下面是我之前写的一个按键检测的框架，适合比较多的按键操作，从信号接收、滤波、最好处理按键任务，大体上没什么问题，不过没具体测试过到时可能会有bug。
1 /****************************************************************************** 2 * @file button.c 3 * @author wule 4 * @version 5 * @date 6 * @brief 7 ****************************************************************************** 8 * 9 *****************************************************************************/ 10 11 typedef unsigned char ButtonSizeType; 12 13 typedef enum{ 14 RESET = 0, 15 SET = !RESET, 16 }FLAG; 17 18 typedef struct button_bit{ 19 ButtonSizeType button1:1; 20 ButtonSizeType button2:1; 21 ButtonSizeType button3:1; 22 ButtonSizeType button4:1; 23 ButtonSizeType button5:1; 24 ButtonSizeType button6:1; 25 ButtonSizeType button7:1; 26 ButtonSizeType button8:1; 27 }ButtonBitType; 28 29 typedef union 30 { 31 ButtonBitType button_bit; 32 ButtonSizeType button; 33 }ButtonType; 34 35 ButtonType InputFlag; 36 37 //初始化按键标志状态 38 void Init_Button_Variable(void) 39 { 40 InputFlag.button = 0; 41 } 42 43 //判断函数，读取每个按键的状态 44 ButtonSizeType ReadButtonBit(void) 45 { 46 ButtonType button_bit; 47 48 button_bit.button = 0; 49 50 button_bit.button_bit.button1 = 1; 51 button_bit.button_bit.button3 = 1; 52 button_bit.button_bit.button5 = 1; 53 54 return button_bit.button; 55 } 56 //滤波，返回值代表当前按键的值 57 ButtonSizeType Button_Filter(void) 58 { 59 ButtonSizeType bf_buf; 60 static ButtonSizeType bf_pre_buf = 0,bf_backval = 0; 61 static unsigned char bf_filtercnt = 0; 62 63 bf_buf = ReadButtonBit(); 64 65 if(bf_buf != bf_backval && bf_buf == bf_pre_buf)//判断两次是否相同 66 { 67 bf_filtercnt ++; 68 if(bf_filtercnt > 50)//作一个简单的滤波 69 { 70 bf_backval = bf_pre_buf; 71 } 72 } 73 else 74 { 75 bf_pre_buf = bf_buf; 76 bf_filtercnt = 0; 77 } 78 79 return bf_backval; 80 } 81 //处在一个时间可控的位置，这里可以实现各种按键的操作 82 void ButtonTask(void) 83 { 84 ButtonType bt_state = Button_Filter();//得到按键状态 85 86 if(InputFlag.button_bit.button1 == 0 && bt_state.button_bit.button1 == 1) 87 { 88 //单次触发 89 } 90 else if(InputFlag.button_bit.button1 == 1 && bt_state.button_bit.button1 == 0) 91 { 92 //单次释放 93 } 94 95 96 if(bt_state.button_bit.button1 == 1) 97 { 98 //计时触发 99 }100 else101 {102 //结束判断按的时间103 }104 }