- #include "stm32f10x.h" t+ r) a1 |' @/ l
- void STM32_TIM_GPIO_Configuration(void)& t, n: \+ ~' P( {$ M- i
- {
9 V; _$ ]: k8 ?- v6 K |5 S# ?$ q. R* `: u - GPIO_InitTypeDef GPIO_InitStructure;# y: B) C' K$ r3 ^% x! `3 \( A
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) K8 l3 Q7 J% U - RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);7 b0 ~, x! [: `& I
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- <img src="https://www.stmcu.org.cn/module/forum/forum.php?mod=image&aid=390764&size=300x300&key=c2083d0c105d5af9&nocache=yes&type=fixnone" aid="attachimg_390764" alt="" border="0">
3 D: k. }- e+ t; R- | - //这里TIM3的通道1是GPIOA_Pin_6,通道2是GPIOA_Pin_7;通道3是GPIOB_Pin_0;
% K* s3 c. C) p; z - //这里TIM3的通道4是GPIOB_Pin_1;
, j* B3 r1 {7 m" l - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- W/ g& `9 M" Q \7 A( V, S4 t - //使用PWM的功能需要设置成AF_PP模式
$ d+ C) b0 ?, z% I) U+ K - GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- d+ L: P, ?' `3 A4 L4 Q - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;5 D; @5 _9 o0 ]7 L- W5 {
- GPIO_Init(GPIOA,&GPIO_InitStructure);3 s2 P$ v# T; M) j4 t; q
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; P$ b# C- L* l - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
' G5 u" A3 x4 u - GPIO_Init(GPIOB,&GPIO_InitStructure);
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- void NVIC_TIM3Configuration(void)//配置TIM3的优先级
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m$ l. t* p8 o9 E% a* @ - NVIC_InitTypeDef NVIC_InitStructure;+ s/ R" U( }6 |: I
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- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
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- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;4 l, J; m* U! }3 R( {& R2 N+ I
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
( h0 {/ W+ a# f! O" m - NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
' K+ _; b: k0 J# F1 c - NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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/ K( n y( m* [ - NVIC_Init(&NVIC_InitStructure);
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- TIM3_PWM_Init(void)
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- TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;//TIM定时器的配置3 @/ |% m! d8 J% b5 v, d0 _
- TIM_OCInitTypeDef TIM_OCInitStructure;//TIMPWM的
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4 o, o$ Q; v9 P) q1 v% y5 _+ R - RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);+ W( r& u- A' b X: b7 B: `) s2 c
- <img src="https://www.stmcu.org.cn/module/forum/forum.php?mod=image&aid=390765&size=300x300&key=561e9645b6d91c33&nocache=yes&type=fixnone" aid="attachimg_390765" alt="" border="0">$ J5 h( {7 u b- p; F
- //使能TIM3的时钟线;
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- TIM_TimeBaseInitStructure.TIM_Prescaler = 100-1;# C+ c# _) H+ N3 N& V. e4 {
- //分频;意思就是将72MHz的频率分成多少;这里是分成72M/100 = 720KHz了;
' o/ q% f7 t- H% |; D$ ~ - TIM_TimeBaseInitStructure.TIM_Period = 720-1;9 X: Y/ S3 Y5 ^7 W% S% l3 J
- //这个是定时器需要计数的最大位置;就是从0计数到Period;1 R. b* Y0 I/ N& ?2 Z: g5 `+ {2 X
- //这里的预分频系数(Presecaler)和预装值(Period)的乘积 表示频率;4 ]% ]6 Z1 V$ p, o$ R
- TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
- e1 w$ C7 V9 r# V8 z/ v( y - //这个是定时器计数的模式,可以向下计数,也可以向上计数;/ J1 }; [: i9 j7 t9 O" `. z1 S
- TIM_TimeBaseInitStructure.TIM_ClockDivision = 0; b8 y: l! B6 D
- //这个是预分频系数,一般不去操作它;& j$ J0 e ~" Q6 V
- TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);
9 o" x- B4 A" A* ^) u, k, X - //初始化TIM3
2 G3 v) Q* @' ~+ p* Q' e# @. E - TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;( b0 o, {- U( D- x4 W/ k/ H, ~
- //这个是定时器的模式;在这里使用的是PWM功能;( p& ~0 u8 O1 a
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;& P; l# l0 `. v. y/ _6 r# u
- //这个是比较输出使能;意思就是到底输不输出到相应的引脚;, v% ^1 M! i. v! f+ Q1 j, p4 m T% ~
- TIM_OCInitStructure.TIM_Pulse = 600;
5 y4 E# p) Y1 q2 P& @ - //这个是比较捕获的脉冲数就是在一个周期中捕获多少个1(0);这里Pulse/Period就代表的是占空比;
- q2 N& b# r1 V" n - TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;, B8 e, U% r3 \$ C
- //这个是输出极性:这里选择的是输出极性高,当然你也可以设置Low;. n* P1 U) L' f# B3 J
- TIM_OC1Init(TIM3,&TIM_OCInitStructure);' h! T5 g! H! [1 @& J/ S! \- [
- //初始化通道1;. k& a, w. ^ Q
- TIM_OC2Init(TIM3,&TIM_OCInitStructure);
2 G4 q) X9 `* A' a0 U. G8 _# k - //初始化通道2;
, L: \) L+ v6 p( A+ `! F - TIM_OC3Init(TIM3,&TIM_OCInitStructure);
1 T2 _: t* V# o9 J$ K9 [+ \ j6 P - //初始化通道3;( s3 `, f8 h: u! }% k, ^
- TIM_OC4Init(TIM3,&TIM_OCInitStructure);
1 S F+ h& g8 K2 ^0 D - //初始化通道4;
8 {; [# m$ S: n$ U: I - TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);) T. E) q _9 p& A: {
- //使能或者失能 TIMx 在 CCR2 上的预装载寄存器) W$ n1 Y5 `7 z8 {' W
- TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);
8 a: w& d, M, z& E" g - //使能或者失能 TIMx 在 CCR2 上的预装载寄存器$ x/ |3 Q8 ~6 u" F* B4 h# B3 i
- TIM_OC3PreloadConfig(TIM3,TIM_OCPreload_Enable);
' w( D( p1 F7 F1 _' R - //使能或者失能 TIMx 在 CCR2 上的预装载寄存器
; \. y* _9 L5 g% c& N8 H- x - TIM_OC4PreloadConfig(TIM3,TIM_OCPreload_Enable);
4 N0 @2 _4 L& s4 D# U D' P5 u0 M3 x - //使能或者失能 TIMx 在 CCR2 上的预装载寄存器& N5 D5 c; |8 H- g n# t, Q
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- //TIM_ITConfig(TIM3,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4,ENABLE);
. r3 B8 R4 `# r7 a. I7 Z8 M - //使能标志位CC1,CC2,CC3,CC4
1 N; T6 P5 _6 d- N6 C" R6 } - TIM_Cmd(TIM3,ENABLE);
! u E) J; R5 s0 w3 h$ z$ Y - //使能TIM;
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2 q8 [: U7 h6 s- }7 q - // void TIM3_IRQHandler(void)
* p# |; M$ T" D( F+ N7 n. p - // {
& R9 F6 n L) K# T - // TIM_ClearITPendingBit(TIM3,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4);
" P1 B X& |3 I8 `3 Z - // Flag = 1;
+ S0 O/ I( E% U, k! N$ h$ I - // }
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" u3 l$ }! n4 F! Y; h4 _; Z- void Delay(uint32_t nCount)
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4 { x: s7 h$ o m% c8 G - while(--nCount);
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- int main()
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- uint16_t i=0;
/ d( f* U$ L8 y" ^) x' c - STM32_TIM_GPIO_Configuration();
, q" r$ {: B. s. q - NVIC_TIM3Configuration();: m9 r3 b. m6 C: G W5 l
- TIM3_PWM_Init();8 V0 P* E$ R L* Y) d! L
- while(1)" h# e$ v5 }1 Z! d6 v/ x
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- TIM3->CCR2 = 500;/ U9 ^% u* D3 r9 R5 b5 I: L9 o
- for(i=0;i<499;i++)1 [- J/ Q8 T a: k
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- Delay(0XFFFFF);2 f- M# Z: B4 e7 m, d8 D/ b% r
- TIM3->CCR2-=1;
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4 O9 }' v. |# _& X( c7 J - for(i=0;i<499;i++)" p' N: N6 {4 S. i% Q4 U' W# f
- {
`# {$ [$ D9 O$ T - Delay(0XFFFFF);3 M( i: D& Y" p
- TIM3->CCR2+=1;
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7 \4 b n; c I5 X3 d, _ - }终于调出PWM了,在这里不敢独享,分享给那些还在调试PWM的人;
复制代码 ; G7 U! _5 g! K$ ^
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