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楼主 |
发表于 2017-3-29 13:54:16
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void LED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOE, ENABLE);//ê1ÄüPB,PE¶Ë¿úê±Öó
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //LED0-->PB.5 ¶Ë¿úÅäÖÃ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //íÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO¿úËù¶èÎa50MHz
GPIO_Init(GPIOB, &GPIO_InitStructure); //¸ù¾Yé趨2Îêy3õê¼»ˉGPIOB.5
GPIO_SetBits(GPIOB,GPIO_Pin_5); //PB.5 êä3ö¸ß
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //LED1-->PE.5 ¶Ë¿úÅäÖÃ, íÆíìêä3ö
GPIO_Init(GPIOE, &GPIO_InitStructure); //íÆíìêä3ö £¬IO¿úËù¶èÎa50MHz
GPIO_SetBits(GPIOE,GPIO_Pin_5); //PE.5 êä3ö¸ß
}
void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //ê±Öóê1Äü
//¶¨ê±Æ÷TIM33õê¼»ˉ
TIM_TimeBaseStructure.TIM_Period = arr; //éèÖÃÔúÏÂò»¸ö¸üDÂê¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔØ¼Ä′æÆ÷ÖüÆúμÄÖμ
TIM_TimeBaseStructure.TIM_Prescaler =psc; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIMÏòéϼÆêyÄ£ê½
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ¥λ
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //ê1ÄüÖ¸¶¨μÄTIM3ÖD¶Ï,ÔêDí¸üDÂÖD¶Ï
//ÖD¶ÏóÅÏè¼¶NVICéèÖÃ
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //ÏèÕ¼óÅÏè¼¶0¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //′óóÅÏè¼¶3¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure); //3õê¼»ˉNVIC¼Ä′æÆ÷
TIM_Cmd(TIM3, ENABLE); //ê1ÄüTIMx
}
//¶¨ê±Æ÷3ÖD¶Ï·tÎñ3ìDò
void TIM3_IRQHandler(void) //TIM3ÖD¶Ï
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //¼ì2éTIM3¸üDÂÖD¶Ï·¢éúóë·ñ
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //Çå3yTIMx¸üDÂÖD¶Ï±êÖ¾
GPIO_ResetBits(GPIOB,GPIO_Pin_5);
}
}
int main(void)
{
SystemInit ();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //éèÖÃNVICÖD¶Ï·Ö×é2:2λÇàÕ¼óÅÏè¼¶£¬2λÏìó|óÅÏè¼¶
LED_Init(); //LED¶Ë¿ú3õê¼»ˉ
TIM3_Int_Init(4999,7199);//10KhzμļÆêyÆμÂ꣬¼Æêyμ½5000Îa500ms
while(1)
{
}
} |
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