在實際的項目開發(fā)過程中，常常會遇到硬件電路的修改，然后修改的部分就需要修改驅(qū)動程序。想這樣需求該來該去是程序員們最煩悶的事情（重復(fù)勞動痛不欲生啊~）。為了避免或減少重復(fù)勞動，就需要在程序的架構(gòu)上下功夫。接下來以最常見的KEY驅(qū)動程序為例，進(jìn)行程序結(jié)構(gòu)設(shè)計。

1，開發(fā)環(huán)境

1，固件庫：STM32F4xx_DSP_StdPeriph_Lib_V1.8.0

2，編譯器：ARMCC V5.06

3，IDE：Keil uVision5

4，操作系統(tǒng)：Windows 10 專業(yè)版

2，程序源碼

KEY.h文件

/**

******************************************************************************

* @file KEY.h

* @author XinLi

* @version v1.0

* @date 24-October-2017

* @brief Header file for KEY.c module.

******************************************************************************

* @attention

*

*

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see .

*

******************************************************************************

*/

#ifndef __KEY_H

#define __KEY_H

#ifdef __cplusplus

extern "C" {

#endif

/* Header includes -----------------------------------------------------------*/

#include "stm32f4xx.h"

/* Macro definitions ---------------------------------------------------------*/

#define KEYn (3)

#define KEY1_RCC_AHB1Periph_GPIO RCC_AHB1Periph_GPIOC

#define KEY1_GPIO GPIOC

#define KEY1_GPIO_Pin GPIO_Pin_2

#define KEY2_RCC_AHB1Periph_GPIO RCC_AHB1Periph_GPIOC

#define KEY2_GPIO GPIOC

#define KEY2_GPIO_Pin GPIO_Pin_3

#define KEY3_RCC_AHB1Periph_GPIO RCC_AHB1Periph_GPIOC

#define KEY3_GPIO GPIOC

#define KEY3_GPIO_Pin GPIO_Pin_4

#define KEY_RCC_APB1Periph_TIM RCC_APB1Periph_TIM2

#define KEY_TIM TIM2

#define KEY_TIM_Prescaler (83) /*!< Clock divided to 1MHz. */

#define KEY_TIM_Period (4999) /*!< 5ms timer interrupt. */

#define KEY_TIM_IRQn TIM2_IRQn

#define KEY_TIM_IRQHandler TIM2_IRQHandler

#define KEY_TIM_IRQ_PreemptionPriority (0)

#define KEY_TIM_IRQ_SubPriority (0)

#define KEY_PRESS_STATUS Bit_SET

/* Type definitions ----------------------------------------------------------*/

typedef enum

{

KEY_Pin1 = 0,

KEY_Pin2 = 1,

KEY_Pin3 = 2

}KEY_Pin;

typedef enum

{

KEY_NoPress = 0,

KEY_ShortPress = 1,

KEY_LongPress = 2

}KEY_Status;

/* Variable declarations -----------------------------------------------------*/

/* Variable definitions ------------------------------------------------------*/

/* Function declarations -----------------------------------------------------*/

void KEY_Init(void);

void KEY_DeInit(void);

KEY_Status KEY_GetStatus(KEY_Pin pin);

void KEY_SetShortPressCallback(KEY_Pin pin, void (*fun)(void));

void KEY_SetLongPressCallback(KEY_Pin pin, void (*fun)(void));

void KEY_ClearShortPressCallback(KEY_Pin pin);

void KEY_ClearLongPressCallback(KEY_Pin pin);

/* Function definitions ------------------------------------------------------*/

#ifdef __cplusplus

}

#endif

#endif /* __KEY_H */

KEY.c文件

/**

******************************************************************************

* @file KEY.c

* @author XinLi

* @version v1.0

* @date 24-October-2017

* @brief KEY module driver.

******************************************************************************

* @attention

*

*

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see .

*

******************************************************************************

*/

/* Header includes -----------------------------------------------------------*/

#include "KEY.h"

#include

/* Macro definitions ---------------------------------------------------------*/

/* Type definitions ----------------------------------------------------------*/

/* Variable declarations -----------------------------------------------------*/

/* Variable definitions ------------------------------------------------------*/

static GPIO_TypeDef *KEY_GPIO[KEYn] = {KEY1_GPIO, KEY2_GPIO, KEY3_GPIO};

static uint16_t KEY_GPIO_Pin[KEYn] = {KEY1_GPIO_Pin, KEY2_GPIO_Pin, KEY3_GPIO_Pin};

static uint32_t KEY_RCC_AHB1Periph_GPIO[KEYn] = {KEY1_RCC_AHB1Periph_GPIO, KEY2_RCC_AHB1Periph_GPIO, KEY3_RCC_AHB1Periph_GPIO};

static __IO int keyInputHighCount[KEYn] = {0};

static __IO int keyInputLowCount[KEYn] = {0};

static __IO KEY_Status keyStatus[KEYn] = {KEY_NoPress, KEY_NoPress, KEY_NoPress};

static __IO KEY_Status keyGetStatus[KEYn] = {KEY_NoPress, KEY_NoPress, KEY_NoPress};

static __IO void (*keyShortPressCallback[KEYn])(void) = {NULL};

static __IO void (*keyLongPressCallback[KEYn])(void) = {NULL};

/* Function declarations -----------------------------------------------------*/

/* Function definitions ------------------------------------------------------*/

/**

* @brief Key initializes.

* @param None.

* @return None.

*/

void KEY_Init(void)

{

for(int i = 0; i < KEYn; i++)

{

GPIO_InitTypeDef GPIO_InitStructure = {0};

RCC_AHB1PeriphClockCmd(KEY_RCC_AHB1Periph_GPIO[i], ENABLE);

GPIO_InitStructure.GPIO_Pin = KEY_GPIO_Pin[i];

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_Init(KEY_GPIO[i], &GPIO_InitStructure);

keyInputHighCount[i]