STM32F407ZE开发板实现使用串口USART1接收、发送字符串实例
) P* w/ H" H$ Q6 D2 ^6 a0 l+ J. {+ _具体代码及解析如下:
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" ?8 B0 N9 V) M4 Umain.c部分% U4 U: D. ]$ d; X& }, X, g
& r9 `8 o9 k3 q, g3 s- #include <stm32f4xx.h> ( z# l% P' F7 U' z
- #include "led.h"
n' M& p: f. g - #include "ustart.h"* |( i5 M8 b" D( j" E* a
- #include <string.h>( Z( V4 a( L9 G* s% |3 ~ z4 B+ w
# k5 k3 l4 B2 s4 ~& P4 s5 ~- int main()
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- LED_Init();* j* `- ]# O! x3 d7 l: v
- USART1_Init(); J- s& ?4 q7 f v8 ~
- 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)
9 L" z/ k3 p1 W) O+ M- D - Receive_Flag = 0; //接收数据标志位置0(可以开始接收)
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2 n. S8 E, e$ J+ Q4 ?* gustart.h部分, m- Q% M& o1 J% c
7 F7 `+ w7 c" { y* B {8 N- #ifndef USTART_H7 g6 r6 l9 w& ?, H$ F) r* B% n. h: {
- #define USTART_H
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4 t4 s+ Q6 M R0 N3 @- #include <stm32f4xx.h>. ~$ A* w! a$ L( d" [( Q4 e
- #include <stm32f4xx_usart.h># L ?" D8 h7 X- I! H
- #include <stdio.h>
6 n/ B! ^9 C0 `# f! ?2 { - #include "sys.h"" m8 r7 \! r E6 [( ~6 p
: S! d# [" K9 ~0 W2 \- extern char USART1_ReceiveData[50]; //接收PC端发送过来的字符" ]% Y7 q4 F" C/ T% I" V* `
- extern int Receive_Flag;
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7 r5 |8 m0 Y3 v( @+ D# S& O- void USART1_Init();
7 V! m& v% R+ C/ c - void USART_SendString(USART_TypeDef* USARTx, char *DataString);- p, A' d4 q9 @+ E* g" _
- #endif
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ustart.c部分
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% n, [# X9 B+ A$ h ~- #include "ustart.h"* K7 r- M- J% {
- #include <string.h>) z0 ^' P0 e" l; M5 j' d$ t
+ l$ Q" ], M) [/ I5 V( e9 S- int fputc(int ch, FILE *f)
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- /* 发送一个字节数据到串口 */
+ {( D: X5 t( \$ g& N5 z4 ^ - 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* S8 a8 b9 ]7 B& [ - /* 等待发送完毕 */
2 {4 T u1 D& z \ - while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);9 ]4 n& B; C# a0 ^9 ~
- return (ch);
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7 e7 O8 s9 A1 J4 P8 ~. p1 r+ b- void USART1_Init()
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% `8 V6 {. J" s. @% ~ - GPIO_InitTypeDef GPIOInit_Struct;
" D0 `) y- k8 {8 t6 x8 n - USART_InitTypeDef USARTInit_Struct;9 T$ m+ _3 X" Z6 v) J- R
- NVIC_InitTypeDef USARTNVIC_Struct;- W1 g3 O& n4 `+ N5 y2 ^0 j: e& o
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- //1、使能时钟5 f+ v' a6 _2 }6 J
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);5 N0 Y' |+ U7 M/ u/ t/ d9 X- a: K
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- //2、初始化对应的IO引脚复用为USART1功能6 p9 Y1 L' T& X' a! Y
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);- h; |- Q4 x# b( s& l
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- GPIOInit_Struct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
9 ]0 `0 B; t% u$ G5 o1 Z; M9 Q - GPIOInit_Struct.GPIO_Mode = GPIO_Mode_AF;/ {( I0 Z1 }, _, a5 d
- GPIOInit_Struct.GPIO_OType = GPIO_OType_PP;
2 \# \' [! ^" x2 p5 K - GPIOInit_Struct.GPIO_Speed = GPIO_Fast_Speed;
6 o' O8 C0 o+ X1 E9 f( F - GPIOInit_Struct.GPIO_PuPd = GPIO_PuPd_UP;
7 i# i1 @4 C2 g/ S" f - GPIO_Init(GPIOA,&GPIOInit_Struct);" R# V/ G4 F( o# ^7 u
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- //将PA9 PA10复用为USART1功能
1 d' U% `- h& E2 e/ G' e, g$ q - GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
! ~, c3 v2 W) x* j- u9 V3 E - GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);& b! g# k5 `2 I) j$ F; e+ w+ F
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6 ^' N8 j0 x: j - //3、USART1初始化 `8 `- i# @5 \" x) y7 ?+ X
- USARTInit_Struct.USART_BaudRate = 115200; //波特率6 T' ~4 Z/ w& i7 _- t- D& e1 v
- USARTInit_Struct.USART_Parity = USART_Parity_No; //无校验位' G; ]* ]% ]( [8 D5 R* P
- USARTInit_Struct.USART_StopBits = USART_StopBits_1; //1位停止位
) z- v$ ^8 I/ f3 F - USARTInit_Struct.USART_WordLength = USART_WordLength_8b; //8位数据位
3 S, f$ X, u( L- S+ T% n - USARTInit_Struct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
" I) E/ L) X2 n7 s - USARTInit_Struct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件控制流
9 U: p7 k8 @; ^. i6 V4 m) E - USART_Init(USART1,&USARTInit_Struct);
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- //开启串口终端7 N" m3 `$ ^- Q8 ~! d; F
- USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
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( y! y: i* k0 b6 p$ H0 i7 Y# C1 g - USARTNVIC_Struct.NVIC_IRQChannel = USART1_IRQn;//stm32f4xx.h* G' S2 E" O9 p7 y6 N
- USARTNVIC_Struct.NVIC_IRQChannelPreemptionPriority = 0;: l( m" n# L3 E; q
- USARTNVIC_Struct.NVIC_IRQChannelSubPriority = 0;7 y# N& z+ r& W- S& J* M' z a
- USARTNVIC_Struct.NVIC_IRQChannelCmd = ENABLE;
, e& D3 v7 l; [- T6 I) z6 r. J9 f - NVIC_Init(&USARTNVIC_Struct);5 K' l- x+ X4 I
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- //4、开启串口
" q0 O9 @) _- S. I$ [* X# p - USART_Cmd(USART1,ENABLE);
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- void USART_SendString(USART_TypeDef* USARTx, char *DataString)* u% D( Q3 P) `% |% Q. V, h5 u
- {
3 T* Z$ T' \5 ^ - int i = 0;
+ ~, U1 \; {" j- X - 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)6 R3 R# F: j9 n O5 w
- while(DataString<i> != '\0') //字符串结束符" Q( ^: } _1 q: s1 _' @1 K7 I
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- USART_SendData(USARTx,DataString<i>); //每次发送字符串的一个字符4 e) P% y$ h1 W: M
- while(USART_GetFlagStatus(USARTx,USART_FLAG_TC) == 0); //等待数据发送成功: a+ W* [4 j2 _' X1 }1 q
- USART_ClearFlag(USARTx,USART_FLAG_TC); //发送字符后清空标志位6 `% F6 d) _% F
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- }
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- char USART_ReceiveString[50]; //接收PC端发送过来的字符) [3 l4 ~3 k$ ?
- int Receive_Flag = 0; //接收消息标志位! u! ]8 B' g7 G0 Y; ?: c0 n$ x
- int Receive_sum = 0; //数组下标! \ v" [5 Y' C- P( n
- void USART1_IRQHandler(void)5 E2 b, T2 C1 A; ^8 X9 k. C
- {
- b$ b, F$ X3 J' a( Q/ u3 c - if(USART_GetITStatus(USART1,USART_IT_RXNE) == 1) //USART_FLAG_RXNE判断数据,== 1则有数据
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" V, ?# ~5 N# W$ N! g9 g% L, a - if(Receive_sum > 49) //数组能存放50个字节的数据
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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 % M2 E; ]3 a. p' l/ _
- Receive_Flag = 1; //接收标志位置1,停止接收数据% s) O3 f$ n( L7 S
- 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
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! @3 m1 o, J1 F) | w8 I, l! t - USART_ReceiveString[Receive_sum] = USART_ReceiveData(USART1); //通过USART1串口接收字符+ @& z; ?' O' ~: `9 Z+ A" @
- Receive_sum++; //数组下标++
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- if(Receive_sum >= 2) //数组下标大于2
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- if(USART_ReceiveString[Receive_sum-2] == '\r' && USART_ReceiveString[Receive_sum-1] == '\n' )
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- USART_ReceiveString[Receive_sum-1] = '\0'; # f- S2 ~6 W) P/ x$ f; V
- USART_ReceiveString[Receive_sum-2] = '\0';7 C' f- z" h c
- Receive_Flag = 1; //接收标志位置1,停止接收数据
" }7 s5 Y* d$ y( u/ ~8 t - Receive_sum = 0; //数组下标置0 \% `: N7 X0 B0 j; ^" J E( w
- printf("%s\r\n",USART_ReceiveString);
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7 Z7 _! `. {: e8 e6 \1 S0 H- if(strcmp(USART_ReceiveString,"hello") == 0)
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- PFout(9) = !PFout(9);+ H( X% [3 U6 ^! D7 c) K. d2 V2 F
- }
0 e, ^% V4 M. F7 u0 t - if(strcmp(USART_ReceiveString,"world") == 0)3 N f. Y" j3 q$ j
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- PFout(10) = !PFout(10);
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5 P" S6 m' c6 k7 b- C# d) o( M - if(strcmp(USART_ReceiveString,"jiajia") == 0)
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- g3 I5 {+ ~& I G- J; l3 u - PEout(13) = !PEout(13);
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- if(strcmp(USART_ReceiveString,"haha") == 0)- U' P0 a7 Q, w6 e7 ?1 \
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- PEout(14) = !PEout(14);
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- }
6 p) D2 |+ _3 M. `$ D0 n$ Y' e( J( r' o - USART_ClearITPendingBit(USART1,USART_IT_RXNE); //接收后先清空标志位
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led.h部分+ ~) K8 b$ _3 B8 C
l5 f- M( I* i( W) K- #ifndef _LED_H_
) A/ ?7 a! l( v0 m; G1 V! D - #define _LED_H_* s1 y+ m# u2 |* u* Z# x1 \
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- #include <stm32f4xx.h>/ J: }% T) g% g, X
- #include "sys.h"
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3 @3 d* r# F$ Q1 i, a- void LED_Init(void);
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- #endif
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4 \' h. R1 j5 Y6 w, Oled.c部分3 z' ?5 W; v: i
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- #include "led.h"
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- void LED_Init(void): y2 n g" `8 g" Q x
- {
, X2 r l7 ~7 x1 J: I - GPIO_InitTypeDef aaa;
# i V/ Q( E7 A) {$ {! n" e - : K) M2 R7 h- C% \) U3 \+ y
- //1、先开启对应用到的模块时钟节拍8 l$ y3 I r8 v# ~
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF,ENABLE);& ^: a& W* t. A& t
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE,ENABLE);//PE组时钟
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% s) W9 d+ A( H! I& x- //2、可以初始化配置GPIO F组的9号引脚; O2 G' e7 x$ n6 b
- aaa.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
8 ~& B+ S/ g+ M. x* ~0 Z5 t - aaa.GPIO_Mode = GPIO_Mode_OUT;//输出模式
9 U' q8 e: Y6 \; M) r' y$ { - aaa.GPIO_Speed = GPIO_Fast_Speed;//快速 点灯和引脚速度无关3 u: k, Y- h @1 j$ s: W/ ?
- aaa.GPIO_OType = GPIO_OType_PP;//推挽输出& U# L# U: G2 a% f. `# {# |2 G
- aaa.GPIO_PuPd = GPIO_PuPd_UP;//内部上拉- N5 r b x9 W+ Y2 p' S. S; k* }
- GPIO_Init(GPIOF,&aaa);
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- aaa.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;: a0 \4 _1 F* B$ `
- GPIO_Init(GPIOE,&aaa);
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9 e n$ C3 `0 c5 P4 K! r3 @% Q( C - //初始化完成 灭掉4盏灯0 E9 z* p3 g* h6 V% M
- PFout(9) = 1;
6 ] `8 ~2 h) K2 a1 r - PFout(10) = 1;
" _$ [1 G5 C8 N& w- k5 B+ ~ - PEout(13) = 1;* |4 Z; m; x! k, W% A' F
- PEout(14) = 1;. V4 c3 |" W" Q2 f7 o8 G( K2 X
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; a1 B" \% e; Qsys.h部分- }: k) H% R$ _6 F7 ?9 }
3 c" \/ [, t8 j0 z- Z- #ifndef __SYS_H
, A3 Z. p1 {7 I( } E0 b" @4 z - #define __SYS_H
+ E' w( H5 U3 Q: w7 ^6 s - #include "stm32f4xx.h"
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; Q8 B( @5 f. C! v5 R' M- //IO口操作宏定义+ e' m, }6 \' T" }" ?# Z
- #define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr & 0xFFFFF)<<5)+(bitnum<<2))
% }# w( x. p: c) X1 s- f - #define MEM_ADDR(addr) *((volatile unsigned long *)(addr))
7 Z1 b) l. Q" s& E- k- j! Q" o - #define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum)) / H/ ~0 ^- n4 E+ W$ ~+ j& v
- //IO口地址映射$ H% w. N: T6 E; m2 X6 W
- #define GPIOA_ODR_Addr (GPIOA_BASE+20) //0x400200140 @3 {* E, }; f' H. m1 Q
- #define GPIOB_ODR_Addr (GPIOB_BASE+20) //0x40020414 9 l0 E# P" r. a" m! b
- #define GPIOC_ODR_Addr (GPIOC_BASE+20) //0x40020814
7 E8 b' G& K7 P: ^# K6 W - #define GPIOD_ODR_Addr (GPIOD_BASE+20) //0x40020C14 ; p" N. `% e; K' q
- #define GPIOE_ODR_Addr (GPIOE_BASE+20) //0x40021014 2 J1 D. A* l% a7 s% D8 L% {( h9 x
- #define GPIOF_ODR_Addr (GPIOF_BASE+20) //0x40021414 + S( e$ C# W9 I6 u: e$ j' F
- #define GPIOG_ODR_Addr (GPIOG_BASE+20) //0x40021814 # K& b: S3 d; y1 O8 t+ R
- #define GPIOH_ODR_Addr (GPIOH_BASE+20) //0x40021C14 9 {5 g2 B" T# W3 w( L. r+ k
- #define GPIOI_ODR_Addr (GPIOI_BASE+20) //0x40022014 ! K2 D* x1 H$ g9 P/ w, c ]
- % U6 b" q2 J: A2 x* {
- #define GPIOA_IDR_Addr (GPIOA_BASE+16) //0x40020010 : s, V) ~: {0 z# K9 _, ]. K8 Q
- #define GPIOB_IDR_Addr (GPIOB_BASE+16) //0x40020410
. T: x( i$ N( |5 G, Z0 l - #define GPIOC_IDR_Addr (GPIOC_BASE+16) //0x40020810
2 e: x! U3 [. J* e8 w5 | - #define GPIOD_IDR_Addr (GPIOD_BASE+16) //0x40020C10
w- a$ p9 F" }( ], Y. M - #define GPIOE_IDR_Addr (GPIOE_BASE+16) //0x40021010 + _6 B/ k% I% f( X. L( w+ N
- #define GPIOF_IDR_Addr (GPIOF_BASE+16) //0x40021410 % A4 \. |) J4 p) T" q
- #define GPIOG_IDR_Addr (GPIOG_BASE+16) //0x40021810 0 J# l* Y" J3 w7 c6 [3 j( L7 {
- #define GPIOH_IDR_Addr (GPIOH_BASE+16) //0x40021C10
$ O8 ^7 }2 k t( `: b - #define GPIOI_IDR_Addr (GPIOI_BASE+16) //0x40022010 0 R7 |& g6 t G* N0 w. F
/ e" K V4 o' z6 z7 _' r- //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3 y+ J$ W; A6 e1 o( A
- //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 ! @. v. k7 Z2 V/ Y
- //IO口操作,只对单一的IO口!4 p' |/ I: Y2 q8 v E! ]% F# G7 v# \
- //确保n的值小于16!$ h2 a* ]% t1 M9 m9 M+ t
- #define PAout(n) BIT_ADDR(GPIOA_ODR_Addr,n) //输出 9 T H& K' X% {- {: g" I
- #define PAin(n) BIT_ADDR(GPIOA_IDR_Addr,n) //输入
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" Y+ W0 C' ^2 a' l. r& l# I4 ^9 E% G- #define PBout(n) BIT_ADDR(GPIOB_ODR_Addr,n) //输出
, k( L3 [2 S4 h+ b/ ~ - #define PBin(n) BIT_ADDR(GPIOB_IDR_Addr,n) //输入 $ s A& q: a1 ~# G3 ` k- d" x% @
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- #define PCout(n) BIT_ADDR(GPIOC_ODR_Addr,n) //输出 ! V& o5 h3 ]8 I$ y5 y$ R
- #define PCin(n) BIT_ADDR(GPIOC_IDR_Addr,n) //输入
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/ a. s4 y; a3 Q, [$ O( [- #define PDout(n) BIT_ADDR(GPIOD_ODR_Addr,n) //输出 & ~6 h! l1 T0 h$ Y
- #define PDin(n) BIT_ADDR(GPIOD_IDR_Addr,n) //输入
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* F2 Y7 b# e/ ], j @- #define PEout(n) BIT_ADDR(GPIOE_ODR_Addr,n) //输出 : h) C% N6 {: u5 A8 q
- #define PEin(n) BIT_ADDR(GPIOE_IDR_Addr,n) //输入
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- #define PFout(n) BIT_ADDR(GPIOF_ODR_Addr,n) //输出 ; \$ d3 a* w0 T. Y' m
- #define PFin(n) BIT_ADDR(GPIOF_IDR_Addr,n) //输入. i/ @- R* g8 ~& |) C
- ; m+ l3 q, R/ h9 B$ u) [
- #define PGout(n) BIT_ADDR(GPIOG_ODR_Addr,n) //输出
& l Z6 e8 P2 {. L6 S. \ - #define PGin(n) BIT_ADDR(GPIOG_IDR_Addr,n) //输入2 L( c/ {7 [5 R2 S4 ^
- / q# ^+ }3 x- d
- #define PHout(n) BIT_ADDR(GPIOH_ODR_Addr,n) //输出
& |' T" f' s. \7 E3 c/ R - #define PHin(n) BIT_ADDR(GPIOH_IDR_Addr,n) //输入5 B4 w0 `% n2 P. M' v/ j; r
5 _' l' h# }& _7 P- #define PIout(n) BIT_ADDR(GPIOI_ODR_Addr,n) //输出 9 o- h b! u, w" g
- #define PIin(n) BIT_ADDR(GPIOI_IDR_Addr,n) //输入% U: R5 f" _9 O3 K1 W2 V' a
- 9 P3 W& l0 k. a% _
- 1 M4 f: P& P7 H9 N+ a
- #endif
复制代码 9 l. n$ @# m* a7 }, Y+ {
# J# i) }4 m, d* M9 ~————————————————
0 w/ m% ]2 d* W' N版权声明:佳佳鸽* e* m8 i! o' T& Y3 a; S
u# m$ G$ }3 @7 l |