设置PA7 作为 PWM输出
: ~. @2 Y6 V1 K6 ~7 }- void TIM_IO_Config(void)0 a' M4 g8 A' h. m4 A0 _
- {
+ L& X6 J R/ q2 a6 z4 N, D- S* r - GPIO_InitTypeDef GPIO_InitStructure;2 \$ H7 f$ X' g% {
- X! q' X8 v1 L' r% P3 O6 i- RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);/ H9 z, m' ~4 s% P+ y* @0 o/ l
% T" e4 z1 C5 l4 K( Z- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;//; t. W) D# q8 u
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;% k* C f4 ]( ~. L7 `
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;% g* K- E( g& z$ a2 @
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
/ J# i1 [4 H a9 ~ l7 C u* Q - GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
, K) l: r' \- v: j8 n - GPIO_Init(GPIOA, &GPIO_InitStructure);
4 Q6 c- {8 |) T5 ?1 _' \2 [ - GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);
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- s3 W8 y5 s2 |5 n/ a; S, @ - 设置Timer1 为PWM模式,使能,使能PWM输出
7 ]! W6 z. v# \ - void TIM_PWM_Config(void)( y$ E, O/ c3 r1 a8 n
- {
3 @+ I* R$ Z& U - /¼ÆËãÔ¤¶¨±íµÄÖµ£¬Ò²¾ÍÊǶàÉÙ¸öʱÖÓ¼ÆÊýΪһ¸öÖÜÆÚ/6 f, h) c# J1 o4 n! b: [
- TimerPeriod = (SystemCoreClock / 17570 ) - 1;4 q. i: l6 h& y+ g Q2 }
- /¼ÆËãCCR1 Ìøתֵ ÔÚÕ¼¿Õ±ÈΪ50%ʱ/
. [, E, n0 Z" z/ Z. g0 ] - Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);+ o& B8 o! a9 `6 f
- /* TIM1 ʱÖÓʹÄÜ /& o& E, U9 |$ N* n% K( a+ {
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);
7 x$ ]& \, f1 g8 V+ E& t - / Time ¶¨Ê±»ù´¡ÉèÖÃ*/" D( m: r# g3 |. y1 S
- TIM_TimeBaseStructure.TIM_Prescaler = 0;
$ s, [% ^/ R: |) q$ z - TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; /* Time ¶¨Ê±ÉèÖÃΪÉÏÉýÑؼÆËãģʽ*/
7 k0 |) K' {! R - TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
* G5 K4 Z' v9 y4 l0 Z9 E! w - TIM_TimeBaseStructure.TIM_ClockDivision = 0;
! y0 U* _- ~, M b9 g - TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;6 Z6 n; }! U I- N+ I' Q! L
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- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
9 q* `5 _, N! X A! E2 P: k; f - /* ƵµÀ1£¬2£¬3£¬4µÄPWM ģʽÉèÖà */
$ R3 \1 P' ~: z - TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;3 c/ U5 O3 O: H, `% v- e' s
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;9 T" X* Z/ p5 i) W
- TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
- C% x/ J3 a' z; b( d* v+ e - TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;* b% ]7 {% c0 J1 \, Q
- TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
) y/ i S! G3 Z% m' j$ u - TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
. X' C& _3 J2 ~: b - TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;- n) C+ s0 f9 h& b c
9 B. f( e2 n6 k$ _- V% _- TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//ʹÄÜƵµÀ1ÅäÖÃ+ b0 a5 X6 ~! r4 I+ e* w
- TIM_OC1Init(TIM1, &TIM_OCInitStructure);/ D2 _1 z ]$ e* ?6 ^
! a/ |7 S9 Y* q) j- /* TIM1 ¼ÆËãÆ÷ʹÄÜ*/2 l2 S: @" ^; N/ G
- TIM_Cmd(TIM1, ENABLE);
, u" F% J: ^' }3 o+ A0 v, h" C - 3 Q6 a* Z4 n- b. g+ j3 H3 Z/ J% J
- /* TIM1 Ö÷Êä³öʹÄÜ */
- T- v. [- |" e- i( `5 r - TIM_CtrlPWMOutputs(TIM1, ENABLE);
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