本人学习STM32是直接通过操作stm32的寄存器,使用的开发板是野火ISO-V2版本; 先简单的介绍一下stm32的GPIO; stm32的GPIO有多种模式: 1.输入浮空 2.输入上拉 3.输入下拉 4.模拟输入 5.开漏输出 6.推挽式输出 7.推挽式复用功能 8.开漏复用功能 stm32GPIO模式设置相关寄存器设置的介绍
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stm32中文参考手册中对GPIO模式设置对应寄存器的详细介绍:2 x h" m9 f) E+ r: I
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& |, H# o* X( Y" w# e! U& L下图为开发板LED的接线图; & w# U F9 K- g- c/ m+ _+ G" b3 V
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根据上面的电路图可知,将GPIOB_0,GPIOF_7和GPIOF_8设置为低电平时,LED将被点亮; 程序代码: LED.h 文件 - #ifndef __LED_H% e& m% s! X& }0 ]* M, n, n# X
- #define __LED_H
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) K9 O v- N5 J( m3 @- void GPIO_Init(void);, `5 {+ n* ~3 O. i/ [# |/ r! D
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' a- |4 X4 V9 @0 z. y- #endif
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stm32.h 文件
9 ~' G. f4 Y! K+ L6 v. s8 a# m- #ifndef __STM32_H) ~3 |; L# v; ~. U* Y5 q
- #define __STM32_H: x9 P. ~0 ~0 `6 k3 A1 ~6 C" I! }
- 6 K2 ^6 _: c( U1 h. j3 h
- //引脚寄存器定义
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. R$ j. R& y; d& X1 j ?- //GPIO对应寄存器起始地址
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- #define GPIOA 0x40010800
/ J& T' ? d: i* y - #define GPIOB 0x40010C006 l) b+ D' {$ z
- #define GPIOC 0x40011000
- b; y6 K2 b% y2 y, m - #define GPIOD 0x40011400
7 A" {% t& b- Z - #define GPIOE 0x40011800
/ e) r/ n `2 q6 X& a* G+ e; L - #define GPIOF 0x40011C00+ h/ ~" l( b+ a
- #define GPIOG 0x40012000
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- //寄存器偏移地址
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2 g# g6 C8 C8 V* Z" w- #define GPIOx_CRL 0x00
$ q# X% \9 @6 ]4 o5 {1 I4 W( l- s' f - #define GPIOx_CRH 0x04- G8 J& Y2 L# M& m: I6 m1 w
- #define GPIOx_IDR 0x085 B! P% ~+ Z: a
- #define GPIOx_ODR 0x0c
" `/ q, ^8 m2 | n B - #define GPIOx_BSRR 0x101 h# [3 `$ _3 f' t- ~) q
- #define GPIOx_BRR 0x146 E3 D0 }) _; |" ]' d& a: g& R
- #define GPIOx_LCKR 0x18
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; F N9 }0 J I" q9 I- #define GPIOB_CRL *((volatile unsigned int *)(GPIOB + GPIOx_CRL))
% S* Y2 C5 D( G& C+ J" j8 } - #define GPIOB_CRH *((volatile unsigned int *)(GPIOB + GPIOx_CRH))9 x! r& n; U( ^6 L( d# o0 _2 w
- #define GPIOB_IDR *((volatile unsigned int *)(GPIOB + GPIOx_IDR))
+ U5 B$ {' l- R. V- B3 y. {9 o9 B - #define GPIOB_ODR *((volatile unsigned int *)(GPIOB + GPIOx_ODR))
6 P. ^( g6 V" g. n) u# |0 I - #define GPIOB_BSRR *((volatile unsigned int *)(GPIOB + GPIOx_BSRR))
- `$ H' k7 G2 F8 _1 T' q" I o8 E - #define GPIOB_BRR *((volatile unsigned int *)(GPIOB + GPIOx_BRR))
7 @/ Q/ l. H% K% z8 y - #define GPIOB_LCKR *((volatile unsigned int *)(GPIOB + GPIOx_LCKR))
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$ V& g) m7 j" ?: g- #define GPIOF_CRL *((volatile unsigned int *)(GPIOF + GPIOx_CRL))$ g/ T+ g1 ~; p
- #define GPIOF_CRH *((volatile unsigned int *)(GPIOF + GPIOx_CRH))
8 f: l: c* ?, `9 d - #define GPIOF_IDR *((volatile unsigned int *)(GPIOF + GPIOx_IDR))2 H' @: l9 W& M/ O" b, n
- #define GPIOF_ODR *((volatile unsigned int *)(GPIOF + GPIOx_ODR))# K+ t$ p) T/ J5 |6 s
- #define GPIOF_BSRR *((volatile unsigned int *)(GPIOF + GPIOx_BSRR))
1 a6 x- ?& G- |/ s/ m: w ^2 q - #define GPIOF_BRR *((volatile unsigned int *)(GPIOF + GPIOx_BRR)); |9 K) d- ~9 u" Y4 N
- #define GPIOF_LCKR *((volatile unsigned int *)(GPIOF + GPIOx_LCKR))! j8 z) A2 F) d) {) R
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- #endif
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9 V0 R3 t3 R3 u% i% Z( XLED.c 文件 - #include "LED.h"
+ q2 |4 w0 m& F2 {, Q - #include "stm32.h"0 z. F" O8 Z2 a1 ~6 t
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- void delay(unsigned int x)" b7 z3 ~! K! M4 v, l+ M3 H
- {
+ x' q- m; h1 e' n1 O v6 M% L - volatile int i, j;
6 T; ?2 C" R% B# n/ N' T - for(i = 0; i < x; i++)2 F* I8 A- P2 k& x
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- for(j = 0; j < 1000; j++);( k8 [6 j6 k' ^$ q' H$ B/ S' \" E+ F) p
- }
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9 Z# q) i O1 r |- void GPIO_Init(void)$ Y4 p1 G5 B |
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- //使能GPIOB和GPIOF的时钟0 p; N# c- `+ e
- RCC_APB2ENR |= 1 << 3;6 O2 d1 I% F/ F0 l
- RCC_APB2ENR |= 1 << 7;
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# ~" M+ l) ]0 A* ]- //清除GPIOB和GPIOF的配置寄存器$ i/ Q/ Z$ e/ ]( i
- GPIOB_CRL &= ~(0xf << 0);- N2 T4 F1 d+ e6 w
- GPIOF_CRL &= ~(0xf << 0);
+ {! o: l6 ]' j: z- b( Q+ Z - GPIOF_CRH &= ~(0xf << 0);8 c- p: {4 L. G' C x
8 s" Q9 V6 E0 C0 \) T- //配置GPIOB和GPIOF的端口为通用推挽输出,输出速度为50HZ7 ]6 n2 r q% U5 l3 h
- GPIOB_CRL |= 3 << 0;
$ t2 K) \/ f6 t7 \# b - GPIOF_CRL |= 3 << 28;
3 L$ p/ ~9 v% g# z+ p: D$ a O - GPIOF_CRH |= 3 << 0;
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- //设置GPIOB_0和GPIOF_7和GPIOF_8输出为高电平0 N: f( ^. m7 T/ g" l
- GPIOB_ODR |= 1 << 0;
. S1 p5 x8 P8 {8 A5 n - GPIOF_ODR |= 3 << 7;
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2 X3 ]3 X# \" z; A- int main(void)* } E+ I( K' H7 W4 b
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- GPIO_Init();1 X& b- o$ ?4 J1 v/ G3 S% g
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- GPIOB_ODR &= ~(1 << 0); //设置GPIOB_0端口输出为低电平1 [& z+ i: Z3 J$ e' \
- GPIOF_ODR &= ~(3 << 7); //设置GPIOF_7和GPIOF_8输出为低电平
2 \5 L; e! h, y9 y' W - while(1)
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) [. `! f. z2 y$ B/ z2 `6 ^ - GPIOB_ODR &= ~(1 << 0); //设置GPIOB_0端口输出为低电平
7 D) b8 V( ?( L7 B - GPIOF_ODR |= 3 << 7; //设置GPIOF_7和GPIOF_8输出为高电平
n- B4 W, N' B( r, G. a - delay(100);
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% g& f& P8 _, S6 P6 G4 m- GPIOB_ODR |= 1 << 0; //设置GPIOB_0端口输出为高电平1 @/ i; Y- Y% z. ~. T# r/ S
- GPIOF_ODR &= ~(1 << 7); //设置GPIOF_7输出为低电平
2 X6 d$ P; n) m - delay(100);; Q- l) W: @4 g4 ]
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- GPIOF_ODR &= ~(1 << 8); //设置GPIOF_7输出为高电平
, E/ }4 Q% ]# {* E- }1 X - GPIOF_ODR |= 1 << 7; //设置GPIOF_8输出为低电平
% e+ h# U1 x. a - delay(100);
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- }
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程序将实现流水灯的效果; 在使用GPIO时一定要将相应GPIO的时钟开启; 3 S# z, e/ `+ r) d! }0 K& n
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