- #include "stm32f10x.h"9 b2 ^ u# p5 y( B. Z. c
- void STM32_TIM_GPIO_Configuration(void)& z L6 ^( |0 B! _
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- GPIO_InitTypeDef GPIO_InitStructure;2 g. e9 g1 X' [# N' n" P
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- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);' V! g. l$ H8 A8 p
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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">! W) W# k$ w l
- //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;: t# y8 a# Z! U0 o# Z
- //这里TIM3的通道4是GPIOB_Pin_1;
4 X: W, T, t' H$ o: N1 A - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;4 l' K# j, E( ? d" g, n
- //使用PWM的功能需要设置成AF_PP模式
& y/ b1 W" z L- T2 ^ O - GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
6 U! M1 g0 c& K9 Y, u1 a1 x( t" t - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;) z5 |( z3 d6 K/ O
- GPIO_Init(GPIOA,&GPIO_InitStructure);+ |& I; ^( s2 z4 w
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. K3 S$ J8 S. p9 Z - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;2 Q/ y- P4 I; F$ \
- GPIO_Init(GPIOB,&GPIO_InitStructure);# q; N. |4 Y( o, [1 ^7 ^
- }
7 L$ P9 B) ]: n0 @" k e - void NVIC_TIM3Configuration(void)//配置TIM3的优先级% S8 p; ]7 z* V, b5 o. V c
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- NVIC_InitTypeDef NVIC_InitStructure;
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" R( K4 I1 W6 c - NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);7 p* H0 a5 a4 \* v
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$ ]0 L2 R6 z0 D* n - NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;6 ?1 E# ^! L" @6 p
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
( ]; @% u% y! \; R1 d3 o - NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;! b: X3 P+ c5 f% T+ C
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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2 J8 G& p2 F; [) [; v - NVIC_Init(&NVIC_InitStructure);
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$ D" R7 M, B1 p }8 E" q3 Y- TIM3_PWM_Init(void)! r5 u4 f5 a4 o$ I
- {
! ~% j$ Y% v% ] - TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;//TIM定时器的配置" j. K" B* s. p+ m
- TIM_OCInitTypeDef TIM_OCInitStructure;//TIMPWM的
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* x, K1 \ d2 b - RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);% v6 a( C) z s0 y* o+ l
- <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">( i" `) J5 h- A8 ^: S1 h" A
- //使能TIM3的时钟线;
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8 l' }5 v/ i. H+ x - TIM_TimeBaseInitStructure.TIM_Prescaler = 100-1;* {9 V+ P- Z! F1 |
- //分频;意思就是将72MHz的频率分成多少;这里是分成72M/100 = 720KHz了;
% Q/ H, H: |4 `0 i" q/ c - TIM_TimeBaseInitStructure.TIM_Period = 720-1;
! M4 \1 v; f1 D8 D9 O' W! s - //这个是定时器需要计数的最大位置;就是从0计数到Period;& y" p$ U! d" `8 e: b0 S1 q' K
- //这里的预分频系数(Presecaler)和预装值(Period)的乘积 表示频率;! W: M6 F) n) L4 F3 T5 k# w
- TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;9 N; J5 p6 g$ ?
- //这个是定时器计数的模式,可以向下计数,也可以向上计数;" H4 a; {% _0 n
- TIM_TimeBaseInitStructure.TIM_ClockDivision = 0;. t& H- j% ^+ Q: \) e/ y4 J3 q
- //这个是预分频系数,一般不去操作它;
, G- Q( _: k0 }3 l* x, \6 G - TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);
" i: i0 {# }* f& k3 [ - //初始化TIM37 }! {: }% p3 M' [ s+ r3 P1 I
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;7 `$ |. t5 ?! W- w" [
- //这个是定时器的模式;在这里使用的是PWM功能;
* q2 g8 t; e- w$ U* }8 y8 N, O - TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;. g V# Z2 F" ~& b
- //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;
) Y z, |9 Q7 [" L) U - TIM_OCInitStructure.TIM_Pulse = 600;
* Z! F9 P4 }- K5 t - //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;; i2 g2 R: B( v8 B/ K; h% n
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;) Y; P2 d; o. n& w1 ~/ e9 b0 S
- //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;4 b/ K$ `( D6 g2 Q# `- b- B
- TIM_OC1Init(TIM3,&TIM_OCInitStructure);/ B) K2 c( N8 S5 [0 v
- //初始化通道1;
: `0 E$ ]" `2 N: @! K/ W - TIM_OC2Init(TIM3,&TIM_OCInitStructure);
1 m t* Q; F. P; W% t - //初始化通道2;
( u& G1 S4 n4 `8 p; t- [# Z$ V: c - TIM_OC3Init(TIM3,&TIM_OCInitStructure);
, X+ H/ g, u6 `& H - //初始化通道3;. P- V/ ~7 t$ T( d1 d- t
- TIM_OC4Init(TIM3,&TIM_OCInitStructure);# M0 W+ v1 z4 i7 H& v" t( w% U" l
- //初始化通道4;
( T1 j: Q7 Y: z - TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);
# y" x" r/ R3 p - //使能或者失能 TIMx 在 CCR2 上的预装载寄存器! j* |3 } r* e) U3 P& `4 j; S% D
- TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);, x! _7 L9 \; K- B5 Z8 [
- //使能或者失能 TIMx 在 CCR2 上的预装载寄存器* J2 Y. b* d2 I1 Z ?
- TIM_OC3PreloadConfig(TIM3,TIM_OCPreload_Enable);5 v3 h8 W9 i* n* X
- //使能或者失能 TIMx 在 CCR2 上的预装载寄存器
- y/ B$ } U+ f4 z% B - TIM_OC4PreloadConfig(TIM3,TIM_OCPreload_Enable);- h6 W6 G$ g. e" |0 Y6 c$ }
- //使能或者失能 TIMx 在 CCR2 上的预装载寄存器
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- //TIM_ITConfig(TIM3,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4,ENABLE);
) L( y0 z7 p' ^3 m9 K - //使能标志位CC1,CC2,CC3,CC4
% y( e# |; b8 f" S - TIM_Cmd(TIM3,ENABLE);2 j6 X \# n$ w5 R/ Q2 j# U Q B0 }' g
- //使能TIM;
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[' m4 ?# C: Q. h J% H$ s - // void TIM3_IRQHandler(void)
; J1 J1 R) Z" z2 V5 _* E - // {' \6 V- n8 N- f6 S1 q' g
- // TIM_ClearITPendingBit(TIM3,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4);
' C8 N1 t8 I a/ B, d' L1 l& x! Y$ J - // Flag = 1;9 q9 A/ t8 ?/ ?( F/ b ^& U. ~1 \
- // }& N' ]- J* |! \* F+ q; v2 F
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- void Delay(uint32_t nCount)
: J3 \3 W% p/ A+ v8 [$ R& |7 p - {
9 c3 l* J7 \1 A/ D3 e - while(--nCount);+ o' M4 u9 A( a( _' B/ R: q
- }
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- int main()2 I j0 ?5 y. w/ y. B" ]
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- uint16_t i=0;: V! o% o m3 \ R% u# N- A3 e
- STM32_TIM_GPIO_Configuration();, ~7 B+ O, V) b, Z$ _5 V
- NVIC_TIM3Configuration();- u2 x/ ~+ J& X( D
- TIM3_PWM_Init();
# o( m9 |* l+ E4 H - while(1)
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- TIM3->CCR2 = 500;/ F; s( f% I6 A j% H4 N# P
- for(i=0;i<499;i++)6 \# K6 y- K; C# h9 q* K) B
- {
% j/ o: ~- w% B* L( a! }1 S - Delay(0XFFFFF);* f1 W- O2 E6 A7 s N
- TIM3->CCR2-=1;2 ~7 o/ @0 i7 ]6 e
- }
6 K: h! B4 c1 f' D - for(i=0;i<499;i++)
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- Delay(0XFFFFF);
?1 K0 x! o+ W4 n2 z+ _ - TIM3->CCR2+=1;" n( [* l7 o7 C8 m* c
- }
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- }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
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