STM32F407ZE开发板实现使用串口USART1接收、发送字符串实例
% L. o2 e, y& P; L具体代码及解析如下:
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7 g" k- j" a& @: \8 Tmain.c部分# T+ t2 y8 u$ t0 D7 F0 Q
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- #include <stm32f4xx.h>
1 _3 d# I# E' S' g" V - #include "led.h"' h% ^6 V2 F- j; v2 l" ~
- #include "ustart.h"; s7 X7 ^0 p2 Z+ F8 r
- #include <string.h>
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- int main()
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- LED_Init();
\+ v" h* \! b: { H - USART1_Init();
$ N2 Q1 p, u% k' ? - USART_SendString(USART1, "Hello world!\r\n");' G w& o: S. n
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- while(1)
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- if(Receive_Flag == 1) //接收数据标志位等于1(接收完毕,停止接收)# v! ?, Y# q$ G1 t' u5 i
- Receive_Flag = 0; //接收数据标志位置0(可以开始接收)
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- }
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ustart.h部分7 [/ }' j% B( o: ]8 `7 P$ Y- N; @
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- #ifndef USTART_H/ y! L+ b/ A( d- S/ v8 \2 ?4 _8 ^
- #define USTART_H
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- #include <stm32f4xx.h>
2 ~% G: B1 [( y, n! G, @$ w - #include <stm32f4xx_usart.h>
4 Z; z2 b& r; h) F$ Q - #include <stdio.h>
$ x, K& D1 {$ l1 K9 }) G8 X5 ] - #include "sys.h"
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, r; l# n% y' U- extern char USART1_ReceiveData[50]; //接收PC端发送过来的字符/ |/ A6 f! Q9 R5 t* [9 I' o# R
- extern int Receive_Flag;
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- void USART1_Init();4 ?6 l0 u# B2 `( V! h
- void USART_SendString(USART_TypeDef* USARTx, char *DataString);
/ E; n2 G! F2 O - #endif
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& G# O! `% B' X$ [0 Oustart.c部分+ t& R" t) M1 E
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- #include "ustart.h". a ~1 z! k' Y2 w: }8 N5 d
- #include <string.h>
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- int fputc(int ch, FILE *f)
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- /* 发送一个字节数据到串口 */2 x2 o' l1 _! u, s: N" x: m
- USART_SendData(USART1, (uint8_t) ch); //程序开始时,会发送一次数据,ch是系统分配的(可能是0),串口会显示大概两个空格的内容* h+ U) @; O6 ]
- /* 等待发送完毕 */$ b+ |4 F2 W- X2 p1 H3 H" q
- while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);0 l( E* x, ]' Y4 H7 K, d
- return (ch);
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- void USART1_Init()
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- GPIO_InitTypeDef GPIOInit_Struct;
3 }, p, e8 j7 p; N - USART_InitTypeDef USARTInit_Struct;
2 |0 F. L7 b) R: g - NVIC_InitTypeDef USARTNVIC_Struct;
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: ~& j: c- y4 d0 B4 g% M - //1、使能时钟! m. G3 o- \! l) u' b
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
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- //2、初始化对应的IO引脚复用为USART1功能- b, K7 g" I. e% v5 X8 ]
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);$ h8 u Z' c1 z- `% d
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2 d, i: l$ }& j- Q. L, E2 u - GPIOInit_Struct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;3 p) w: U4 |8 D3 }; X& I f
- GPIOInit_Struct.GPIO_Mode = GPIO_Mode_AF;0 I5 Y; O3 o+ f o' P/ R& l% o
- GPIOInit_Struct.GPIO_OType = GPIO_OType_PP;
7 p% U+ |! d7 M& J( P - GPIOInit_Struct.GPIO_Speed = GPIO_Fast_Speed;
" j9 E( Y K: } Q5 d - GPIOInit_Struct.GPIO_PuPd = GPIO_PuPd_UP;
- z+ d, b, }4 W* } - GPIO_Init(GPIOA,&GPIOInit_Struct);
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- //将PA9 PA10复用为USART1功能4 [9 R+ ^; D3 x4 P4 ~1 B0 |7 A
- GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);( j* V% L0 L ^4 I% \
- GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);
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- //3、USART1初始化/ N0 Z" D# ?+ G8 r/ A6 L
- USARTInit_Struct.USART_BaudRate = 115200; //波特率- R- P( R& s. v. ?
- USARTInit_Struct.USART_Parity = USART_Parity_No; //无校验位% q6 h# C, |! g7 Y6 ]
- USARTInit_Struct.USART_StopBits = USART_StopBits_1; //1位停止位5 E- I8 v' n; T
- USARTInit_Struct.USART_WordLength = USART_WordLength_8b; //8位数据位
2 d. l' n+ V; s" [' i - USARTInit_Struct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式* m/ S, {6 ?" ~0 ]; ]
- USARTInit_Struct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件控制流+ x8 @7 a% i; U. V
- USART_Init(USART1,&USARTInit_Struct);! [3 s* k7 h8 S6 T0 j+ q, v
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) y) G2 ]2 T) j1 c+ _- F - //开启串口终端
% R3 T# S$ g: W- Y2 d% q, {# l; U - USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);7 _4 `0 @1 j( |
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- USARTNVIC_Struct.NVIC_IRQChannel = USART1_IRQn;//stm32f4xx.h
' ^( w5 L1 M, A, v- q3 C) }' m- u6 v% v1 h - USARTNVIC_Struct.NVIC_IRQChannelPreemptionPriority = 0;
% S6 f/ M1 |, k& a - USARTNVIC_Struct.NVIC_IRQChannelSubPriority = 0;; K4 `7 a& ]8 E' D: E6 n6 k
- USARTNVIC_Struct.NVIC_IRQChannelCmd = ENABLE;
* c. W: T* S" Y$ @! z' A - NVIC_Init(&USARTNVIC_Struct);
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0 A) d4 T" G) _' ` - //4、开启串口( w5 j( N& _5 g3 A8 K" C
- USART_Cmd(USART1,ENABLE);
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- void USART_SendString(USART_TypeDef* USARTx, char *DataString)
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6 D( g/ g1 \" b/ x; i - int i = 0;
% s' F+ Y4 K+ `3 W: V# n% t- ~" z! m - USART_ClearFlag(USARTx,USART_FLAG_TC); //发送字符前清空标志位(否则缺失字符串的第一个字符)
2 ]6 w3 V4 K0 T - while(DataString<i> != '\0') //字符串结束符
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- USART_SendData(USARTx,DataString<i>); //每次发送字符串的一个字符2 J3 n9 z/ {6 W* e. Q: N
- while(USART_GetFlagStatus(USARTx,USART_FLAG_TC) == 0); //等待数据发送成功
2 {! e% [% A Z, Q - USART_ClearFlag(USARTx,USART_FLAG_TC); //发送字符后清空标志位9 w! h6 C1 j: U. w
- i++;
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- }
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# M) M d* X/ I2 s, E! K- char USART_ReceiveString[50]; //接收PC端发送过来的字符( b6 }& C5 C5 F
- int Receive_Flag = 0; //接收消息标志位
$ _! a/ M8 a$ g) _1 Y1 J ? - int Receive_sum = 0; //数组下标* _) Q7 |) h! ]; s4 h- N
- void USART1_IRQHandler(void)4 U* a& W, N( m& w) I z: l m
- {
5 E* N9 o+ \, D# A - if(USART_GetITStatus(USART1,USART_IT_RXNE) == 1) //USART_FLAG_RXNE判断数据,== 1则有数据
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8 R" o7 E1 O4 t: { - if(Receive_sum > 49) //数组能存放50个字节的数据 : R( _: t2 R3 g' Z" ~2 E: R$ |
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- USART_ReceiveString[49] = '\0'; //数据字节超过50位时,将最后一位设置为\0
! g. t. e2 d* ^# F, w( E - Receive_Flag = 1; //接收标志位置1,停止接收数据5 f' d0 _6 G5 r! r' I8 S4 @8 m5 D
- Receive_sum = 0; //数组下标置0" c* T( \% K0 R% S0 v
- }
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. d( Y# W ]+ j( w- ?% z - if(Receive_Flag == 0) //接收标志位等于0,开始接收数据; s; l* p$ z2 S" c9 D' |, m: q
- {
; r. u9 }, w, p# l& s* K - USART_ReceiveString[Receive_sum] = USART_ReceiveData(USART1); //通过USART1串口接收字符
" q: W5 t; z8 {1 n2 z v- R - Receive_sum++; //数组下标++
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- if(Receive_sum >= 2) //数组下标大于2! }! K$ F2 b$ q, u
- {
$ M' B$ T& I8 r1 [ - if(USART_ReceiveString[Receive_sum-2] == '\r' && USART_ReceiveString[Receive_sum-1] == '\n' )2 l' O5 Y+ D" e: P& w
- {
! f% M$ B# r6 y - USART_ReceiveString[Receive_sum-1] = '\0'; ) j! H* V* m* k# R
- USART_ReceiveString[Receive_sum-2] = '\0';
, F9 e$ W/ e% k1 C - Receive_Flag = 1; //接收标志位置1,停止接收数据0 e2 {7 D n/ Q
- Receive_sum = 0; //数组下标置0
/ F' Y7 Z- q t/ Z - printf("%s\r\n",USART_ReceiveString); % Y6 P1 d7 Z6 D o, i9 C. }
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- if(strcmp(USART_ReceiveString,"hello") == 0)* j) T w# ]* V3 I+ n
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- PFout(9) = !PFout(9);" I6 T0 x: v" r/ ?- }: u$ V
- }
; y6 f9 Y0 d. S - if(strcmp(USART_ReceiveString,"world") == 0)
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- PFout(10) = !PFout(10);2 C$ o6 G6 `* k: Q4 o. D% ?! ]
- }
1 t. o. ^" P+ n. ^, t - if(strcmp(USART_ReceiveString,"jiajia") == 0)
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- PEout(13) = !PEout(13);
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0 |$ {- c( _% @ - if(strcmp(USART_ReceiveString,"haha") == 0)
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- PEout(14) = !PEout(14);
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- USART_ClearITPendingBit(USART1,USART_IT_RXNE); //接收后先清空标志位
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- }</i></i>
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8 Y7 h x9 W8 y& E0 D5 J8 oled.h部分( r! U' y; x: N7 t: a
, {& M$ n3 B# [4 r4 s8 S- #ifndef _LED_H_
2 R# M& m, [# |7 f - #define _LED_H_5 C2 d4 c" u1 j. I7 `
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- #include <stm32f4xx.h>. e( I% k+ D5 D& p3 m
- #include "sys.h"
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8 d& K4 I7 E9 j) |4 i* S) o- D! C- void LED_Init(void);
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" |* v* m3 k6 d6 v2 }- #endif
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led.c部分
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% w9 @" a' ^' ]- y: [- #include "led.h"
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. y7 [' ^" a- c7 s- void LED_Init(void)
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+ \9 @: h% T1 [! U) M - GPIO_InitTypeDef aaa;
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4 W7 ]& t9 c0 O! E; L - //1、先开启对应用到的模块时钟节拍
3 S. ~8 V" t% T8 \ k- w' s0 h: s. i - RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF,ENABLE);
' c+ C/ B- X7 r: [5 j - RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE,ENABLE);//PE组时钟! V. t3 b! x7 ~' K9 v
% S- t) { |0 p5 L) k- //2、可以初始化配置GPIO F组的9号引脚7 y$ h" _+ E4 I# a
- aaa.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;! r ]+ j! G2 B
- aaa.GPIO_Mode = GPIO_Mode_OUT;//输出模式
* {3 l3 k" r* ?; o' N7 V8 v3 z4 { m1 B - aaa.GPIO_Speed = GPIO_Fast_Speed;//快速 点灯和引脚速度无关
% G& U7 D. K4 A/ o - aaa.GPIO_OType = GPIO_OType_PP;//推挽输出
! ]# O k7 H& g; D! H& d - aaa.GPIO_PuPd = GPIO_PuPd_UP;//内部上拉; k. _% |0 S0 G0 {+ h# u E
- GPIO_Init(GPIOF,&aaa);
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/ m. `1 Z* o# T% b z$ ]1 L - aaa.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
* B+ e$ @4 |$ P4 e J2 J - GPIO_Init(GPIOE,&aaa);/ C: L& ?, H/ C& e
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$ w2 v! ]" ?' h, O4 V A2 V - //初始化完成 灭掉4盏灯; K( [- i$ O! k, g
- PFout(9) = 1;
# G- X- m4 M, @. m7 U1 c& \ - PFout(10) = 1;+ o+ \ l" C$ x
- PEout(13) = 1;
3 E1 p5 u) f, b! K& y8 W& O" f - PEout(14) = 1;- d" ^- t. L Y5 U. M4 c. I; x
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- }
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' v) [# }: z/ g# k% ysys.h部分
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( A' n K% Y1 P) K8 e F- #ifndef __SYS_H8 \# r; e" c9 K2 [. \6 o
- #define __SYS_H ; @2 M% d5 K2 b" u. x
- #include "stm32f4xx.h" - x6 Y3 Z8 S! x: {) w# E! D
* T' Y! O. q U/ I5 i. f- //IO口操作宏定义: s3 A# F5 q% G7 d
- #define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr & 0xFFFFF)<<5)+(bitnum<<2))
. E3 r- d' _1 k. x - #define MEM_ADDR(addr) *((volatile unsigned long *)(addr)) 0 F5 t3 M2 P0 `
- #define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum))
, u: ]9 l; k8 J3 I4 B5 f! B - //IO口地址映射
5 L/ d; M9 E1 e" `6 J - #define GPIOA_ODR_Addr (GPIOA_BASE+20) //0x40020014
: w2 A8 j6 q) b K4 I# Q' Y - #define GPIOB_ODR_Addr (GPIOB_BASE+20) //0x40020414 ! v; z( p4 K- ?- H; y2 q; W
- #define GPIOC_ODR_Addr (GPIOC_BASE+20) //0x40020814 ' ?7 L$ p* [( B2 h1 Y
- #define GPIOD_ODR_Addr (GPIOD_BASE+20) //0x40020C14
5 R1 L) e+ s* c% v5 |5 G( i8 u - #define GPIOE_ODR_Addr (GPIOE_BASE+20) //0x40021014 / G* X/ T. N' L4 M; A: G$ o8 [
- #define GPIOF_ODR_Addr (GPIOF_BASE+20) //0x40021414
( x' B" t6 t; y' E3 |: W - #define GPIOG_ODR_Addr (GPIOG_BASE+20) //0x40021814 - I0 |7 I) b, F. Q5 a6 B
- #define GPIOH_ODR_Addr (GPIOH_BASE+20) //0x40021C14 ; w* e H$ t# [
- #define GPIOI_ODR_Addr (GPIOI_BASE+20) //0x40022014 7 n# H6 \ o# y+ [
! \4 j5 U. K8 _- ]* i- #define GPIOA_IDR_Addr (GPIOA_BASE+16) //0x40020010
1 |2 v* n, w1 {, |! a1 E+ Z - #define GPIOB_IDR_Addr (GPIOB_BASE+16) //0x40020410
' I% _& E. c/ p2 v1 X) U* F2 D( Y - #define GPIOC_IDR_Addr (GPIOC_BASE+16) //0x40020810
% ?6 p% c2 q# G8 d8 z/ Z0 P - #define GPIOD_IDR_Addr (GPIOD_BASE+16) //0x40020C10
6 V( j& a0 M' @( }$ Q - #define GPIOE_IDR_Addr (GPIOE_BASE+16) //0x40021010
$ _0 n6 u$ {6 `1 [ - #define GPIOF_IDR_Addr (GPIOF_BASE+16) //0x40021410 . K5 h& q# r0 Y% p5 \: T
- #define GPIOG_IDR_Addr (GPIOG_BASE+16) //0x40021810 0 S; Q" T; A/ @' d# q1 V
- #define GPIOH_IDR_Addr (GPIOH_BASE+16) //0x40021C10
% j8 Y2 M& A# k0 y3 I! Y. f - #define GPIOI_IDR_Addr (GPIOI_BASE+16) //0x40022010 3 `3 T# i7 R9 d" p
- * s- n2 h5 x! K$ b; a/ R, j, v! b) z
- //STM32中 对寄存器的访问 是不能单独访问寄存器的单个bit 只能以32bit地址访问寄存器
7 m: [& x, }- D& G7 _& s" T8 L- e - //这些位为只写形式,只能在字(word)--4byte、半字2byte 或字节模式下访问 % t3 {. @: ~- t" N, M5 y3 S* g4 e
- //IO口操作,只对单一的IO口!5 X) I/ G3 D; K% I% v
- //确保n的值小于16!) @( z' k' s: ^) G
- #define PAout(n) BIT_ADDR(GPIOA_ODR_Addr,n) //输出
& k' u& k. T" c0 L4 y8 K - #define PAin(n) BIT_ADDR(GPIOA_IDR_Addr,n) //输入 / u) C& V v7 l1 f! e
- 8 G! w3 n `0 U7 S& }( l
- #define PBout(n) BIT_ADDR(GPIOB_ODR_Addr,n) //输出
; M! _- s- v# V - #define PBin(n) BIT_ADDR(GPIOB_IDR_Addr,n) //输入
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- #define PCout(n) BIT_ADDR(GPIOC_ODR_Addr,n) //输出
P5 k1 i: K- ?$ |9 ?0 d - #define PCin(n) BIT_ADDR(GPIOC_IDR_Addr,n) //输入
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- #define PDout(n) BIT_ADDR(GPIOD_ODR_Addr,n) //输出 2 K8 X+ ?/ D. | V
- #define PDin(n) BIT_ADDR(GPIOD_IDR_Addr,n) //输入
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- #define PEout(n) BIT_ADDR(GPIOE_ODR_Addr,n) //输出
, b5 @0 Y; k% f! n# q - #define PEin(n) BIT_ADDR(GPIOE_IDR_Addr,n) //输入9 n. o1 q# h& e$ K/ V" U
- 6 W/ E! Z5 v0 m3 _6 y, i
- #define PFout(n) BIT_ADDR(GPIOF_ODR_Addr,n) //输出
8 A$ T' h* y. }+ T - #define PFin(n) BIT_ADDR(GPIOF_IDR_Addr,n) //输入
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. i* C! V4 I$ O6 c+ c/ ~. s8 Q- #define PGout(n) BIT_ADDR(GPIOG_ODR_Addr,n) //输出
( y* g: l6 j/ ?% S7 ^ - #define PGin(n) BIT_ADDR(GPIOG_IDR_Addr,n) //输入
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6 H: g, U; ?6 }7 q3 Y- #define PHout(n) BIT_ADDR(GPIOH_ODR_Addr,n) //输出
8 {, F; M+ }1 Q$ M) C8 V( O - #define PHin(n) BIT_ADDR(GPIOH_IDR_Addr,n) //输入2 ?0 |- w/ N4 ]- p9 A+ x' S- h
- 7 K" f: V% E/ r
- #define PIout(n) BIT_ADDR(GPIOI_ODR_Addr,n) //输出 1 h+ N& O, }" J# h o) Q
- #define PIin(n) BIT_ADDR(GPIOI_IDR_Addr,n) //输入3 y" ^* ~1 P9 m0 ~& {
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- #endif
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