基本计时功能' L: O0 k9 t: W3 h6 ]( g
最简单的,定时器嘛,基本的定时器就是定时功能,简单来说就是TIMx->CNT会跟随着输入时钟的脉冲而计数。
: n. U6 C `1 l' \! M I( p初始化定时器的参数,大家都好理解,因为TIM2的输入时钟是108Mhz,这里进行10800分频,输入频率为10K,重装载值设置为20K,每2秒溢出一次。' ^' V" k: G7 E. P+ h
在HAL_TIM_Base_Init的执行过程中,会先调用HAL_TIM_Base_MspInit再进行其他参数的配置,即先开时钟。" h3 z5 q( d/ d7 T% u6 i
- TIM_HandleTypeDef TIM2_Handler;; R- {# @* r+ \9 I
- static void MX_TIM2_Init(void)- ^( C3 h0 D9 v2 D% a. s
- {
6 E7 s+ Q" U% f0 q) X) Z& r - TIM2_Handler.Instance = TIM2;
7 r( F4 X0 L& X& O8 u - TIM2_Handler.Init.Prescaler = 10800;
: H$ i: @1 r" C2 d3 S - TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;# K' [( }4 Q2 g9 L! Y# M3 v8 ?
- TIM2_Handler.Init.Period = 20000;, E- ^; z" t v9 ~ q; z. e
- TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;# C8 Y& Z1 G+ K& {& D9 w
! u3 e _+ ?9 U: I+ @- HAL_TIM_Base_Init(&TIM2_Handler);2 ?8 k1 i6 M. ?9 \. `
- HAL_TIM_Base_Start(&TIM2_Handler);
# N. E6 n4 m' W8 Z& M0 N - }4 F/ B6 J% u$ H0 q+ Y4 v5 p
- 5 D- [" S$ M& s, e! O6 @/ T2 P' g; x0 P, ^
- void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)% ?( ]6 y( z- ~8 @8 P8 z5 [
- {, R- Z+ ]# p. D6 l
- __HAL_RCC_TIM2_CLK_ENABLE(); //使能TIM3时钟
! G c6 [% O+ g6 ]7 Y - }
) L* W& ?7 B/ X9 g4 U4 y
o% P: Q& V7 S- P @. S
复制代码
& q a% M9 V# d主函数中每秒打印一次定时器的值:* C8 r" K4 c0 z* |
- while (1)
- }6 j6 d: K$ l2 n; L3 \ - {* m6 Z4 W8 l ^7 z/ G( e: u
- printf("cnt:%d\r\n",TIM2->CNT);% ?) }' `0 c& m6 H
- delay_ms(1000);
4 ?: {2 e- ?; {, d* m: z - }
4 ]! w4 C5 n7 B) {
复制代码 显示效果如下:
# L8 E1 U8 l# R+ Q8 ?. w3 \4 Y8 V/ T: D# s4 N/ U
2 C) O3 z3 _3 L4 }# c
8 Y6 w8 X# l; N定时器中断
6 R- s! L7 B! j' y5 j通过HAL_TIM_Base_Start可以开启基本计时功能,但要实现定时器中断功能,就需要开启相应的标志位,即使用HAL_TIM_Base_Start_IT进行定时的开启;
* x2 `: j# p/ W. s- P4 F在配置定时器之前,除了要开启时钟,还需要先设置中断优先级,和使能中断向量;* }) u# j, h) h1 a/ {
在定时器中断TIM2_IRQHandler服务函数中调用HAL库提供的定时器中断处理函数HAL_TIM_IRQHandler,解析到的定时器超时中断会自动跳转到HAL_TIM_PeriodElapsedCallback;
+ }/ \( g( F' f- TIM_HandleTypeDef TIM2_Handler;2 y, V9 m7 V$ E( n3 w
- static void MX_TIM2_Init(void)! s# b1 y7 H c2 X7 g: J
- {
K+ U0 h; j& Q: {% [' g* m - TIM2_Handler.Instance = TIM2;! J7 V; }3 R; e
- TIM2_Handler.Init.Prescaler = 10800;
. s, ^% ?8 _6 w. }4 R9 [* ?9 i# _. ] - TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;+ d a) C. ~+ U% d' V& b# m
- TIM2_Handler.Init.Period = 20000;; N* Z; h4 K/ `7 d$ \& }4 D' ^9 D
- TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;* K2 v) W1 m/ @7 ]( p) V- t
' g6 `' m- Q& K4 n4 @9 _- HAL_TIM_Base_Init(&TIM2_Handler);% d! D7 \$ J, u8 o1 V; p o/ Q9 W
- //HAL_TIM_Base_Start(&TIM2_Handler);! S; A+ O+ a- M. V: l
- HAL_TIM_Base_Start_IT(&TIM2_Handler);
1 }; R) ?: O1 R7 V9 t9 _ - }
9 X: ]# N) K4 H# s' f5 ` - 6 t( n* W R+ |
- void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)/ r) _: ?0 S4 h l. a+ X
- {6 U7 _. M3 O' |4 Z: Z5 ?
- __HAL_RCC_TIM2_CLK_ENABLE(); //使能TIM2时钟% b2 m# c4 `; ^5 `: f' f* K! _
- HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3); //设置中断优先级,抢占优先级1,子优先级3! s% D/ l! V1 }. ]) P3 Z. w
- HAL_NVIC_EnableIRQ(TIM2_IRQn); //开启ITM2中断
- j2 y1 u' y% |( z& e5 { - }
- t! d G3 s% K8 l0 a: w( f8 l - * ?- u! m" o+ t" n
- void TIM2_IRQHandler(void), X( M. X' d, F1 F* S* a
- { F& c9 N/ T0 ^% W
- HAL_TIM_IRQHandler(&TIM2_Handler);
% T0 B( f" v) `3 q4 u - }+ I& x- O5 U/ F+ |0 V
; L+ Y3 ]6 \8 f: X
$ A8 _: J/ c# G5 Y& g. C# k- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)2 f. y B: D, W
- {, a) B5 T1 S1 `5 p
- if (htim == (&TIM2_Handler))
: ?6 [- t$ j) `! R& `- _5 B1 I - {
$ e% o7 L; Z/ s# S& D2 u - printf("enter irq\r\n");1 y( H6 ~9 E1 `, X& ?' r4 H# r% u
- }9 Q: {5 [& H: }/ d
- }" x( P3 A9 M8 d2 v" Q. z8 G; ]
1 I/ P* e G( A- `+ R+ L8 r
复制代码
0 K" J) ~9 g( A8 ~, r2 R显示效果如下:
. L$ W: J0 k- Z' t3 _+ F) f
9 V, G _# W. S5 a' M7 p3 j
6 w. E: ]& w8 d( u
% y/ g8 l/ c" u0 APWM输出) Q ^- _6 x6 {0 a" J- Q
硬件PWM输出是不需要使用定时器中断的,但同样需要基本的定时参数配置,初始化也不再是使用HAL_TIM_Base_Init而是使用HAL_TIM_PWM_Init进行初始化了;
5 k9 m* Y; x& E6 |7 Z$ ?5 y配置完定时器为PWM模式,那么相应的输出通道也需要通过HAL_TIM_PWM_ConfigChannel进行配置;
# w; `) L3 z1 u+ P* a同样的启动也不是HAL_TIM_Base_Start或者HAL_TIM_Base_Start_IT了,而是HAL_TIM_PWM_Start了;7 } M9 u. g+ o" A0 Y
- TIM_HandleTypeDef TIM2_Handler;
" N: W$ p! ]' E% E2 S- r - TIM_OC_InitTypeDef TIM2_CH2Handler;
/ i5 G) @3 ^! g }1 S0 t) @ - static void MX_TIM2_Init(void)
2 o) Z/ T. d* E' T - {) u" R+ c, i! T: K9 u9 N: \
- TIM2_Handler.Instance = TIM2;' y. q- P, u* M9 T6 Y* t2 s
- TIM2_Handler.Init.Prescaler = 10800;2 b$ A. r7 i2 H7 @4 l- ]0 z, F( s
- TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;
& S) T! d' I" F6 d - TIM2_Handler.Init.Period = 20000;
; f/ E6 W0 g" q- O! ~ - TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;9 O! V, E4 }: o G( t- X9 R
- HAL_TIM_PWM_Init(&TIM2_Handler);
3 ?; J% b2 A8 k: p) i, w - ' J( [4 ?4 Z R& E# Z% B
- TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;
4 n0 G1 @2 w; o8 O9 l7 { - TIM2_CH2Handler.Pulse = 10000;
1 W( w2 o* K4 r4 I - TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;
/ J1 K. ~+ X2 {: e& v. [8 d- y - TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;" B# F9 Y( A \: v
- HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;
- q! A- t9 `1 ~- F$ z - + @: G8 G# `7 ?2 p6 u
- HAL_TIM_PWM_Start(&TIM2_Handler, TIM_CHANNEL_2); //开启PWM通道27 o- }0 E! F; ?, s/ g9 E9 B) j( p& J
- }& E4 Y1 h2 O. g3 n
I1 q1 F" c% N6 L2 N" f- void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
3 f( Q) u3 z2 k - {
; l* s+ w# d- H - GPIO_InitTypeDef GPIO_InitStruct = {0};
2 z) z# j; o+ [2 _6 ]6 P -
0 P6 `% K/ o( |/ r7 O% Z& \$ S - __HAL_RCC_TIM2_CLK_ENABLE();
" Y1 M8 R3 u7 x% a - __HAL_RCC_GPIOA_CLK_ENABLE();
, @) k, @' I( ]' ]3 j - GPIO_InitStruct.Pin = GPIO_PIN_1;, H; |+ x+ X% F! y8 y% j& S
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
' n( w0 u7 J9 z4 O8 D: S$ H - GPIO_InitStruct.Pull = GPIO_NOPULL;: L) b. S" T: E/ x! B
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
/ z( I7 f- |. U- ] - GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;4 U. a) k1 T* ]2 s l" r
- HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);# D5 j$ E- z( V1 A+ E B
- }1 w8 }; p5 \2 L' o$ V
复制代码 8 e% U1 o8 j1 H
通过万用表可以发现PA1口的电压在0和3.3V中大概每秒变动一次(疫情期间在家学习,没有示波器真是太惨了……为了确定确实有PWM波形,只能出此下策了T_T),串口打印数据如下:
' X7 X- U0 _* Y5 r1 z+ m8 e9 L6 k' [. i0 D2 u; v* b$ H
' z' z$ e% q/ |6 D1 r8 y) ~% k6 k( y& }9 A9 H
PWM + 定时器溢出中断3 ]6 b/ [, ]0 Z+ O
我们都知道,PWM模式是在比较值处翻转,在溢出的时候再次翻转,而溢出的时候,我们也是可以产生中断的;所以同一个定时器,在这种定时时长和周期相同的时候,是可以即做硬件PWM输出,又做溢出中断的。
6 n$ v% J. C6 T8 L, B这里我们观察一下两种初始化函数:2 |2 C. F1 i3 Z
- /**# T% M( `. @7 s# |
- * @brief Initializes the TIM Time base Unit according to the specified
: Q1 y! x E8 t& U4 Y - * parameters in the TIM_HandleTypeDef and create the associated handle.
5 Z3 y" o7 i# Q$ ]# v4 h - * @param htim: pointer to a TIM_HandleTypeDef structure that contains) S; [3 `' ?4 r3 \7 _
- * the configuration information for TIM module.
9 u( w/ V; {$ @( Y8 {/ W2 I - * @retval HAL status
0 w) _0 n+ }$ b2 P - */! X+ C7 Z5 ?# F) B3 k6 ~
- HAL_StatusTypeDef HAL_TIM_Base_Init(TIM_HandleTypeDef *htim)- v+ G5 Y- T& y: j+ [* o
- {
Y) Z; A0 s m - /* Check the TIM handle allocation */
2 Z4 {/ ^0 L; Y6 a8 A5 o. N - if(htim == NULL)0 U1 @- z: q/ v$ [& i8 w7 j; m& N
- {
# K6 O! Y e% @ - return HAL_ERROR;4 D! h: I3 R. ~% e) X
- }
u6 o4 t* t! K6 B3 F - 4 z7 Q5 E* z! S) I9 N$ u3 ?3 ~
- /* Check the parameters */4 M0 _" X5 q) l4 Y( N; R! i/ k
- assert_param(IS_TIM_INSTANCE(htim->Instance));
l6 `& `" s1 Q3 S: O# I5 q4 X - assert_param(IS_TIM_COUNTER_MODE(htim->Init.CounterMode));, J0 E X; Y9 Q6 j7 j: K
- assert_param(IS_TIM_CLOCKDIVISION_DIV(htim->Init.ClockDivision));
5 s/ j% C6 F1 ]5 d8 x8 ]* a -
C1 U+ V& @9 ?' G1 a - if(htim->State == HAL_TIM_STATE_RESET)4 ?. \2 S4 ~, j% @8 ~
- {
- ]1 f" `: e) [ - /* Init the low level hardware : GPIO, CLOCK, NVIC */. u! a7 m- Q I: j
- HAL_TIM_Base_MspInit(htim);
: T1 }4 Y. f ?# i3 k }' B- q8 P - }+ D4 q9 ?+ G# x2 _2 e
- 7 v" @) P [, P( _
- /* Set the TIM state */
% X) w8 R! u, T' Y& w - htim->State= HAL_TIM_STATE_BUSY;
% t! r t7 \$ t. R3 c5 J7 x0 S1 r5 }$ Z -
f/ A: W% g# }( d8 _" v - /* Set the Time Base configuration */
% v! p' F7 r4 `* S" P! H+ a - TIM_Base_SetConfig(htim->Instance, &htim->Init);
6 y0 Q! N+ N) R& W6 y1 U0 L -
* o5 x/ X( N( }% r% W: k0 H/ {7 e! {# \ - /* Initialize the TIM state*/
8 d' _% ]% ]9 \- O - htim->State= HAL_TIM_STATE_READY;, J; U3 ]3 w/ q; u3 K2 F" I# y
-
/ x `# a, P+ c) `, z9 A - return HAL_OK;. e2 J; y7 S R9 Y6 K8 } Y
- }- q" Z" t% z8 Q% ?/ J
- ! Y' ?" h+ K( k2 V d
- D) c) n, ^! S" p2 E
- HAL_StatusTypeDef HAL_TIM_PWM_Init(TIM_HandleTypeDef *htim)$ k4 ^- a' A, R
- {! d4 V2 c; o( O o# `' e9 b, w' n p2 Q
- /* Check the TIM handle allocation */: `" n: ^1 b- B+ t
- if(htim == NULL)
) u& _+ e+ t2 c& B! e - {0 s( a- E: S4 @4 }$ ^
- return HAL_ERROR;
: }- H( {' t; N# D! f - }0 \) c5 v5 R5 S. T: m3 n
- 6 I8 R, f9 S! a! v4 r! t$ K
- /* Check the parameters */
( I! w2 ~1 s* x$ ` - assert_param(IS_TIM_INSTANCE(htim->Instance));5 ~5 _& G. W9 j8 l6 n! G
- assert_param(IS_TIM_COUNTER_MODE(htim->Init.CounterMode));
: |/ L5 x6 Z- A6 n: E - assert_param(IS_TIM_CLOCKDIVISION_DIV(htim->Init.ClockDivision));
" g8 K8 U) `+ t2 I" T% k' z - 4 K* y( v- r0 z* H5 D3 v8 M
- if(htim->State == HAL_TIM_STATE_RESET)
6 A; \' {' l% F- V - {
: l, ?# l6 \# F R) ~ - /* Allocate lock resource and initialize it */1 l$ ]& w& V3 c( K# L
- htim->Lock = HAL_UNLOCKED;
. i+ d: F& A6 _9 ?* W' f - /* Init the low level hardware : GPIO, CLOCK, NVIC and DMA */6 z9 M2 t4 u' E" b: Z' W" g i
- HAL_TIM_PWM_MspInit(htim);
3 G- z9 `) g+ j1 G - }
1 I, w3 I2 f" x/ w$ j0 _" h
# y0 ?+ W/ l7 S) l8 Z, u! [4 v- /* Set the TIM state */4 C" M* ?8 d* M2 ]9 N! [ N
- htim->State= HAL_TIM_STATE_BUSY; & U+ J( d. S% L5 R+ t0 L, J9 _
-
% F- K0 \1 L% z# @- y4 Y - /* Init the base time for the PWM */ ! g7 k9 x4 J) E( Y6 g
- TIM_Base_SetConfig(htim->Instance, &htim->Init);
% y* X/ r% n+ K* T3 S - ) @4 X7 D" C9 T) p) h
- /* Initialize the TIM state*/
# M; I& A, N. ^/ m) H$ j; d& J* | - htim->State= HAL_TIM_STATE_READY;0 t6 c$ [6 h, ?; J
-
9 T- f* w- D" A0 z! f - return HAL_OK;& h# n% z* N' J; H) l+ [0 i
- }
9 x& t9 g* _! g7 S
复制代码
6 L5 _, U) f# _$ d/ D" S两者除了底层的HAL_TIM_Base_MspInit和HAL_TIM_PWM_MspInit,其他地方一模一样,所以我们随便调用一个初始化就可以了,但是要注意,我们在HAL_TIM_Base_MspInit里配置了NVIC,在HAL_TIM_PWM_MspInit里配置了GPIO,所以只调用一个的话,必须手动把底层的粘贴到另一个函数里去,如果是想两个都调用一次,这里就需要考虑htim->State这个变量了,因为在调用了一次之后,其值就从HAL_TIM_STATE_RESET变成了HAL_TIM_STATE_READY,后面的一个就得不到执行了。
- f4 l; i' T/ K' q: U再来看启动代码:
- \0 A. C& T" K) K/ k- /**
7 c; p. y J* _! J; } - * @brief Starts the TIM Base generation.3 a' O* k! `$ i; M" j4 z5 f! @' y
- * @param htim: pointer to a TIM_HandleTypeDef structure that contains
0 n& T0 ~5 z) ^8 L5 Y" e - * the configuration information for TIM module.6 I+ ^8 m+ j; T6 g$ }7 y
- * @retval HAL status
3 e* I3 y. {% ], K& _. {* J9 v9 J - */
& B3 E5 l+ N; n) \- { - HAL_StatusTypeDef HAL_TIM_Base_Start(TIM_HandleTypeDef *htim)* L$ p) v2 t( C8 y4 d% @$ [" A S, y
- {% R7 n u) G! `
- /* Check the parameters */' a" u# D6 p7 h+ I: D0 c$ S: W
- assert_param(IS_TIM_INSTANCE(htim->Instance));
$ ^* S x s7 L0 ^! a% k& J - 5 I1 y- w& _# R: h- W
- /* Set the TIM state */! I8 \; d W, J* l5 h( E5 m+ y
- htim->State= HAL_TIM_STATE_BUSY;
4 J( ]2 E3 w0 _/ j - 8 ?1 H1 V% n, ~/ L' ?. i
- /* Enable the Peripheral */
h2 t. ~; p4 X, o3 l; O$ J - __HAL_TIM_ENABLE(htim);
" D' \7 [. [, ^. G0 X' p2 R - 4 Y6 l+ B0 f" ]$ E- \( T
- /* Change the TIM state*/, \; d: W) M. l( z) j) F& b
- htim->State= HAL_TIM_STATE_READY;
/ }; A5 q: z( D9 c, {% l) Y -
d9 ^5 w, g5 t( O1 l. a. h- g - /* Return function status */1 s3 d3 D! g. }
- return HAL_OK;1 {) C. q+ E5 t) ^: S" U7 U4 ]
- }
7 O, i. K: V; Q: q" J4 F J - + i8 w; b6 O% s, W& B$ }
- 3 Y: z$ Q# N2 ?4 q
- /**
, u) Z1 t; F! R - * @brief Starts the TIM Base generation in interrupt mode.. j# ]- {+ D) P
- * @param htim: pointer to a TIM_HandleTypeDef structure that contains8 h6 K/ A; [9 C( l1 p
- * the configuration information for TIM module.
2 W/ B7 n1 x- T' v! ]8 s - * @retval HAL status
' b$ j% Z) L, A6 ^ R - */
5 u7 y3 l+ J( f9 U0 t* W - HAL_StatusTypeDef HAL_TIM_Base_Start_IT(TIM_HandleTypeDef *htim)
4 o; z& q+ e+ \: t' O - {
' s" r1 M+ S0 X# N, q" P - /* Check the parameters */' Q2 Y7 l$ G$ E' v2 N7 @5 c
- assert_param(IS_TIM_INSTANCE(htim->Instance));
+ D6 b4 X6 x* G! h/ Q -
5 e$ t/ W% X9 U0 ? - /* Enable the TIM Update interrupt */
7 E0 I; V" E0 Q$ c - __HAL_TIM_ENABLE_IT(htim, TIM_IT_UPDATE);
" y+ j3 c) X0 H4 D: F -
) N% L: k+ m/ D5 y4 L/ L" _0 s" x - /* Enable the Peripheral */* f1 ?* `* l' |+ `5 N' g. r
- __HAL_TIM_ENABLE(htim);
- G% i% ~5 A5 s/ a2 a) ]5 I9 S0 C5 R8 ] -
0 h3 }; [ _# G; v" J5 D5 A - /* Return function status */
6 o9 ^/ J2 v- Z" E$ _ O# a - return HAL_OK;3 q5 K0 j V, @) E+ N: B
- }7 i) |, e1 T2 S+ O* i" d; p4 ^
# G; Q0 }0 f# n" i5 y- ! E8 R6 N9 p6 n" p9 M! ^" J
- /**
1 ?/ Z8 I8 p2 N/ X - * @brief Starts the PWM signal generation.
" i6 ?3 l# }' J0 N8 e) F, K - * @param htim: pointer to a TIM_HandleTypeDef structure that contains
% q! o v: j4 R( A5 q' y! O - * the configuration information for TIM module.6 |; u" e, h1 W
- * @param Channel: TIM Channels to be enabled.9 r7 f1 B4 ~* q% o. c
- * This parameter can be one of the following values:3 }: Q! A3 @: n0 l2 _+ n
- * @arg TIM_CHANNEL_1: TIM Channel 1 selected& e, D8 N+ q' ?+ G6 E5 o4 P
- * @arg TIM_CHANNEL_2: TIM Channel 2 selected
- A2 U6 b# h6 y' G - * @arg TIM_CHANNEL_3: TIM Channel 3 selected
4 G( R t* ?6 f5 d) Z* ?: \ - * @arg TIM_CHANNEL_4: TIM Channel 4 selected& Q9 v U: P, W& |4 I: |
- * @retval HAL status
$ X3 [. H/ N8 b- z! r9 } - */1 K' Z0 v+ e; V. s* V5 I8 i1 ?: k
- HAL_StatusTypeDef HAL_TIM_PWM_Start(TIM_HandleTypeDef *htim, uint32_t Channel)
, l6 e+ Z4 T7 z! R$ t- b L - {
1 |+ R) k6 X% U* J# F% g - /* Check the parameters */
- P( M& v# y: n+ Q( n m - assert_param(IS_TIM_CCX_INSTANCE(htim->Instance, Channel));# Y2 O$ W# Z' S, _
- . o2 t6 o: s9 |+ ~2 G+ O# F0 _2 z' Z
- /* Enable the Capture compare channel */
& C, T( N/ [3 u2 ~+ _' i - TIM_CCxChannelCmd(htim->Instance, Channel, TIM_CCx_ENABLE);6 n- V* N4 @) T! Y2 C+ V: t
- - \ I( O7 M! P1 w1 M/ ^9 X
- if(IS_TIM_ADVANCED_INSTANCE(htim->Instance) != RESET)
% M+ w$ N' f4 U5 i1 S7 o$ s" ~ - {
' p* Z- J9 n* o5 }: p - /* Enable the main output */* f* D8 V0 ~" u @. Z& f% I( H! w
- __HAL_TIM_MOE_ENABLE(htim);
4 Y0 y, s% M, h; i0 @' { - }
' H; K2 J' w( K t6 I* b* O, e -
' [5 Y$ E. T* M" \! L - /* Enable the Peripheral */$ W9 O. i9 f2 V( k# d6 g2 m2 _. f
- __HAL_TIM_ENABLE(htim);
& t9 j$ i# Z1 b& l -
5 x$ m7 G- I6 X: w9 l# O+ m - /* Return function status */
' a g9 o2 X7 Y0 G: U+ h - return HAL_OK;
) y/ H* n1 l- i- v6 t, L - }
. }+ q1 r' }1 V; f$ _
复制代码
6 c9 N, m. z& a3 b$ k. E, l其中的核心代码分别是:- t( @- h3 H' ^
- __HAL_TIM_ENABLE(htim);
$ J w% O$ [+ v- D8 T3 b4 v
复制代码- __HAL_TIM_ENABLE_IT(htim, TIM_IT_UPDATE);
7 N7 w- e0 Z" X: G* a2 ^1 l6 M - __HAL_TIM_ENABLE(htim);! K) [) D3 P$ L3 D; L/ W/ c
复制代码- TIM_CCxChannelCmd(htim->Instance, Channel, TIM_CCx_ENABLE);
+ {5 b, t% a' F5 r0 s - __HAL_TIM_ENABLE(htim);6 T5 o6 d* ^* \) X7 t8 Q8 b
复制代码 8 L e/ o$ A& B* n9 V! }5 g3 @
那么我们可以不用hal库提供给我们的启动函数,直接写三句话,就实现了定时器中断+PWM功能了。1 D4 z3 I. }4 m5 {8 w
- __HAL_TIM_ENABLE_IT(htim, TIM_IT_UPDATE);
5 Z; Y' z6 S* M - TIM_CCxChannelCmd(htim->Instance, Channel, TIM_CCx_ENABLE);
/ `3 }( c% B y8 W3 v' O0 r7 A5 U. G - __HAL_TIM_ENABLE(htim);
+ j D' z5 f: L; K- ?
复制代码
7 \, U4 {( I( U/ K8 y$ L完整代码如下:
& M; k4 Z( _. U8 X% r$ ^ `- TIM_HandleTypeDef TIM2_Handler;! o0 H$ F. R; t
- TIM_OC_InitTypeDef TIM2_CH2Handler;: y; q0 j- }. x; M0 J
- # l" B( t; O# a
$ @9 A- S2 _+ C q/ J: o7 |- static void MX_TIM2_Init(void)& y( m- T+ Z# ` i _6 b: d
- {9 ^; S- E8 Q6 l. f' p0 J. _0 g. }" u
- __HAL_RCC_TIM2_CLK_ENABLE();
% t. w% _6 I2 s% e C3 X - HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3);
$ G# Y- d- F) N' K& r - HAL_NVIC_EnableIRQ(TIM2_IRQn); g R& {! b. G* q! N" O( z
- " W' t- d1 X0 F( I2 _$ ?
- TIM2_Handler.Instance = TIM2;6 y; ]. l' U4 D+ ?& X
- TIM2_Handler.Init.Prescaler = 10800;+ c% q" O4 | m5 B
- TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;
# w* j! B- m+ N* M% | - TIM2_Handler.Init.Period = 20000;+ X" ^; i. z1 s% s5 {/ B! ~
- TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;3 F2 A8 t( \ {' A {
- % C5 `5 K3 D$ N# c
- HAL_TIM_PWM_Init(&TIM2_Handler);
2 j" T: D9 [# h - ( _* A, _& I m% U' V% a7 Y U X
- TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;) }% y! V9 ~. f4 c h/ G$ C7 @
- TIM2_CH2Handler.Pulse = 10000;! }( D0 `- W9 I; S
- TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;
& k* [2 \7 t0 f2 A - TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;6 C! ~3 Y+ ~& L' D
- HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;$ z! n2 ?5 P; F o" B
7 d$ {( t/ \& T C7 U! i- __HAL_TIM_ENABLE_IT(&TIM2_Handler, TIM_IT_UPDATE);' R- S# a5 m( p' [
- TIM_CCxChannelCmd(TIM2_Handler.Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);
7 Y$ S% c: B9 A2 I - __HAL_TIM_ENABLE(&TIM2_Handler);
$ M/ q& y& u4 L! O. E1 I - }7 {" Q' o, H5 U8 \3 s4 F
- - U% {' G+ w6 E: C P) R! m
- 3 T8 h" v( W" q, p9 Z0 J
- void TIM2_IRQHandler(void)! B4 i1 \$ z! ?$ s* X
- {
7 d- N* ?% M2 A5 z3 r- ]& O" ` - HAL_TIM_IRQHandler(&TIM2_Handler);
0 N3 v# b( b. U% u - }
6 Y( C m. E+ c; J - + r; h! {) C3 x% J
0 S& ?- q H- C% }/ q6 J- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
* e) j" f" y8 b$ @, d# G& Y - {
# v# ?3 _8 [0 T8 |7 t' {* G ?( f - if (htim == (&TIM2_Handler))1 u2 B7 r' H L @% ?3 k2 q, }
- {- X( }% n& G, d5 A
- printf("enter irq\r\n");6 O1 G1 }1 ^: G6 X
- }
w: ^3 C& s) X3 ^, _2 d0 u( h8 C* i, X - }
4 |0 Y w' i4 M3 |, G) s4 v( v
, S% v/ u* f: [, j5 f- / z* c" u& V8 K4 H6 Y3 o
- void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)- r5 U# x. [! {- S0 W* w" K J
- {
- A! A" @- d$ q* q7 l2 [ - GPIO_InitTypeDef GPIO_InitStruct = {0};2 _/ l( Q) O1 m, q% U+ R! k Z H* C
2 u* t* i# S% K2 Z# J/ \- __HAL_RCC_TIM2_CLK_ENABLE();% a5 d& _4 {: I3 g* x( ~1 c' x
- __HAL_RCC_GPIOA_CLK_ENABLE();
, o, L1 S: D5 e8 b; k3 Q& ~5 I - GPIO_InitStruct.Pin = GPIO_PIN_1;- |- q, K3 u$ l U2 x
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
0 w/ L" Q" R3 c, o. y0 o - GPIO_InitStruct.Pull = GPIO_NOPULL;
$ H! C' g- L _; p; `) G - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
$ S1 i1 r- f8 k( s, \6 o3 ^% [! h - GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
2 d$ M2 ?5 h5 x) J& B" S. _ - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
_) R! U0 c( J* `3 [$ X$ d+ L - }
复制代码 ————————————————
) V. D) ~ B& o! W# P9 _版权声明:小盼你最萌哒
& C! j1 z( g0 O: D( P# d o% y( ^, f4 O" \) M* r
' r9 p6 `2 \, J |