Val;

TIM_OC4Init(TIM2, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Disable);

TIM_ARRPreloadConfig(TIM2, ENABLE);

TIM_ClearITPendingBit(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4|TIM_IT_Update);

TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4|TIM_IT_Update, ENABLE);

TIM_Cmd(TIM2, ENABLE);
}
void TIM3_Configuration(u16 p,u16 psc)
{
RCC->APB1ENR|=1<1;//TIM3时钟使能
//自动装载寄存器
TIM3->ARR=p; //设定定时器自动重装值
//PSC预分频寄存器
TIM3->PSC=psc; //设定定时器的分频系数

TIM3->DIER|=1<0; //允许更新中断
TIM3->DIER|=1<6; //允许触发中断
TIM3->CR1|=0X01; //使能定时器3（这里面包括计数方向为向上计数）
}
#if 0
void TIM4_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

TIM_TimeBaseStructure.TIM_Period = 10000; //计满值
TIM_TimeBaseStructure.TIM_Prescaler = 7200-1; //预分频,此值+1为分频的除数
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

TIM_ARRPreloadConfig(TIM4, ENABLE);

TIM_ClearITPendingBit(TIM4, TIM_IT_Update);

TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);

TIM_Cmd(TIM4, ENABLE);
}
#else
void TIM_Configuration(u16 p,u16 psc)
{
RCC->APB1ENR|=1<2;//TIM4时钟使能
//自动装载寄存器
TIM4->ARR=p; //设定定时器自动重装值
//PSC预分频寄存器
TIM4->PSC=psc; //设定定时器的分频系数

TIM4->DIER|=1<0; //允许更新中断
TIM4->DIER|=1<6; //允许触发中断
TIM4->CR1|=0X01; //使能定时器3（这里面包括计数方向为向上计数）
}
#endif

上程序中，定时器2被配置成多路捕获模式，定时器3是直接操作寄存器进行配置的。

定时器4用了两种配置方式，使用固件库和直接操作寄存器。可以切换。效果一样。

需要注意的是，stm32103RBT6的通用定时器只有2、3、4.(没有5)

2、stm32f10x_it.c文件

unsigned int cnt=0;
unsigned int flag=0;
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
{

TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);

//可添加功能块......

}
else if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);

//可添加功能块......
}
else if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);

//可添加功能块......
}
else if (TIM_GetITStatus(TIM2, TIM_IT_CC4) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC4);

//可添加功能块......
}
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
//flag=1;//计时满标志位置位
//cnt++;//每TIM_Period计时满变量加一
}
}