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。
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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。 7 {$ x/ U; Y6 |4 c; `) l$ _- Y
LED1:PE1 5 x8 S/ ^* N, K% y. Q
LED2:PD0
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: U) C2 _/ G1 S, l' AUSART2-TXD:PD5 6 U2 V Q) l8 E- Z$ R
USART2-RXD:PD6 ) m+ h. ]' G" |3 }. w
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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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) g+ [, {4 W1 Q8 f( o. c7 X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 , |2 L7 H1 F3 @- M$ p" c7 q( Y2 _ W/ b
5 ]4 O" {& z$ L* s9 t- void LED_Init(void)
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- static GPIO_InitTypeDef GPIO_InitStruct;
' |( \: H- R3 N a. u) \ - __HAL_RCC_GPIOD_CLK_ENABLE();
+ Z# U. b9 A8 i& |" N - __HAL_RCC_GPIOE_CLK_ENABLE();3 D3 w% E$ J S: M2 w7 k
- /* -2- Configure IO in output push-pull mode to drive external LEDs */
1 B, d+ B6 R7 v/ W5 E - GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
8 g, A; o( }' |+ T! F - GPIO_InitStruct.Pull = GPIO_PULLUP;
1 L; A, j, ]" f7 [/ c - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
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- GPIO_InitStruct.Pin =GPIO_PIN_0 ;
1 U5 _/ M5 y5 S' e5 k# n- U - //--LED2
4 Y. p# o( _! C% e - HAL_GPIO_Init(GPIOD , &GPIO_InitStruct);& J1 ]6 a% g7 R. {2 r v" L
- //--LED 1
- u% ]: F* ]7 u- E" F - GPIO_InitStruct.Pin =GPIO_PIN_1 ;; ^7 a+ Q k) z2 ~& N
- HAL_GPIO_Init(GPIOE , &GPIO_InitStruct);! v' A; ]8 U1 k' B, a, Q8 x. [
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- void LED_Test(void)
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- HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_0);
: X& t2 Z5 d _$ d; n - HAL_GPIO_TogglePin(GPIOE, GPIO_PIN_1);
7 _* ^* q8 M2 b! b+ J: N" h - HAL_Delay(500);; W4 T' l `* U, t% r
- }
复制代码LED的代码相对较简单,然后就是串口: * G, L; g p* E2 _
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- #include "DRV_UART.h"7 q1 u) U. b8 s' ?4 Q0 j
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- UART_HandleTypeDef huart;9 R) U1 e( u$ f# O- h3 \3 e
% Z1 ^$ x6 p3 H& X7 U- void UART_IO_Init(void); Z2 L$ i+ ]' E" p" \( u6 X
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- GPIO_InitTypeDef GPIO_InitStruct;
! b' t& r% k0 `' c% I - __HAL_RCC_GPIOD_CLK_ENABLE();/ p3 m1 e: @3 |. @4 m/ H; v
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) u6 p$ {& o f$ g8 K* U9 m7 [! X+ l - //--TXD
; m' z3 N% m# \- N! X - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
' R: C2 k f0 {+ j - GPIO_InitStruct.Pull = GPIO_NOPULL;5 q8 y+ I$ v6 g# o$ o' P
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; ?: a! I1 |% c3 s' ?8 F$ X: g
- GPIO_InitStruct.Pin = GPIO_PIN_5;$ Q6 p0 m4 B7 L6 S; U
- GPIO_InitStruct.Alternate=GPIO_AF7_USART2;5 x! f- T5 i! c7 c" o
- HAL_GPIO_Init(GPIOD, &GPIO_InitStruct); [& v; t) F+ r3 {' u
- //--RXD6 E. O8 d" l' r3 s6 M' T- z
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
$ O8 J: B: N& p* _* P - GPIO_InitStruct.Pull = GPIO_NOPULL;6 e2 k3 X8 p; i# E9 a; E1 m
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;3 j8 Z5 T8 \# O
- GPIO_InitStruct.Pin = GPIO_PIN_6;
) P+ Y( ]) o; r# N0 L7 \ - GPIO_InitStruct.Alternate=GPIO_AF7_USART2;; X+ D% a+ Z4 f- O z- h
- HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
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- void UART_Init(void)
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' u% H& H: Z6 ^' Y# j3 x4 x4 n - UART_IO_Init();
+ C" R1 n" |3 `* b6 G - __HAL_RCC_USART2_CLK_ENABLE() ;# s" e5 ?% S! x* }
- huart.Instance = USART2;8 _. N1 p( `+ |) a) G$ ]
- huart.Init.BaudRate = 115200;; O6 ^$ s; u. i$ W
- huart.Init.WordLength = UART_WORDLENGTH_8B;, G" a5 l8 f! n" n
- huart.Init.StopBits = UART_STOPBITS_1;
" I4 n+ \3 w4 K - huart.Init.Parity = UART_PARITY_NONE;
8 Y* K3 g* b6 f* q& O: N0 E - huart.Init.Mode = UART_MODE_TX_RX;
4 H! K3 Z! t& ^0 r3 m; L) b4 I- [. f - huart.Init.HwFlowCtl = UART_HWCONTROL_NONE;
D5 q e! x6 ^) j - huart.Init.OverSampling = UART_OVERSAMPLING_16;! v6 |6 f0 w6 y6 t3 k: V9 Z6 v
- huart.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;! `% S% J B3 ~# I0 b
- huart.Init.ClockPrescaler = UART_PRESCALER_DIV1;4 i8 T4 Z4 W ?+ |1 b0 j/ Q5 t
- huart.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;4 k2 h \7 A' b& V
- if (HAL_UART_Init(&huart) != HAL_OK)
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6 F6 I. R# d/ |3 a( r1 I- int fputc(int ch, FILE *f)" }6 j- Y' t/ y% V
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- HAL_UART_Transmit(&huart, (uint8_t *)&ch, 1, 0xffff);; ]3 v& U* y& b2 y; I" i
- return ch;% E2 R% _: e7 T3 Z
- }
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复制代码
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完成了串口之后我们就来定时器的操作。
2 p1 r1 P. g: y4 E8 T- #include "DRV_TIM.h"
( K0 B2 o1 c8 N; U8 L - #include "DRV_UART.h"
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- TIM_HandleTypeDef htim1;
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4 }0 D& m1 O8 _* o) L7 f# U! \- void TIM_Init(void)
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5 u" E5 k& M3 U& e6 l. E' M - __HAL_RCC_TIM1_CLK_ENABLE();5 u1 B( \7 G" u4 E& y6 [ C$ f
- htim1.Instance = TIM1;
3 o* }& ]8 h- V% w% m( S - htim1.Init.Prescaler = 0;
) K+ x7 I, }' \* S2 j# Y2 | - htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
" u: s9 j _+ A2 f0 z o - htim1.Init.Period = 119;
0 }+ V- i8 O" y% E" }) N - htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;9 ?& ^6 @% V7 _$ |# F" x/ C2 O
- htim1.Init.RepetitionCounter = 999; w! o) g9 m/ S
- htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
7 ~: g, F5 I* W- @ - if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
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n" n2 S& q9 ^ - HAL_TIM_Base_Start_IT(&htim1);# |! l/ I; _6 y" v0 }. g
- HAL_NVIC_SetPriority(TIM1_UP_TIM16_IRQn, 2, 0);
3 F' _% y3 }* @ @: C8 Q$ s - HAL_NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn);$ W" n Q3 t( }7 q& d
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- int count=0;( q! H9 z+ H0 f
- void TIM1_UP_TIM16_IRQHandler(void)3 {+ l V: w! V% \
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8 a, r9 O) k" Q1 n/ p7 l- if(__HAL_TIM_GET_FLAG(&htim1,TIM_FLAG_UPDATE)!=RESET)2 P& @* m% e M# B% B* ^
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- count++;8 j/ P7 z4 S9 H5 h9 K
- if(count==1000)
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. B+ C# @0 C7 X6 x" I - count=0;$ F; C5 \/ |, \- C8 d4 s0 y
- LED_Test();
& P+ |5 N( Y" U, R# M1 A' t - printf("Hello STM32L4R9ZI !\r\n");
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( h0 ]+ U7 T) c - __HAL_TIM_CLEAR_FLAG(&htim1,TIM_FLAG_UPDATE);$ A* T+ l% x2 `2 C7 b3 t. [
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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 9 n4 B. r5 `* X+ H" k
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- #include "stm32l4xx_hal.h"2 [% I& ?- T# L$ P
- #include "DRV_LED.h"
! j" u; P+ ]/ O2 K1 V - #include "DRV_UART.h"
' t) E& X7 P* g4 e. g; [ - int main(void)
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- SystemClock_Config();& {, _0 [ F; l( q/ ~) l
- HAL_Init();8 _: _8 {0 c4 \& e0 L% D. l
- LED_Init();( a: z4 I9 j* Z) [2 C0 O* K
- UART_Init();
1 U2 o$ A8 ^: t- C/ I2 c3 @ - TIM_Init();
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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。
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0 c- |8 b4 p) R3 ~3 S串口按照1s 的频率来打印串口字符。 ) M6 @% j0 H3 u- s. T6 X
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!~