当年学STM32从正点原子入得坑,很习惯它的那套程序架构及几个核心文件~这了我已官方的例程为样板稍微修改下~3 p5 y y% T0 ?
作为B-U585I-IOT02A开发板之自用程序模板~) } O( r7 G2 [
主要开启了SYSTICK 作为延时函数基准,具有毫秒微妙级别延时函数,USART1作为调试串口,快速printf及接受数据~
# u+ O5 ^+ M$ d6 u. C- Q8 n" j并调了一个LED~主循环代码为查询串口,并输出输入的字~9 h! e6 g& C+ c! R
结构:
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sys包含数据类型的简化定义定义及一些汇编指令~
% w1 k$ I4 _7 ^, J4 f" r/ ^. V$ {delay包含us及ms级别延时及延时初始化~/ [$ |/ Q% B! X0 E2 D$ e
usart_debug包含串口printf重定向及串口接受中断函数,数据接收均以“\r\n”为结束标志~) a( N* z( x8 I
串口初始化:
: D- L9 @* x4 G! F; e4 Q7 L/ p- void MX_USART1_UART_Init(void)
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; V# _3 G3 K/ A- /* USER CODE BEGIN USART1_Init 0 */
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- /* USER CODE END USART1_Init 0 */
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0 b3 |" A/ N0 s/ e8 E. v4 a$ U- /* USER CODE BEGIN USART1_Init 1 */7 Z0 @& S2 _3 C4 b; U
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- /* USER CODE END USART1_Init 1 */$ T" j' ]! J9 Z4 D
- huart1.Instance = USART1;9 J W7 A8 S6 x5 n3 A2 X
- huart1.Init.BaudRate = 115200;: ~4 o. ^ D& z }- c/ N( ] v1 i
- huart1.Init.WordLength = UART_WORDLENGTH_8B;4 f: B: W/ x: [5 t5 Q/ _
- huart1.Init.StopBits = UART_STOPBITS_1;1 `. S0 n3 E4 ?; }0 v6 V8 U
- huart1.Init.Parity = UART_PARITY_NONE;$ j. J% p+ R1 X: u% T' R" Y! R
- huart1.Init.Mode = UART_MODE_TX_RX;0 h% p! Z4 q, b, b( o: {4 ^; r% f: \
- huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;3 j% t: N/ W8 h
- huart1.Init.OverSampling = UART_OVERSAMPLING_16;" I2 Q8 `' m! \1 [2 f) y3 t& Z
- huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
; M+ x, y x) Z$ e - huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;, a4 E& p- I( W3 {1 b
- huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;/ C) H' m6 ?6 E3 _. ^
- if (HAL_UART_Init(&huart1) != HAL_OK)
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9 a4 I1 T5 y! x - Error_Handler();
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( z, f9 I) T( f+ m/ {& t - if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)3 j4 |: J7 p8 `7 i9 S$ e
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9 j6 ^: r9 m" s$ ?, [6 Z8 t - Error_Handler();! g/ ?1 z( N: }9 t3 l A
- }
! S% \. h4 b! R( @7 j - if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)0 x4 T) I' R/ A- _8 ]
- {
( F" \/ N" ?9 I5 `, w - Error_Handler();7 l: X) y. |# |- m2 l' L$ @5 A( S
- }
$ m ~2 P/ W1 i) s" q( P3 {$ A - if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
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4 M' O. c( W. H, ?9 }( U - Error_Handler();
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( ?6 ~9 J: [' F8 j - /* USER CODE BEGIN USART1_Init 2 */$ }7 D$ k% ?) e9 d+ |) l
- #if EN_USART1_RX
. f' B3 n0 g; ^* @ - HAL_UART_Receive_IT(&huart1, (u8 *)aRxBuffer, RXBUFFERSIZE);//该函数会开启接收中断:标志位UART_IT_RXNE,并且设置接收缓冲以及接收缓冲接收最大数据量% j, F/ i' l- v6 Z" e9 h$ U
- #endif: u k) a- N: ]+ P
- /* USER CODE END USART1_Init 2 */. j6 i: h# \" r+ T1 y$ m9 f1 {
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复制代码
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串口中断会掉函数:
- @, l7 h U6 }- |! J3 H- void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
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- c6 q- r+ B' L3 y+ {: M- if(huart->Instance==USART1)//如果是串口1
3 U( E, S# f8 J7 G1 | - {
3 j! i6 s/ p/ Q' m - if((USART_RX_STA&0x8000)==0)//接收未完成
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- if(USART_RX_STA&0x4000)//接收到了0x0d
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$ [% L% E- F7 f) d; K - if(aRxBuffer[0]!=0x0a)USART_RX_STA=0;//接收错误,重新开始! P8 u% \. A& H' a! H1 P9 ]
- else USART_RX_STA|=0x8000; //接收完成了 1 j/ ^& y0 Y. _7 H
- }
8 \5 o8 E- n: X% `" p- j9 p - else //还没收到0X0D1 K& q9 @* V6 {" I, w9 V# V0 m
- {
f5 v C* u$ }4 {. K5 C/ }" x& S - if(aRxBuffer[0]==0x0d)USART_RX_STA|=0x4000;
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- USART_RX_BUF[USART_RX_STA&0X3FFF]=aRxBuffer[0] ;
& z6 X6 V4 `7 X, \% c8 N0 a - USART_RX_STA++;
4 \ E9 @% Z& c9 E1 }1 {0 `8 V9 W - if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//接收数据错误,重新开始接收 % x$ Z& y) k( W, b: M1 Q2 W
- }
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- HAL_UART_Receive_IT(huart,(u8 *)aRxBuffer, RXBUFFERSIZE);
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- }
复制代码 delay函数:
. m! h1 w6 W x4 y- void delay_us(u32 nus)1 Y; l4 C {- p3 g: |( m
- {
. V2 X& ?% B0 L; o8 i& N- ]/ B - u32 ticks;0 Y6 A- v I {6 B( n0 U
- u32 told,tnow,tcnt=0;/ s5 S, ~& z' ~6 S. v: v Y: F' ?" D g
- u32 reload=SysTick->LOAD; //LOAD的值 # V( W/ n6 ?# h/ ]: n; a
- ticks=nus*fac_us; //需要的节拍数 - [- U4 S4 X: U0 i& n1 W# r
- told=SysTick->VAL; //刚进入时的计数器值
. E4 l" {) Y/ }/ {) ?& e - while(1)
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( I4 D# |5 e5 @" D - tnow=SysTick->VAL; 1 E& F0 o3 U. r, q% b1 _& V# F
- if(tnow!=told)& _* o' F8 i L
- {
6 l2 v; L: `1 J+ x& f - if(tnow<told)tcnt+=told-tnow; //这里注意一下SYSTICK是一个递减的计数器就可以了.
& a9 F1 _8 \+ d# x, n3 l/ @ - else tcnt+=reload-tnow+told;
* r; w, t- x+ h- g# v - told=tnow;0 Y% e+ n; x% D6 m4 \
- if(tcnt>=ticks)break; //时间超过/等于要延迟的时间,则退出.
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' o" n! x6 c \5 y* ` - //延时nms
6 Z$ @/ V! }5 z - //nms:要延时的ms数
; J2 U x. c! Z- ~ - void delay_ms(u16 nms)* Y# `1 q3 a# w
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- u32 i;
' @6 h0 \' c" t - for(i=0;i<nms;i++) delay_us(1000);
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复制代码 main,c
3 n6 H; M% p6 a& T( h; |- int main(void)/ Q- W; X5 K6 w' o( V& `: e# q
- {
{: L/ W& h/ y! {: S - /* USER CODE BEGIN 1 */- M# ^' m+ B; K3 E* h6 Z/ o
- u8 len; 1 K& X6 d" D8 B' j4 R; i
- u16 times=0;. ^- I; Z5 g ^6 M6 q0 }
- /* USER CODE END 1 */, z0 v) b: r) [& R3 l" }
1 t' f5 N2 C) v- /* MCU Configuration--------------------------------------------------------*/$ v# M2 q# n8 S+ f, d' \/ _
' \7 T7 w+ h. F) @9 ]$ C; f- q7 }- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */3 e' j0 d2 F7 E; N2 s& s
- HAL_Init();) v$ m- ~9 O8 m4 w7 ]& @$ _ `/ W3 {
' B0 v, \% p ~8 y6 \- /* USER CODE BEGIN Init */
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- /* USER CODE END Init */6 z& N: V! o& [
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- /* Configure the system clock */ z- a; `4 ~/ b8 L+ h
- SystemClock_Config();
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- /* USER CODE BEGIN SysInit */$ N- J( H4 K2 J0 W
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- /* USER CODE END SysInit */
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- /* Initialize all configured peripherals */! S( K Q' }; e d. l; V! H
- MX_GPIO_Init();$ T- z, g0 }- x+ y/ x, ?/ n2 Q
- MX_USART1_UART_Init();+ W. c5 o; u }0 }
- MX_SPI2_Init();5 i' I$ ~! N; `
- /* USER CODE BEGIN 2 *// R W$ b# x# i! p- V( c
-
K2 W" b6 {4 q- v- s: ^ - //uartdbg_init(115200);9 d" q l# b/ I' ^" k* Y7 l% @6 D
- delay_init(168); //初始化延时函数
A6 N7 K; J( k! ?! l - uartdbg_init(115200);
& c7 w$ N* E, ~) L. n" l - LED_Init(); //初始化LED
- j/ G' q& R2 a k - /* USER CODE END 2 */
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- /* Infinite loop */$ {5 k. W& |" [. r
- /* USER CODE BEGIN WHILE */
7 O5 o( n9 ^, q# j7 g) c5 W6 F - while (1), P4 f0 V8 S6 g/ o3 |) C, K
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- if(USART_RX_STA&0x8000)) ]+ h- `1 n V. f
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- len=USART_RX_STA&0x3fff;//得到此次接收到的数据长度2 g3 ]! M K( W0 z- u. m( i
- printf("\r\n您发送的消息为:\r\n");$ A; V+ P' @; E; |
- HAL_UART_Transmit(&UART1_Handler,(uint8_t*)USART_RX_BUF,len,1000); //发送接收到的数据
; G$ Z" x5 P! ]$ v2 q% L0 J - while(__HAL_UART_GET_FLAG(&UART1_Handler,UART_FLAG_TC)!=SET); //等待发送结束9 I( z. @$ H! `0 b7 Q5 [
- printf("\r\n\r\n");//插入换行5 x. I0 s& r5 j" ~5 z; _
- USART_RX_STA=0;
( Q* s$ B- O7 K - }else; z# g+ n( q9 M9 F% ^6 }' w+ }* j
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- times++;
' g3 {! k# v- j' ` - if(times%5000==0)5 w' @% Y% R/ a4 i- e5 t+ H- Y
- {
5 D8 m5 y; o t9 b1 D - printf("\r\nSTM32F417_COREBOARD 串口实验\r\n");
* ]/ c j6 G4 R W - printf("胤幻1988@ST中文论坛\r\n\r\n\r\n");% b- L4 {3 z; W0 [
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- if(times%200==0){printf("请输入数据,以回车键结束\r\n"); }
* k/ ?! O, ]9 I$ j6 @ - if(times%30==0)LED0=!LED0;//闪烁LED,提示系统正在运行.# i' `3 i8 b% _
- delay_ms(10);
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5 }& j, p, A( C( ~0 i* [ - /* USER CODE END WHILE */
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( z3 C# ~7 A5 M" ^0 L4 s: O- /* USER CODE BEGIN 3 */1 v: d3 Q+ r: N8 D
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- /* USER CODE END 3 */" [. H" _9 Z* h
- }
复制代码 下载后,串口响应:
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, q- k" @, { J+ a5 l4 F$ N7 y好了,模板就到这了~( Z0 t3 g& k: D6 N' x6 P2 P. @4 z
代码:
STM32U585AI_DEMO.rar
(14.94 MB, 下载次数: 5)
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