一,打开cubemx,配置时钟等参数,具体操作方法和上一节一样
3 ]; s8 B* p: |. F二,配置串口1
3 V1 N% k3 I5 T8 m在cubemx上打开串口1,并设置波特率,其他参数保持默认,配置完成如下图所示:
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9 m1 T2 c2 h: c* K" z0 S1 d% P三,打开串口中断
- M% @: C% T$ x8 |# J! E! W点击NVIC SETTING,勾选相应选项如下图 `5 U3 T" a) L& m) B
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! U5 |+ J: a% J; P) i四、生成代码,具体方法与上节一样
2 q" v" Q3 b) F5 | J1、在usart.c中添加如下代码:0 i/ r" p, |; @: [
, \4 s/ V5 l# }4 x- uint8_t aRecBuff[1];9 M- i9 I6 B! X% P
- uint8_t Uart1Buff[REC_LEN];* |+ Q' K. \" F( u! V
- uint16_t USART_RX_STA=0; ' \& P I" j% L, F+ s
- int fputc(int ch, FILE *f)//printf的重映射+ J6 Z7 \$ l0 A) O2 q8 ?
- {
. ]- x/ z, L# v6 W, v- q - HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
" t0 |# \* F Z/ }* Z9 N5 ] - return ch;3 P* r3 f+ E" u4 t4 @& N4 v# h
- }
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2、 添加中断回调函数(参考正点原子函数接收方法)
% L' X; s! v; t7 i- void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
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1 T2 o1 D# L8 X6 l3 q2 G2 E - if(huart->Instance == USART1), T" w6 H3 B U2 x
- {
0 X1 O6 }$ }: y+ G - if((USART_RX_STA&0x8000)==0)//接收未完成6 ^% [$ Z# C2 b6 [& f
- {
0 E7 Q4 i- x8 J4 X& O5 I - if(USART_RX_STA&0x4000)//接收到了0x0d L' ?3 U# R+ s: f
- {
1 v* y0 a8 |% |" Q) O - if(aRecBuff[0]!=0x0a)USART_RX_STA=0;//接收错误,重新开始
* B: a7 K* W% y% n% D - else USART_RX_STA|=0x8000; //接收完成了 . \6 I# z C% }5 X) T0 c$ t1 B
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- else //还没收到0X0D
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& F, j& R8 ~: V5 ~$ o0 d - if(aRecBuff[0]==0x0d)USART_RX_STA|=0x4000; M, U/ I3 [9 W) A; Z1 ~
- else
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- Uart1Buff[USART_RX_STA&0X3FFF]=aRecBuff[0] ;9 x* c8 `) ?2 W
- USART_RX_STA++;2 F) x$ U$ P2 [1 [* N
- if(USART_RX_STA>(REC_LEN-1))USART_RX_STA=0;//接收数据错误,重新开始接收
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- }
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- }
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$ p+ @1 c6 S# w; J$ u+ s3、在stm32f7xx_it.c文件中的void USART1_IRQHandler(void)函数中添加如下代码,以保证进入串口中断后再次开启接收中断,添加完成的代码如下:
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, x" z" ^9 g, V) y5 z! P- void USART1_IRQHandler(void), E7 ^9 ~- u/ u; N9 _; {3 D8 V
- {
& T8 a4 O6 C; I9 F& \$ |' a' P - /* USER CODE BEGIN USART1_IRQn 0 */
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1 v4 H$ I5 B4 m- /* USER CODE END USART1_IRQn 0 */
) @* v: z( G7 ?5 i Q5 e' n - HAL_UART_IRQHandler(&huart1);: y; t3 `/ d N& e8 I( H
- /* USER CODE BEGIN USART1_IRQn 1 */
9 t7 }( X }5 k% U& R# k! ]0 K - HAL_UART_Receive_IT(&huart1,aRecBuff,1);
$ z4 S. y3 H: E: R - /* USER CODE END USART1_IRQn 1 */
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3 g8 A: _5 u& V/ b4、在主函数中添加代码开启串口接收中断
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- HAL_UART_Receive_IT(&huart1,aRecBuff,1);
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2 ~2 v$ d5 @# |) V! Y+ I# f5、在主循环添加代码,串口接收完成后,打印接收的内容(注;串口发送的内容需以换行符结尾),更改完成的主函数如下所示:, [2 W6 V I0 x; F' A$ _ O
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- int main(void)! ]. o; `( z6 d9 g1 w# n
- {
- Z9 D8 n3 M; K5 Q3 Y- ` - /* USER CODE BEGIN 1 */
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8 v/ O3 h& K' j9 U* n2 I5 K- /* USER CODE END 1 */
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! ~2 c4 C5 S& U! O+ r6 J- /* Enable I-Cache---------------------------------------------------------*/
( e6 M9 V9 {6 N* a- j; {2 y& |2 G - SCB_EnableICache();
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5 }, ~$ _8 F5 j" n/ y- /* Enable D-Cache---------------------------------------------------------*/
6 H9 j# Q" i9 G - SCB_EnableDCache();# X' w. C1 c4 B5 n1 @. V' x6 V
- 0 G! g0 t6 D$ t: w
- /* MCU Configuration--------------------------------------------------------*/
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- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */7 m' p Z$ ?8 b0 N7 V. Z6 ^, ^3 k
- HAL_Init();
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- /* USER CODE BEGIN Init */
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- /* USER CODE END Init */
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6 ?# h! a. n+ H/ ^3 p/ r) q0 ]- /* Configure the system clock */6 w2 ?/ {8 X" W* k! c
- SystemClock_Config();
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- /* USER CODE BEGIN SysInit */
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- /* USER CODE END SysInit */
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& y) F. p+ F2 K$ | g/ F- /* Initialize all configured peripherals */
3 ~- R' F( P! J* @: Z: W& R - MX_GPIO_Init();
5 E5 B7 s" a } - MX_USART1_UART_Init();
) a5 i) _8 ^% B. R. _; H. | - /* USER CODE BEGIN 2 */" z8 W4 U. U7 {, t$ J' B
- HAL_UART_Receive_IT(&huart1,aRecBuff,1);
. R" T7 o2 T# a# s& n. W - printf("uart test is run!!!\r\n");; B5 h- V) M: { d7 I( X6 d
- /* USER CODE END 2 */
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- /* Infinite loop */ z" o" z( x% f! L1 m* S* z2 M- @
- /* USER CODE BEGIN WHILE */; a7 F! h+ V8 x2 L9 D/ [
- while (1)
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! g( y3 J! V9 E# L4 p7 h - /* USER CODE END WHILE */# W0 k+ o2 j, V) n4 w4 |
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- /* USER CODE BEGIN 3 */6 S/ s2 l3 ?; K0 i1 Q9 i* z
- if(USART_RX_STA&0x8000)
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+ H" @+ u6 I& v6 u5 C5 H8 c k - printf("recdata is :%s\r\n",Uart1Buff);
; Q* M7 J- x+ n% f, h - USART_RX_STA=0;+ k0 F/ e1 g" U/ q9 D5 O& a/ F
- memset(Uart1Buff,0,REC_LEN);+ F+ D; g% z3 w A% @5 y1 ?
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- /* USER CODE END 3 */
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) ?2 M0 ?! S! C& G如果编译memset出错,则添加string.h头文件即可。
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8 \( ~) d& F# Y# Q7 o五,编译下载,打开串口调试助手观察现象: D: M# F/ h. g8 e
开机系统打印uart test is run!!!,向串口发送“这是一个串口实验”,则在串口就会显示“recdata is :这是一个串口实验"注:发送新行需要勾选)& _( `! ]5 [: u+ @# s4 }
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