PWM的测试选择了 FreeRTOS_Mutex 例程,主要是因为 PWM 的输出需要更加严格的同步和控制。低功耗模式不适合该应用。PWM的输出设置需要理清程序的同步逻辑。程序首先定义了两个线程Thread1和Thread2,一个Mutex锁信号MutexHandle,通过这个信号进行 UART 资源的保护运行。
% c9 J- ?! e, G4 r& X6 g# @
% e- B$ Z) _6 x% u+ p( C- V- 7 C0 f; R; H! V' R9 `4 Y9 }+ B
- osThreadId_t Thread1Handle;
) w& ]$ a5 w0 H) Z# i+ k5 j - const osThreadAttr_t Thread1_attributes = {
1 f, G. f' u$ {* e, z9 G - .name = "Thread1",7 V6 L/ \8 O$ Q5 `1 ]( |
- .priority = (osPriority_t) osPriorityNormal,
( J5 [2 S4 A1 F3 j3 T: ^6 l - .stack_size = 256 * 4
) X& h- S- v& K: S: ^; g. H3 ]. [, e - };& v z/ M u9 W0 n5 c2 d9 V% o
- /* Definitions for Thread2 */* u) j$ ^, k4 p6 d" n8 d
- osThreadId_t Thread2Handle;& T& I# }' w9 L, q, {
- const osThreadAttr_t Thread2_attributes = {
' S" l0 @# ~5 U* } - .name = "Thread2",3 ?5 J) Q! _: I4 E2 X
- .priority = (osPriority_t) osPriorityNormal,
7 [) z/ g, e9 N5 J% O2 `- ~ - .stack_size = 256 * 42 v. h- t% Y+ L+ `, ?
- };" M8 ]$ R% J9 t. p! J! S* }2 N$ N
- /* Definitions for Mutex */' F! W3 ^; k# X3 f( L0 o5 h1 m5 w
- osMutexId_t MutexHandle;; t, e; a4 y7 [$ S8 z5 d F& N
- const osMutexAttr_t Mutex_attributes = {
& G5 T0 [( S2 f9 X0 f4 o - .name = "Mutex"
; G+ Y1 V# ]* _- x" L - };
复制代码 [color=rgba(0, 0, 0, 0.9)]首先两个线程在运行前半段使用信号锁进行共用资源 uart 的运行,后面进行运行。
5 K, g/ M- M9 q; a; e[color=rgba(0, 0, 0, 0.9)]* O. ~ k" [! B- p+ L* T: b( Y5 e' v
1 q$ i4 V/ K ]8 H5 a
- 5 q! f6 e. O/ q8 d4 f* I; L: [/ f
- /* USER CODE BEGIN Header_Thread1_Entry */
% P4 I5 Q; [6 w" Z+ l0 o9 d - /**8 W6 | S3 a) S
- * @brief Function implementing the Thread1 thread.
4 T) I1 a P# H& z3 |* a4 [ - * @param argument: Not used. c5 P* x p$ d) S$ i9 D9 y3 H
- * @retval None6 f/ ?# K; u" j* N; Y" v" w
- *// r: w* ]+ Y$ {+ Y* q/ x9 ]6 T! {2 v
- /* USER CODE END Header_Thread1_Entry */! H& l0 V8 j# i4 N. }9 A& f
- void Thread1_Entry(void *argument)3 l% v, @# d1 Q
- {2 A' \3 P# E1 D
- /* USER CODE BEGIN Thread1 */# e' U" G( T4 } h) q# Q' t- E
- uint16_t i;( G& T8 d) i' _
- /* Infinite loop */% O, Q8 J w6 X. s
- for(i = 0; i < 10; ++i). T2 ]. f/ e5 q2 ]# u5 h9 X
- {
: }, b A! c0 q" [, P$ ]! U - #if EXAMPLE_USES_MUTEX
) d, v/ _8 _7 m% L( @ - osMutexAcquire(MutexHandle, osWaitForever);, [' G" C: v' u
- printf ("Thread1: Mutex Acquired!\n");
# C* z$ W4 }( \- c2 K - #endif
. N" P2 A' O/ d - / j/ z d6 o+ x4 g9 Y$ i) _
- printf("Thread1 : This is message number %u\n", i+1);
, T' g4 H/ d) j -
`5 n; j$ }$ {. ?( Y4 p! Q7 x8 o - #if EXAMPLE_USES_MUTEX1 y! a0 l3 d* y: K0 X0 E; g* {
- printf ("Thread1: Mutex Released!\n");5 @3 p: W% ^ \5 G" x( k! t9 \9 F9 F. t
- osMutexRelease(MutexHandle);3 C, Z7 |% { O+ F$ Y
- #endif0 Y8 r' e& E# [( k
- HAL_GPIO_TogglePin(LED1_GREEN_GPIO_Port, LED1_GREEN_Pin);0 _# ]8 j3 R7 M. \* q5 ^
- osDelay(200);8 Y% B/ ]* b8 F( S$ c
- }
* a: W' y# V; R4 v! K$ ^+ w" ^ - 5 b4 m( V. S, ^( k
- while(1)
' Z/ q* Q* J* B - {% m5 E) ^9 v7 L5 y+ G$ \: L: z$ h& g
- HAL_GPIO_TogglePin(LED1_GREEN_GPIO_Port, LED1_GREEN_Pin);0 ~+ N2 _( A7 r1 L
- osDelay(1000);
6 g+ U! O9 A) J/ }& A2 l - }
: j) t1 r7 ?9 w( Q - /* USER CODE END Thread1 */7 i- n; D: \5 h/ ~0 X' A9 u1 N
- }
- c: H! ^( M6 X - : w2 F# ]: ?9 {* u
- /* USER CODE BEGIN Header_Thread2_Entry */" j' x" m6 H8 n; P. W% X3 U1 M
- /**
1 M* q/ @& i2 `, \/ U2 X - * @brief Function implementing the Thread2 thread.
& q$ d* o* X6 r# M - * @param argument: Not used9 c5 N0 L" G1 P, X6 U$ v
- * @retval None# T6 a8 O6 @* w
- */
. R+ x) x( f9 c( G+ Y; D4 G; Z - /* USER CODE END Header_Thread2_Entry */
8 E, @3 E6 e# b. c' q - void Thread2_Entry(void *argument)
7 A. ?; J; k, a Q$ C$ T - {
- E6 N7 h& i! M2 c, n5 w - /* USER CODE BEGIN Thread2 */
$ n1 g g( Y& o7 |' V, w0 M* c - uint16_t i;6 u$ @6 g* p. ?% }/ o+ \* p7 v
- 0 \6 ]5 Z. E5 C/ n
- /* Infinite loop */
5 v! q3 N! a5 l7 f3 O. d% z - for(i = 0; i < 10; ++i); N* j: i9 v! B
- {0 n) _8 \' u7 I8 ]* t
- #if EXAMPLE_USES_MUTEX
2 e" ?* F" b6 m% `# R6 G" U8 K9 I - osMutexAcquire(MutexHandle, osWaitForever);
* O. t* u g$ y" R - printf ("Thread2: Mutex Acquired!\n");
1 T; ^8 |' q v. V) o; G& d - #endif* F& ]$ I8 W2 U. Z$ J: E5 _, K6 E$ S7 \
- + q$ x, ~6 F2 I% ~# P. {
- printf("Thread2 : This is message number %u\n", i+1);
0 R8 h' \! w9 B# _0 p - #if EXAMPLE_USES_MUTEX. M8 q3 P+ T c9 T/ d% P$ z- l
- printf ("Thread2: Mutex Released!\n");+ p2 W- F" k9 [, D- Q, v
- osMutexRelease(MutexHandle);! L! P$ }, u7 t" q9 O) c+ J* f
- #endif
, b ~# W7 Q9 t - HAL_GPIO_TogglePin(LED2_YELLOW_GPIO_Port, LED2_YELLOW_Pin);; ~7 c, `9 Y3 u; L4 ^
- osDelay(200);+ \. c' P( l% n, D) M6 c8 t6 Y5 f
- }
$ l8 V' M) u' l( z, _- w% h - ' o, w( ^5 c9 g; i% \
- while(1), W+ M- d- G5 N
- {
8 q7 @( P) {3 m- s* n# G8 Z+ L - HAL_GPIO_TogglePin(LED2_YELLOW_GPIO_Port, LED2_YELLOW_Pin);' a( U ?8 X% w+ P# q8 Q$ N
- osDelay(1000);5 M& K: I% t0 s5 g8 a
- }
6 F4 ?. O2 z6 Z( \4 R3 G - /* USER CODE END Thread2 */. _5 k4 t$ `4 {/ d& Q8 H
- }
* f) H: J) {# B4 N
% B, w F j* k, j) O$ u- k7 y8 S; Q7 K- /* Private application code --------------------------------------------------*//* USER CODE BEGIN Application */
, H% y+ B; `3 J: U! e) |7 y, E - /* USER CODE END Application */
复制代码 ( G, h/ `1 G1 D
$ ?1 i7 o( _3 ]& V# K9 x. d# c( T' `进程先获取信号锁,在进行打印输出,输出完成后再解锁,这样可以保证三段打印都是同一个线程的输出。可以看出每次的输出都是一个线程的信息。下面进行PWM的改造测试PWM的设置如图,使用LED1作为PWM的输出,所以设置PB0作为TIM3的CH3通道,PWM输出,脉宽比为50%,所以计数为2048,PLUSE VALUE=1024。设置好以后将程序进行改造,另起一个项目通过CUBE生成初始化代码,然后改造项目。
+ Y9 z7 a3 _/ l5 Z- /* USER CODE BEGIN Header_Thread1_Entry */: y$ c4 X0 ]8 }& }( F
- /**3 n- j- F- M, } Y- c( z5 @
- * @brief Function implementing the Thread1 thread.1 D2 c% Q% \, _( C% i j
- * @param argument: Not used" H% U: \: {& s# d. `
- * @retval None
" b) H+ S5 d% o% c K/ g0 W - */# `& t1 `4 I* e4 [) j& W5 q
- /* USER CODE END Header_Thread1_Entry */
! g' F0 V3 V. z+ e0 Q - void Thread1_Entry(void *argument)( u7 l" k' z. O& [6 `
- {
5 E! a$ Z9 x! k- w1 ]6 @7 x6 U - + N6 E8 ~# u" \. W0 G
- osMutexAcquire(MutexHandle, osWaitForever);. A# Q& X$ P. `; x( ^
- printf ("Thread1: Mutex Acquired!\n");2 ?0 V- B3 |3 {
- printf("Thread1 : PWM starter\n ");+ l9 X* a- A) Z5 Y7 V
- printf ("Thread1: Mutex Released!\n");- \* J4 M, a4 R& i+ U
- osMutexRelease(MutexHandle);- D, d3 f1 \5 Q" J& x6 _) Y
- HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_3);
* x3 P7 c5 h$ B3 H+ a6 `+ L5 M - while(1)
/ n4 V% o; g6 ?1 t9 k. U - {+ M, n9 Q$ `( @' p
- osDelay(1);
; _# j! t/ g8 }3 S( z+ r7 g4 O0 o - }
4 k" F2 Z! j' ?/ y - /* USER CODE END Thread1 */ S' h) ^6 g) `
- }
复制代码 项目启动后。可以看到LED1开始开始工作。% V: Y# l, b' P4 z* _, I4 o
' v3 Q( ?% r3 x! m* a: n7 F来源:EEWORLD论坛网友 bigbat 版权归原作者所有
4 Q8 ~* t* `1 o% [* O: B0 h4 I
9 t! T% {+ t) m. }. Z' r
( l6 s( J' u7 n+ M% ]# K |