stm32_timer基本定时器配置及实现灯闪烁

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Configure PC.06 as Output push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}

第四步：定时器配置，本章重点！

void TIM2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

//重新将Timer设置为缺省值
TIM_DeInit(TIM2);

//采用内部时钟给TIM2提供时钟源
TIM_InternalClockConfig(TIM2);

//预分频系数为36000-1，这样计数器时钟为72MHz/36000 = 2kHz
TIM_TimeBaseStructure.TIM_Prescaler = 36000 - 1;

//设置时钟分割
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_div1;

//设置计数器模式为向上计数模式
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

//设置计数溢出大小，每计2000个数就产生一个更新事件
TIM_TimeBaseStructure.TIM_Period = 2000;

//将配置应用到TIM2中
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

//清除溢出中断标志
TIM_ClearFlag(TIM2, TIM_FLAG_Update);

//禁止ARR预装载缓冲器
TIM_ARRPreloadConfig(TIM2, DISABLE); //预装载寄存器的内容被立即传送到影子寄存器

//开启TIM2的中断
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
}

该函数完成两个功能

1.设定预分频系数TIM_Prescaler=36000-1

2.设定自动重装载值TIM_Period=2000

注意：上述只是配置好了TIM2，但还没有开启TIM2。

下面给出timer2.c的完整代码

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void NVIC_Configuration(void);
void GPIO_Configuration(void);
void TIM2_Configuration(void);
void Delay(vu32 nCount);

/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif

/* Configure the system clocks */
RCC_Configuration();

/* NVIC Configuration */
NVIC_Configuration();

/* Configure the GPIO ports */
GPIO_Configuration();

/* Configure the TIM2 */
TIM2_Configuration();

TIM_Cmd(TIM2, ENABLE); //开启定时器2

/* Infinite loop */
while (1)
{
}
}

/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;

/* RCC system reset(for debug purpose) */
RCC_DeInit();

/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);

/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();

if (HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);

/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);

/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

/* Enable PLL */
RCC_PLLCmd(ENABLE);

/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {}

/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08) {}
}

/* Enable GPIOC clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

/* Enable TIM2 clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
}

/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

/* Enable the EXTI9_5 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Configure PC.06 as Output push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name : TIM2_Configuration
* Description : 每1秒发生一次更新事件(进入中断服务程序).
* Input : None
* Return : None
*******************************************************************************/
void TIM2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

//重新将Timer设置为缺省值
TIM_DeInit(TIM2);

//采用内部时钟给TIM2提供时钟源
TIM_InternalClockConfig(TIM2);

//预分频系数为36000-1，这样计数器时钟为72MHz/36000 = 2kHz
TIM_TimeBaseStructure.TIM_Prescaler = 36000 - 1;

//设置时钟分割
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_div1;

//设置计数器模式为向上计数模式
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

//设置计数溢出大小，每计2000个数就产生一个更新事件
TIM_TimeBaseStructure.TIM_Period = 2000;

//将配置应用到TIM2中
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

//清除溢出中断标志
TIM_ClearFlag(TIM2, TIM_FLAG_Update);

//禁止ARR预装载缓冲器
TIM_ARRPreloadConfig(TIM2, DISABLE); //预装载寄存器的内容被立即传送到影子寄存器

//开启TIM2的中断
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
}

/*******************************************************************************
* Function Name : Delay
* Description : Inserts a delay time.
* Input : nCount: specifies the delay time length.
* Return : None
*******************************************************************************/
void Delay(vu32 nCount)
{
for(; nCount != 0; nCount--);
}

#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_fai