设置PA7 作为 PWM输出4 e/ m0 z, C5 b0 l
- void TIM_IO_Config(void)
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- GPIO_InitTypeDef GPIO_InitStructure;4 h+ \( r. p' _5 z$ |
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- RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);# F" @! B6 Q" J* _* _
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;//7 o" G4 H) P9 v6 Z
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;; g- f# W, I! D7 m) @$ f
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;4 i- S6 o+ A" Y1 W3 a) W
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;1 P5 a/ D5 N( N* h
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;( j0 r+ W% l/ u
- GPIO_Init(GPIOA, &GPIO_InitStructure);" E4 y5 }. ^4 L
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);
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) z9 Y" i+ a" S8 D, ? `/ w6 r$ \ - 设置Timer1 为PWM模式,使能,使能PWM输出
3 e o r# c6 D+ D8 u* y - void TIM_PWM_Config(void)" f9 e8 N# |1 a! ~/ Q. o) X
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- TimerPeriod = (SystemCoreClock / 17570 ) - 1;
8 y. C. c5 k1 \0 j. \9 g - /¼ÆËãCCR1 Ìøתֵ ÔÚÕ¼¿Õ±ÈΪ50%ʱ/
( b: Y) k/ |+ \- P - Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);1 V# D% I d& [2 S
- /* TIM1 ʱÖÓʹÄÜ /3 e/ s" n: o v, r1 Q& d2 D. v3 _
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);# E0 W# Z7 r/ w7 ~: m
- / Time ¶¨Ê±»ù´¡ÉèÖÃ*/
! `' f; l7 W. ^! J - TIM_TimeBaseStructure.TIM_Prescaler = 0;
8 M) ]9 A+ _4 J7 O$ | - TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; /* Time ¶¨Ê±ÉèÖÃΪÉÏÉýÑؼÆËãģʽ*/5 \% o# C& p; z' V: f& ^" y
- TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
1 e4 |# n' K: o' q+ B8 \" g - TIM_TimeBaseStructure.TIM_ClockDivision = 0;; u8 _+ i9 n8 w
- TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;$ E3 W# X2 D9 A( c8 G6 P& _
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- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);% ]! m' r5 V3 A" u
- /* ƵµÀ1£¬2£¬3£¬4µÄPWM ģʽÉèÖà */9 k" h% {0 K& e" i, K* r, M
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;$ Y5 E) e% C+ V$ U2 x
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; ^% o9 v* L( L7 I1 d
- TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;6 D! J) W" P& x
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;# ~3 K( n) h. @8 x* d
- TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;: V0 @$ w2 g0 K5 T! I
- TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;" s5 `. c% ]( S2 J- i) f* `/ L4 \
- TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;7 y0 R$ z: R% G9 N7 y6 D
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- TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//ʹÄÜƵµÀ1ÅäÖÃ( d. `2 @& d6 C) ]: J [
- TIM_OC1Init(TIM1, &TIM_OCInitStructure);. S' R/ c7 e; o, g7 Z$ a. n! E* Y
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- /* TIM1 ¼ÆËãÆ÷ʹÄÜ*/
: ?! p* j+ B5 f m - TIM_Cmd(TIM1, ENABLE);3 n0 Z1 \1 d+ R |# F( c( W
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- /* TIM1 Ö÷Êä³öʹÄÜ */
, n ?5 F2 x/ P8 e& h/ o - TIM_CtrlPWMOutputs(TIM1, ENABLE);
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复制代码
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