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本文为百问网&韦东山【物联网智能家居实战训练营】课程笔记
声明:本项目参考:MultiButton
1 CubeMX配置
- RCC:配置HSE为晶体/陶瓷谐振器
- SYS:Debug选择SW模式
- 时钟:选择HSE作为PLL时钟源,将其改为8MHz(默认),然后选择PLLCLK作为系统时钟源,设为系统时钟为72MHz
- 按键引脚:PA0(wk_up)下拉输入,PA15(key1)和PC5(key0)上拉输入
- LED引脚:PA8(红灯)和PD2(黄灯)设为推挽输出,默认输出高电平
- TIM6:向上计数模式(TIM6&7只支持向上计数),psc = 72 - 1,arr = 1000 - 1,即1ms更新中断,然后配置NVIC使能TIM6全局中断
- USART1:TX-PA9,RX-PA10,用于打印按键触发事件信息
- 以单独的c/h文件生成MDK工程
2 按键管理框架
2.1 按键驱动层
按键底层驱动通过CubeMX配置相应引脚GPIO模式,然后调用HAL库初始化:
void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
GPIO_InitStruct.Pin = WKUP_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLDOWN;
HAL_GPIO_Init(WKUP_GPIO_Port, &GPIO_InitStruct);
GPIO_InitStruct.Pin = KEY0_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLUP;
HAL_GPIO_Init(KEY0_GPIO_Port, &GPIO_InitStruct);
GPIO_InitStruct.Pin = KEY1_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLUP;
HAL_GPIO_Init(KEY1_GPIO_Port, &GPIO_InitStruct);
}
2.2 按键驱动框架层
按键驱动框架比较简单,将获取IO电平的HAL库函数二次封装一下即可:
uint8_t wkup_key_read_pin(void)
{
return HAL_GPIO_ReadPin(WKUP_GPIO_Port, WKUP_Pin);
}
uint8_t key0_read_pin(void)
{
return HAL_GPIO_ReadPin(KEY0_GPIO_Port, KEY0_Pin);
}
uint8_t key1_read_pin(void)
{
return HAL_GPIO_ReadPin(KEY1_GPIO_Port, KEY1_Pin);
}
2.3 按键管理层
2.3.1 按键对象状态
enum key_state {
Init_None_State = 0, /* 初始未按下状态 */
Init_Press_State, /* 初次按下状态 */
Press_Check_State, /* 连击检查状态 */
Continuous_Press_State, /* 连续按下状态 */
Long_Press_State, /* 长按状态 */
};
2.3.2 按键对象事件
enum key_event {
Press_Down = 0, /* 按键按下,每次按下都触发 */
Press_Up, /* 按键弹起,每次松开都触发 */
Singe_Click, /* 单击触发(仅触发一次) */
Double_Click, /* 双击触发(仅触发一次) */
Short_Press_Repeat, /* 每次短按时都会触发(按下次数>=2) */
Long_Press_Start, /* 首次进入长按状态触发(仅触发一次) */
Long_Press_Hold, /* 长按保持状态触发(每经过一个循环长按间隔触发一次) */
Event_Sum, /* 事件总数 */
None_Press /* 未按下 */
};
2.3.3 按键对象句柄结构体
struct key_handle
{
uint16_t tick; /* 按键系统时间片 */
uint8_t repeat_cnt : 4; /* 按键短按次数 */
uint8_t event : 4; /* 触发事件 */
uint8_t state : 3; /* 按键状态 */
uint8_t debounce_tick : 3; /* 消抖时间片 */
uint8_t active_level : 1; /* 按键有效按下电平 */
uint8_t key_level : 1; /* 按键引脚当前电平 */
uint8_t (* pin_read)(void); /* 获取按键引脚电平 */
void (* event_callback[Event_Sum])(struct key_handle* key); /* 按键事件回调函数 */
struct key_handle* next; /* 单向链表next指针 */
};
typedef struct key_handle *key_handle_t;
2.3.4 初始化按键对象
static key_handle_t _key_slist_head = NULL; // 按键管理单链表头结点
/**
* @brief 初始化按键对象
* @param key 按键对象句柄
* @param gpio_pin_read 获取按键电平函数指针
* @param active_level 按键按下有效电平
* @return 0: succeed -1: failed
*/
int8_t key_init(struct key_handle *key, uint8_t (*gpio_pin_read)(void), uint8_t active_level)
{
if (key == NULL)
return -1;
memset(key, 0, sizeof(struct key_handle));
key->event = None_Press;
key->active_level = active_level;
key->pin_read = gpio_pin_read;
key->key_level = key->pin_read();
return 0;
}
2.3.5 注册按键
/**
* @brief 注册按键:将按键对象插入到按键管理链表中
* @param key 按键对象句柄
* @return 0: succeed -1: failed
*/
int8_t key_handle_register(struct key_handle *key)
{
struct key_handle *key_slist_node = _key_slist_head; // 获取头指针的地址 (无头结点单链表)
if (key == NULL)
return -1;
// 尾插(不带头结点的单链表, 头指针需做特殊判断)
if (_key_slist_head == NULL) // 头指针为空==表空
{
_key_slist_head = key;
key->next = NULL;
return 0;
}
while(key_slist_node)
{
if (key_slist_node == key) return -1; // 重复注册
if(key_slist_node->next == NULL) break; // 已经遍历到最后一个节点,必须在此跳出循环, 否则key_slist_node==NULL
key_slist_node = key_slist_node->next;
}
key_slist_node->next = key;
key->next = NULL;
return 0;
}
2.3.6 脱离按键
/**
* @brief 脱离按键:将按键对象从按键管理链表中脱离
* @param key 按键对象句柄
* @return 0: succeed -1: failed
*/
int8_t key_handle_detach(struct key_handle *key)
{
// 解1级引用指向指针变量, 解2级引用指向指针变量所指向的变量
struct key_handle **key_slist_node = &_key_slist_head; // 指向头指针, 直接操作原指针变量(不然最后无法修改头指针)
struct key_handle *node_temp;
if (key == NULL || _key_slist_head == NULL)
return -1;
while(*key_slist_node && *key_slist_node != key)
{
node_temp = *key_slist_node;
if((*key_slist_node)->next == NULL) break;
key_slist_node = &node_temp->next; // 不能直接解1级引用赋值,会破坏原链表
}
if (*key_slist_node != key)
return -1;
*key_slist_node = (*key_slist_node)->next;
return 0;
}
2.3.7 注册事件回调函数
/**
* @brief 注册按键事件触发回调函数
* @param key 按键对象句柄
* @param event 触发事件类型
* @param event_callback 事件回调函数
* @return 0: succeed -1: failed
*/
int8_t key_event_callback_register(struct key_handle *key, uint8_t event, void (* event_callback)(key_handle_t key))
{
if (key == NULL || event >= Event_Sum)
return -1;
key->event_callback[event] = event_callback;
return 0;
}
2.3.8 按键状态机
状态符号 | 按键对象状态 | 含义 |
---|---|---|
state0 | Init_None_State | 初始未按下状态 |
state1 | Init_Press_State | 初次按下状态 |
state2 | Press_Check_State | 连击检查状态 |
state3 | Continuous_Press_State | 连续按下状态 |
state5 | Long_Press_State | 长按状态 |
/**
* @brief 处理所有按键对象的状态机
* @param key 按键对象句柄
* @return None
*/
static void key_handler(struct key_handle *key)
{
uint8_t key_level_temp = key->pin_read();
if(key->state != Init_None_State) key->tick++;
/* 按键消抖(按键状态发生变化保持DEBOUNCE_TICK时间片开始保存按键引脚电平) */
if(key_level_temp != key->key_level)
{
if(++(key->debounce_tick) >= Double_Click)
{
key->key_level = key_level_temp;
key->debounce_tick = 0;
}
}
else
{
key->debounce_tick = 0;
}
/* 按键状态机 */
switch (key->state)
{
case Init_None_State:
/* 初始态-> 初始按下态 Press_Down */
if(key->key_level == key->active_level)
{
key->event = (uint8_t)Press_Down;
__KEY_EVENT_CALL(Press_Down);
key->tick = 0;
key->repeat_cnt = 1;
key->state = Init_Press_State;
}
else
{
key->event = (uint8_t)None_Press;
}
break;
case Init_Press_State:
/* 第一次按下松开:初始按下态->连击检查态 Press_Up */
if(key->key_level != key->active_level)
{
key->event = (uint8_t)Press_Up;
__KEY_EVENT_CALL(Press_Up);
key->tick = 0;
key->state = Press_Check_State;
}
/* 第一次按下后长按(>LONG_PRESS_START_TICK):初始按下态->长按态 Long_Press_Start */
else if(key->tick > LONG_PRESS_START_TICK)
{
key->event = (uint8_t)Long_Press_Start;
__KEY_EVENT_CALL(Long_Press_Start);
key->state = Long_Press_State;
}
break;
case Press_Check_State:
/* 松开后再次按下:连击检查态->连击态 Press_Down & Short_Press_Repeat */
if(key->key_level == key->active_level)
{
key->event = (uint8_t)Press_Down;
__KEY_EVENT_CALL(Press_Down);
key->repeat_cnt++;
__KEY_EVENT_CALL(Short_Press_Repeat);
key->tick = 0;
key->state = Continuous_Press_State;
}
/* 松开后再次没有按下(>SHORT_PRESS_START_TICK):连击检查态->初始态 repeat_cnt=1: Singe_Click; repeat_cnt=2: Double_Click */
else if(key->tick > SHORT_PRESS_START_TICK)
{
if(key->repeat_cnt == 1)
{
key->event = (uint8_t)Singe_Click;
__KEY_EVENT_CALL(Singe_Click);
}
/* 连击态松开后会返回此条件下触发 todo: <可以做n连击判断> */
else if(key->repeat_cnt == 2)
{
key->event = (uint8_t)Double_Click;
__KEY_EVENT_CALL(Double_Click);
}
key->state = Init_None_State;
}
break;
case Continuous_Press_State:
/* 连击后松开:连击态->连击检查态(< SHORT_PRESS_START_TICK)) : 连击态->初始态(>= SHORT_PRESS_START_TICK) */
if(key->key_level != key->active_level)
{
key->event = (uint8_t)Press_Up;
__KEY_EVENT_CALL(Press_Up);
if(key->tick < SHORT_PRESS_START_TICK)
{
key->tick = 0;
key->state = Press_Check_State;
}
else
{
key->state = Init_None_State;
}
}
/* 连击后长按(>SHORT_TICKS): 连击态 -> 初始态 */
else if(key->tick > SHORT_PRESS_START_TICK)
{
key->state = Init_Press_State; // 可以回到Init_None_State/Init_Press_State
}
break;
case Long_Press_State:
/* 长按保持 Long_Press_Hold */
if(key->key_level == key->active_level)
{
key->event = (uint8_t)Long_Press_Hold;
if (key->tick % LONG_HOLD_CYCLE_TICK == 0)
{
__KEY_EVENT_CALL(Long_Press_Hold);
}
}
/* 长按松开:长按态-> 初始态 */
else
{
key->event = (uint8_t)Press_Up;
__KEY_EVENT_CALL(Press_Up);
key->state = Init_None_State;
}
break;
}
}
2.3.9 遍历调用按键对象
/**
* @brief 每经过一个滴答周期调用一次按键处理函数(裸机放1ms中断, OS放线程或中断)
* @param None
* @return None
*/
void key_tick(void)
{
struct key_handle *key_slist_node;
static uint8_t tick_cnt = 0;
if (++tick_cnt < CHECK_TICK)
return;
for (key_slist_node = _key_slist_head; key_slist_node != NULL; key_slist_node = key_slist_node->next)
{
key_handler(key_slist_node);
}
tick_cnt = 0;
}
注意:裸机环境下,函数必须在中断中(默认1ms,可修改)调用,上RTOS可以在线程上下文中检测。
3 应用示例
static struct key_handle _key0;
static void key0_event_callback(key_handle_t key)
{
switch(key->event)
{
case Press_Down:
UART_DEBUG("key0 press down");
break;
case Press_Up:
UART_DEBUG("key0 press up");
break;
case Singe_Click:
UART_DEBUG("key0 single click");
break;
case Double_Click:
UART_DEBUG("key0 double click");
break;
case Short_Press_Repeat:
UART_DEBUG("key0 short press repeat");
break;
case Long_Press_Start:
UART_DEBUG("key0 long press start");
break;
case Long_Press_Hold:
key_handle_detach(&_key0);
UART_DEBUG("key0 long press hold");
break;
default:
break;
}
}
void key_test_sample(void)
{
key_init(&_key0, key0_read_pin, GPIO_PIN_RESET);
key_event_callback_register(&_key0, Press_Down, key0_event_callback);
key_event_callback_register(&_key0, Press_Up, key0_event_callback);
key_event_callback_register(&_key0, Singe_Click, key0_event_callback);
key_event_callback_register(&_key0, Double_Click, key0_event_callback);
key_event_callback_register(&_key0, Short_Press_Repeat, key0_event_callback);
key_event_callback_register(&_key0, Long_Press_Start, key0_event_callback);
key_event_callback_register(&_key0, Long_Press_Hold, key0_event_callback);
key_handle_register(&_key0);
}
在定时器中断回调函数里检测:
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if (htim->Instance == TIM6)
{
key_tick();
}
}
串口打印信息:
代码已开源到gitee:以面向对象思想编写的按键管理框架
END
版权声明:本文为CSDN博主「柯西的彷徨」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/kouxi1/article/details/123008273
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