原创 STM32通用定时器的基本定时器功能实现灯闪烁

 2009-7-28 17:11  4738 10 14 分类: MCU/ 嵌入式

/*MAIN.C*/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "misc.h"

/* Private function prototypes -----------------------------*/
void RCC_Configuration(void);
void NVIC_Configuration(void);
void GPIO_Configuration(void);
void TIM3_Configuration(void);

/* Private functions ------------------------------------------*/

/**
* @brief Main program
* @param None
* @retval : None
*/
int main(void)
{
RCC_Configuration();
NVIC_Configuration();
GPIO_Configuration();
TIM3_Configuration();

while (1) {
;
}
}
/**
* @brief Configures TIM3
* @param None
* @retval : None
*/
void TIM3_Configuration(void)
{

/*每1秒发生一次更新事件(进入中断服务程序)。RCC_Configuration()的SystemInit()的RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2表明TIM3CLK为72MHz。因此，每次进入中断服务程序间隔时间为((1+TIM_Prescaler )/72M)*(1+TIM_Period )=((1+7199)/72M)*(1+9999)=1秒 */

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 7199;
TIM_TimeBaseStructure.TIM_Prescaler = 9999;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);/*此函数的语句"TIMx->EGR = TIM_PSCReloadMode_Immediate;"以软件方式产生更新事件(注:当发生一个更新事件时，所有的寄存器都被更新，硬件同时(依据URS位)设置更新标志位(TIMx_SR寄存器中的UIF位)。)。*/

TIM_ClearFlag(TIM3, TIM_FLAG_Update);/*清除更新标志位*/
TIM_ARRPreloadConfig(TIM3, DISABLE);/*预装载寄存器的内容被立即传送到影子寄存器 */

TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM3, ENABLE);
}

/**
* @brief Configures the different system clocks.
* @param None
* @retval : None
*/
void RCC_Configuration(void)
{
SystemInit();

/* TIM3 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

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

}
/**
* @brief Configures NVIC.
* @param None
* @retval : None
*/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

/* Enable the TIM3 gloabal Interrupt*/
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);
}
/**
* @brief Configure the TIM3 Ouput Channels.
* @param None
* @retval : None
*/
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);

/*注:不用为实现通用定时器的基本定时器功能配置Pin*/
}

/*stm32f10x_it.c*/

/* Includes -------------------------------------------------*/

#include "stm32f10x_it.h"

void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) {
  /* Clear TIM3 update interrupt */
  TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
  GPIO_WriteBit(GPIOC, GPIO_Pin_7, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_7)));
}
}

/*注:stm32f10x_stdperiph_lib_v3.0.0 编译器：MDK3.24A*/

/*软件仿真:首次进入中断Sec为1.00016507,第二次进入中断Sec为2.00016507，因此2.00016507-1.00016507=1*/