- #include "stm32f10x.h": u' D3 b3 Q& M, P
- void STM32_TIM_GPIO_Configuration(void)7 P3 n9 S0 M- ~* A: c
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- GPIO_InitTypeDef GPIO_InitStructure;" v. R i3 Y9 R8 }
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! [5 q5 W5 q# G; v/ O - RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);% H# f! M% g. q0 C4 J
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- <img src="https://www.stmcu.org.cn/module/forum/forum.php?mod=image&aid=390763&size=300x300&key=ccf1e09fa4605482&nocache=yes&type=fixnone" aid="attachimg_390763" alt="" border="0">
3 T- ~" D9 U: P' B1 g - <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">
, l5 y2 \$ l* J7 k4 k - //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;. f: b) Q& m6 A/ S3 d
- //这里TIM3的通道4是GPIOB_Pin_1;
# S. O% }/ ?: |/ ^ - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
6 c) k8 B) F( g( E - //使用PWM的功能需要设置成AF_PP模式" D! F5 z- V/ L7 j& v
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
* I; u4 W& Y' a( R D& `5 d - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;" j6 \' D2 D6 Q5 e
- GPIO_Init(GPIOA,&GPIO_InitStructure);- w- D, l1 A( K& B d: l
-
; @ _2 x5 p' D$ a4 p1 s - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
' w& `3 m" u0 r - GPIO_Init(GPIOB,&GPIO_InitStructure);
* C4 [4 P, r/ C7 ^3 r - }
7 @& I/ @& h" O - void NVIC_TIM3Configuration(void)//配置TIM3的优先级* K1 n3 [, I U9 ]" m" w
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- NVIC_InitTypeDef NVIC_InitStructure;& M7 X$ A- x9 L1 Z
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1 D! E# i7 Z. ~9 q - NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
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& o' j4 [7 Z3 z: Z - NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
; v) @$ L7 a4 n( Q% U - NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;- ?$ k" k0 K- J3 Z/ F
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
( n5 z% f- [& K" } - NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;& y- l/ B: I( ]3 g8 t: v
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7 j# k( `7 G6 z - NVIC_Init(&NVIC_InitStructure);, L" o3 Z6 ?+ w9 K+ ^1 v* M. O# I. |7 y
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- TIM3_PWM_Init(void)' t4 K( i+ b7 |4 t% |1 R
- {
! v7 P4 d& B3 o" t - TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;//TIM定时器的配置
/ W9 J5 F9 Y9 f - TIM_OCInitTypeDef TIM_OCInitStructure;//TIMPWM的4 g$ \+ g# O/ M) S) `
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- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
) M2 `* `5 ?3 M, Q - <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">
" j6 r8 x+ v |% c% K: f - //使能TIM3的时钟线;& l8 }1 v& W" P& x0 w, U7 v. V+ P
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& G; ~0 ?1 ?. p9 z5 V - TIM_TimeBaseInitStructure.TIM_Prescaler = 100-1;& J! U) W5 t3 W {+ a1 R$ ^
- //分频;意思就是将72MHz的频率分成多少;这里是分成72M/100 = 720KHz了;* h: p. U6 t/ w- X3 C# Y2 m
- TIM_TimeBaseInitStructure.TIM_Period = 720-1;
3 m- j9 l- q- [7 J - //这个是定时器需要计数的最大位置;就是从0计数到Period;
# ^/ }5 e! K* q' }0 H+ ~% g$ | - //这里的预分频系数(Presecaler)和预装值(Period)的乘积 表示频率;
- r `/ _& P' G0 ?' F }" s5 y3 c - TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
8 P/ U! b, H- S) s" m* K - //这个是定时器计数的模式,可以向下计数,也可以向上计数;" p$ ^9 U) O0 G. k/ w8 V2 G
- TIM_TimeBaseInitStructure.TIM_ClockDivision = 0;
2 j+ f5 u; }) p# b; |, r3 j - //这个是预分频系数,一般不去操作它; H. a% z& A: }8 o7 ]) E! W
- TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);3 P$ `- }, t! `1 r( M- n5 ?
- //初始化TIM3
0 ]8 d/ T9 b0 I3 T% s$ l/ p - TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;2 y: Z" K2 X9 h5 o5 z
- //这个是定时器的模式;在这里使用的是PWM功能;
4 D3 V3 Y2 J( V - TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;$ S" m( m+ W& `& e8 D: D
- //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;& q( S/ W P7 a- d
- TIM_OCInitStructure.TIM_Pulse = 600;
. w7 b8 ]; |. ~2 n- S3 ^1 S - //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;
2 {: P' \- k( e - TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;/ m* i" R" X1 |" Y3 |
- //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;
1 X$ j- B2 h, K0 A, ~ - TIM_OC1Init(TIM3,&TIM_OCInitStructure);
% D: X6 l D, c% c% U2 ` - //初始化通道1;
8 |2 o1 d5 L1 k1 V# T6 z - TIM_OC2Init(TIM3,&TIM_OCInitStructure);( M3 Q1 N. r4 d. b# I1 j( ^
- //初始化通道2;* H8 e" F: W; H1 _- l# N
- TIM_OC3Init(TIM3,&TIM_OCInitStructure);
! @ V/ a4 v8 y/ y N1 y+ L - //初始化通道3;
2 Z5 u! i( Y/ {/ H+ _ - TIM_OC4Init(TIM3,&TIM_OCInitStructure);
1 }" Z4 T/ ]# z5 x) y1 q - //初始化通道4;
. N' v y9 B5 T) p - TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);
0 X. n4 z( ]% U0 ?3 A, V" k: I - //使能或者失能 TIMx 在 CCR2 上的预装载寄存器
. r" n$ `: h9 G6 | - TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);0 z+ r1 R3 f/ s7 Z& f1 J" I
- //使能或者失能 TIMx 在 CCR2 上的预装载寄存器% v6 T/ H5 N, b1 E
- TIM_OC3PreloadConfig(TIM3,TIM_OCPreload_Enable);; H( m( W0 c! b: e( V3 f. {
- //使能或者失能 TIMx 在 CCR2 上的预装载寄存器" w! d# t u3 ]9 c
- TIM_OC4PreloadConfig(TIM3,TIM_OCPreload_Enable);
! a3 z/ \2 m. J2 s* d9 ?; c8 k# d1 B - //使能或者失能 TIMx 在 CCR2 上的预装载寄存器/ B R* P) i! Y2 m; W5 ?
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) r5 S7 N! S6 C0 j7 k - //TIM_ITConfig(TIM3,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4,ENABLE);. p- r( D) T. ^
- //使能标志位CC1,CC2,CC3,CC40 u$ i6 `7 ?6 u3 d
- TIM_Cmd(TIM3,ENABLE);9 R+ J% m4 N6 a$ Z/ f
- //使能TIM; Y% |6 P; N( K' p
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- // void TIM3_IRQHandler(void)
# Z/ R; m& E3 w) W# J: k0 Y& D - // {/ O; f- q H" V. D( M; t% o0 U
- // TIM_ClearITPendingBit(TIM3,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4);
" A: `# X& p7 w - // Flag = 1;! H3 t0 S+ [9 u) h# G1 p/ C
- // }
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- void Delay(uint32_t nCount)
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- while(--nCount);
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- int main()7 @& ?$ J* A+ `2 E/ h
- { # o" H% m* z- l# A) F: t
- uint16_t i=0;6 G- j, J/ u" _
- STM32_TIM_GPIO_Configuration();
( `! T+ I2 R% [8 K - NVIC_TIM3Configuration();: \ B. A; V2 K% t
- TIM3_PWM_Init();
* E' G( Z- B0 {; \! a# b3 } - while(1)
- y7 n5 K [% i9 J& D* [* Y* n - {
: K/ K x6 u2 ?( K9 V% H. E) z! W' u - TIM3->CCR2 = 500;, m) W$ _. ]" d3 B
- for(i=0;i<499;i++)
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- Delay(0XFFFFF);
: J' x! d% k% z* G! G - TIM3->CCR2-=1;
% R2 E1 |8 h# W( |! C - }
9 n, Z- t( a7 h1 p - for(i=0;i<499;i++)- b f! E3 N* |+ p+ }' G" E
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- Delay(0XFFFFF);
& [: _/ V. U: A a% C; I% I! ] - TIM3->CCR2+=1;
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- }
3 @* N4 `5 l, t, j: E - }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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