参考代码
This commit is contained in:
LokLiang
395
app/button/button_event.c
Normal file
395
app/button/button_event.c
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include "driver/gpio.h"
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#include "os/os.h"
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#include "button_event.h"
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#define CONFIG_SYS_LOG_LEVEL SYS_LOG_LEVEL_WRN
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#define SYS_LOG_DOMAIN "BUTTON"
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#include "sys_log.h"
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#define VOLTAGE_HIGH 1 // 高电平有效
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#define VOLTAGE_LOW 0 // 高电平有效
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#define DEBOUNCE_CHECK_VOLTAGE_CHANGED 1
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#define DEBOUNCE_CHECK_VOLTAGE_DID_NOT_CHANGED 0
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#define DEBOUCE_CHECK_MAX_TIMES 5
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typedef struct
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{
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uint8_t pin;
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uint8_t is_inverted; // 是否反向，如果为真的话，则当按钮按下后，引脚为低电平
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uint16_t history;
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uint32_t down_time;
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uint32_t next_long_time;
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int current_voltage; // 当前引脚电平
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int debounce_check_counter;
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uint8_t allow_multiple_long_press_event;
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uint8_t long_press_event_sent;
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} debounce_t;
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int pin_count = -1;
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debounce_t *debounce;
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static os_queue_t s_event_queue; // 当出现按键变化时被传送到的队列对象
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static button_callback_t *g_callback_list_head = NULL;
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static button_callback_t *g_callback_list_tail = NULL;
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static os_work_t s_work_hdl;
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static os_queue_t *_pulled_button_init(unsigned long long pin_select, gpio_pull_mode_t pull_mode);
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static uint32_t millis()
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{
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return os_get_sys_time();
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}
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static int send_event(debounce_t *db, button_event_e ev)
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{
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static char *const ev_tbl[] = {
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[BUTTON_UP] = "release",
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[BUTTON_DOWN] = "press",
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[BUTTON_HELD] = "held"};
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SYS_ASSERT(ev < sizeof(ev_tbl), "ev: %d", ev);
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SYS_LOG_DBG("event happend: pinnum: %d, ev: %s", db->pin, ev_tbl[ev]);
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button_event_t event = {
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.pin = db->pin,
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.event = ev,
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};
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os_queue_send(&s_event_queue, &event, 0);
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button_callback_t *tmp = g_callback_list_head;
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button_callback_t *callback_list = NULL;
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button_callback_t *callback_list_it = NULL;
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while (tmp != NULL)
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{
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if (tmp->pin == db->pin)
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{
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button_callback_t *new_callback = NULL;
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if (callback_list == NULL)
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{
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callback_list = os_malloc(sizeof(button_callback_t));
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callback_list_it = callback_list;
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new_callback = callback_list_it;
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}
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else
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{
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new_callback = os_malloc(sizeof(button_callback_t));
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}
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new_callback->pin = db->pin;
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new_callback->event_callback = tmp->event_callback;
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new_callback->next = NULL;
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if (new_callback != callback_list_it)
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{
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callback_list_it->next = new_callback;
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callback_list_it = new_callback;
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}
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}
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tmp = tmp->next;
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}
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tmp = callback_list;
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int stop_forward_event = 0;
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while (tmp != NULL)
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{
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if (tmp->pin == db->pin)
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{
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SYS_LOG_DBG("do call back: pinnum: %d, ev: %s", db->pin, ev_tbl[ev]);
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stop_forward_event = tmp->event_callback(&event);
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if (stop_forward_event)
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{
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break;
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}
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}
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tmp = tmp->next;
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}
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// 释放临时遍历对象
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tmp = callback_list;
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while (tmp)
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{
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button_callback_t *next_obj = tmp->next;
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os_free(tmp);
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tmp = next_obj;
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}
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return stop_forward_event;
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}
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static int update_debounce_counter(int pin_index)
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{
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debounce_t *button_event_info = &debounce[pin_index];
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int level = gpio_get_level(button_event_info->pin);
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if (button_event_info->current_voltage != level)
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{
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button_event_info->debounce_check_counter += 1;
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}
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else if (button_event_info->current_voltage == level && button_event_info->debounce_check_counter > 0)
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{
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button_event_info->debounce_check_counter -= 1;
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}
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// 防抖检测已经连续多次检测到相同的电平，则改变按钮当前的电平
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if (button_event_info->debounce_check_counter == DEBOUCE_CHECK_MAX_TIMES)
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{
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button_event_info->current_voltage = level;
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button_event_info->debounce_check_counter = 0;
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SYS_LOG_DBG("button voltage changed, pin:%d, voltage:%d", button_event_info->pin, level);
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return DEBOUNCE_CHECK_VOLTAGE_CHANGED;
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}
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return DEBOUNCE_CHECK_VOLTAGE_DID_NOT_CHANGED;
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}
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static bool is_button_down(int pin_index)
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{
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debounce_t *button_event_info = &debounce[pin_index];
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if (button_event_info->is_inverted && button_event_info->current_voltage == VOLTAGE_LOW)
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{
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// 如果电平是反向的，并且当前是低电平，则认为按钮按下了
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return true;
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}
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else if (!button_event_info->is_inverted && button_event_info->current_voltage == VOLTAGE_HIGH)
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{
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// 如果电平不是反向的，并且当前是高电平，则认为按钮按下了
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return true;
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}
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return false;
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}
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static bool is_button_up(int pin_index)
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{
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debounce_t *button_event_info = &debounce[pin_index];
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if (button_event_info->is_inverted && button_event_info->current_voltage == VOLTAGE_HIGH)
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{
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// 如果电平是反向的，并且当前是高电平，则认为按钮释放了
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return true;
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}
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else if (!button_event_info->is_inverted && button_event_info->current_voltage == VOLTAGE_LOW)
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{
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// 如果电平不是反向的，并且当前是低电平，则认为按钮释放了
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return true;
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}
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return false;
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}
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static void _work_handler_button(void *pvParameter)
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{
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static uint8_t cancel_laster_event = 1;
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for (int idx = 0; idx < pin_count; idx++)
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{
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debounce_t *button_event_info = &debounce[idx];
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int check_result = update_debounce_counter(idx); // 防抖处理
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if (check_result == DEBOUNCE_CHECK_VOLTAGE_DID_NOT_CHANGED)
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{
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// 如果allow_multiple_long_press_event为false，则一次长按无论长按多久，只会触发一次长按事件
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if (!button_event_info->allow_multiple_long_press_event && button_event_info->long_press_event_sent != 0)
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{
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continue;
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}
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// 电平没有变化，则检查按钮是否已经按下，以开始检查长按操作
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if (button_event_info->down_time && millis() >= button_event_info->next_long_time)
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{
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button_event_info->next_long_time = millis() + LONG_PRESS_REPEAT;
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button_event_info->long_press_event_sent = 1;
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cancel_laster_event = send_event(&debounce[idx], BUTTON_HELD);
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if (cancel_laster_event)
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{
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button_event_info->down_time = 0;
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}
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}
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}
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else
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{
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// 电平有变化，检查是按下还是松开
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if (button_event_info->down_time == 0 && is_button_down(idx))
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{
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cancel_laster_event = 0;
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SYS_LOG_DBG("update downtime for pin:%d", button_event_info->pin);
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button_event_info->down_time = millis();
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button_event_info->next_long_time = button_event_info->down_time + LONG_PRESS_DURATION;
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cancel_laster_event = send_event(&debounce[idx], BUTTON_DOWN);
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if (cancel_laster_event)
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{
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button_event_info->down_time = 0;
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}
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}
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else if (button_event_info->down_time && is_button_up(idx))
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{
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button_event_info->down_time = 0;
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button_event_info->long_press_event_sent = 0;
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cancel_laster_event = send_event(&debounce[idx], BUTTON_UP);
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if (cancel_laster_event)
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{
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button_event_info->down_time = 0;
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}
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}
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}
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}
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os_work_later(10);
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}
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/**
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* @brief 初始化按电平式的按键检测。
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* 这将创建一个用于扫描按键的线程，当检测到按键变化时，将在线程中产生两种通知：
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* 1. 发送到内部创建的队列中（提示：如果使用了 os_queue_regist() 注册工作项，该工作项将被自动唤醒）
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* 2. 执行由 button_event_add_callback() 设置的回调函数（提示：同一引脚可设置多个回调）
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*
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* @param pin_select 按位表示 MCU 的引脚呈
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* @param en_lev 触发电平
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* @return os_queue_t* 由内部创建的消息队列
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*/
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os_queue_t *button_init(unsigned long long pin_select, uint8_t en_lev)
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{
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return _pulled_button_init(pin_select, en_lev == 0 ? GPIO_PULLUP_ONLY : GPIO_PULLDOWN_ONLY);
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}
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static os_queue_t *_pulled_button_init(unsigned long long pin_select, gpio_pull_mode_t pull_mode)
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{
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if (pin_count != -1)
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{
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SYS_LOG_WRN("Already initialized");
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return NULL;
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}
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// Configure the pins
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gpio_config_t io_conf;
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io_conf.mode = GPIO_MODE_INPUT;
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io_conf.pull_up_en = (pull_mode == GPIO_PULLUP_ONLY || pull_mode == GPIO_PULLUP_PULLDOWN);
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io_conf.pull_down_en = (pull_mode == GPIO_PULLDOWN_ONLY || pull_mode == GPIO_PULLUP_PULLDOWN);
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io_conf.pin_bit_mask = pin_select;
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io_conf.intr_type = GPIO_INTR_DISABLE;
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gpio_config(&io_conf);
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// Scan the pin map to determine number of pins
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pin_count = 0;
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int pin = 0;
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for (pin = 0; pin < sizeof(pin_select) * 8; pin++)
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{
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if ((1ULL << pin) & pin_select)
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{
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pin_count++;
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}
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}
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// Initialize global state and s_event_queue
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debounce = os_calloc(sizeof(debounce_t) * pin_count);
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// s_event_queue = xQueueCreate(4, sizeof(button_event_t));
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os_queue_create(&s_event_queue, 4, sizeof(button_event_t));
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// Scan the pin map to determine each pin number, populate the state
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uint32_t idx = 0;
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for (pin = 0; pin < sizeof(pin_select) * 8; pin++)
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{
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if ((1ULL << pin) & pin_select)
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{
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SYS_LOG_DBG("Registering button input: %d", pin);
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debounce_t *button_event_info = &debounce[idx];
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button_event_info->pin = pin;
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button_event_info->down_time = 0;
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button_event_info->allow_multiple_long_press_event = 1;
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button_event_info->is_inverted = (pull_mode == GPIO_PULLUP_ONLY);
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idx++;
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}
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}
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os_work_create(&s_work_hdl, "", _work_handler_button, NULL, OS_PRIORITY_HIGHEST);
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os_work_submit(default_os_work_q_hdl, &s_work_hdl, 1000);
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SYS_LOG_INF("Initialized");
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return &s_event_queue;
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}
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/**
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* @brief 添加回调函数：当由 button_init() 设置的对应的引脚号产生按键状态变化时，由内部线程创建执行的回调函数。
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*
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* @param pin 0..n
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* @param callback int (*)(const button_event_t *event)
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*/
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void button_event_add_callback(uint32_t pin, BUTTON_EVENT_CALLBACK callback)
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{
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button_callback_t *callback_obj = os_malloc(sizeof(button_callback_t));
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callback_obj->pin = pin;
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callback_obj->event_callback = callback;
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callback_obj->next = NULL;
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if (g_callback_list_head == NULL)
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{
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g_callback_list_head = callback_obj;
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g_callback_list_tail = g_callback_list_head;
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}
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else
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{
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g_callback_list_tail->next = callback_obj;
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g_callback_list_tail = callback_obj;
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}
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}
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void button_event_remove_callback(uint32_t pin, BUTTON_EVENT_CALLBACK callback)
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{
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button_callback_t *tmp = g_callback_list_head;
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button_callback_t *previous_item = NULL;
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SYS_LOG_DBG("remove pin:%d", pin);
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while (tmp != NULL)
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{
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if (tmp->event_callback == callback && tmp->pin == pin)
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{
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if (previous_item)
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{
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previous_item->next = tmp->next; // 断开当前点节，并将前一个和后一个连接起来
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os_free(tmp);
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SYS_LOG_DBG("found item");
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tmp = previous_item->next;
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}
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else
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{
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// 没有上一个节点，则将头部节点，设置为待移除节点的下一个节点
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if (tmp->next)
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{
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g_callback_list_head = tmp->next;
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}
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else
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{
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g_callback_list_head = NULL;
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SYS_LOG_DBG("####!!!!#####!!!!");
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}
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os_free(tmp);
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tmp = g_callback_list_head;
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SYS_LOG_DBG("case111");
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}
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SYS_LOG_DBG("2222");
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}
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else
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{
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previous_item = tmp;
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tmp = tmp->next;
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SYS_LOG_DBG("1111");
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}
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}
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// 更新g_callback_list_tail指针
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while (tmp != NULL)
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{
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g_callback_list_tail = tmp;
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tmp = tmp->next;
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}
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SYS_LOG_DBG("doneeee1");
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}
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