基本计时功能* h, A9 O7 J4 I$ N9 p4 z4 t% ?# r
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。+ X+ G, p' n X
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。' O) ]4 X& Q% Z
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。! p9 g7 ^0 L& r) s# i
- TIM_HandleTypeDef TIM2_Handler;
' J2 [3 N5 B+ L* }& v0 P( ~/ I" Q - static void MX_TIM2_Init(void)
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- TIM2_Handler.Instance = TIM2;
2 N. m+ v3 _2 y/ ^+ g - TIM2_Handler.Init.Prescaler = 10800;
1 `3 A0 C7 J# H3 b: j9 o - TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;1 `( ?3 x1 B! C) p
- TIM2_Handler.Init.Period = 20000;
6 h$ e |- }7 Z - TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;2 v% U, x. V; b: `
- / R5 J% n6 g Z
- HAL_TIM_Base_Init(&TIM2_Handler);- t$ U5 N! n# A8 `6 A( ?# N
- HAL_TIM_Base_Start(&TIM2_Handler);
$ S' a) |9 n% p9 y! O! K, h - }
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" g! s2 p& I5 g7 a% a- void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
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- __HAL_RCC_TIM2_CLK_ENABLE(); //使能TIM3时钟
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复制代码 * J7 y6 G. L4 Z' f, [4 _; Q
主函数中每秒打印一次定时器的值:
' g F2 L, Y% U* }- while (1)4 c4 Q" r6 _6 m# a
- {( q& k5 C4 h: Z$ Q! ]6 K$ t7 B* d5 V2 X
- printf("cnt:%d\r\n",TIM2->CNT);
* `( ^" E5 X- d$ T! x% t# f - delay_ms(1000);
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复制代码 显示效果如下:8 Q3 y5 J/ R8 G, W2 [
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定时器中断8 p( R7 F5 k& I5 d
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;
" q ^4 Q; `0 V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;
! ?2 Y: u& c3 O5 | _" w8 }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;' Z* |/ A- J& x. G4 I N, D
- TIM_HandleTypeDef TIM2_Handler;* P( ]. [( c8 E. b. j$ m
- static void MX_TIM2_Init(void)
6 I |5 q8 Y6 n7 x7 E8 C - {
, B, w+ H5 E& J. ]" ~9 Q0 }4 Q - TIM2_Handler.Instance = TIM2;
! _, h/ q; w- u' C - TIM2_Handler.Init.Prescaler = 10800;7 e) s* t2 h \ ^: p
- TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;# I3 ?% e- i6 i& } I3 K( ~
- TIM2_Handler.Init.Period = 20000;
- i# D: y* }5 q; n - TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;7 d% K1 y9 C- ^$ z$ E: o! b1 X) B
: J$ ^1 I% K% ?; H* n+ a- HAL_TIM_Base_Init(&TIM2_Handler);
: h v' A B& N" k1 E+ y. i - //HAL_TIM_Base_Start(&TIM2_Handler);
* N3 X H9 A, S - HAL_TIM_Base_Start_IT(&TIM2_Handler);, O, a. R- x' b/ [) j- ~# B$ O
- }
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3 l$ x" W; h& z- I- void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
, q" P" N! @( W1 k: a! [ - {
3 Y2 e; k# {7 e8 x0 E2 P# C+ j5 a) R - __HAL_RCC_TIM2_CLK_ENABLE(); //使能TIM2时钟
% Z+ A; h) O, E l& K3 m; l - 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( o e% @: Y4 A& K% h
- HAL_NVIC_EnableIRQ(TIM2_IRQn); //开启ITM2中断( I5 k) e+ q- ~
- }% A/ D- j, ?* Y! q( Y
1 m1 S& @$ y+ K! C7 `! w0 ^8 ]- void TIM2_IRQHandler(void)
* j9 q7 ?! W# }7 H S - {# W* J0 s8 \" O9 d; z! [( a4 k
- HAL_TIM_IRQHandler(&TIM2_Handler);
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- 2 f) x0 g5 A/ b' r( k9 _
- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)1 [$ A4 b, v: q2 J) g1 A
- {
. Z# D% a0 L0 M7 j r6 D - if (htim == (&TIM2_Handler))# r6 B, g( r) g5 L- D1 ~7 t
- {, |8 I: T5 i3 g- P$ G# R
- printf("enter irq\r\n");
- q/ g$ y; A- P/ { - }
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+ N" d4 J P# R8 x1 @2 r
复制代码 ' Q6 E4 g; K% a9 f# X. P; I
显示效果如下:: A3 K0 ]% X/ F+ z
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PWM输出
! H d0 O/ @4 d0 e- N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;
: a0 g% X+ C- z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;4 ^+ _/ Z# X! ?3 O! n% s
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;
+ Z+ O7 b8 K+ q8 P- TIM_HandleTypeDef TIM2_Handler;( S0 G3 @5 L) M, }; b$ d+ X
- TIM_OC_InitTypeDef TIM2_CH2Handler;
* Y5 O6 q: }7 J$ d- Q1 p; d! ~ - static void MX_TIM2_Init(void)
4 p; L' a8 [2 F8 B5 }2 _4 R - {
/ J- n1 }; G& _% x$ O" J0 m - TIM2_Handler.Instance = TIM2;
% [2 T* L' L$ @8 f0 }' O( b - TIM2_Handler.Init.Prescaler = 10800;5 a) U- J4 f" _) T
- TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;
2 b q9 ?; m: g, B6 @! k - TIM2_Handler.Init.Period = 20000;
$ o& j( c# X+ e4 E8 F. [ k7 ]* B - TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
* N5 W. E) O% e$ B/ B+ a! [ - HAL_TIM_PWM_Init(&TIM2_Handler);" l, V: s& ~- n
0 U# z2 P* K& V& I4 J- U6 B9 |- TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;
6 n( [0 k$ |$ z* K; b# ~, i% W - TIM2_CH2Handler.Pulse = 10000;
! t, J! N; l% l+ t8 u R6 g - TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;: S, N: v% v7 L6 D7 g3 j5 ]
- TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;) c4 ^/ O d) L* r
- HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;0 Q( h: |& B% D% K+ x; ^
! \/ f+ q/ A6 @- HAL_TIM_PWM_Start(&TIM2_Handler, TIM_CHANNEL_2); //开启PWM通道2
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- void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
- a, T# B5 ]7 T8 c* ]$ H* G/ { K- N - {
# R. V" [2 ?% s/ Z6 Z2 z) U L* Y - GPIO_InitTypeDef GPIO_InitStruct = {0}; L0 a6 E* M. j
-
% X6 g1 i7 f! r - __HAL_RCC_TIM2_CLK_ENABLE();
+ j; y3 A# U5 [2 L - __HAL_RCC_GPIOA_CLK_ENABLE();2 E) L! p- e' r0 @8 V
- GPIO_InitStruct.Pin = GPIO_PIN_1;
5 b( u$ ?8 R; K - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;. b- ~$ x6 G2 c* O( E0 m
- GPIO_InitStruct.Pull = GPIO_NOPULL;: i' u7 }" V- P5 I% _
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;5 S% ]& [: n8 Q7 W) L5 s( _ R
- GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
8 h; ]2 _4 }# p* Z u, m, I - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
4 X1 m3 x: i6 } - }
* B1 X7 [; l2 v
复制代码 8 n. ^( F) r3 k, n
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:) h# f7 W+ G" P8 _9 N/ M& J% N
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PWM + 定时器溢出中断
I7 V1 q" b# ~# z/ K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。
1 ~5 A0 `$ A! I W0 X这里我们观察一下两种初始化函数:9 g) k( n$ h$ v- ]# O
- /**
' P. ]4 n- x( ^2 ]) ^& w1 ?1 h - * @brief Initializes the TIM Time base Unit according to the specified- F) J; y# D: y. O
- * parameters in the TIM_HandleTypeDef and create the associated handle.' U0 k( M5 r4 H# O6 H* X
- * @param htim: pointer to a TIM_HandleTypeDef structure that contains
& q# {- ?3 [' f9 \4 y$ m - * the configuration information for TIM module.
4 J! \, W% ?8 Y - * @retval HAL status
7 U" T" j# y4 X - */: P' a( M% W7 m" B& m
- HAL_StatusTypeDef HAL_TIM_Base_Init(TIM_HandleTypeDef *htim)
7 a; @1 `1 Y; P2 e& w - {
: v& O4 t A' a+ G' K - /* Check the TIM handle allocation */
p1 }* h: E# U - if(htim == NULL)
( Q8 \5 f0 { _ - {
% W8 C m/ I, O5 i$ j5 S2 _5 A - return HAL_ERROR;
$ J3 m' ?+ a; \2 o, o - }
/ S* O& _# n2 P -
; C: T6 E1 |, H: w* D g2 m7 Z. Q - /* Check the parameters */, X) e: D. a6 z9 R# l0 k0 ~
- assert_param(IS_TIM_INSTANCE(htim->Instance)); % S- V9 I/ u# k( L# H0 N
- assert_param(IS_TIM_COUNTER_MODE(htim->Init.CounterMode));+ ?2 L+ R- E! @' o
- assert_param(IS_TIM_CLOCKDIVISION_DIV(htim->Init.ClockDivision));
) x. N: {% N3 j; a$ ] -
! w: ]' q! ^5 @& C) X4 z - if(htim->State == HAL_TIM_STATE_RESET)
' D7 j: K1 \0 w4 o+ }3 S$ }6 s - { 3 C1 _+ Q& b7 ^/ m6 m$ o3 F! r& Q2 ?8 S
- /* Init the low level hardware : GPIO, CLOCK, NVIC *// S' L8 N z( m( x1 t# N
- HAL_TIM_Base_MspInit(htim);
* B! q' b/ b& N0 q- M w - }
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- /* Set the TIM state */. P! t; v2 X8 t" ^+ K; Q P
- htim->State= HAL_TIM_STATE_BUSY;
3 a' J/ S/ h+ e5 p9 C" @$ u" i -
) u* C- d K+ P- Z9 Z - /* Set the Time Base configuration */; {6 D! d$ m8 k+ U
- TIM_Base_SetConfig(htim->Instance, &htim->Init); 3 [( U6 M8 u% l3 Q) e' [% S/ ?
-
! H- \- p" p1 V& `, C- G% o4 F - /* Initialize the TIM state*/7 P$ u- o% v5 C( y3 g9 _
- htim->State= HAL_TIM_STATE_READY;
" H- j4 B. b: ]/ ]4 _1 m4 a9 o -
5 _. U! G: F7 A+ `1 U* _& A3 S' y - return HAL_OK;! s) `8 \( o% ~' q5 e# l
- }
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6 ]9 B- b& i2 z7 s- 9 c) C+ ~7 j* N
- HAL_StatusTypeDef HAL_TIM_PWM_Init(TIM_HandleTypeDef *htim)8 v+ y1 g' z& V
- {$ J9 Q; `1 s1 t L
- /* Check the TIM handle allocation */0 G; a% ^" \. Q; L
- if(htim == NULL)9 A0 o, e) k! i% ^, x. P `/ c. \
- {
9 B- S6 U2 _7 ?; h; M" m - return HAL_ERROR;" @4 ]3 R" w; ^; X* i: x1 t0 G
- }3 |2 R/ v! `8 ?% `
9 V$ d- I9 {+ b# ^8 _: r; b- /* Check the parameters */7 W! k! K) _5 v) [ n7 r5 k
- assert_param(IS_TIM_INSTANCE(htim->Instance));+ O6 p, ^6 k% H% A6 a& A$ s
- assert_param(IS_TIM_COUNTER_MODE(htim->Init.CounterMode));% N' w' [9 _- l$ [
- assert_param(IS_TIM_CLOCKDIVISION_DIV(htim->Init.ClockDivision));3 c7 V0 u7 }% E1 J' K! g9 a
* F d# B' Q% g x! F- if(htim->State == HAL_TIM_STATE_RESET)- {* J' e2 M) J1 w. `- Y
- {
6 r1 M$ X' U1 v! I5 G! I8 R, X - /* Allocate lock resource and initialize it */
- R; f3 b- L7 B- U7 S3 c - htim->Lock = HAL_UNLOCKED; ( d; T+ R+ C0 J
- /* Init the low level hardware : GPIO, CLOCK, NVIC and DMA */
1 N& Q( n/ I- P0 ~: U - HAL_TIM_PWM_MspInit(htim);
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( ^6 {/ ^: ?! s8 L* z9 `1 U- /* Set the TIM state */6 K* C- G+ f! g; S3 ^
- htim->State= HAL_TIM_STATE_BUSY;
4 [* ~% E3 l& f/ K -
5 Q+ z! d& _8 D2 I# w - /* Init the base time for the PWM */
6 V7 q( m4 y6 B$ ]# u4 Q1 I - TIM_Base_SetConfig(htim->Instance, &htim->Init);
! @0 G4 `/ d h( l -
" l F$ R+ Q; g- k4 ~ - /* Initialize the TIM state*/
5 S+ P# V) p! k H& Q5 E5 c# T - htim->State= HAL_TIM_STATE_READY;! V4 `" H/ A! P' z; a/ C
- ! S: D- ]& H* b# Z2 T
- return HAL_OK;* |5 k! [+ [& q( H" o3 f
- } 8 X3 O3 a, _* Q. ~6 X
复制代码
- b8 V) [. B7 D+ Y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。/ s% r+ J% u3 ?
再来看启动代码:9 ^* H' h. p& m1 ~8 u, ?
- /**( ~; M; g/ K. ^" k/ g6 y
- * @brief Starts the TIM Base generation.% y& \7 I( q, m
- * @param htim: pointer to a TIM_HandleTypeDef structure that contains
6 b+ v/ J r8 O! C0 C - * the configuration information for TIM module.) s( q6 U! z, m9 T
- * @retval HAL status
) D0 W G! W h9 N - */' |* }! |8 O9 p
- HAL_StatusTypeDef HAL_TIM_Base_Start(TIM_HandleTypeDef *htim)
7 W4 \1 R: w, V/ I2 z( F8 z - {- R% G* X5 c/ ~2 e/ E6 V- G
- /* Check the parameters */
6 f8 }8 J+ F: |9 z& a' G - assert_param(IS_TIM_INSTANCE(htim->Instance));6 K, P# z9 v+ k2 w% ?8 j! x
- ! i/ f, C5 v: l6 n0 F
- /* Set the TIM state */
, a: D3 _* U7 Y* S- N/ Q( a* A - htim->State= HAL_TIM_STATE_BUSY;2 X5 u' S0 Q0 u2 T
-
: R- K% g9 h8 {) j( i - /* Enable the Peripheral */3 |* ~% l& l1 r) M% \1 y
- __HAL_TIM_ENABLE(htim);
2 Z1 A$ v& k3 n" X5 Y5 P2 ` - ) W/ ]3 y4 N: f) F" ?3 I0 \4 _
- /* Change the TIM state*/+ P: H/ C% S2 y4 R e9 l0 y
- htim->State= HAL_TIM_STATE_READY;: }( O( M4 f( {1 f0 u. [* `
-
; E* q* [0 |. t% L! o - /* Return function status */. J" N3 e0 G" E' z0 t$ ~
- return HAL_OK;
3 @8 I6 e9 r% N7 d+ I4 \ - }6 W! m q( E7 R* p x0 U
. j8 e9 W4 B$ p, G- * J1 R/ a' W& _6 O0 `
- /**
$ m1 p7 }8 h' ~, C% O$ G; ^* D - * @brief Starts the TIM Base generation in interrupt mode.' L' m. V! G6 B! k- {
- * @param htim: pointer to a TIM_HandleTypeDef structure that contains6 Y$ K) l0 A7 z
- * the configuration information for TIM module.
8 n( L$ K, S! {: Z5 a2 W - * @retval HAL status+ ~0 J1 l# z8 _) d' y+ z
- */
0 o: ~: e- c9 p' Q6 g - HAL_StatusTypeDef HAL_TIM_Base_Start_IT(TIM_HandleTypeDef *htim)
* I) C) T7 u. D" }! H - {
: g1 n# [5 R1 U3 I0 f. @ - /* Check the parameters */$ L0 w' P( x$ @
- assert_param(IS_TIM_INSTANCE(htim->Instance));
: L; Q) ?% v3 l. e6 s6 } -
& ]* z/ t: ^- J. B& m - /* Enable the TIM Update interrupt */
# o, w" v+ x& P - __HAL_TIM_ENABLE_IT(htim, TIM_IT_UPDATE);- y+ U: b4 c0 a* r: a/ w
- & \2 K* l* d+ M# _0 n' g
- /* Enable the Peripheral */9 t; H" J, h, M, t Y) {! I3 q& r
- __HAL_TIM_ENABLE(htim);8 _# p- Y' L% Y" e0 }1 e
-
2 }9 z/ V( a8 e- K$ D1 t - /* Return function status */8 S9 I3 d# w; w
- return HAL_OK;: g" E+ w: ]+ G5 Y- F+ Z
- }
3 Y/ P7 ^; e1 y: [ I3 y% j4 { m; { - " O% z& Z7 p+ w" @
# w9 e4 h* N0 a9 ^' H: @- /**# f6 }, s$ O6 ]9 o
- * @brief Starts the PWM signal generation.
& ?% l' C$ u/ x& i1 L# J4 H5 a9 K. ^- _ - * @param htim: pointer to a TIM_HandleTypeDef structure that contains
, i N# X7 C- J! R5 |3 l- N - * the configuration information for TIM module.( R1 V# A9 b* I2 t8 [
- * @param Channel: TIM Channels to be enabled.
8 q Q0 S, c0 k" h- {- Q - * This parameter can be one of the following values:
0 M; m; q4 n3 i - * @arg TIM_CHANNEL_1: TIM Channel 1 selected& _" N4 ~8 F" m( \" C7 T! ?4 w' Q
- * @arg TIM_CHANNEL_2: TIM Channel 2 selected
* s- p3 }, u6 u( S7 _" k - * @arg TIM_CHANNEL_3: TIM Channel 3 selected
( d9 p/ N1 N! {; u3 ] - * @arg TIM_CHANNEL_4: TIM Channel 4 selected
, m( L+ l: o8 n1 m% g5 I. f - * @retval HAL status$ I; v% U% k, c
- */
( e/ A7 X- ^1 r# K% K' c/ ? - HAL_StatusTypeDef HAL_TIM_PWM_Start(TIM_HandleTypeDef *htim, uint32_t Channel)
8 _& c* W# }/ L" j+ p5 J% b - {
C9 [4 {! J0 Z8 j; }5 m - /* Check the parameters */
) m4 J, `+ s/ x8 N5 L - assert_param(IS_TIM_CCX_INSTANCE(htim->Instance, Channel));# u; z" m2 d ]( n0 B% n# ~
- 6 E' g4 Z, n$ \5 y+ v& x# h
- /* Enable the Capture compare channel */
8 z: b, d* o2 q5 _# X - TIM_CCxChannelCmd(htim->Instance, Channel, TIM_CCx_ENABLE);
) e& Y6 u; J1 b% r+ r - T3 C' O. F+ M+ w- `% T4 P
- if(IS_TIM_ADVANCED_INSTANCE(htim->Instance) != RESET) 4 d" h1 W* V7 V0 i, R+ |2 E2 H
- {
. n) x! L" e" n- j* h- ^% t5 N - /* Enable the main output */
; m, d8 S+ s1 \& ]0 S - __HAL_TIM_MOE_ENABLE(htim);
8 v# i( o" C. e; k+ A" }/ x+ Y% V - }
; D: `& Y# y$ d5 S8 O8 q* \ -
# j0 o+ ^- d, e- `5 M# Q* G - /* Enable the Peripheral */! y( j& q* F) s) Y" v
- __HAL_TIM_ENABLE(htim);
( g0 g# I z# B# _6 g -
* ]2 f- ]) R" ^. C. ]$ P - /* Return function status */" A; T/ p: Z& ?, Q O% V
- return HAL_OK;) u$ P* M2 M: y! u
- } $ E1 i$ u! o/ \
复制代码 ( `1 M+ N( H3 s7 K4 _( a& K$ V& q2 J( a
其中的核心代码分别是:
% m8 I' @7 y7 W+ U- __HAL_TIM_ENABLE(htim);7 Z1 ^6 T. i( h1 [% a# S6 [
复制代码- __HAL_TIM_ENABLE_IT(htim, TIM_IT_UPDATE);
6 C( L1 ?. d, \) n# T - __HAL_TIM_ENABLE(htim);. t a8 E/ V5 n% ^: V. A
复制代码- TIM_CCxChannelCmd(htim->Instance, Channel, TIM_CCx_ENABLE);0 Z* u& e" D `, s; C
- __HAL_TIM_ENABLE(htim);7 Y9 o6 L8 Z9 }. V
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: k$ v c9 x7 B" z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。' o# h6 ?, G/ N2 g5 z, f
- __HAL_TIM_ENABLE_IT(htim, TIM_IT_UPDATE);
: j# @+ p4 @/ h" ^0 V! n9 h3 E) B - TIM_CCxChannelCmd(htim->Instance, Channel, TIM_CCx_ENABLE);9 s6 | ?% F* }/ G# _( c
- __HAL_TIM_ENABLE(htim);4 F: Y7 K d' `: J
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S( A# Z" c9 J5 G完整代码如下:
. m% P& Q+ p" A4 N1 |- TIM_HandleTypeDef TIM2_Handler;
+ ?/ j0 x' g4 W - TIM_OC_InitTypeDef TIM2_CH2Handler;
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- static void MX_TIM2_Init(void)
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- __HAL_RCC_TIM2_CLK_ENABLE();/ w. a5 }) y, Z4 F' c
- HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3);
& q* l6 c! }; [; B( ], b9 f0 | - HAL_NVIC_EnableIRQ(TIM2_IRQn);4 [& Y2 i; D% P, v# ] ~8 ]; w8 X7 e
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- TIM2_Handler.Instance = TIM2;1 D6 Q9 u4 D) D& W) |
- TIM2_Handler.Init.Prescaler = 10800;3 T2 _# V$ u5 s+ Z; ~2 W
- TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;! X& j2 N7 `8 t/ c1 I3 B5 K) R2 V
- TIM2_Handler.Init.Period = 20000;
: U& L% \, X0 h3 M, r2 F - TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;/ O1 U* D' l, Q7 }) e
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- HAL_TIM_PWM_Init(&TIM2_Handler);5 ~. I* Q" }- j3 A" D
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- TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;
9 k! _4 [/ M" x9 |0 J+ u# U - TIM2_CH2Handler.Pulse = 10000;4 e/ f( d: c) a4 F
- TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;
/ \ m. F A! g/ E/ k! N - TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;
+ R" o. e( r' f6 p* {! y, X o - HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;9 |- N# J6 f* m- o
, A& @% _4 i' c7 |9 v- __HAL_TIM_ENABLE_IT(&TIM2_Handler, TIM_IT_UPDATE);
9 R, q/ ~) s2 d: }& B! M9 Y7 L, w - TIM_CCxChannelCmd(TIM2_Handler.Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);
# [6 P, l; A q5 y$ c - __HAL_TIM_ENABLE(&TIM2_Handler);$ Q4 R/ X/ }2 o& d% S+ S& Y
- }
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, b4 v6 O, `8 ]- void TIM2_IRQHandler(void)
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- HAL_TIM_IRQHandler(&TIM2_Handler);
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- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim). w% _3 ~; [, j) ?0 a+ j
- {
& l: p# }+ ^: d - if (htim == (&TIM2_Handler))/ q! G0 ~0 T& Y8 w9 [4 T$ e
- {
: D2 x* i& d8 W - printf("enter irq\r\n");
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- }
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- void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
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7 b" \0 t4 t7 B. k- X7 V - GPIO_InitTypeDef GPIO_InitStruct = {0};
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- __HAL_RCC_TIM2_CLK_ENABLE();( W. g' @8 u2 F- G
- __HAL_RCC_GPIOA_CLK_ENABLE();
; `- I' q! _2 F - GPIO_InitStruct.Pin = GPIO_PIN_1;
* c( [/ [( q2 X8 y: @; u; ~ - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
& }" ]$ n5 J0 E& q - GPIO_InitStruct.Pull = GPIO_NOPULL;! a1 Q2 g4 S" H; h O* G: O' g
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;' Y7 W; {& A$ p: t" ]) }6 b7 v
- GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
0 \+ ~# w; u# ^4 J3 U5 x. c# | - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);2 N% Y1 c3 y& T2 \# M
- }
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