步骤如下所示:
. ^9 B* o4 R8 ?% L: u步骤一:使能串口时钟及GPIO端口时钟
9 x! s" J/ a: H; X$ D. m) ^: U# B& u步骤二:GPIO端口模式设置,设置串口对应的引脚为复用功能
) T6 p- S2 E" L+ r- g1 u步骤三:初始化串口参数,包含波特率、字长、奇偶校验等参数
& n, b7 `6 s0 R" [2 w步骤四:使能串口
1 `+ R5 b9 d/ p% i( C步骤五:设置串口中断类型并使能
; @% ~" l1 j" l$ \9 C7 W步骤六:设置串口中断优先级,使能串口中断通道 |) P# s" n3 u# O, ^* t0 F
步骤七:编写串口中断服务函数
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9 [9 n4 V- X/ z9 P. v9 Y- #include "sys.h". u; O# G! h8 O j3 O/ q
- #include "usart.h"
! v" ]7 O7 e1 y* Z6 L; A# ~- Q/ w - //
# h# ?% }: B$ C9 `4 } - //如果使用ucos,则包括下面的头文件即可.) @7 R* W8 j$ n' y0 g
- #if SYSTEM_SUPPORT_UCOS
/ t" y. R. j, |; M9 i - #include "includes.h" //ucos 使用 # ~' y/ F9 k, K( i! R# P; G
- #endif P- j! w3 W7 Z C2 f( F9 n3 h
-
$ c1 z; v. r3 `1 j" p1 m
2 e9 k1 _9 a, R8 M. j, A3 L) M- unsigned char ucRxFinish=0;* G4 P. N7 ? T
- static unsigned char ucCnt=0,ucLen=0;6 E; ]' p7 L$ w5 \
- unsigned char ucRxData[100];$ p) w* z5 M" r% l0 d
% p' b( W" Y: v8 ?6 T1 \- //
/ a, r6 ^. q4 u; o: z# s+ J2 W( c - //加入以下代码,支持printf函数,而不需要选择use MicroLIB & ^! K$ J9 E% O7 t2 z) M
- #if 1
7 n: f9 h& k5 D: U6 q e - #pragma import(__use_no_semihosting)
9 k a5 A7 e# f3 r- q - //标准库需要的支持函数
# l* o' l" v1 H" f+ E8 G0 V - struct __FILE
7 [; B2 t5 g( c - { $ N: F! b# q7 J! v* g* d
- int handle; # Q7 j/ ?/ {% n N M% m1 q- q, L
- d7 _7 I! z2 v: R8 x
- };
* w5 W1 E& S+ m( j/ Z l v9 D
- h4 {/ b" g8 {5 R# [- FILE __stdout;
- ^8 @9 d6 O7 _: T/ T - //定义_sys_exit()以避免使用半主机模式
& ^' l6 _# N, p7 x/ `! w2 @; ~+ \3 z - _sys_exit(int x) * F8 D Z- b2 [
- { - H3 }. {& \2 I( b1 u) b
- x = x;
: v' ? L/ z) r2 z w - }
; X& @6 f- f; Y8 G - //重定义fputc函数
' j7 g/ G& Q+ @6 d( H: T - int fputc(int ch, FILE *f)' m5 W5 H5 D3 J. i4 m) { Q0 l
- {
4 C, H8 P C9 I: ^ - while((USART1->SR&0X40)==0);//循环发送,直到发送完毕 / Z1 T& ^4 d. Y+ q8 e3 M5 r
- USART1->DR = (u8) ch; 1 V3 ?0 E3 p1 S) Q' A
- return ch;/ ?+ a7 o& ]& T E! q4 O9 C: E! {$ ^
- }
5 Y* t0 A( ~+ N- c5 R& |" v - #endif 8 B8 p2 F* A5 R" w
* B- c2 H% N3 i, t" c4 @9 l& q- /*使用microLib的方法*/
, y6 Q: Z* r5 o. d' o4 F - /*
7 f. y7 U# L' `' E6 I" m - int fputc(int ch, FILE *f)
/ T K* K. }0 a/ i% a$ Y) h - {& h9 F/ N1 {; d- A1 S, u
- USART_SendData(USART1, (uint8_t) ch);
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- while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}
2 @! t; ?2 x1 X$ ]0 }" h6 D2 x7 o -
1 z+ e2 S [& p3 ~$ n" h2 K. x - return ch;& N. t. F& d2 ~! V) B
- }3 \ r$ L3 g1 `& e1 p
- int GetKey (void) {
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- while (!(USART1->SR & USART_FLAG_RXNE));
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- return ((int)(USART1->DR & 0x1FF));
5 m }/ G! d( A" V+ v4 | - }
# `* G0 l! C3 G5 t6 M! x* ` - */
9 @; e0 x) B/ C$ c& ? - - V2 ?* m- G6 g$ R# `2 ]
- #if EN_USART1_RX //如果使能了接收
1 L* p( k* q3 I; U% V% w% H - //串口1中断服务程序
' ?9 d; A( a- P e# o7 a - //注意,读取USARTx->SR能避免莫名其妙的错误 7 f/ \, j" ?! s$ r* F( A/ p
- u8 USART_RX_BUF[USART_REC_LEN]; //接收缓冲,最大USART_REC_LEN个字节.
$ U9 L1 a, b( R# F4 c1 C - //接收状态
( X F. f1 Q v3 k - //bit15, 接收完成标志
0 E4 N9 g |+ f1 H. K - //bit14, 接收到0x0d
4 o/ s% ~& W W; a, ?2 c* u - //bit13~0, 接收到的有效字节数目; I4 W: L- b9 K0 G- |% y
- u16 USART_RX_STA=0; //接收状态标记 ( \# I) e7 L1 n
- " m- [. o3 e1 I2 w
- void uart_init(u32 bound)
j: J# {: x+ H* T z1 { - {
+ X9 w# e" E, _8 y8 Q+ M - //GPIO端口设置# P) o. A# T( d1 {7 p/ W9 X
- GPIO_InitTypeDef GPIO_InitStructure; s' ~' L! N7 K% a1 f
- USART_InitTypeDef USART_InitStructure;9 i9 p4 Z( w; O n) _0 w
- NVIC_InitTypeDef NVIC_InitStructure; y1 w. Z* r0 x5 h, s& [$ a
- V u; d, y" l7 @/ J5 `
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1,GPIOA时钟
, k4 u6 t" c! k/ }( q% o8 x - //USART1_TX PA.9
4 h4 y& h. Z7 {$ b% ` - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
9 @8 N7 x; v* v0 ~7 P - GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;0 Z& t3 O r) I) S
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
$ l: M3 A7 |' G9 i6 A- l+ ] - GPIO_Init(GPIOA, &GPIO_InitStructure);
- z- d: n0 j6 F2 K$ w - " f Q! ^, _( |/ ]6 [, \
- //USART1_RX PA.10$ a5 B( c- E p9 Y2 {2 x( A
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
1 P9 U+ u: J) X" X* T - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入: [6 @6 [, H; N7 g0 B m
- GPIO_Init(GPIOA, &GPIO_InitStructure); , J) h. y% P$ k+ M, E
- - k1 p2 {, Y7 M& L
- //Usart1 NVIC 配置
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- NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;, C3 d0 L* T5 J( {0 r) J/ W
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
4 {3 f( Q* K) t- n5 O, r) W& L - NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
1 v' T3 V% K& \5 D - NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能0 W6 C0 u2 b4 T
- NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
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- //USART 初始化设置3 Q5 P, k' P# X/ k+ P2 Q. Z! A
5 J" o& C, Q; i1 {- USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;
' C+ `7 r5 H3 e; V - USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
t; {5 `! J2 P% d M+ B - USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
3 u4 G, q; V$ g7 ]/ e# ^ - USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位( Q$ e% G. H2 r
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制6 l* S5 R( F+ g/ {& U- ` A
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
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' X S! ?7 h: @$ U- USART_Init(USART1, &USART_InitStructure); //初始化串口8 M# S* t$ t* J; {& ]8 z9 `$ W D
- USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启中断
# ^' N: Z' @, M7 m* _. H - USART_Cmd(USART1, ENABLE); //使能串口
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$ e& L6 K8 O3 T1 I# R* B- void USART1_IRQHandler(void) //串口1中断服务程序
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0 J$ H. w8 I. O7 [7 m - u8 Res;5 { ]! x, K; s9 |6 e( O, y
- #ifdef OS_TICKS_PER_SEC //如果时钟节拍数定义了,说明要使用ucosII了.
5 \. g2 j1 v; s' |* n6 C - OSIntEnter(); 9 B* t. {1 B7 L9 X9 N4 ^& V7 C* W
- #endif) e& `. H. ?% Z0 J3 ]. H
- if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾)
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- Res =USART_ReceiveData(USART1);//(USART1->DR); //读取接收到的数据, ]; _. a4 \4 Y; `, K; }. o& Y
- ( W. ?8 z4 @8 v& |% b/ v
- if((USART_RX_STA&0x8000)==0)//接收未完成
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% Z3 ~: d' O5 _ - if(USART_RX_STA&0x4000)//接收到了0x0d
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- if(Res!=0x0a)USART_RX_STA=0;//接收错误,重新开始# S3 C, q- p7 @. W" W/ m: V
- else USART_RX_STA|=0x8000; //接收完成了 //bit31表明是否接收到0x0a(\n)2 V' P! w! c+ X5 @7 N2 M$ W" ~8 U8 [( W
- }0 k& V, |& l! ?* V1 h0 |4 k$ p0 b+ d
- else //还没收到0X0D" g% m# N1 K& L2 h8 |
- {
$ O% P# Y8 Z' h. P. ^ - if(Res==0x0d)USART_RX_STA|=0x4000; //bit30表明是否接收到0x0d(\r)7 Z: k% U+ ]% g" U \/ J
- else
' x/ A% j+ {! I7 O7 m. d* g! p - {6 t7 `0 v. r F5 E2 Q1 P
- USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
: w7 S1 [6 k0 G& Q% m; G2 E( O - USART_RX_STA++;; h- O! t9 Q. Z4 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
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- }
7 s$ Y/ B7 k- F9 F) Q2 J - }
# j8 R% O2 S/ x, B; t2 V - #ifdef OS_TICKS_PER_SEC //如果时钟节拍数定义了,说明要使用ucosII了.
* ~! |$ W. R+ T j5 H0 ^6 _; C - OSIntExit(); . l( `0 I0 _; r0 v' a% T5 f
- #endif
2 b. W4 a l- y - }
0 e, B0 p% _2 r" |6 s2 `, s - #endif : A7 v, a& l S a& G( Z' Z
- + w1 _: X. ]8 n% k! h6 q3 ~* p
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- void USART2_Init(u32 bound){+ _# {6 m1 ?: j* J
- //GPIO端口设置
1 W$ t; {6 _9 C1 Y* i- ` - GPIO_InitTypeDef GPIO_InitStructure;3 ?" n7 e+ D5 _* p" j! @+ t
- USART_InitTypeDef USART_InitStructure;
$ m& ]+ t- }5 S+ v1 z8 u( V3 E' u - NVIC_InitTypeDef NVIC_InitStructure;8 m0 v1 C; n7 i; H
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);5 j/ c% l0 V* {1 |
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能USART2,GPIOA时钟
# C- |6 B# a" C m8 |' E/ w - USART_DeInit(USART2); //复位串口2/ w$ F& B- I& i
- //USART2_TX PA.2, e' U9 H2 |3 t) @
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.9
4 q2 G8 D$ q) Z2 l" n9 Q M2 P - GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
! a: v' u7 `8 p/ R# Z; o - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出/ y7 x' d* K0 x& L2 w
- GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA9
7 ` |0 C/ P( s6 Z) r - : a. P! k1 j! a
- //USART2_RX PA.3
9 N! c$ K+ e" A/ P" [ - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;$ g' w5 @% }4 ?; |* |1 i
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;//浮空输入
, _. G+ j3 @2 t - GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA10
1 Q5 _6 e6 Q6 s: q) p3 M2 {# V
0 t- i0 d: C7 P3 }- //Usart2 NVIC 配置$ q& I+ \9 R- N
- - n4 {4 e* `, E
- NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;% g! O% N$ B' M! }- J
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级35 l; E+ {3 `6 |# I
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4; //子优先级38 P) {, z( b2 A
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能& }8 e" h! a6 B! M& e
- NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器$ c, E6 B( ]0 N# U
- 5 D; z* X: ~4 C. y) o0 q( Y; j, n
- //USART 初始化设置+ u6 [: K" ?" d
- USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;
- W# t$ n3 u! r' W8 n+ v5 E3 e - USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式( K; q' P( s n/ p, @4 C E9 `; V+ b
- USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
6 a9 v a# P: F. N$ ? - USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位# Y* g1 g) z; w0 D: Y; E: U/ B% R) I4 H
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制. Y3 `, D2 y. L8 U
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
8 y9 a; S( U) k- ^( d' j - " ] V( W& n' o4 D
- USART_Init(USART2, &USART_InitStructure); //初始化串口3 i3 Z7 n+ p: E: I. P8 I/ x& }1 I
- USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断' w7 ~6 J( h& e. A: K6 x e" x; a
- USART_Cmd(USART2, ENABLE); //使能串口 ! d2 K% M# }0 x% ?6 |* V
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" H! G+ k2 s' [' R" ?- void USART2_IRQHandler(void) //串口1中断服务程序4 _! O, _6 l- K8 ~0 u' _' ^( v
- {( M1 E# p$ ^! p, U$ u0 {) G
- unsigned char temp=0;# K8 x( B# {/ o/ s* i
- u16 C=0; X. r# k/ F2 M3 {& F
- 0 z& c8 P& X+ ~
- // if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) 5 j5 j; e+ Q6 q
- // { Q% }. x( b' R7 d% ?
- // temp=USART_ReceiveData(USART2);
) s' f, t. v! a: o$ T - //
( H: @6 S2 `8 O1 N4 \. J - // if(ucCnt==0)
7 B3 ?8 a7 S7 ^, m+ r - // ucRxData[ucCnt++]=temp;+ C1 J, P& Q( X l
- // else if((ucCnt==1)&(temp==0x03))
. @. N) V4 o4 J - // ucRxData[ucCnt++]=temp;' k" U( T. t+ N3 _1 |1 @8 m
- // else if(ucCnt==2)# ]) c; g' a, i; g
- // {ucRxData[ucCnt++]=temp; ucLen=ucRxData[2];}
/ J$ l! N. \- U( G: O. X3 m0 h - // else if((ucCnt>2)&(ucCnt<=(ucLen+4)))* B/ g* L; M6 f9 \
- // ucRxData[ucCnt++]=temp;4 C# y( ?4 B+ x% {) I
- // if(ucCnt==(ucLen+5)); e9 ?% @& ~7 I% [& x4 n
- // { C=ModbusCRC(ucRxData,ucLen+3);3 v$ a0 g' @$ g' X
- // if(C==((ucRxData[ucLen+3]<<8)|ucRxData[ucLen+4]))) m$ O# `: d4 n
- // {ucRxFinish=1; ucCnt=0;ucLen=0;} ' L0 u# _, L; t
- // else
) Q8 w, I9 w% M0 f% [ - // {ucCnt=0;ucLen=0;}
* ^+ K( \, Y% R0 }( u - // }
4 G$ u9 ~& P; W) \+ _8 B: d - //
5 u- D( u* v6 p* Z9 _ - // }
) W# ^& m- L: m3 j" g) w% w, ~ - USART_ClearITPendingBit(USART2, USART_IT_RXNE);
( @+ [1 v: F0 W+ F - }
% D# Z1 \* K, o- [, O -
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- # g6 r2 D9 v. ~7 d$ v) g
- void USART2_Send(unsigned char *data,uint8_t ucLen)
5 g& i/ R5 q/ q0 O; t - {: V9 n0 n. T P# K2 h, G
- uint8_t i;
3 Y% j2 b3 p. W - USART_ClearFlag(USART2,USART_FLAG_TC);
1 M6 S* b6 Y! C7 ^9 m& E - for(i=0;i<ucLen;i++)
2 o$ |% p, Z1 Y - {6 e! O" {' Z' q) k# l2 n5 M
- USART_SendData(USART2,*(data+i));; c8 ]- |9 W2 @8 O& W( G: P r% F
- while(USART_GetFlagStatus(USART2,USART_FLAG_TC) == RESET);
p' [. a4 R3 V1 K+ }6 @ - }
# `1 @$ |! ?( z$ e6 T' d) L - }
- l: _% h2 Q6 h3 M
: T0 |1 l! Y l- uint16_t ModbusCRC(uint8_t *ptr,uint16_t ucLen)//CRC校验# Y7 p3 Q [- A7 @: e9 r
- {1 ?9 _- ^+ n) i/ @9 z" {( {" a4 y2 _
- uint8_t i;1 {) d' C3 t$ o# j+ r
- uint16_t j,crc=0xffff;' d0 M* }8 N0 w7 G: Y
- uint16_t n;' ?) @- w" @. j4 q+ l
- i=i;
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- for(n=0;n<ucLen;n++)8 G$ ]! b* p4 F6 q l+ ^7 Q
- {
) c# R! m# \' e" c8 C# T( X - crc=ptr[n]^crc;
! K! B# d0 t- j0 U: l5 a% v - for(i=0;i<8;i++)
" E" P# ~( E G( j# S( c) ~ - if(crc&0x01)
! _9 x" k% W1 D8 Y V# z - {4 F3 f6 T6 ~* S0 U1 h8 F
- crc=crc>>1;2 \$ _; B9 \6 a6 K2 [
- crc=crc^0xa001;
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T5 U+ T) }1 U7 ] - else# i# M$ ?, B* i8 @+ E
- {7 n; I0 S! m/ _* v+ F) v
- crc=crc>>1;
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- }0 P+ e3 q. O# P* e. H
9 O; H* g6 ^* i- j=crc>>8;
4 z/ I6 W4 S. S+ M0 R0 h - j=j|(crc<<8);7 Z1 f: L' ]+ O- A+ t( P; m
- return j;7 c. o# W$ t# d1 O0 V# c9 f
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- 3 J, N/ U6 B' {. [5 M) E
- void usart3_init(u32 bound) //串口初始化函数
' }! {) y% t/ K q - {
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' L! v3 e5 a2 ~, m# g1 H9 u- GPIO_InitTypeDef GPIO_InitStructure;
5 \: }" [, n. z - USART_InitTypeDef USART_InitStructure;
5 q4 Z, N: u, I V( S9 L/ ?" o - NVIC_InitTypeDef NVIC_InitStructure;7 S9 r: M9 O* S) s
- // 串口时钟使能
- n2 I- y- k6 y9 T - RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); // GPIOB时钟3 H9 Z" u9 M& f$ T( ~. L! |7 p
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //串口3时钟使能
( z r# G# T8 i" z* R; {( p" k: c - //串口复位
n5 w) e- @* O, E! d0 h - USART_DeInit(USART3); //复位串口3
' g3 N6 [7 Z( ~8 X9 D3 ? b/ s- L- O - //USART3_TX GPIOB10: t( z4 G3 A& T8 e7 A' p: q
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PB10- j* |8 W2 p) P% M; J. N
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;0 M, r) M O$ a4 x9 @9 x- d( i
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出" P# f' i: f; P$ U
- GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB
# F# }, g4 X3 O" x( P - //USART3_RX GPIOB11
- g2 T* `4 u# V$ u; c - GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //PB11
5 g0 J9 O6 Z5 k e - GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
/ d: c8 e4 S: B- I- t: g5 w: b" s z - GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB
: [" f1 w J$ R& B - //USART 初始化设置; {) a( X6 P$ w$ [
- USART_InitStructure.USART_BaudRate = bound;//串口波特率
- o+ P- y ?: H! S% ?9 u - USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
2 g. ]' @0 ]/ C( c1 K' P1 k/ k - USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
. _2 e7 F% y- z, d% r6 j" q - USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位/ s0 y& Z3 |! y" p% A& A- s2 {+ [
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
0 l2 i/ Y) `7 l - USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式1 q( M4 U$ t- {3 i4 y8 y7 |
- USART_Init(USART3, &USART_InitStructure); //初始化串口3
: X) {, c( U8 K/ \ - //Usart3 NVIC 配置
0 \# O) c* M6 B- p - NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; //串口3的中断
) j2 c0 J$ v3 |- p7 L - NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3/ ~& r) C% J. n
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3' s) x2 B" z( B( Q
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
& Q9 u! Z7 v3 J4 H: M - NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器0 V0 Y! _' S1 L. p; r
- //开启中断
5 O; d+ g3 x( j; S# K9 A' z - USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启串口接受中断
3 B- D& f; }9 N- e5 A& e - //使能串口
7 D/ U2 t( V: p5 H3 K - USART_Cmd(USART3, ENABLE); //使能串口3 , i( D- u6 p/ `# J
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- void USART3_IRQHandler(void) //串口3中断服务程序 U8 B: i5 c( Q& m4 z1 a' I8 e
- {
) L2 |8 h+ e Q, z7 m4 \% _( q - u8 ReceiveData ;
D3 H+ @$ W; t t/ s4 U% e9 E: k - if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) //接收中断5 Q* j6 Y& n0 v2 u/ t
- {
5 M0 @# f/ c: s/ e; ]- e4 \) _" d0 Z - ReceiveData =USART_ReceiveData(USART3); //读取接收到的数据5 q! S( ~/ t7 y, ]" U
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- }
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% d u" |5 i c: M9 W( I1 Z4 H# t - $ z0 p( j2 P4 t) y( C
复制代码- int main(void)
: s/ [/ \0 U/ p# q - {
8 T( r {3 Z1 \6 A5 S/ s - uint16_t c=14;
! k. z9 D- O" A, F; e0 v - // Init_HX711pin();
5 |7 q. `; o1 R( `# ` - delay_init();
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- NVIC_Configuration(); //设置NVIC中断分组2:2位抢占优先级,2位响应优先级: @4 D% V$ ` g# _0 H
- // NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
, E( @3 j# w, H6 _! G' j - uart_init(9600); //串口初始化/ ^' \. V0 ?/ H( c7 J* |- Y8 k/ C
- USART2_Init(9600);8 b( Z8 [: o. s- g3 m$ l
- usart3_init(9600); //波特率设置为96003 q: ?/ J# R: a. c0 M' p. w Y
- // Get_Maopi(); //称毛皮重量
8 \: N0 q% H4 u V4 U7 y) k. n - delay_ms(1000);4 E) ?0 M1 {# p, y+ u# m& J$ v/ n
- delay_ms(1000);: [7 w- a$ ?1 h7 S- Y
- // Get_Maopi(); //重新获取毛皮重量; ~9 r0 T" w; t' f
- " e5 H: O/ g& f1 F, @' Z
- while(1)* [* C, Q- S3 G/ q. D
- {
4 Z# J/ h3 q. }- b A4 d& F7 @ - // Get_Weight();
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; ~, p( b/ K9 n a1 m- // printf("净重量 = %d g\r\n",Weight_Shiwu); //打印
: ?" {: l0 z" C - // delay_ms(1000);
1 `+ B. J I+ c7 l$ U3 Z, W$ `7 _ - // : U( q0 z9 [$ I$ g, h
- USART2_Send("9999",4);
3 G' F0 ^3 L- f - delay_ms(1000);
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- USART_SendData(USART3,68); //串口发送数据6 g6 G/ v! v6 [- a& G8 E/ h
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复制代码 6 t- M3 t4 R3 x8 K5 x6 p
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