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。' x7 a% |" x, `, C
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; P. t! H- R: _& ~1 U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: ^8 U3 i: j y
LED1:PE1
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USART2-TXD:PD5 / X8 E d, }+ a* E9 @
USART2-RXD:PD6
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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: , N9 ~: K6 ?' X, F# s& O% N
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d$ B: y7 w& V: q& |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
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3 y7 ?* k3 [/ j: }, |+ |- void LED_Init(void)
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5 j0 F3 B) T, P! n3 s - static GPIO_InitTypeDef GPIO_InitStruct;
`- ~" Q* H5 L, m; h0 |3 s - __HAL_RCC_GPIOD_CLK_ENABLE();
3 z a- G9 O* y6 ?4 n( i - __HAL_RCC_GPIOE_CLK_ENABLE();( W7 l! t/ U: Y3 k7 z$ K2 @4 K
- /* -2- Configure IO in output push-pull mode to drive external LEDs */6 E( B, B# A. s4 o6 A% l2 x
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
, Y( E1 \% j( } - GPIO_InitStruct.Pull = GPIO_PULLUP;- q: @" b7 Z+ ^4 _/ _
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
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- GPIO_InitStruct.Pin =GPIO_PIN_0 ;
' L% w" }7 S* ~2 B- p* O4 w3 s - //--LED2
, E4 W2 l" g* W L1 s - HAL_GPIO_Init(GPIOD , &GPIO_InitStruct);
" `8 _5 W2 h' |. { - //--LED 1; y( S, H w) Q J3 n6 a$ d
- GPIO_InitStruct.Pin =GPIO_PIN_1 ;) ^9 G5 p/ N. p# v* f. V; f
- HAL_GPIO_Init(GPIOE , &GPIO_InitStruct);9 [# U6 H# v; X7 L6 ]8 ~
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5 ~. B% I9 P& I9 Q% o' M f- void LED_Test(void)
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- HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_0);- x+ C0 a8 O2 V5 P
- HAL_GPIO_TogglePin(GPIOE, GPIO_PIN_1);
: C6 O& t9 Z% ]+ w - HAL_Delay(500);5 {+ e% `1 E& i" x r0 I
- }
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"
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0 c- \4 ~* n1 ^6 Z- UART_HandleTypeDef huart;
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- void UART_IO_Init(void)8 c& U) ?1 t: Y; U" [) o
- {
1 @* M% b3 G6 Z - GPIO_InitTypeDef GPIO_InitStruct;1 c X0 f; g0 @1 @
- __HAL_RCC_GPIOD_CLK_ENABLE();
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/ c3 I! e) a( E" p$ @# b: P - //--TXD- B) C* v+ s; |8 s3 F
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
1 j! O# |' r6 D* M- u$ Z - GPIO_InitStruct.Pull = GPIO_NOPULL;
0 @0 J3 l4 n1 L( ]" z& }% b' G - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
9 i6 k' G6 r. ~0 ?! w7 g0 E2 q: K - GPIO_InitStruct.Pin = GPIO_PIN_5;3 V a" M2 i5 y3 }* D2 u z$ W
- GPIO_InitStruct.Alternate=GPIO_AF7_USART2;9 E7 o6 E p) F% c6 Z: t2 Q
- HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);. H7 W1 q, `9 k/ h7 U) o# ~& Q
- //--RXD' z5 T" O" C+ b9 r1 c5 s
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;% f; G1 L H3 ~% L
- GPIO_InitStruct.Pull = GPIO_NOPULL;
1 n$ c+ q& e( j8 H - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
' m' v' }3 H- H) n) T" d% K - GPIO_InitStruct.Pin = GPIO_PIN_6;: O: d: X1 R5 |6 f+ c
- GPIO_InitStruct.Alternate=GPIO_AF7_USART2;
# J' O* u; o: q. A3 F0 b2 O - HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
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- void UART_Init(void)3 j( D; j. l# I) C% a' I
- {
. i7 [$ ~, V/ J G - UART_IO_Init();
. @ g" k4 d! `9 p, y, r/ A - __HAL_RCC_USART2_CLK_ENABLE() ;
1 f9 q z/ t# N - huart.Instance = USART2;6 ]) Y+ S8 J( Y: U" Z
- huart.Init.BaudRate = 115200;7 S0 e' j3 m) y. r
- huart.Init.WordLength = UART_WORDLENGTH_8B;
! ]9 p0 A" x5 e4 g3 \ P, a. I - huart.Init.StopBits = UART_STOPBITS_1;
+ R) D, i; w1 s( k7 H2 G - huart.Init.Parity = UART_PARITY_NONE;9 g1 B9 t: g, D* I \
- huart.Init.Mode = UART_MODE_TX_RX;
$ a+ I5 N0 g- W1 `* i - huart.Init.HwFlowCtl = UART_HWCONTROL_NONE;
2 _4 p h/ ~, M4 t, f5 t - huart.Init.OverSampling = UART_OVERSAMPLING_16;# j& s& k& _4 k" R% V4 B
- huart.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
1 W: o! p5 o- l' F4 T& C8 a. T" I5 s - huart.Init.ClockPrescaler = UART_PRESCALER_DIV1;
0 S: i: b6 y0 g; J7 C$ U6 v! E - huart.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
: n% U- W5 Q( ?9 ~% @& ] - if (HAL_UART_Init(&huart) != HAL_OK); Q* V2 \& I! K
- {
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- }
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" F" E! K6 B: r$ G- int fputc(int ch, FILE *f)" S+ p% c3 d# {/ b
- {
! D( Y, Q' y+ C, ` - HAL_UART_Transmit(&huart, (uint8_t *)&ch, 1, 0xffff);, C m- \& n: `) F: _
- return ch;& `- ^( g5 t8 Q5 T
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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。
0 U* Q5 _4 v) _8 S( L, ?- #include "DRV_TIM.h"
( [/ E9 C9 d# A4 d7 s% O - #include "DRV_UART.h"
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- TIM_HandleTypeDef htim1;
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# ]& L( q3 m ^0 g: l" w5 J- void TIM_Init(void)
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2 J: z0 V7 U5 q- y - __HAL_RCC_TIM1_CLK_ENABLE();% Q* A3 p% v* c4 z4 Z9 Z8 v
- htim1.Instance = TIM1;
4 Z& l2 u0 `& v3 |. C* c) F - htim1.Init.Prescaler = 0;
1 w$ q$ E% {, l. e, Z# \: | - htim1.Init.CounterMode = TIM_COUNTERMODE_UP;/ }+ C- f/ I1 m, p2 U# t
- htim1.Init.Period = 119;
; g$ m' L. K B2 m - htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;2 m& h$ j+ x9 ?! ]' O+ Z4 F
- htim1.Init.RepetitionCounter = 999;7 R7 e7 k0 G5 f" ?/ Y
- htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
; ]) O2 f% f' z7 S+ I5 ? - if (HAL_TIM_Base_Init(&htim1) != HAL_OK)# D8 Q0 B' C' Y
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- HAL_TIM_Base_Start_IT(&htim1);
& L) l# ?. H1 [, B: {2 Q - HAL_NVIC_SetPriority(TIM1_UP_TIM16_IRQn, 2, 0);1 a: A" S5 y [/ ~* |8 ]/ h- T, ~
- HAL_NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn);
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* s: d. u1 A& N- x# K7 l- int count=0;& f. |( b! @ I0 S: X
- void TIM1_UP_TIM16_IRQHandler(void)0 {" B( D- }) S7 J
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0 Z- Q) I: X2 Y$ o9 M( B1 G* j- if(__HAL_TIM_GET_FLAG(&htim1,TIM_FLAG_UPDATE)!=RESET)
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3 y" r; E# m0 e6 c) i5 V - count++;
# a& ~: o, p7 E/ k - if(count==1000)# i" M% ^, q7 l
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- count=0;
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- printf("Hello STM32L4R9ZI !\r\n");
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- __HAL_TIM_CLEAR_FLAG(&htim1,TIM_FLAG_UPDATE);9 m8 B6 ?* }; r$ q8 C; ?
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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
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" w+ Y5 P- C: l$ H% C0 d$ z/ M- #include "stm32l4xx_hal.h"5 H) N0 `4 p h$ Y% q
- #include "DRV_LED.h"9 C* T$ ~7 P/ F( ^. s0 z* A/ B
- #include "DRV_UART.h"6 B; g: e+ W0 H) S
- int main(void), P6 s! T" P% i; y6 p+ t
- {
* y6 n/ o$ O/ K- K - SystemClock_Config();: `$ ^8 U2 Z3 Y4 v
- HAL_Init();
6 `0 y8 G; s+ N - LED_Init();
, ?% W( ]2 R. {1 b6 u - UART_Init();7 ~7 K. X. ? t0 E4 B* j# R
- TIM_Init();+ f7 G; m% b3 M9 U, j; Q
- while (1)
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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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) P* ]; a" i. U& Z串口按照1s 的频率来打印串口字符。 " p" D1 y9 N( ?! D. V
两个指示灯也按照1s的频率来闪烁
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