首先,总结全文,设计步骤主要如下:) T9 r1 h# m+ E# h0 Y/ T
1,初始化GPIO( @& q# U# @1 V! G0 v1 @) t5 p
2,初始化USART18 w y4 c$ Q) J2 a: `6 C; D+ z' @
3,初始化NVIC(嵌套向量中断控制器)) u* J6 @- B, I- j6 E: `% }
4,编写中断服务函数
& t, ~- Y! |/ b0 d0 j8 B! K5,编写主函数. T7 f6 l: V. z/ X$ F
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详细步骤如下:; E& g. e' a* {( v. B
' ~& H5 B3 h. C, e! w1,初始化GPIO
2 P8 B* J# M- I- void IO_Init()
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- GPIO_InitTypeDef Uart_A;* u- H) A T4 c7 |2 ]
- GPIO_InitTypeDef led;- w u- N0 N' d
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC| RCC_APB2Periph_AFIO,ENABLE);( e0 M- l8 J4 I% s' W
-
% E& H5 A% c7 i* ] E. }( B% Y - GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable|GPIO_Remap_SWJ_JTAGDisable,ENABLE);, n" C# H S8 C7 h6 u+ E
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- led.GPIO_Pin = GPIO_Pin_13;//博主开发板上的LED灯接的GPIOC的13引脚# `9 c) O& K7 ^" E
- led.GPIO_Mode = GPIO_Mode_Out_PP;' u! G$ Z8 G- w/ g) c& V
- led.GPIO_Speed = GPIO_Speed_50MHz;
7 Z. z! ]. w0 W0 y# i, }* w2 E - GPIO_Init(GPIOC,&led);9 \6 f, W$ T, Q1 l/ Z
- : Y+ c, t: @3 |, i0 b/ J8 n
- Uart_A.GPIO_Pin = GPIO_Pin_9;
9 V4 Y/ U2 i. s7 M% x# }, ^; Y - Uart_A.GPIO_Speed = GPIO_Speed_50MHz;
* i: R1 v+ W- h( _ - Uart_A.GPIO_Mode = GPIO_Mode_AF_PP;) Y, u5 F1 C& h
- GPIO_Init(GPIOA,&Uart_A);
# A& ?& P% K5 W2 ] - + s, D% y+ U( R& c0 {
- Uart_A.GPIO_Pin = GPIO_Pin_10;7 m! c0 P/ g) }
- Uart_A.GPIO_Speed = GPIO_Speed_50MHz;
3 n9 V- \8 _$ T# b; l - Uart_A.GPIO_Mode = GPIO_Mode_IN_FLOATING; ) y1 h7 C3 Q( q% G: j, q
- GPIO_Init(GPIOA,&Uart_A);
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, N3 y* m, M# b( i& A0 ]8 W9 Z - }
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( h6 h- p3 p$ Z) E以上代码不在详细介绍,前参看STM32基础设计(1)---点亮LED灯、SEM32基础设计(2)---查询串口通信
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$ @1 d7 b; N& g5 C! `: `5 e8 q2 ~9 y2,初始化USART16 y4 y! [8 g3 z3 y$ d" o" j) P
- void Usart1_Init()
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- USART_InitTypeDef Uart;
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3 H, I. B9 c- p" Q' M) N. b - RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
- s" J) \( Q( _6 ^. J+ L - Uart.USART_BaudRate = 115200;
9 k/ c8 T" @0 h' S" y - Uart.USART_HardwareFlowControl = USART_HardwareFlowControl_None;3 s7 H [- }, i
- Uart.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;" s( @) c$ Y( [$ L: g0 |& Y
- Uart.USART_Parity = USART_Parity_No;
' X/ i$ ]3 p8 n# b - Uart.USART_StopBits = USART_StopBits_1;
2 v9 f) w% M) V9 X - Uart.USART_WordLength = USART_WordLength_8b;" t; v) ]0 ]3 |& j, d5 u
- USART_Init(USART1,&Uart);
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* b! Z) ~3 o9 y+ _ - USART_Cmd(USART1,ENABLE);) O& r, f" s0 [; W% ]/ |$ C9 C
- USART_ClearFlag(USART1,USART_FLAG_TC); 0 x" L) x; y6 G- ]8 z v' G
- }
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. M0 `( L: n$ o( g7 T- u6 V以上代码不在详细介绍,具体请参看STM32基础设计(2)---查询串口通信
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: n. w8 \3 N, F1 F8 W2 Q/ a3,初始化NVIC
9 p; s* o$ p* D+ z2 l* o首先,让我们来了解库函数中的NVIC结构体:
( V, H: _/ B2 ^& E" k r- typedef struct7 M3 w. D* V! C( _+ |/ G& n. c
- {//指明那个中断通道 b/ ^: U) _3 r# o% ~
- uint8_t NVIC_IRQChannel; /*!< Specifies the IRQ channel to be enabled or disabled.
8 U' W8 L! R8 y2 I, g9 M - This parameter can be a value of @ref IRQn_Type : n7 d' ], n! X3 ~
- (For the complete STM32 Devices IRQ Channels list, please
( A G0 e, D5 L - refer to stm32f10x.h file) */
+ s1 h' O1 e& u4 H - //抢占优先级
" [ r2 d/ \! A! ]7 ^ - uint8_t NVIC_IRQChannelPreemptionPriority; /*!< Specifies the pre-emption priority for the IRQ channel
0 ?9 K+ b6 E8 Y' k2 ]: Q* } - specified in NVIC_IRQChannel. This parameter can be a value
& b0 y0 s/ w2 M7 S- a& r* e# b% l/ Y& l - between 0 and 15 as described in the table @ref NVIC_Priority_Table */
/ T; Q% F, N3 g3 F, G3 b - //子优先级6 [# J2 V F; X
- uint8_t NVIC_IRQChannelSubPriority; /*!< Specifies the subpriority level for the IRQ channel specified
/ t) F6 X4 U9 e - in NVIC_IRQChannel. This parameter can be a value4 w( {7 n% [) l6 ]! A, h
- between 0 and 15 as described in the table @ref NVIC_Priority_Table */
. w" g- [: q8 N+ e# n- a - //中断通道使能
j6 R3 [8 x& J- Q$ e5 |6 @& n) T - FunctionalState NVIC_IRQChannelCmd; /*!< Specifies whether the IRQ channel defined in NVIC_IRQChannel
1 o/ X" d. J% G2 J; a - will be enabled or disabled. 6 ]( I" a& h$ l& s4 L3 z
- This parameter can be set either to ENABLE or DISABLE */
7 A: W5 w6 |7 f$ y( R+ _0 |! b - } NVIC_InitTypeDef;
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( L% ?3 k, d, u1 R了解了这个结构体后,就可以在初始化函数中定义这个变量了 `- Z( C) L! d+ a, s
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9 Z$ o$ g6 G6 E4 w# k另外在NVIC初始化中还设置优先级分组(哪怕只有一个中断也要分组,这是规定)。具体使用这个库函数:
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- void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup). B1 `) O6 d H. X; }& l
- {
& R0 g# | I" t8 L2 c+ y - /* Check the parameters */
" w; Q; Z( m' V& j4 Z. J* ^6 c - assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));
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d' h7 O' g, g( [/ c6 | - /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
& {% V- Y8 B) {+ o9 e. J; C5 {) ~/ v* h - SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
5 u( Y b5 y. F$ h) v" S b - }
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' f8 E7 E. A) w/ f) F2 h8 ]& k接下来,设置结构体中变量的值:
/ s/ z2 K1 Q2 S# d* l- nvic.NVIC_IRQChannelPreemptionPriority = 1;//抢占优先级9 I( ^0 d* @* N) m7 D
- nvic.NVIC_IRQChannelSubPriority = 0;//子优先级
2 s1 u) J6 B' W ? - nvic.NVIC_IRQChannel = USART1_IRQn;//中断通道
3 r( q. I, f1 Y9 y+ N0 L - nvic.NVIC_IRQChannelCmd = ENABLE;//通道使能2 v) [( I8 Q1 `- |' I# h! f
- NVIC_Init(&nvic);//NVIC寄存器初始化
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4,编写中断服务函数
; F# t7 p8 k* x# L1 T先贴代码,在解释
, L4 e' ?* g+ v- }0 C* s' e/ r% _- void USART1_IRQHandler(void)//注意,这个函数名必须这样写,否则进不了USART1中断。详见库函数中的 IRQn_Type 结构体
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- char temp= '0';
( E- ] a9 P- ~: v7 e - if(USART_GetFlagStatus(USART1,USART_FLAG_RXNE) == SET)//判断是否接收到数据. Y5 S8 m& E. z$ i7 J
- {' B1 N: \4 n* C' F8 u( X
- temp = USART1->DR;//如果接收到数据,就将其读出,这样才可将RXNE寄存器清除9 {, r3 W% z1 K' z2 }) D
- if(temp == 'G')//如果接收到G 则关灯' {* H$ t" {3 e: O. B3 K
- {
: A) P5 X! i* H/ b/ [7 } - GPIOC->BRR = GPIO_Pin_13; d, B, P/ o/ v" U2 q X: E3 K1 \
- }else if(temp == 'K')//开灯
; Q6 b$ }' j- Y- q2 {& d' F$ L, a - {
! @6 j' B! O4 V1 N2 K' k - GPIOC->BSRR = GPIO_Pin_13;
) Z' f4 n, i" R6 z1 J - }
' T+ A5 n5 ^( h' E2 r - }
6 X5 y+ d' A5 ^' H" t1 q - if(USART_GetFlagStatus(USART1,USART_FLAG_TXE) && temp != '0')//如果发送寄存器为空,即可以发送数据! `4 J# ?( U' ~" }& D/ b
- {3 k. {' D3 ^0 W! C
- USART1->DR = temp;将接收到的数据再发送回去
: W3 p8 }, @3 f% P2 b7 I - while(!USART_GetFlagStatus(USART1,USART_FLAG_TC));等待数据发送完毕
4 d2 P; z4 `, J# R3 R - }; b# O9 Q/ p/ ~0 _
- }
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% y& i/ @0 ^# g6 H, [0 S/ w/ s5,编写主函数: [" j8 O0 Y" l: r" ]
老规矩,先贴代码再解释:; l) M! J! `/ ~, F$ A
- int main()1 Z8 p z0 b# i" ~
- {7 {6 r, f9 x+ | j9 y
- IO_Init();
- u" x9 d5 T, P8 T0 W+ G - Usart1_Init();
4 G6 n6 T5 l" M9 b9 P - Nvic_Init();
8 x7 @+ _" O% E$ ~6 ~8 \ - USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);//这里是打开串口的接收中断,以便在USART1收到数据时,进入中断函数。这里特别提一下,现在不用打开发送中断,只有在准备发送数据时才应打开,否则会直接进入中断函数。) f% [1 Y$ A# @/ W
- GPIOC->BSRR = GPIO_Pin_13;4 N; P1 c+ m. m$ Z
- while(1){}
, b& X( X9 O- Z; n( H - }
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额。。。突然发现没什么好解释的。& W: C7 V7 ]- c$ @4 y3 }
! Z: ^& X1 c5 |1 @- N中断串口通信介绍到此完毕。
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' a; F' ~ [1 J本文完整代码如下:: ?3 ?9 ]4 M5 f/ D8 q
- #include<stm32f10x.h>8 r( z [1 c( c' R
- #define uint unsigned int$ G# R& h% ~ y+ n4 M
- #define uchar unsigned char) u1 I9 i' ]7 r) V/ g6 [9 m5 \
- void delay(uint n); T; ?, f* G& ^: ?. h
- {
4 m8 ?& _. d' @6 ^8 ~ - int i,j;, q& M& b1 s/ O' N6 s8 W+ }
- for(i=0;i<n;i++)
4 \$ j2 Z- h* q% l, v - for(j=0;j<8500;j++);$ j- y3 S+ \4 [- A9 c: u, p% @
- }
" M4 ?2 `" m3 L! p4 O' {- n, J -
3 y# o, }4 s# D - void IO_Init()
$ C( v. W1 x+ c% T' n& X - {
+ N3 ?5 R8 f6 s9 }: W - GPIO_InitTypeDef Uart_A;$ X- x+ r0 o( H/ m b9 U0 c+ v
- GPIO_InitTypeDef led;- r( ~ Y7 K$ H, D+ |
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC| RCC_APB2Periph_AFIO,ENABLE);& n" c7 U p0 l6 I
- ) T7 b2 m: _5 [( \" `
- GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable|GPIO_Remap_SWJ_JTAGDisable,ENABLE);* q2 l7 b. S/ \. t) P
- ) S9 ^$ q3 T% `
- led.GPIO_Pin = GPIO_Pin_13;
0 Z6 l# [8 w+ v0 m4 W! | - led.GPIO_Mode = GPIO_Mode_Out_PP;: V+ \; O8 H- H; J- t/ T
- led.GPIO_Speed = GPIO_Speed_50MHz;
/ F: L3 k9 ^' H - GPIO_Init(GPIOC,&led);2 W; b; T$ F* M) t# Y/ u- P/ N! E) m
- ) i7 i6 z9 m: X s* C
- Uart_A.GPIO_Pin = GPIO_Pin_9;! ^1 e( A7 ]7 N; ~/ D' {/ \
- Uart_A.GPIO_Speed = GPIO_Speed_50MHz;+ [9 q4 ^1 W- H# @5 p! R
- Uart_A.GPIO_Mode = GPIO_Mode_AF_PP;) ]! i% K: l p2 r" }4 W3 N
- GPIO_Init(GPIOA,&Uart_A);0 g3 _/ z, Y9 ]5 Y! F P. o
-
# b' e0 H8 m+ }# D: J, v - Uart_A.GPIO_Pin = GPIO_Pin_10;$ p: a# f* N, ]& H
- Uart_A.GPIO_Speed = GPIO_Speed_50MHz;2 N$ o% w& k5 R
- Uart_A.GPIO_Mode = GPIO_Mode_IN_FLOATING; //page 110; C. w/ v& G' G! a; x; I& Q
- GPIO_Init(GPIOA,&Uart_A);0 o# ]& a, p% j( n/ }; g- \$ H
- 6 {+ W; h; b- U6 K- H
- }
2 b; S, x( D D: q: U/ p/ j# ? - void Usart1_Init()4 \6 o" v2 Y% m; m
- {
4 w6 _, x$ k. _7 e' z8 ` - USART_InitTypeDef Uart;5 y: K" i/ ?( v4 q0 J
-
3 t& W8 j# F4 }1 W7 Y - RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
& |7 @6 S7 `4 H9 U - Uart.USART_BaudRate = 115200;
& @* W! h1 l; {' q0 s" K - Uart.USART_HardwareFlowControl = USART_HardwareFlowControl_None;2 s& E" T0 E8 z8 q
- Uart.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;" ?9 [9 c0 H) |1 U3 \
- Uart.USART_Parity = USART_Parity_No;
! J) X" {2 r6 M1 V0 l - Uart.USART_StopBits = USART_StopBits_1;
- l. v2 L- }% n+ C - Uart.USART_WordLength = USART_WordLength_8b;* ?; J, R" ]8 D6 |; l( l; ]: m8 V, ~
- USART_Init(USART1,&Uart);
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- USART_Cmd(USART1,ENABLE);% O: {7 }! k* D5 e2 w, K
- USART_ClearFlag(USART1,USART_FLAG_TC); //page 540# r! F& w# |3 o( b4 j4 |! T
- }
- l) h1 l' _* O4 s - void Nvic_Init()9 J! K9 B+ ?+ b" j
- {
7 C: A! I; W7 Z - NVIC_InitTypeDef nvic;4 ~1 r1 X9 y$ f- K% Q
-
) T1 u) O o. c" c3 @4 d - NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/ P: x- U6 K) K8 R! f3 W% e1 r) ` - ) V; k- E) m- s6 Z Y
- nvic.NVIC_IRQChannelPreemptionPriority = 1;
! X, I* G8 X) r - nvic.NVIC_IRQChannelSubPriority = 0;, j4 d( A4 w( k" N: P# h' _9 V
- nvic.NVIC_IRQChannel = USART1_IRQn;
7 `' P M/ S2 n - nvic.NVIC_IRQChannelCmd = ENABLE;
* X/ X( X3 x! a6 E: u+ _ - NVIC_Init(&nvic);
$ N7 B' t/ W) h - }
% C" ~3 b& p; Y$ \: W) E' P3 Q -
0 ?/ `# m1 A2 ]+ J! _ - int main()- K2 y L1 X; F4 H
- {4 \% l) _- U4 U* @ W1 `$ G
- IO_Init();1 t$ \- B6 L2 h1 {" H* a
- Usart1_Init();* S+ m: F( [7 `$ K9 D1 V* a/ i
- Nvic_Init();
7 F& Q$ l* U4 K6 [ - USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
7 b* A E$ g; y; v, N8 S - GPIOC->BSRR = GPIO_Pin_13;% G1 Z, V8 ]! a. Z7 W
- while(1){}: |9 i4 D+ }- {" \2 ?" o2 v8 L% m; t
- }
7 g: I, ]1 Y4 b2 y: ~+ r: d - 9 k; Q2 Q2 r) H z2 w* y" O# [$ W8 c
- void USART1_IRQHandler(void)
. {7 m, u& m5 k. _8 l# q - {
5 [. K8 z5 H4 S - char temp= '0';6 K7 A; _: [ M4 c+ M
- if(USART_GetFlagStatus(USART1,USART_FLAG_RXNE) == SET)
' p3 h2 B$ \' \2 P3 i$ T' d - {
& F" N9 ?* X' P* t - temp = USART1->DR;. u1 ~: R) W5 \
- if(temp == 'G')
8 d% s2 S2 U6 i) S3 [0 c - {) I6 | [: |/ a- S- ]5 {0 h
- GPIOC->BRR = GPIO_Pin_13;
' l" f' J/ {6 T$ x2 n9 g0 Q - }else if(temp == 'K'). a( q+ s) l/ \( D/ T+ f
- {0 y6 T" P4 ?6 H. ^( W
- GPIOC->BSRR = GPIO_Pin_13;
" @) _" }' @# ]" _9 q/ G1 ?+ X - }! U. ?. f6 c1 J
- }1 U2 Q n# w* ?, `# K$ R2 v4 _
- if(USART_GetFlagStatus(USART1,USART_FLAG_TXE) && temp != '0')
% W: B+ U: a0 I- P( v - {
" ]% S& X8 G$ x' G* P: ~+ D1 D" K - USART1->DR = temp;
( Y7 G5 b8 @$ k. p9 N: a$ F - while(!USART_GetFlagStatus(USART1,USART_FLAG_TC));
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: n' ~' N2 S! ]* U( \2 n - }
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9 m) `+ m! T" V4 X# h y版权声明:家安
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