STM32中的定時(shí)器有很多用法：

（一）系統(tǒng)時(shí)鐘(SysTick)

設(shè)置非常簡單，以下是產(chǎn)生1ms中斷的設(shè)置，和產(chǎn)生10ms延時(shí)的函數(shù)：

void RCC_Configuration(void)

{

RCC_ClocksTypeDef RCC_ClockFreq;

SystemInit();/源自system_stm32f10x.c文件,只需要調(diào)用此函數(shù),則可完成RCC的配置.

RCC_GetClocksFreq(RCC_ClockFreq);

/SYSTICK分頻--1ms的系統(tǒng)時(shí)鐘中斷

if (SysTick_Config(SystemFrequency / 1000))

{

while (1); / Capture error

}

}

void SysTick_Handler(void)/在中斷處理函數(shù)中的程序

{

while(tim)

{

tim--;

}

}

/調(diào)用程序:

Delay_Ms(10);

當(dāng)然，前提是要設(shè)置好，變量tim要設(shè)置成volatile類型的。

（二）第二種涉及到定時(shí)器計(jì)數(shù)時(shí)間（TIMx)

TIM_TimeBaseStructure.TIM_Prescaler = 2;/預(yù)分頻(時(shí)鐘分頻)72M/(2 1)=24M

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;/向上計(jì)數(shù)

TIM_TimeBaseStructure.TIM_Period = 65535; /裝載值18k/144=125hz

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;

TIM_TimeBaseInit(TIM3,TIM_TimeBaseStructure);

定時(shí)時(shí)間計(jì)算：

TIM_TimeBaseStructure.TIM_Prescaler = 2;

/分頻2 72M/(2 1)/2=24MHz

TIM_TimeBaseStructure.TIM_Period = 65535; /計(jì)數(shù)值65535

((1 TIM_Prescaler)/72M)*(1 TIM_Period )=((1 2)/72M)*(1 65535)=0.00273秒=366.2Hz*/

注意兩點(diǎn)（來自大蝦網(wǎng)，未經(jīng)檢驗(yàn)）

（1）TIMx(1-8），在庫設(shè)置默認(rèn)的情況下，都是72M的時(shí)鐘；

（2）TIM_TimeBaseStructure.TIM_RepetitionCounter=0;

是重復(fù)計(jì)數(shù)，就是重復(fù)溢出多少次才給你來一個(gè)溢出中斷,

它對應(yīng)的寄存器叫TIM1 RCR.

如果這個(gè)值不配置,上電的時(shí)候寄存器值可是隨機(jī)的,本來1秒中斷一次,可能變成N秒中斷一次,讓你超級頭大!

假設(shè)系統(tǒng)時(shí)鐘是72Mhz，TIM1是由PCLK2（72MHz）得到，TIM2-7是由PCLK1得到

關(guān)鍵是設(shè)定時(shí)鐘預(yù)分頻數(shù)，自動(dòng)重裝載寄存器周期的值

定時(shí)器的基本設(shè)置

1、 TIM_TimeBaseStructure.TIM_Prescaler = 7199;/時(shí)鐘預(yù)分頻數(shù) 例如：時(shí)鐘頻率=72/(時(shí)鐘預(yù)分頻 1)

2、TIM_TimeBaseStructure.TIM_Period = 9999; /自動(dòng)重裝載寄存器周期的值(定時(shí)時(shí)間) 累計(jì)0xFFFF個(gè)頻率后產(chǎn)生個(gè)更新或者中斷(也是說定時(shí)時(shí)間到)

3、 TIM_TimeBaseStructure.TIM_CounterMode = TIM1_CounterMode_Up;/定時(shí)器

模式 向上計(jì)數(shù)

4、TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; /時(shí)間分割值

5、TIM_TimeBaseInit(TIM2,TIM_TimeBaseStructure);/初始化定時(shí)器2

6、TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); /打開中斷 溢出中斷

7、TIM_Cmd(TIM2, ENABLE);/打開定時(shí)器

或者：

TIM_TimeBaseStructure.TIM_Prescaler = 35999;/分頻35999 72M/

(35999 1)/2=1Hz 1秒中斷溢出一次

TIM_TimeBaseStructure.TIM_Period = 2000; /計(jì)數(shù)值2000

((1 TIM_Prescaler )/72M)*(1 TIM_Period)=((1 35999)/72M)*(1 2000)=1秒*/

STM32通用定時(shí)器的基本定時(shí)器功能實(shí)現(xiàn)燈閃爍

#include stm32f10x.h

#include misc.h

void RCC_Configuration(void);

void NVIC_Configuration(void);

void GPIO_Configuration(void);

void TIM3_Configuration(void);

int main(void)

{

RCC_Configuration();

NVIC_Configuration();

GPIO_Configuration();

TIM3_Configuration();

TIM_ClearFlag(TIM3, TIM_FLAG_Update);

TIM_ARRPreloadConfig(TIM3, DISABLE);

TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

TIM_Cmd(TIM3, ENABLE);

while (1) {

;

}

}

void TIM3_Configuration(void)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_TimeBaseStructure.TIM_Period = 9999;

TIM_TimeBaseStructure.TIM_Prescaler = 7199;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM3,TIM_TimeBaseStructure);

}

void RCC_Configuration(void)

{

SystemInit();

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

}

void NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(NVIC_InitStructure);

}

void GPIO_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOC, GPIO_InitStructure);

}

#include stm32f10x_it.h

void TIM3_IRQHandler(void)

{

if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) {

TIM_ClearITPendingBit(TIM3, TIM_IT_Update);

GPIO_WriteBit(GPIOC, GPIO_Pin_7, (BitAction)(1 -GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_7)));

}

}