前些时间收到的开发板,今天来和大家分享一下,首先从硬件的角度来说。/ i8 q. K$ v5 _( k/ |9 H- q" f
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& q+ j3 n8 H x硬件方面,LED和串口的连接方式可以通过上面的图形了解清楚。 . y/ a9 D! A% t
LED1:PE1
, m9 m' r9 N1 `LED2:PD0
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USART2-TXD:PD5
2 J7 g# J- K4 B3 s3 w9 C$ u0 DUSART2-RXD:PD6
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0 ^9 Y& V$ Y2 _$ Q8 [8 w5 b6 R. N4 O两个引脚还应该注意复用关系,我们可以通过下面的表格得知:
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# n/ {' v5 @" {; U0 d/ d有了上面的硬件基础了之后,我们就可以进行编程了,我们首先看LED的编程 9 _7 A+ N( n- a0 D) X
, O6 Z7 [# ]) B" |! E- void LED_Init(void)
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; K7 Q/ }! d" W- n& f - static GPIO_InitTypeDef GPIO_InitStruct;( }) c+ Q* l0 `: \3 G1 X' F3 x/ {
- __HAL_RCC_GPIOD_CLK_ENABLE();
* }7 K( \9 I: m: V! D - __HAL_RCC_GPIOE_CLK_ENABLE();
2 I: ~! e- h6 l% `+ F - /* -2- Configure IO in output push-pull mode to drive external LEDs */5 M. ?' d4 `7 v1 q! ?
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
7 |- ?2 q" H) ^ S - GPIO_InitStruct.Pull = GPIO_PULLUP;$ @! t, K" r; Y) a
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
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- GPIO_InitStruct.Pin =GPIO_PIN_0 ;8 u; k* v0 v1 v, j
- //--LED2
% t+ B: g8 G/ |" v( o: ]5 ?1 d8 P - HAL_GPIO_Init(GPIOD , &GPIO_InitStruct);
5 J: @8 y5 I6 D2 q2 r2 B1 x3 b) ~ - //--LED 1
$ O, K2 m( O+ D8 a- {( D6 m5 U - GPIO_InitStruct.Pin =GPIO_PIN_1 ;- Y0 |# s7 \ H. t1 F) r3 k. Y
- HAL_GPIO_Init(GPIOE , &GPIO_InitStruct);# X! N2 n4 Q2 P4 b! }
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- }
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- void LED_Test(void)* K" z: R/ S% z- g
- {
. X3 E- ~( k' B- p+ h* e( C. c - HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_0);, ]; Z( u; | Y2 C3 h+ }6 f
- HAL_GPIO_TogglePin(GPIOE, GPIO_PIN_1);
; k2 Q/ N; Q3 R: s/ K - HAL_Delay(500);+ k$ n4 G/ Z( T9 w8 _+ u2 D
- }
复制代码LED的代码相对较简单,然后就是串口:
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- #include "DRV_UART.h"# I3 }- u9 J3 H2 M
! H: n0 w( X6 P/ l6 `4 b- UART_HandleTypeDef huart;& B# \9 l, ?9 L0 t3 k/ w
; x& h0 i. C( }, [- void UART_IO_Init(void)
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& u# d" v" S P& t3 `, F1 v$ q - GPIO_InitTypeDef GPIO_InitStruct;
7 h# A' R+ n0 V - __HAL_RCC_GPIOD_CLK_ENABLE();5 D* ]/ P, t$ E4 @; z2 g
-
+ W- h* ~7 o N& _* q0 t - //--TXD( V% B$ t/ [0 n/ J+ L3 w
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
: x& @8 E/ f& D% i6 D3 r - GPIO_InitStruct.Pull = GPIO_NOPULL;
7 h m' u- V8 x+ x; W7 n - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;" ]7 }% T* l% }
- GPIO_InitStruct.Pin = GPIO_PIN_5;
9 N7 |) y5 l% v( ^) M - GPIO_InitStruct.Alternate=GPIO_AF7_USART2;
% F- h6 L3 w. i/ j: M% c& D. P - HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);8 A' _% J" x6 `6 H' _
- //--RXD
$ I) p0 P* S- e3 d n - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
- F, f5 E, X7 y( u1 E0 } - GPIO_InitStruct.Pull = GPIO_NOPULL;% w6 o( ~; l" V! Z! Y
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;0 p4 Y. M3 w2 ?- t# C6 b7 B, K. W
- GPIO_InitStruct.Pin = GPIO_PIN_6;% x) Z7 @% e z+ |
- GPIO_InitStruct.Alternate=GPIO_AF7_USART2;$ l; ^( y8 a( t$ f8 y4 ]
- HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);7 B- S5 z4 r' ^
-
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! E! K$ G& O- W; V! m- void UART_Init(void)
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8 ?1 ?) n' `$ a6 g/ p1 P - UART_IO_Init();+ n3 s" Q5 U1 z/ Q/ v# g6 h1 U& e$ r
- __HAL_RCC_USART2_CLK_ENABLE() ;
( }3 ]" g* Y) `2 [6 M1 E - huart.Instance = USART2;
; h, { C2 y# V$ U - huart.Init.BaudRate = 115200;8 I3 u0 E( Z1 B3 j$ h, c% c c9 s
- huart.Init.WordLength = UART_WORDLENGTH_8B;+ `6 A; r( C: |7 a
- huart.Init.StopBits = UART_STOPBITS_1;
6 F# U6 I3 k! o# k. c: A& W( w" r - huart.Init.Parity = UART_PARITY_NONE;
+ B& X6 c( B- X$ Q - huart.Init.Mode = UART_MODE_TX_RX;3 D' i5 _) {3 t, z+ r5 P
- huart.Init.HwFlowCtl = UART_HWCONTROL_NONE;
" p- H- b& A& ]7 @# F5 n - huart.Init.OverSampling = UART_OVERSAMPLING_16;
+ a) ]* u: S( h8 V0 R - huart.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
) |0 @8 f* H) ^0 J+ ?0 v - huart.Init.ClockPrescaler = UART_PRESCALER_DIV1;* F, D8 ~; S8 ]: o; }
- huart.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
% y9 E- r8 ?+ c - if (HAL_UART_Init(&huart) != HAL_OK)
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- int fputc(int ch, FILE *f)5 O* I* W# a9 B5 e: P4 p
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- HAL_UART_Transmit(&huart, (uint8_t *)&ch, 1, 0xffff);+ }8 R1 C& S y
- return ch;
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/ w' Z4 ]6 I( Z r5 [' k完成了串口之后我们就来定时器的操作。
0 _; y5 H" T' \% l- #include "DRV_TIM.h"
. q% ]8 w' r }; b0 K - #include "DRV_UART.h"7 H! O$ o$ O! \; y$ b! R
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. q0 ^, t' T& \& h) v. j- TIM_HandleTypeDef htim1;
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% A, S6 {! V. ]- void TIM_Init(void)" m. ~/ b F8 L# i
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" ^* g5 e3 T7 J% l) j - __HAL_RCC_TIM1_CLK_ENABLE();
1 g" e/ }5 Z9 I5 b# M9 z! w - htim1.Instance = TIM1;) G- I0 \% k3 E% X. F
- htim1.Init.Prescaler = 0;
! n4 W% x. M' k( I. [1 Z/ r% y - htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
+ D( v S* Z6 Q n" B0 a - htim1.Init.Period = 119;
) u5 f, `% A6 S& J0 ~. O - htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
& |9 i0 G1 G1 a: Z7 g+ y - htim1.Init.RepetitionCounter = 999;# N/ {+ Z9 ^; v( w0 f$ X
- htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
7 d m: j. u7 P J8 n. g+ P, n0 N - if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
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-
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# M- M9 j% X. `9 S - HAL_TIM_Base_Start_IT(&htim1);
- s/ S" _- d8 W - HAL_NVIC_SetPriority(TIM1_UP_TIM16_IRQn, 2, 0);
) J3 ?/ j R# [9 w: d - HAL_NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn);# d4 N5 H% t* x9 _+ d4 F
- }
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- int count=0;
# ?# x8 t+ Z1 \5 t/ o - void TIM1_UP_TIM16_IRQHandler(void)
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1 `( Z/ D# g$ y& C( E- if(__HAL_TIM_GET_FLAG(&htim1,TIM_FLAG_UPDATE)!=RESET)6 ]6 _! R) {/ r' e# g
- {: c/ K1 C5 O" M0 N* Z* N' ]
- count++;
* F6 B4 {0 {3 `! t$ ~% U9 Z) w8 E - if(count==1000)5 s% Y" b! S7 R% g
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- count=0;5 P, D& \3 e6 e( k- h. i
- LED_Test();) k& V% V: |+ g' e% M
- printf("Hello STM32L4R9ZI !\r\n");, Q* a/ L7 E' k5 q0 i. [# |
- }
% c$ `0 v: _9 K: I! r a+ G e( S' Y - __HAL_TIM_CLEAR_FLAG(&htim1,TIM_FLAG_UPDATE);7 o5 y# _. \3 _: \# f
- }
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复制代码完成上面的代码之后,我们经过主函数的调用 & Y O4 l- A! h) d. f
& y4 T" A5 P8 h5 c3 h9 n- s0 ]- #include "stm32l4xx_hal.h") M- a0 _ O* L+ r0 T" t
- #include "DRV_LED.h"
' x& r) y. p5 s ^ z - #include "DRV_UART.h"
8 @% L3 t3 A0 w8 i; ?, T* p - int main(void). ~! H r! U/ S1 ^2 K# |
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- SystemClock_Config();5 G0 t# B% A2 Y0 e& S( \
- HAL_Init();' @# @4 n! i, r1 W5 c4 I$ S1 v
- LED_Init();
5 t, R+ b/ O1 O+ L9 Z - UART_Init();% x- @ x+ U e. Q. n( l) M
- TIM_Init();; b6 f8 |$ v8 a1 Y5 x: [ E
- while (1)* @) i: h) ?6 g3 U& M( c0 A8 d. G
- {
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- }
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复制代码整个串口,LED、定时器的测试工作就完成了,我们来看一下具体的效果。 : n7 n5 E6 Z* L: b% \
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) k6 I: O1 J! x/ o% _( g串口按照1s 的频率来打印串口字符。
8 c/ R( x0 V. u$ _0 \4 k两个指示灯也按照1s的频率来闪烁
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细致、全面,对小白很友好!~