MyStm32Code/DOC/28_object_oriented_encapsulation.md

面向对象封装

以LED为例

调用

外部引用结构体实例化 头文件 #include "led.h" extern struct led led_g; extern struct led led_r;

源程序文件 struct led led_g; struct led led_r;

状态相关的枚举 无需额外引入

代码

#ifndef __LED_H
#define __LED_H

#include "stdint.h"
#include "main.h"
#define LED_MAX_NUM 4

// 回调需要这个参数，控制时开关还是闪烁，闪烁快慢
enum led_state{
   LED_STATE_ON,
   LED_STATE_FLICKER_SLOW,
   LED_STATE_FLICKER_MEDIUM,
   LED_STATE_FLICKER_QUICK,
   LED_STATE_OFF

};

// 标准库的 GPIO_TypeDef, 改为HAL库
struct led
{
   enum led_state state;
   GPIO_TypeDef *gpio;
   uint16_t pin;
   uint16_t level_on;
};

//  依据GPIO 信息注册
int led_register(struct led *led, GPIO_TypeDef *gpio, uint16_t pin, enum led_state state, uint16_t level_on );

// 初始化状态
int led_set_state(struct led *led,enum led_state state);

// 执行  -- 由状态决定
void led_callback(void);
#endif

#include "led.h"

static struct led *led_table[LED_MAX_NUM];
static uint32_t p_led_table=0;
/**
* @brief 注册LED灯
* 
* @param led struct led 结构指针
* @param gpio LED所在的GPIO
* @param pin LED所在的引脚
* @param state LED初始状态
* @param level_on LED点亮时的电平 1:高 0:低
* @return int 0:成功 非0:失败
*/
int led_register(struct led *led,GPIO_TypeDef *gpio,uint16_t pin,enum led_state state,uint16_t level_on)
{
  if(p_led_table>=LED_MAX_NUM-1){
      return -1;
  }
  led->gpio=gpio;
  led->pin=pin;
  led->state=state;
  led->level_on=level_on;
  led_table[p_led_table++]=led;
  return 0;
}
/**
* @brief 设置LED状态
* 
* @param led struct led 结构指针
* @param state LED状态
* @return int 0:成功
*/
int led_set_state(struct led *led,enum led_state state)
{
  led->state=state;
  return 0;
}
/**
* @brief led回调函数 每100ms调用一次
* 
*/
void led_callback(void)
{
  int i;
  static uint32_t tick_con=0;
  tick_con++;
  for(i=0;i<p_led_table;i++){
      switch (led_table[i]->state)
      {
      case LED_STATE_OFF:
          HAL_GPIO_WritePin( led_table[i]->gpio,led_table[i]->pin,(~led_table[i]->level_on)&1 );
          // GPIO_WriteBit(led_table[i]->gpio,led_table[i]->pin,(~led_table[i]->level_on)&1);
          break;
      case LED_STATE_ON:
          HAL_GPIO_WritePin( led_table[i]->gpio,led_table[i]->pin,led_table[i]->level_on&1 );
          // GPIO_WriteBit(led_table[i]->gpio,led_table[i]->pin,led_table[i]->level_on&1);
          break;
      case LED_STATE_FLICKER_QUICK:
          HAL_GPIO_TogglePin(  led_table[i]->gpio,led_table[i]->pin);
          // GPIO_WriteBit(led_table[i]->gpio,led_table[i]->pin,!GPIO_ReadOutputDataBit(led_table[i]->gpio,led_table[i]->pin));
          break;
      case LED_STATE_FLICKER_MEDIUM:
          if((tick_con&0x01)==0){
              HAL_GPIO_TogglePin(  led_table[i]->gpio,led_table[i]->pin);
              // GPIO_WriteBit(led_table[i]->gpio,led_table[i]->pin,!GPIO_ReadOutputDataBit(led_table[i]->gpio,led_table[i]->pin));
          }
          break;
      case LED_STATE_FLICKER_SLOW:
          if((tick_con&0x03)==0){
              HAL_GPIO_TogglePin(  led_table[i]->gpio,led_table[i]->pin);
              // GPIO_WriteBit(led_table[i]->gpio,led_table[i]->pin,!GPIO_ReadOutputDataBit(led_table[i]->gpio,led_table[i]->pin));
          }
          break;
      default:
          break;
      }
  }
}