首先,总结全文,设计步骤主要如下:0 s: ~& g% ]/ z- O5 N
1,初始化GPIO/ Z* A8 L- C0 \
2,初始化USART1
% i. X. `% c' y% M6 r! L3,初始化NVIC(嵌套向量中断控制器)
2 M7 ~8 W2 C+ C6 \" d2 z. a4,编写中断服务函数
R6 W, W+ t; G# {" F) ^* P: R5,编写主函数
5 C5 _* d# i7 O! R: u9 f J/ G1 c& h# V) f- J4 R
详细步骤如下:# P3 S' Q; {, q# p" e
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1,初始化GPIO% B! E! y* Z, H5 |# A$ m
- void IO_Init(); d- G6 P" ~: }: s, I$ ^
- {1 Q) o& ]- i" X5 J1 ^* P, l
- GPIO_InitTypeDef Uart_A;: M9 ^0 W9 H+ `4 x- h& ]% z& ~
- GPIO_InitTypeDef led;% n. _4 Y1 i. T0 y6 G& m8 ^3 |$ F) `
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC| RCC_APB2Periph_AFIO,ENABLE);
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- GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable|GPIO_Remap_SWJ_JTAGDisable,ENABLE);
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2 b/ H# m6 E' i. J5 E6 Q7 f - led.GPIO_Pin = GPIO_Pin_13;//博主开发板上的LED灯接的GPIOC的13引脚
. p+ }+ P& P) c/ U4 | - led.GPIO_Mode = GPIO_Mode_Out_PP;, b& _; k# s) @5 t) X! O; @* H
- led.GPIO_Speed = GPIO_Speed_50MHz;
; @9 H, x3 T" y! f - GPIO_Init(GPIOC,&led);
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N0 ~: M ~9 ]7 ~9 \, d - Uart_A.GPIO_Pin = GPIO_Pin_9;; v# W3 K3 v2 Q1 o# v
- Uart_A.GPIO_Speed = GPIO_Speed_50MHz;, j4 f# |5 k& r9 Q! K
- Uart_A.GPIO_Mode = GPIO_Mode_AF_PP;* ]- b9 h3 J; c) \, `
- GPIO_Init(GPIOA,&Uart_A);
' j2 z5 O. s1 ~! |1 o - 2 i8 s1 G* ]# Y e$ _8 F
- Uart_A.GPIO_Pin = GPIO_Pin_10;
% F' x* D$ J; a7 T0 L2 m' T - Uart_A.GPIO_Speed = GPIO_Speed_50MHz;
Z8 t% ?4 U0 t- ?! j8 G5 e - Uart_A.GPIO_Mode = GPIO_Mode_IN_FLOATING; 0 B _# A4 @7 o" x0 y$ j0 W' [; W
- GPIO_Init(GPIOA,&Uart_A);/ s; b( e9 }; \) A
-
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% L% |- E- x( r8 J' g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5 V+ e6 ]7 J" b9 m v$ [% _
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% z# U; l% ~& v; l, ?* p2,初始化USART10 \) J* ^- w& l- A2 {6 E# U
- void Usart1_Init()# Z; A% l) z( O8 T* {
- {
& X4 J$ n! k3 x" C& N! y1 j6 Z - USART_InitTypeDef Uart;
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/ e* ^2 ?5 E2 \: n - RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
4 M E; |6 Y. V9 O5 L - Uart.USART_BaudRate = 115200;& l! r' T) m, Z- W# `
- Uart.USART_HardwareFlowControl = USART_HardwareFlowControl_None;7 T: K9 S7 F) u; S2 N
- Uart.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;7 T4 {' F! x9 G4 K3 `) g
- Uart.USART_Parity = USART_Parity_No;
$ g( \1 z0 j: j& c# b1 M0 J - Uart.USART_StopBits = USART_StopBits_1;/ ^7 l4 A- h$ e2 ~
- Uart.USART_WordLength = USART_WordLength_8b;
' i9 u4 J" P$ X. |+ B; R+ s) F. S+ [ - USART_Init(USART1,&Uart);
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; F/ g; `) ^& k) v - USART_Cmd(USART1,ENABLE);1 ~. u' E% I; [6 m' d
- USART_ClearFlag(USART1,USART_FLAG_TC);
% Z; g5 O5 T/ S1 X/ r - }
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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; _9 A( F9 I, o2 ~8 s( x! I
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( A; c) ?6 @ v, }1 x V3,初始化NVIC) S- V/ ?3 B) ]' i6 ]% ~
首先,让我们来了解库函数中的NVIC结构体:0 c2 h) d: ?2 `! v' P* A, P
- typedef struct
. m& `( k- R; a$ g- z - {//指明那个中断通道1 i* f* t4 ~! `; i( E
- uint8_t NVIC_IRQChannel; /*!< Specifies the IRQ channel to be enabled or disabled.
+ W+ ^! s; L9 j1 d+ B8 n - This parameter can be a value of @ref IRQn_Type " @- z9 Y% z3 R9 v3 ?7 s! K
- (For the complete STM32 Devices IRQ Channels list, please3 Z9 [1 y; ?& l9 f; Y
- refer to stm32f10x.h file) */
2 S5 _/ E! h/ G, W0 M - //抢占优先级
* {: {; @; f8 {1 k3 v5 h - uint8_t NVIC_IRQChannelPreemptionPriority; /*!< Specifies the pre-emption priority for the IRQ channel- o# Y. i& a9 Z0 Z, R9 J5 ^2 V
- specified in NVIC_IRQChannel. This parameter can be a value
3 C+ T5 @; ~9 W: k v% ~% [! D9 G - between 0 and 15 as described in the table @ref NVIC_Priority_Table */# W0 Z4 t! w* M3 i: b& T& q$ E
- //子优先级, ^. C) ?4 S* k. W
- uint8_t NVIC_IRQChannelSubPriority; /*!< Specifies the subpriority level for the IRQ channel specified
$ B) m" Z" i3 K1 c. R+ Q+ V a - in NVIC_IRQChannel. This parameter can be a value
- K6 N0 |+ {9 D4 c - between 0 and 15 as described in the table @ref NVIC_Priority_Table */
8 C* D- j2 L1 E+ x% Q( L4 {" G: @& s - //中断通道使能
, ]9 L5 X% E# m0 o, o - FunctionalState NVIC_IRQChannelCmd; /*!< Specifies whether the IRQ channel defined in NVIC_IRQChannel
* s# J% ^; }0 e9 R - will be enabled or disabled.
6 d3 @4 @, p& r, O/ F! Z9 U - This parameter can be set either to ENABLE or DISABLE */
/ r7 A# F6 M" d a& Q! G - } NVIC_InitTypeDef;
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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
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; L, v: A7 e" t) Y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)5 K/ h1 e. K8 p4 F$ @ }6 k
- {
2 M9 [2 P% [4 W! p3 \# r [ - /* Check the parameters */
5 s% f& n* b' f# Z) ]" Y - assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));
5 C; y9 \3 j+ G0 t' ]: [2 \6 Q -
' B) m' ?% V" z% ? - /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */% C2 }3 x2 a& _! z$ z
- SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
8 I9 T; f2 g- y- g* q - }
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接下来,设置结构体中变量的值:
$ N0 u; _2 A7 [, O. {' k1 b+ y; d! j- nvic.NVIC_IRQChannelPreemptionPriority = 1;//抢占优先级- S: S! r' s4 d! ~" q! @7 s
- nvic.NVIC_IRQChannelSubPriority = 0;//子优先级
9 R" l+ h( r1 ]0 H8 ?/ j, ~ - nvic.NVIC_IRQChannel = USART1_IRQn;//中断通道% a8 j- k' w: L4 e
- nvic.NVIC_IRQChannelCmd = ENABLE;//通道使能3 C1 P5 V8 w X- w
- NVIC_Init(&nvic);//NVIC寄存器初始化
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4,编写中断服务函数
) V* e6 x6 S9 S% r先贴代码,在解释
8 Z; |; A7 U8 U4 X& @8 t8 q- 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';
" s, F; f) B& O8 _, h' D - if(USART_GetFlagStatus(USART1,USART_FLAG_RXNE) == SET)//判断是否接收到数据6 [3 u& D& \' H
- {( t6 \7 B! u8 Z) m8 r
- 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 r' Y- F" O' B' I% H
- if(temp == 'G')//如果接收到G 则关灯$ i* ]* p6 B0 O5 ?6 D
- {
5 ?8 i6 P$ h" A! E( w" @- ]% J# W - GPIOC->BRR = GPIO_Pin_13;$ w; R# n" a' l" |8 J% u% {
- }else if(temp == 'K')//开灯( ~+ Z5 X: [1 x- `7 [
- {
3 G% y) ^& a. J2 d8 I8 l, i - GPIOC->BSRR = GPIO_Pin_13;
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- 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
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d% {6 [" n# S9 W' F) d" Y - USART1->DR = temp;将接收到的数据再发送回去
' x3 c% V$ T9 W - while(!USART_GetFlagStatus(USART1,USART_FLAG_TC));等待数据发送完毕
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- }
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1 P9 Q9 T2 ^2 b5,编写主函数
' B$ j. ]$ p1 G& x老规矩,先贴代码再解释:
H9 A$ H3 g8 l* X; i. D- int main()
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. W; |) U" n9 ?/ Y6 y% e - IO_Init();8 E( k( f( Q2 k6 V
- Usart1_Init();
+ w% M& A( h" A- t- k( j - Nvic_Init();6 M( ?) A" L! q
- 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。# q ~/ p9 p* n }' P6 P8 H' T5 O
- GPIOC->BSRR = GPIO_Pin_13;4 |/ `! M' o0 ]
- while(1){}
; M) m" v0 Z2 L" Q$ ]' H4 @ - }
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额。。。突然发现没什么好解释的。( F+ S- t+ z" r7 E: v; E, G; {
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中断串口通信介绍到此完毕。. a" ^! C) @' ~9 i) }9 j
7 s! |, h4 v* j1 V$ ^本文完整代码如下:
4 A" h) M5 A# T! |# ^- #include<stm32f10x.h>* r* w8 Z) {1 ^' k) @9 M# Z
- #define uint unsigned int3 x2 V( |1 w$ `. m
- #define uchar unsigned char" R+ z# f: L4 n* b
- void delay(uint n)
& _( q% l0 p" I) M - {
; D' B4 d1 V4 i" c - int i,j;
+ `4 B; {" R2 L7 s - for(i=0;i<n;i++)/ S1 G l5 g8 ~( \
- for(j=0;j<8500;j++);
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+ e3 @7 d9 u' W -
: N8 ^7 S% g; c. ^# k0 m& B - void IO_Init()# N. N9 o5 }5 W8 Y
- {7 K/ Z& y' |- B5 L8 o; W
- GPIO_InitTypeDef Uart_A;
9 x, Q6 Y/ H! A% r- E - GPIO_InitTypeDef led;+ t3 x/ p: b1 R4 A
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC| RCC_APB2Periph_AFIO,ENABLE);% B5 |, ^2 c D" ?
-
) q$ C# r$ S( ]% M! I, }: ]9 e - GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable|GPIO_Remap_SWJ_JTAGDisable,ENABLE);
4 b% r& J. N, O U; [ -
7 \: @# S/ }6 B0 F! D/ I - led.GPIO_Pin = GPIO_Pin_13;, G$ T( c" b+ D
- led.GPIO_Mode = GPIO_Mode_Out_PP;
' I% A0 |8 g4 e! Y4 | J - led.GPIO_Speed = GPIO_Speed_50MHz;# I5 A1 T- |$ o
- GPIO_Init(GPIOC,&led);# ]' {7 o7 N6 o
-
& w8 u( X- Z* @! S' Y. W- r - Uart_A.GPIO_Pin = GPIO_Pin_9;
( b1 k: H& k' |- P# ^' v _7 M6 o3 s - Uart_A.GPIO_Speed = GPIO_Speed_50MHz;! }' F. e7 x1 W" _# a! Z ?
- Uart_A.GPIO_Mode = GPIO_Mode_AF_PP;8 I" i: S4 Y9 k3 x
- GPIO_Init(GPIOA,&Uart_A);) P$ s. k, h% R$ b. ^4 H
- 2 d$ C! w! \% Z& b0 H
- Uart_A.GPIO_Pin = GPIO_Pin_10;0 B( G4 U+ }. H( B) s
- Uart_A.GPIO_Speed = GPIO_Speed_50MHz;2 ^8 Y7 e6 ]6 F
- Uart_A.GPIO_Mode = GPIO_Mode_IN_FLOATING; //page 110$ P9 |2 T7 p; q# e
- GPIO_Init(GPIOA,&Uart_A);& L* `; [ d& A2 R& X& W# D2 V! k. l
-
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* U0 o' _( [7 M5 W9 J1 o - void Usart1_Init()+ z1 e' D/ Q( i
- {
9 _; N: a$ _7 J, z- B% A - USART_InitTypeDef Uart;
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- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
+ {; g9 o$ }' y4 V4 q) m2 D - Uart.USART_BaudRate = 115200;3 U% N, h0 m" U! S# N5 c" _
- Uart.USART_HardwareFlowControl = USART_HardwareFlowControl_None;/ k$ A1 C$ ]- M( U& z j
- Uart.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;- i i8 z8 H1 e& U( [2 Q/ o2 n
- Uart.USART_Parity = USART_Parity_No;' O$ {6 q: }) k g2 [9 X8 a
- Uart.USART_StopBits = USART_StopBits_1;- \, l8 ~% W0 k0 d
- Uart.USART_WordLength = USART_WordLength_8b;
% j1 s9 @+ f0 G' c5 B2 _+ ? - USART_Init(USART1,&Uart);; t! k4 o" \4 }
- : Y# D1 x' E6 f3 O
- USART_Cmd(USART1,ENABLE);5 Y3 Z" u& a+ i
- USART_ClearFlag(USART1,USART_FLAG_TC); //page 540
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4 @$ e" h# \6 r {, q( Z% m - void Nvic_Init()
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- NVIC_InitTypeDef nvic;
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- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
" d' Z/ G* F: E/ ]1 ]8 J3 k/ m -
: E( i& C n" }' \5 T) q, R7 E$ ` - nvic.NVIC_IRQChannelPreemptionPriority = 1;
7 m8 A2 D$ C8 f W7 o7 x - nvic.NVIC_IRQChannelSubPriority = 0;3 z) Q3 p/ b/ p7 E# G* o) K$ Q
- nvic.NVIC_IRQChannel = USART1_IRQn;
- j/ B. g+ g& | - nvic.NVIC_IRQChannelCmd = ENABLE;& L0 T) `8 O. z& m& ~/ t7 ]5 }
- NVIC_Init(&nvic);( S" {6 n+ E* W; X0 s
- }
# ?. f6 |" C) w: ~3 M- \ - 1 T7 s8 S$ m4 S/ `* E0 L5 f( ^
- int main()
8 L6 J% W3 ]0 x) o5 G - {
2 |2 j3 D: t) ~! o5 c - IO_Init();
. P8 J. g! D) x1 K: l4 g - Usart1_Init();+ n* L# _8 W b+ d
- Nvic_Init();
' f& |7 `2 \2 I1 r1 }& g - USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
0 s: {' D* u3 ?3 j1 o+ l" Q - GPIOC->BSRR = GPIO_Pin_13;) h$ w( a' P: k1 ~
- while(1){}
?' {( Z; i1 b5 ~% t - }
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( n6 E$ m6 L5 ~4 P3 d7 b - void USART1_IRQHandler(void), [# i P% {$ }& M
- {
& |$ i. `1 V; T1 m" r7 T; u - char temp= '0';9 E6 l7 M5 ]3 m8 ~: V) C
- if(USART_GetFlagStatus(USART1,USART_FLAG_RXNE) == SET)
& q/ x; Y8 |6 l3 N5 W - {
9 D* u0 \% [" c4 _& A7 F: x - temp = USART1->DR;
6 @1 g- L* s5 W6 j - if(temp == 'G')
# [$ _$ w; ]* }( F1 Z - {3 L- b1 |+ R& {+ g4 B$ e
- GPIOC->BRR = GPIO_Pin_13;
5 A5 g) K* _8 z% D+ x( Q0 N2 j - }else if(temp == 'K')
$ ?1 C7 }; I& V: @9 d2 S - {
9 O3 @0 Y. Q( {, h" @& X - GPIOC->BSRR = GPIO_Pin_13;) c; n4 C4 Y0 c3 }) i
- }
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- if(USART_GetFlagStatus(USART1,USART_FLAG_TXE) && temp != '0')
; j+ k9 M. d0 o - {
. B( w7 K" `$ b N* F7 o; ?/ u - USART1->DR = temp;3 p+ ]/ b' z' X5 h: }! O: i
- while(!USART_GetFlagStatus(USART1,USART_FLAG_TC));
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- }
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版权声明:家安8 `. [# D8 a# C5 v2 M6 B: }& H$ w
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