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定时器配置; `5 I' G' B" k9 b+ O# z2 P void TIM3_Init(void) {* o- o5 A) v( b 9 @# l2 i9 h$ b4 V W9 ` TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);! D6 ?* }) `9 q TIM_DeInit(TIM3); 9 x. K, @7 e+ Q; A6 m/ M, ^ 9 `5 V' N# `; @# R1 a& j TIM_TimeBaseInitStruct.TIM_Prescaler=23999; . E; P) D# `+ b* C9 F% r5 O& ~- n TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up ;7 K% v$ r: S# d! [ TIM_TimeBaseInitStruct.TIM_Period=2000;4 V- l+ f ^8 b TIM_TimeBaseInitStruct.TIM_ClockDivision=0x0; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct); TIM_Cmd( TIM3, ENABLE); TIM_PrescalerConfig(TIM3, 23999, TIM_PSCReloadMode_Immediate); I) [) F7 A4 ~% R& _- h5 Z TIM_ClearFlag(TIM3, TIM_FLAG_Update); TIM_ITConfig(TIM3, TIM_IT_Update , ENABLE);7 t' ~/ e0 B% T- D# | g+ z4 B) _$ F; B; s# c } ! r; F W0 H* c6 z 中断 void Nvic_Init(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn ; NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;6 ?- z8 y( M1 |% g NVIC_Init(&NVIC_InitStructure); , W- \' c6 `* n$ X }6 Q$ t/ Q! ]; J/ h; v j ! s. G9 U9 }7 Y4 A5 ^ i void TIM3_IRQHandler(void)8 g# ~& z7 Y. L5 U' A+ N; K { if (TIM_GetITStatus(TIM3, TIM_IT_Update)!=RESET)6 y$ c8 n+ K8 z9 k# D, @) H {4 E5 c6 N; k0 b/ x$ q2 P& G TIM_ClearITPendingBit(TIM3, TIM_IT_Update); GPIO_WriteBit(LED_PORT, LED_PIN_1 , (BitAction)((1-GPIO_ReadOutputDataBit(LED_PORT, LED_PIN_1)))); }* b, l8 t% `5 r: w" W } int main(void) { 7 Q& [9 T6 U( n' v+ y2 O. n SystemInit(); 0 U1 v {$ \# } o LED_Init(); * C1 c1 U# P+ G9 q Nvic_Init(); TIM3_Init(); while(1) { 8 b" a3 _2 F5 J1 |4 g; ?, `( y } } 7 \) i% ]9 U3 |. i- ~6 _) W |
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