STM32F407ZE开发板实现使用串口USART1接收、发送字符串实例
- x( o6 @# L4 [9 N/ C2 E; C具体代码及解析如下:" S$ |' {* s3 p; L y
% n' Q1 Q$ c6 Z9 H |% ]3 wmain.c部分( B$ B3 V9 W6 P" k+ H; y0 |, A
' k5 Z0 ` L5 R1 t- #include <stm32f4xx.h> ) Y; A7 s( o V7 I! p; R6 h. v
- #include "led.h"
. U( c, [) E* c% x3 j/ r! F - #include "ustart.h", x, B9 f% i/ P( k0 f1 Z- \5 g
- #include <string.h>
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8 |1 G' p2 X: i- int main()% T5 k& F! L/ Q8 e
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- LED_Init();
; B8 t- l3 N; k1 A/ i3 F - USART1_Init();4 L9 \4 b, V( r* k3 G1 g" E9 j1 C
- USART_SendString(USART1, "Hello world!\r\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)0 s T, `/ C& C. Q! W# k' V
- Receive_Flag = 0; //接收数据标志位置0(可以开始接收)' I8 U5 m, `: t- [+ M
- }
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ustart.h部分" R4 D) ^# z8 y& k
/ ], ~' y$ S! z" ~0 @- #ifndef USTART_H
$ [5 a$ j7 ]' ]2 p - #define USTART_H
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: ?; w) \: u* V, u' K- #include <stm32f4xx.h>
0 G" u: Q8 h: L; {4 r: w - #include <stm32f4xx_usart.h>
- G$ o# G. v! ]* E0 I( A e+ Z - #include <stdio.h>
& [7 Z3 s+ P! `- p( f# z - #include "sys.h"
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( Z$ n# Z- m+ l' W6 W/ s- extern char USART1_ReceiveData[50]; //接收PC端发送过来的字符
: v+ L; L, G1 a. C) }: ~' X0 x - extern int Receive_Flag;0 | c6 K1 B& z# K# H! N: T
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- void USART1_Init();( }% _' ~7 S. M, M8 f: N1 J% i3 W/ f/ x
- void USART_SendString(USART_TypeDef* USARTx, char *DataString);
: T; B' J9 x9 r1 U2 E; z7 c$ ] - #endif
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0 n1 R: X1 f: G5 s) Wustart.c部分
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- #include "ustart.h"& _$ q6 ]9 w+ _2 [4 G- X; v( w
- #include <string.h>
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- int fputc(int ch, FILE *f) * R- c; z/ A: h
- {6 G+ f% Y3 f' J& K9 T0 u- p8 s8 {
- /* 发送一个字节数据到串口 */3 P1 l; T p- b; { ^. s
- 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; F/ G9 P7 T) S- m1 F6 F, H
- /* 等待发送完毕 */
7 H7 i7 g E3 b3 u0 f- k9 g4 x - while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);9 A9 Q2 C1 n9 H8 h# J
- return (ch);
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- void USART1_Init() h' n% j |8 j, |7 |
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- GPIO_InitTypeDef GPIOInit_Struct;7 S% F0 l+ |- Q7 C" W" H
- USART_InitTypeDef USARTInit_Struct;6 n4 _* H, e& ?+ ^
- NVIC_InitTypeDef USARTNVIC_Struct;2 c6 k. F; s# M5 N! Y/ B4 d
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- //1、使能时钟3 B/ G. Z6 h. R' h; L$ O1 j2 H% l
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);- }: g' f, n- X- ~
-
! r9 m y0 h* q3 i, Z - //2、初始化对应的IO引脚复用为USART1功能: }' i& Q+ G2 a, F: X
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);1 ~( G i# h; }" L2 c
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- GPIOInit_Struct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;8 i( k6 c: J0 L! f5 _
- GPIOInit_Struct.GPIO_Mode = GPIO_Mode_AF;7 O# U& |8 U* L2 N
- GPIOInit_Struct.GPIO_OType = GPIO_OType_PP;0 y8 l0 V* q$ h$ w$ C/ ~2 }0 p
- GPIOInit_Struct.GPIO_Speed = GPIO_Fast_Speed;
+ n- L: B* Q5 a, I - GPIOInit_Struct.GPIO_PuPd = GPIO_PuPd_UP;
/ N8 ]- w1 T: p" Z. j - GPIO_Init(GPIOA,&GPIOInit_Struct); M1 l* B, ~2 K! T
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- //将PA9 PA10复用为USART1功能
3 o c' C0 U( w+ \4 Y - GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
; I) e8 t' \; \$ r. H5 e- ? - GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);
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& A# o: P1 ], E9 P8 k2 h7 O' s - //3、USART1初始化
8 X, e4 z7 R) I - USARTInit_Struct.USART_BaudRate = 115200; //波特率
+ x( P! c! G3 p7 @4 j; Z U3 l - USARTInit_Struct.USART_Parity = USART_Parity_No; //无校验位$ ?& [1 T' \ Z( |6 G
- USARTInit_Struct.USART_StopBits = USART_StopBits_1; //1位停止位8 B' t6 @, _/ {/ Q7 Q2 H
- USARTInit_Struct.USART_WordLength = USART_WordLength_8b; //8位数据位
7 Q3 }% f0 |; p% s - USARTInit_Struct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式1 a9 z+ [% X( |6 c. M, w: C
- USARTInit_Struct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件控制流
4 x( w; o, J2 h6 S: a d - USART_Init(USART1,&USARTInit_Struct);5 z: W5 N+ |1 [" H4 l6 A
-
; E4 J* b# B* {) p2 \% h0 |3 ~/ y - //开启串口终端
& V0 g- |2 X* W- ]1 Z, T: W - USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
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8 r9 A) w% `7 X3 E - USARTNVIC_Struct.NVIC_IRQChannel = USART1_IRQn;//stm32f4xx.h
4 _2 q8 j2 m, c! G1 `4 e - USARTNVIC_Struct.NVIC_IRQChannelPreemptionPriority = 0;
: ~! c+ Z; H" B$ M/ Q9 R& k - USARTNVIC_Struct.NVIC_IRQChannelSubPriority = 0;
+ G4 G9 O) w5 S5 F6 w - USARTNVIC_Struct.NVIC_IRQChannelCmd = ENABLE;
& a2 M* y0 p4 E" G' S, v i# v - NVIC_Init(&USARTNVIC_Struct);& p& I5 v4 |, r9 k
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- //4、开启串口0 `0 d# d& X: T4 Z- Z5 z0 G$ v
- USART_Cmd(USART1,ENABLE);5 E) Y- E; c, e! _
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3 w5 F! C7 }: N5 B# W8 x t) Y- void USART_SendString(USART_TypeDef* USARTx, char *DataString)
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- int i = 0;9 o4 _7 L2 @, v1 w+ }/ g0 l
- 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)
( O0 p& a7 J0 ~) q( E - while(DataString<i> != '\0') //字符串结束符# D% B6 d7 y7 P, n
- {
" P; K" G2 z9 c7 a! M6 T1 ^# X - USART_SendData(USARTx,DataString<i>); //每次发送字符串的一个字符) n# W) r. T3 \2 W. m
- while(USART_GetFlagStatus(USARTx,USART_FLAG_TC) == 0); //等待数据发送成功
, Y* a; A1 G# d0 B6 [3 V - USART_ClearFlag(USARTx,USART_FLAG_TC); //发送字符后清空标志位
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- char USART_ReceiveString[50]; //接收PC端发送过来的字符
" U0 f, j, w8 F# n- x - int Receive_Flag = 0; //接收消息标志位
# N* G; O5 T/ Y4 x& K - int Receive_sum = 0; //数组下标# A( J5 t+ x% Z- h; Y
- void USART1_IRQHandler(void)
?* `5 ^8 k; I6 b - {
* O2 G" C1 d% h% e+ o6 Q - if(USART_GetITStatus(USART1,USART_IT_RXNE) == 1) //USART_FLAG_RXNE判断数据,== 1则有数据" T& H- o1 q5 G1 V' Y; v- ]
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- if(Receive_sum > 49) //数组能存放50个字节的数据 6 c" h& S, ^3 Q7 y' O) p
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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 D S/ R0 ?# U/ `( P
- Receive_Flag = 1; //接收标志位置1,停止接收数据& K: ^6 Y4 e. `( n7 i
- Receive_sum = 0; //数组下标置0
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- if(Receive_Flag == 0) //接收标志位等于0,开始接收数据: U: ^* n2 M6 S5 U P! H3 I# w/ ]* y
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- USART_ReceiveString[Receive_sum] = USART_ReceiveData(USART1); //通过USART1串口接收字符6 x; o$ j1 x/ r8 q9 _3 I
- Receive_sum++; //数组下标++; _+ d8 }/ H& O. y5 ]
- }
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! B5 o- o+ [' L. J - if(Receive_sum >= 2) //数组下标大于2' @" I2 w7 u! e' H) |
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- if(USART_ReceiveString[Receive_sum-2] == '\r' && USART_ReceiveString[Receive_sum-1] == '\n' )5 C1 r% t2 G( R$ C, [' r
- {
* N" t$ I+ `) L2 R. e - USART_ReceiveString[Receive_sum-1] = '\0';
3 I8 r F7 y4 s& q T - USART_ReceiveString[Receive_sum-2] = '\0';7 Z/ l; m! Z$ \ B! Z
- Receive_Flag = 1; //接收标志位置1,停止接收数据- y6 K. j' {) q+ _
- Receive_sum = 0; //数组下标置0
% W: r4 p2 Z: v/ A - printf("%s\r\n",USART_ReceiveString); % v* A8 X' N2 v1 C
! W3 {% M; @7 C* S4 H6 w& A4 G2 f; f: G- if(strcmp(USART_ReceiveString,"hello") == 0)
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- PFout(9) = !PFout(9);9 G- H. ~. t1 I. b6 z' H! m0 i
- }
% F3 f% x6 W8 [9 {' E3 l/ T6 g3 H& L - if(strcmp(USART_ReceiveString,"world") == 0)2 O$ w& p- U' Z9 R
- {
4 @5 l0 P/ B* ` - PFout(10) = !PFout(10);' e7 Z3 `8 L, s" I. s7 e
- }
8 X0 n2 X6 Y* e! b7 N: K - if(strcmp(USART_ReceiveString,"jiajia") == 0)
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- PEout(13) = !PEout(13);
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) L' i) ~0 k b. G6 F2 r' ?% s - if(strcmp(USART_ReceiveString,"haha") == 0)6 v! V _3 t- _8 H* f! l- a
- {
( ]' ~( ]. C' k- d - PEout(14) = !PEout(14);
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- }
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- USART_ClearITPendingBit(USART1,USART_IT_RXNE); //接收后先清空标志位
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& }0 d& j0 S, Q/ H3 U - }</i></i>
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6 i& o. u% \' }2 i6 D! cled.h部分* ?9 c5 u9 _( B, _3 \& r
9 v7 d% L7 _$ ~1 x1 ^6 B1 d0 ^- #ifndef _LED_H_
1 g2 z, @+ H9 ?$ ] Y1 o- u$ _ - #define _LED_H_
# u& {! F2 T. t; Y! u) g0 A - : [0 }* A: g( ~
- #include <stm32f4xx.h>
2 O$ |1 G) k" ?- P1 E. a5 C - #include "sys.h"
* M1 q2 C) ^+ _! a# ~
: O: g7 T) ^4 J3 T& v3 g- void LED_Init(void);, B$ `0 ]) f$ T: D4 ~. Y9 a& k' u
' _. a E7 ]- w' e( g) i# ~- #endif
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led.c部分
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- #include "led.h"
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: r. T0 f8 N7 s% N- O9 ~- void LED_Init(void)( @2 j) o( ?! t' M$ T- }- W
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- GPIO_InitTypeDef aaa;
3 d5 L S0 R# R5 @3 ` - ; z5 p+ |# a- w8 `
- //1、先开启对应用到的模块时钟节拍
- d7 F" }/ d/ J4 @$ q8 _/ [ U - RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF,ENABLE);
4 s/ C" v$ S# z: S5 @ - RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE,ENABLE);//PE组时钟
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# g" S1 @) c) X$ g- //2、可以初始化配置GPIO F组的9号引脚5 d3 |3 y% Z9 _; ~) ~! f
- aaa.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;+ V; q% s6 e; L! _- A* s
- aaa.GPIO_Mode = GPIO_Mode_OUT;//输出模式
) c& m0 v3 s; i8 u- n5 V% Q; { - aaa.GPIO_Speed = GPIO_Fast_Speed;//快速 点灯和引脚速度无关% `0 s% Q! T X: h- S' ^
- aaa.GPIO_OType = GPIO_OType_PP;//推挽输出
1 W& j3 q" w" _4 W - aaa.GPIO_PuPd = GPIO_PuPd_UP;//内部上拉7 K8 C, w, U- h4 z! y, F/ L; u
- GPIO_Init(GPIOF,&aaa);
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- aaa.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
5 L9 E' U2 l2 V - GPIO_Init(GPIOE,&aaa);# I* e$ K. |" v6 {
-
" T: W0 Y0 y# J4 @& R - //初始化完成 灭掉4盏灯, n8 D* b- S0 k6 \7 {
- PFout(9) = 1;9 V/ P- `! G0 M: u3 r
- PFout(10) = 1;
- f6 [# L+ }% p. K, S - PEout(13) = 1; ~" z4 O/ h, {) k6 {, a
- PEout(14) = 1;9 t; I) M a" q
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- E' e) S1 s! H7 Csys.h部分
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- #ifndef __SYS_H; ?' ~; }1 ]% \& r
- #define __SYS_H " R3 q/ P B; g- J9 E0 V: V2 l+ c
- #include "stm32f4xx.h"
: U; L0 E% I5 ?7 x( S - ' R o- p0 a7 [* ]/ m% j% @
- //IO口操作宏定义 x) ^& [# H5 [: D4 O
- #define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr & 0xFFFFF)<<5)+(bitnum<<2))
3 g0 m# v* m9 `- [) F3 _$ F - #define MEM_ADDR(addr) *((volatile unsigned long *)(addr)) ' E2 i7 ^% a1 I. d H' {2 G
- #define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum)) - |1 t+ o6 N3 X$ p3 d0 ~
- //IO口地址映射1 m& q* n( r4 Y( h; u
- #define GPIOA_ODR_Addr (GPIOA_BASE+20) //0x40020014" b5 A4 H4 t `1 `
- #define GPIOB_ODR_Addr (GPIOB_BASE+20) //0x40020414 + Z; i+ _' Y( z* j; S
- #define GPIOC_ODR_Addr (GPIOC_BASE+20) //0x40020814
* u8 C' e. Q( o2 {0 ~+ D$ N' G( t G - #define GPIOD_ODR_Addr (GPIOD_BASE+20) //0x40020C14 4 S% C: @6 @3 f8 T6 X4 t
- #define GPIOE_ODR_Addr (GPIOE_BASE+20) //0x40021014 + t, o @4 o8 v; X+ Q9 b
- #define GPIOF_ODR_Addr (GPIOF_BASE+20) //0x40021414
9 j6 _* a3 M# c - #define GPIOG_ODR_Addr (GPIOG_BASE+20) //0x40021814 - a! z$ [" J0 g& {, e; f
- #define GPIOH_ODR_Addr (GPIOH_BASE+20) //0x40021C14 ( M. \3 K- j* f) l( r: A. L' _
- #define GPIOI_ODR_Addr (GPIOI_BASE+20) //0x40022014
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- #define GPIOA_IDR_Addr (GPIOA_BASE+16) //0x40020010
) L% U% D0 N+ u$ w# ?9 \9 n - #define GPIOB_IDR_Addr (GPIOB_BASE+16) //0x40020410 5 f; ~& ^1 W" P: o! h
- #define GPIOC_IDR_Addr (GPIOC_BASE+16) //0x40020810
, T: l B; j) Y4 d - #define GPIOD_IDR_Addr (GPIOD_BASE+16) //0x40020C10
0 @3 B0 t5 }* v; r( x$ K* Z - #define GPIOE_IDR_Addr (GPIOE_BASE+16) //0x40021010 : t; T- I/ |# y0 r! E% y0 m
- #define GPIOF_IDR_Addr (GPIOF_BASE+16) //0x40021410 & Z+ v' `" `8 O; S" y) n& e
- #define GPIOG_IDR_Addr (GPIOG_BASE+16) //0x40021810
9 u* p9 z" e! \ - #define GPIOH_IDR_Addr (GPIOH_BASE+16) //0x40021C10
, x4 j( k, n$ R8 B - #define GPIOI_IDR_Addr (GPIOI_BASE+16) //0x40022010 5 \2 a5 a/ b8 t! X! h
, X6 Q7 G& A3 v% ?' L3 ?3 G( b- //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8 F1 `+ v+ h3 Z+ T
- //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 - T- Y# N7 R- q7 q+ G3 A% F3 J: t
- //IO口操作,只对单一的IO口!* ]$ p9 ?- W6 e# B3 k* o) ^: x
- //确保n的值小于16!
, Z% }- J4 x# m$ v& T# G' G - #define PAout(n) BIT_ADDR(GPIOA_ODR_Addr,n) //输出 5 {2 L* e% y) v0 A; b8 ]5 Y
- #define PAin(n) BIT_ADDR(GPIOA_IDR_Addr,n) //输入
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3 _8 O' K4 V( ]. B- #define PBout(n) BIT_ADDR(GPIOB_ODR_Addr,n) //输出
5 k Q6 U" l3 E8 }% A( n+ f - #define PBin(n) BIT_ADDR(GPIOB_IDR_Addr,n) //输入 ) ]9 ~+ e" d+ r% e
3 i* J# O: V9 {7 J0 I6 X- #define PCout(n) BIT_ADDR(GPIOC_ODR_Addr,n) //输出
+ H' Y% A7 f+ z; f$ L9 h - #define PCin(n) BIT_ADDR(GPIOC_IDR_Addr,n) //输入
* ^+ J& n; i q
) g) e. ]6 c+ ~, u7 j$ }: j2 G1 ?- #define PDout(n) BIT_ADDR(GPIOD_ODR_Addr,n) //输出
, h# y# X" N; g: ` - #define PDin(n) BIT_ADDR(GPIOD_IDR_Addr,n) //输入 % c- P( L) P0 N# p" D8 S
Q' g' h! B. M% H# O/ U. f- #define PEout(n) BIT_ADDR(GPIOE_ODR_Addr,n) //输出
; } `, ^8 A! D1 f* W' L$ K0 F - #define PEin(n) BIT_ADDR(GPIOE_IDR_Addr,n) //输入
; q% }: F! c( v0 U% e
' s9 J* P3 U$ E- #define PFout(n) BIT_ADDR(GPIOF_ODR_Addr,n) //输出
# F5 d9 ?3 O0 ~ - #define PFin(n) BIT_ADDR(GPIOF_IDR_Addr,n) //输入; w* a' H$ l6 Y' b( O l! Y+ m( `
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- #define PGout(n) BIT_ADDR(GPIOG_ODR_Addr,n) //输出 1 z! h1 G) I) d7 |% q P
- #define PGin(n) BIT_ADDR(GPIOG_IDR_Addr,n) //输入
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- #define PHout(n) BIT_ADDR(GPIOH_ODR_Addr,n) //输出
# Y# _1 r4 u9 E+ r8 g2 u - #define PHin(n) BIT_ADDR(GPIOH_IDR_Addr,n) //输入
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- #define PIout(n) BIT_ADDR(GPIOI_ODR_Addr,n) //输出 ( ~ v& I$ e. b
- #define PIin(n) BIT_ADDR(GPIOI_IDR_Addr,n) //输入9 X! m. n0 I) V. F
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+ C6 Z; k5 l0 m9 j5 M- #endif
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