#include "stm32f10x.h"
uint16_t TIM_Count;
#define LED1 1
#define LED3 3
void LEDXToggle(uint8_t ledx);
void TIM2_delay(u16 time);
int main()
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_13;//?????GPIO??
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //?????????????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//???????50MHZ
GPIO_Init(GPIOC, &GPIO_InitStructure);//?????,???GPIO
TIM_TimeBaseInitTypeDef TIM_BaseInitStructure; //¶¨ÒåÒ»¸ö¶¨Ê±Æ÷½á¹¹Ìå±äÁ¿
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //ʹÄܶ¨Ê±Æ÷2
TIM_DeInit( TIM2);//½«IM2¶¨Ê±Æ÷³õʼ»¯Î»¸´Î»Öµ
TIM_InternalClockConfig(TIM2);//ÅäÖà TIM2 ÄÚ²¿Ê±ÖÓ
TIM_BaseInitStructure.TIM_Period = 1000;//ÉèÖÃ×Ô¶¯ÖØÔؼĴæÆ÷ֵΪ×î´óÖµ 0~65535Ö®¼ä 1000000/1000=1000us=1ms
//TIM_Period£¨TIM1_ARR£©=1000£¬¼ÆÊýÆ÷ÏòÉϼÆÊýµ½1000ºó²úÉú¸üÐÂʼþ£¬¼ÆÊýÖµ¹éÁã Ò²¾ÍÊÇ 1MS²úÉú¸üÐÂʼþÒ»´Î
TIM_BaseInitStructure.TIM_Prescaler = 71;//×Ô¶¨ÒåÔ¤·ÖƵϵÊý£¬Ìṩ¸ø¶¨Ê±Æ÷µÄʱÖÓ 0~65535Ö®¼ä
//ÉèÖÃÔ¤·ÖƵÆ÷·ÖƵϵÊý71£¬¼´CK_INT=72M, TIM1_CLK=72/72=1MHz
TIM_BaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; //ʱÖÓ·Ö¸îΪ0
TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
//TIMÏòÉϼÆÊýģʽ ´Ó0¿ªÊ¼ÏòÉϼÆÊý£¬¼ÆÊýµ½1000ºó²úÉú¸üÐÂʼþ
TIM_TimeBaseInit(TIM2, &TIM_BaseInitStructure); //¸ù¾ÝÖ¸¶¨²ÎÊý³õʼ»¯TIMʱ¼ä»ùÊý¼Ä´æÆ÷
TIM_ClearFlag(TIM2, TIM_FLAG_Update);//ÇåÖжϣ¬ÒÔÃâÒ»ÆôÓÃÖжϺóÁ¢¼´²úÉúÖжÏ
TIM_ARRPreloadConfig(TIM2, DISABLE);//½ûÖ¹ARR ԤװÔØ»º³åÆ÷
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);//ʹÄÜTIM2ÖжÏÔ´
TIM_Cmd(TIM2, ENABLE);//TIM2×Ü¿ª¹Ø£º¿ªÆô
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //ÉèÖÃÖжÏ×éΪ2
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //ÖжÏʼþΪTIM2
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //ÇÀÕ¼ÓÅÏȼ¶0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //ÏìÓ¦ÓÅÏȼ¶1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //ÔÊÐíÖжÏ
NVIC_Init(&NVIC_InitStructure);
}
void LEDXToggle(uint8_t ledx)
{
GPIOC->ODR^=GPIO_Pin_13;
}
void TIM2_IRQHandler(void)
{
static uint16_t count=0;
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //ÅжÏÖжϱê־λÊÇ·ñΪ1£»Îª1ÔòÖжÏÏìÓ¦À²£¬0ÔòûÓÐ
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update); //Çå³þÖжϹÒÆðλ
count++;
TIM_Count--; //¶¨Ê±ÑÓʱ±äÁ¿¼õ1
if(count==500) //¼ÆÊýµ½500ms
{
LEDXToggle(LED1); //ÒÔ0.5ÃëµÃÖÜÆÚÉÁ˸
count=0; //¼ÆÊýÇåÁã
}
}
}
void TIM2_delay(u16 time)
{
TIM_Count = time;
while(TIM_Count);
}
