平时记性实在太差,调试完的程序,过两天又忘了,往往需要一阵子才能想起来,有时以前的资料找不到了,更是恼火,不得不重复到网上搜索。刚刚调试成功了一个类型的程序,立刻记下来,呵呵,不要又忘记了。7 Z. D f1 o. [& C+ ^
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STM32产生PWM是非常的方便的,要需要简单的设置定时器,即刻产生!当然,简单的设置对于新手来产,也是麻烦的,主要包括:
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7 L1 f1 |: _* A% `+ g+ |' m(1)使能定时器时钟:RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
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(2)定义相应的GPIO:
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* ]7 @' H4 K. h( \" W# l! @) r+ U- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6;
1 ~" i: s U f( w/ W" Z - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //下拉接地,检测输入的高电平) J+ f% W4 O" U1 ~* w# G. l3 ~
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50M时钟速度$ _1 c* {+ ?) Q/ r% W, L3 t
- GPIO_Init(GPIOA, &GPIO_InitStructure);* t1 Y* c Z! v& i Q1 \
, b0 ^4 G8 @' f0 o; m. o7 {( F- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
/ H% C' D' b( d; z6 k3 ^: e9 n" y1 k - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; - t' v$ `4 ]) F. T
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50M时钟速度 ?4 B0 B; |8 ~' a
- GPIO_Init(GPIOA, &GPIO_InitStructure);
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& p# F* d1 }! q. p8 I( {(3)如果是产生PWM(频率不变,占空比可变),记得打开PWM控制,在TIM_Configuration()中。
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- TIM_Cmd(TIM3,ENABLE);( H! T, n9 q# x5 R5 d
! \. S I& b5 p {, l& t$ K- TIM_CtrlPWMOutputs(TIM1,ENABLE);
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利用定时器产生不同频率的PWM1 p5 M3 b! g3 ]2 t" ]! ^
& m1 M O9 M3 N3 k9 Z 有时候,需要产生不同频率的PWM,这个时候,设置与产生相同PWM的程序,有关键的不一样。
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7 ?+ b# J' E" a1 F, z(一) 设置的原理
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利用改变定时器输出比较通道的捕获值,当输出通道捕获值产生中断时,在中断中将捕获值改变,这时, 输出的I/O会产生一个电平翻转,利用这种办法,实现不同频率的PWM输出。
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(二)关键设置. {) B5 C U, L0 E
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在定时器设置中:TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable);
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1 Z! I- @' ]8 k) _在中断函数中: ; }, [ I. S _- B* y+ O
" y. L0 j. h, r3 J- w) M, Y- if (TIM_GetITStatus(TIM3, TIM_IT_CC2) != RESET)
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- TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);5 A2 k. J: ]4 Q. n$ o
- capture = TIM_GetCapture2(TIM3);1 {" j9 b$ {1 o/ _- {- {
- TIM_SetCompare2(TIM3, capture + Key_Value);
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一个定时器四个通道,分别产生不同频率(这个例子网上也有)2 L. [" B5 W: i; {
5 V! G5 s3 d/ S; N \6 j- <span style="background-color: white;">vu16 CCR1_Val = 32768;1 T+ J! l# k, t
- vu16 CCR2_Val = 16384;
8 j0 p% K X* R" t9 n& A, G - vu16 CCR3_Val = 8192;
. x9 z4 `+ I: y" H( |9 |' N - vu16 CCR4_Val = 4096;4 P/ x6 E" N4 E# C; Z
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- void TIM_Configuration(void)7 l4 B$ n3 o( t2 k% r5 M+ Y
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- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
( Y# y! ^+ P2 @0 n# ^9 m( o - TIM_OCInitTypeDef TIM_OCInitStructure;$ O4 h$ O7 O' B5 e) v8 x* [
, W( s# ~8 F1 t+ X" G- ^( X- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);$ ^9 K2 L* J) H& l2 n7 N
. B; E6 n+ I ?* O; e' t- TIM_TimeBaseStructure.TIM_Period = 65535; 0 ]8 g: s# h- W- f+ H" {; B* o" z8 Q
- TIM_TimeBaseStructure.TIM_Prescaler = 2; 9 t. M7 F" I. Z; Z
- TIM_TimeBaseStructure.TIM_ClockDivision = 0;
" S X8 [& H" H - TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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- TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);! H8 o8 R! U$ U1 j. y
1 M9 M- X/ i4 I2 |# w- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; //PWM模式2
4 y+ |5 G0 z* x - TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效, n' {: Y7 F4 q H
- TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道无效" @) b& A. S9 q5 R
- TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //占空时间
3 B7 l$ l) e9 K8 U - TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性
) j" R* B$ k8 A2 X8 ^( r9 r7 F+ G1 n - TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互补端的极性 M$ m+ w3 P. p& z! k( O3 E3 j
- TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;/ \1 l5 F3 m; [+ p$ O3 G
- TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;- n m4 F: ]" _3 j% P) _
% G3 N* o# p2 H- TIM_OC1Init(TIM2,&TIM_OCInitStructure); //通道1
2 |1 r; b* w! w4 l - TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);
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. ^# X+ }- p* t6 C/ [" Q' m* o- TIM_OCInitStructure.TIM_Pulse = CCR2_Val; //占空时间7 c' H, D V) d( U# U
- TIM_OC2Init(TIM2,&TIM_OCInitStructure); //通道2" E" o( w o+ T
- TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);
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7 a$ d9 j. R1 e- TIM_OCInitStructure.TIM_Pulse = CCR3_Val; //占空时间
6 H [' B0 [8 e, O+ _1 g9 O - TIM_OC3Init(TIM2,&TIM_OCInitStructure); //通道3
" c4 y! f$ @* e1 o - TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable); |+ J3 y8 i: ^9 ?. w$ ?8 m
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- TIM_OCInitStructure.TIM_Pulse = CCR4_Val; //占空时间
* x/ S, u( U$ q5 G' y" k) }, j9 U - TIM_OC4Init(TIM2,&TIM_OCInitStructure); //通道4* B9 F: {" J& a/ E% y' [3 Q7 R
- TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Disable);
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- TIM_Cmd(TIM2,ENABLE);
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- //TIM_CtrlPWMOutputs(TIM2,ENABLE);% F E* N9 \9 f8 Y1 ?! G
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4 u" ] C3 {" `( Y1 o - TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);6 G& n7 b! {! z1 M
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1 _: |1 S* V+ ]6 W! d8 \- void GPIO_Configuration(void)9 I( ? c3 J* v/ A
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# B3 f1 S; L+ v' s- N" J* n - GPIO_InitTypeDef GPIO_InitStructure;" C# Q: X% m" D9 N
7 |( B! r2 ?$ z9 c N1 b- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);9 c: f, F* Y# C
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
% J1 `$ [# m* n- ?1 Y4 W - RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
. k, k; [! K8 m" D! F% J2 J - RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;1 f8 R( @# e# v+ d
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; //开漏输出
) ~3 O' V* w5 \4 X0 O - GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50M时钟速度
, {6 [/ S8 o/ l- S - GPIO_Init(GPIOA, &GPIO_InitStructure); J6 F, I L- f- P
2 N& z# B' n7 W: B* C0 F) ~- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
" d0 V1 V. o+ s( \( a: Y# ? B L - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; //开漏输出
8 l, Y3 L6 u1 s4 o1 }& u3 H* V& U - GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50M时钟速度
+ b5 r6 Z0 j0 [# L6 R- Z - GPIO_Init(GPIOB, &GPIO_InitStructure);* R0 r* y7 s, N, @0 d
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;* [9 n; K4 d; b: p/ g2 s6 p
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
4 A: Z7 a% J, \) r - GPIO_Init(GPIOA, &GPIO_InitStructure);
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
1 M9 D/ I: ^' d. y3 e* A - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
; k( D1 v2 v4 [2 N) H, X - GPIO_Init(GPIOC, &GPIO_InitStructure);
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
& J& Z- E! J; h! J6 L - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
8 b& E( Y) t5 p$ \0 ?4 c: z3 W - GPIO_Init(GPIOB, &GPIO_InitStructure);
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
5 E; ]% k E. Q& w% V) J - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
) I, g W$ W# x, S - GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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- GPIO_Init(GPIOA, &GPIO_InitStructure);
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' ~# h2 j7 B1 Z( q& B9 V- void NVIC_Configuration(void)1 l: O6 _9 n& h3 Y8 X! j9 @
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- NVIC_InitTypeDef NVIC_InitStructure;% j" F' {/ j2 ]' T+ Z
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- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); z$ ~) }- g, a% g$ I4 }6 i
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- NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;7 ~1 p0 |; ?; n. P9 t( _
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;. i+ z g. P* D
- NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;4 H6 B6 ~) l3 T6 E% |' }; U
- NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
9 Z ]; ]7 i0 k' R4 e - NVIC_Init(&NVIC_InitStructure);" N7 F0 X8 ~+ C# O) Q. `
- }
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- u16 capture = 0;: o8 ?+ N# t$ V/ n) V
- extern vu16 CCR1_Val;
/ d, p, L- A! q" Y5 n; d: f9 z - extern vu16 CCR2_Val;; H; K0 |0 q( i: a. w/ o* G
- extern vu16 CCR3_Val;; @# f8 U/ {/ p/ h; A
- extern vu16 CCR4_Val;6 Y* T: H6 D. J7 m
( B9 [) s W8 G4 T n3 U- void TIM2_IRQHandler(void)
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- if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
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- TIM_ClearITPendingBit(TIM2, TIM_IT_CC1 );
. [3 p: J3 e& T0 p4 D: T3 X6 T* \ - capture = TIM_GetCapture1(TIM2);
; }( S7 H- W/ { U4 g- R - TIM_SetCompare1(TIM2, capture + CCR1_Val );
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- if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)
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; C8 G3 i9 K! J. M& f& U - TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);1 m( F- |, b5 J; j- c0 t
- capture = TIM_GetCapture2(TIM2);6 x& \! ^' J! D$ q& u E, z; X
- TIM_SetCompare2(TIM2, capture + CCR2_Val);6 Z6 K" n4 d! L+ x- b5 x \
- }
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- if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)! s4 `& G: ?' ], Z5 b0 u" O1 Q
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- TIM_ClearITPendingBit(TIM2, TIM_IT_CC3); D' {0 d* {7 x; M5 g+ A
- capture = TIM_GetCapture3(TIM2);0 ^" ~2 O0 l7 s1 h, q
- TIM_SetCompare3(TIM2, capture + CCR3_Val);
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- if (TIM_GetITStatus(TIM2, TIM_IT_CC4) != RESET)2 P( u0 F% r0 I* [6 }; y6 L
- {
& `/ y/ f+ |& S4 [, b0 |* v/ s - TIM_ClearITPendingBit(TIM2, TIM_IT_CC4);
3 P# D U [" O! s7 | - capture = TIM_GetCapture4(TIM2);9 u3 Q2 H+ Z4 ^( L( |& i
- TIM_SetCompare4(TIM2, capture + CCR4_Val);4 s5 ~2 C4 d K7 T& F
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一个定时器一个通道,产生不同频率
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% k, _5 a% H. [+ ]6 o* e其它的设置都一样,就是在主函数中修改一个参数,然后在定时器中断中,根据这个参数,改变频率。' a& ^* d1 Y7 x
* a# M" P% r: p0 I0 y& `1 M, A- <span style="background-color: white;">#include "stm32lib\\stm32f10x.h"& s6 O1 b; U8 z7 c/ s6 y
- #include "hal.h"
* p0 u% `( i% w; y6 s, W9 \ - volatile u16 Key_Value=1000; //用于保存按键相应的PWM波占空比值
, {# G# s. X" T5 `! C" ?, g - int main(void)
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- ChipHalInit();+ A& ?3 l( a$ _ H3 f
- ChipOutHalInit();) m! O4 D$ K4 ]! ]
- while(1)
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- if( (!Get_Key_Up)&(!Get_Key_Down)&(!Get_Key_Left)&(!Get_Key_Right)&(!Get_Key_Ctrl) )) G0 A* Z2 d( t' l7 y" Y" G$ H
- {4 {$ Q# W: x: r+ U4 Z6 `
- Key_Value=12000;
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- else8 \8 i( t; G2 w% j5 P- _( O5 }
- {
3 [: \1 N9 u% s& f; u) K+ Q; M2 P/ k - if(Get_Key_Up) //按键前进按下 ,对应1kHz$ x6 m1 m, ~/ Z) k, h2 f' I1 G$ I; H
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- Key_Value=6000;
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, _( K) l8 H% f+ i1 Y$ c4 B - else if(Get_Key_Down) //按键后退按下 ,对应2kHz
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& V3 Q3 n- `6 i4 A! q - Key_Value=3000;- r$ E8 q7 K/ X5 B) n! o5 E
- }
- d$ o0 _- p7 {/ Y8 _: C, O+ V9 \: y - Delay_Ms(20); //10ms延时- o+ X: U+ D5 F! @' L
4 E: A& X: T& [/ X# K: Q5 k/ R! y* b) ^, a- if(Get_Key_Left) //按键左转按下,对应3kHz
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( n' d/ h2 L0 A" ~5 ^% l - Key_Value=2000;3 U1 [) Z$ c1 }0 C! c
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- else if(Get_Key_Right) //按键右转按下,对应4kHz; Y% V" D! i6 h4 k/ Z/ u
- {- T' ^: D/ _6 a7 [6 \
- Key_Value=1500;" p0 ^ c' J/ H# j. g1 k, S! o
- }
& c& l& d/ s1 l& H7 h# q" p - Delay_Ms(20); //10ms延时' \" d- C- O& o& ~! _, H d6 B
! p) H4 y9 V* r+ N: V1 t- if(Get_Key_Ctrl) //按键控制按下,对应5kHz
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0 p# R; P! d7 S - Key_Value=1200;
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) ^7 u$ @1 W7 \2 }* J1 B2 X - Delay_Ms(20); //10ms延时: k7 Y, v; X) I" i
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- }
* @1 c3 Q* P1 u4 a& E8 t - extern volatile u16 Key_Value;5 V+ j" ^6 V2 I& E. x! g7 {
- u16 capture=0;
s, ~% D; b* b$ ^5 ]. X Z - void TIM3_IRQHandler(void)
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- 3 s, q/ _9 T0 {1 O2 o0 v$ l
- if (TIM_GetITStatus(TIM3, TIM_IT_CC2) != RESET)0 J* D3 S( j0 b* X
- {2 E& t N) q: Z
- TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);* i' ?6 x* Y6 b4 @) H' [
- capture = TIM_GetCapture2(TIM3);
0 h9 C. {* }" K - TIM_SetCompare2(TIM3, capture + Key_Value);
* M1 V2 h# v- Y0 @5 m - }
0 G: J" F$ ?( D! w6 W+ f - }
( ?3 D0 ^% R: }7 C9 k+ N* J - void TIM3_Configuration(void)
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- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
# q# _: `4 D, Y - TIM_OCInitTypeDef TIM_OCInitStructure;
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. a' J, Z( }! Q& g0 ~$ u3 i4 x$ \- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
- H4 c/ _# e% t4 T1 l% _( Z
) y- n/ t8 o1 u" ] J- TIM_TimeBaseStructure.TIM_Prescaler = 5; //预分频(时钟分频)72M/6=12M( g0 k- b' Z7 f" c
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数9 ]2 J2 c+ ~5 _
- TIM_TimeBaseStructure.TIM_Period = 65535; //装载值选择最大8 }0 x: x: v+ v2 k+ I
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
' ]" D1 z, z1 e8 g' [( h1 A0 e - TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
( q1 ]: O' i; ]; `9 n - TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);, D( {' H1 P# ?$ f: L5 Q
- ' |4 B. I, y. W6 M: n+ H7 B
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; //PWM模式2# [/ v' l( i: T6 P9 w# R
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效0 X' [ v- O$ e X n
- TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道无效
- z8 A* p* l/ e! N! | - TIM_OCInitStructure.TIM_Pulse = Key_Value; //占空时间( O; m4 e5 z7 B3 S0 U
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性
, g" Q9 p. T' N. N! a - TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互补端的极性+ D, w- T2 }- w
- TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
) S8 O* D- f9 W" |9 q, T - TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
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% G5 e7 s N+ O3 n5 Y- Y4 J- K2 N- TIM_OC2Init(TIM3,&TIM_OCInitStructure); //通道2* N, K& D; A3 s7 X
- TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable);2 L3 J. A" B) L5 e; V* J z
$ t1 ~- h- Q9 a8 X9 j( u9 F7 r! v* n- TIM_Cmd(TIM3,ENABLE);
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- //TIM_CtrlPWMOutputs(TIM1,ENABLE);
+ \( C V8 l# V5 R5 u0 e - TIM_ITConfig(TIM3, TIM_IT_CC2 , ENABLE);3 v8 w6 j. X: S& D1 e. J* z
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- </span>
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转自:牛牛的博客 |