初学stm32之封装GPIO口

    经过两天的学习，我发现对于stm32来讲它的GPIO口在配置过程中一些代码复用率非常高，所以就对GPIO口的使用（通用型输出和普通型输入）进行封装，进而加快系统的设计。此文章主要是对LED灯，独立按键，蜂鸣器进行模块化编程，还望对大家有所帮助，请参考电路图查看代码。




1    gpio.h#include "gpio.h"

//GPIO初始化，GPIOx的第Pin位，Mode 1 输入，Mode 0 输出
void Gpio_Init(GPIO_TypeDef * GPIOx, uint8_t Pin, uint8_t Mode)
{
switch(Mode)
{
case 1:
GPIOx->MODER &=~ (3<<(Pin+Pin));
GPIOx->PUPDR &=~ (3<<(Pin+Pin));
break;
case 0:
GPIOx->MODER &=~ (3<<(Pin+Pin));
GPIOx->MODER |= (1<<(Pin+Pin));
GPIOF->OTYPER &=~ (1<<Pin);
GPIOx->OSPEEDR |= (3<<(Pin+Pin));
GPIOx->PUPDR &=~ (3<<(Pin+Pin));
break;
default: break;
}
}

void Led_Init(void)
{
RCC->AHB1ENR |= (9<<2); //开启GPIOF与GPIOC时钟
Gpio_Init(GPIOF,6,0);
Gpio_Init(GPIOF,9,0);
Gpio_Init(GPIOF,10,0);
Gpio_Init(GPIOC,0,0);
//初始化时关闭所有灯
GPIOF->ODR |= (1<<6);
GPIOF->ODR |= (1<<9);
GPIOF->ODR |= (1<<10);
GPIOC->ODR |= (1<<0);
}

void Beep_Init(void)
{
RCC->AHB1ENR |= (1<<5);
Gpio_Init(GPIOF,8,0);
}

//按键初始化 key1与PA0相连，key2-key4与PE2-PE3对应相连
void Key_Init(void)
{
RCC->AHB1ENR |= (1<<0);//开启GPIOA时钟
RCC->AHB1ENR |= (1<<4);
Gpio_Init(GPIOA,0,1);
Gpio_Init(GPIOE,2,1);
Gpio_Init(GPIOE,3,1);
Gpio_Init(GPIOE,4,1);
}

2    gpio.h#ifndef GPIO_H
#define GPIO_H

#include "stm32f4xx.h"

//LED反转
#define LED1_TOGGLE() GPIOF->ODR ^= (1<<6)
#define LED2_TOGGLE() GPIOF->ODR ^= (1<<9)
#define LED3_TOGGLE() GPIOF->ODR ^= (1<<10)
#define LED4_TOGGLE() GPIOC->ODR ^= (1<<0)
#define BEEP_TOGGLE() GPIOF->ODR ^= (1<<8)

//LED亮灭
#define LED1(x) x?(GPIOF->ODR &=~ (1<<6)):(GPIOF->ODR |= (1<<6))
#define LED2(x) x?(GPIOF->ODR &=~ (1<<9)):(GPIOF->ODR |= (1<<9))
#define LED3(x) x?(GPIOF->ODR &=~ (1<<10)):(GPIOF->ODR |= (1<<10))
#define LED4(x) x?(GPIOC->ODR &=~ (1<<0)):(GPIOC->ODR |= (1<<0))
#define BEEP(x) x?(GPIOF->ODR |= (1<<8)):(GPIOF->ODR &=~ (1<<8))

//按键判断
#define KEY1() (GPIOA->IDR & (1<<0))
#define KEY2() !(GPIOE->IDR & (1<<2))
#define KEY3() !(GPIOE->IDR & (1<<3))
#define KEY4() !(GPIOE->IDR & (1<<4))

void Led_Init(void);
void Key_Init(void);
void Beep_Init(void);

#endif
3    main.c/**********************************************************
*————————————————————按键控制LED1灯————————————————————————
* 里面包含两种消抖处理的方式，为入门级别学习
* 按键按下的时候蜂鸣器发出响声，同时LED1的亮灭发生转变
***********************************************************/

#include "main.h"

void delay_ms(uint32_t ms)
{
uint64_t Time = ms * 16800;
while(Time--);
}

void delay_us(uint32_t us)
{
uint64_t Time = us * 16.8f;
while(Time--);
}

int main(void)
{
uint16_t i = 0;
uint16_t count = 0;
Led_Init();
Beep_Init();
Key_Init();
BEEP(0);
while (1)
{
// 注释部分为第一种按键处理方式
// if(KEY1())
// {
// delay_ms(10);
// if(KEY1())
// {
// BEEP(1);
// LED1_TOGGLE();
// }
// while(KEY1());
// BEEP(0);
// }

delay_ms(1);
i++;
if(i>10)
{
if(KEY1())
{
count++;
}
else
{
count = 0;
BEEP(0);
}
if(count > 20)
{
BEEP(1);
LED1_TOGGLE();
count = 0;
while(KEY1());
}
i = 0;
}
}
}

#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

/* Infinite loop */
while (1)
{
}
}
#endif

/**
* @}
*/

/**
* @}
*/

/************************ (C) COPYRIGHT HOLMES *****END OF FILE****/