4x4矩阵键盘扫描-华芯微特

电路图:

4x4矩阵键盘扫描-华芯微特

扫描原理:

逐列扫描,先将第一列输出低,其他所有IO设置为上拉输入,读取IO值,高4位哪个为低,说明是当前列哪个按键按下。

源码:

4x4矩阵键盘扫描-华芯微特
 1 /*****************************************************************************
 2  * FILE NAME   keypad.h 
 3  * DESCRIPTION:    
 4  * Copyright   : xxx Technologies Ltd.
 5  * All Rights  Reserved
 6  * Author: Milo lu
 7  * Copyright (c) 2021, PGST Technologies Ltd.
 8  *
 9  * All rights reserved.
10 -* ****************************************************************************/
11 #ifndef     __KEYPAD_H
12 #define     __KEYPAD_H
13 
14 //--------------------- Keys Macro Define -----------------------
15 #define     KEY_0            BIT0
16 #define     KEY_1            BIT1
17 #define     KEY_2            BIT2
18 #define     KEY_3            BIT3
19 #define     KEY_4            BIT4
20 #define     KEY_5            BIT5
21 #define     KEY_6            BIT6
22 #define     KEY_7            BIT7
23 #define     KEY_8            BIT8
24 #define     KEY_9            BIT9
25 #define     ASTERIK_KEY     BIT10
26 #define     POUND_KEY       BIT11
27 #define     ARM_KEY         BIT12
28 #define     DISARM_KEY      BIT13
29 #define     HOME_KEY        BIT14
30 #define     SOS_KEY         BIT15
31 
32 
33 void keypad_init(void);
34 u16 keypad_scan(void);
35 
36 #endif
37 
38 //------------------------------ end of file ------------------------------
keypad.h 4x4矩阵键盘扫描-华芯微特
  1 /*****************************************************************************
  2  * FILE NAME   keypad.c 
  3  * DESCRIPTION:    
  4  * Copyright   : xxxTechnologies Ltd.
  5  * All Rights  Reserved
  6  * Author: Milo lu
  7  * Copyright (c) 2021, PGST Technologies Ltd.
  8  *
  9  * All rights reserved.
 10 -* ****************************************************************************/
 11 //---------------- system --------------------------
 12 #include "Global.h"
 13 
 14 //---------------- Peripheral ----------------------
 15 #include "keypad.h"
 16 
 17 
 18 
 19 u16 g_key_value;
 20 
 21 /**
 22  * @brief  keypad_init
 23  */
 24 void keypad_init(void)
 25 {
 26     int i;
 27     for(i=0;i<8;i++)        //PB1-PB8 set input with pull-up
 28     {
 29         GPIO_Init(GPIOB,i+1,0,1,0,0);
 30     }
 31 }
 32 
 33 /**
 34  * @brief  keypad_scan
 35  * @return key value
 36  */
 37 u16 keypad_scan(void)
 38 {
 39     u8 io_state;
 40     
 41     u16 key_value = 0;
 42     
 43     //---------------------- Read [1,4,7,*] keys ---------------------------
 44     GPIO_Init(GPIOB,PIN1,1,0,0,0);                      //the first column 
 45     vTaskDelay(2);
 46     io_state = (GPIOB->IDR>>1)&0xF0;                    //get io state
 47     if(io_state!=0xF0)                                  //is any key press in the frist column?
 48     {
 49         vTaskDelay(20);                                 //debouncing
 50         io_state = (GPIOB->IDR>>1)&0xF0;                //get io state again
 51         if(io_state!=0xF0)                              //is any key press? [1,4,7,*]
 52         {
 53             if((io_state&BIT7)==0)
 54             {
 55                 key_value |= KEY_1;
 56             }
 57             if((io_state&BIT6)==0)
 58             {
 59                 key_value |= KEY_4;
 60             }
 61             if((io_state&BIT5)==0)
 62             {
 63                 key_value |= KEY_7;
 64             }
 65             if((io_state&BIT4)==0)
 66             {
 67                 key_value |= ASTERIK_KEY;
 68             }
 69         }
 70     }
 71     GPIO_Init(GPIOB,PIN1,0,1,0,0);                      //release,input with pull-up
 72     
 73     //---------------------- Read [2,5,8,0] keys ---------------------------
 74     GPIO_Init(GPIOB,PIN2,1,0,0,0);                      //the second column
 75     vTaskDelay(2);
 76     io_state = (GPIOB->IDR>>1)&0xF0;                    //get io state
 77     if(io_state!=0xF0)                                  //is any key press in the second column?
 78     {
 79         vTaskDelay(20);                                 //debouncing
 80         io_state = (GPIOB->IDR>>1)&0xF0;                //get io state again
 81         if(io_state!=0xF0)                              //is any key press? [2,5,8,0]
 82         {
 83             if((io_state&BIT7)==0)
 84             {
 85                 key_value |= KEY_2;
 86             }
 87             if((io_state&BIT6)==0)
 88             {
 89                 key_value |= KEY_5;
 90             }
 91             if((io_state&BIT5)==0)
 92             {
 93                 key_value |= KEY_8;
 94             }
 95             if((io_state&BIT4)==0)
 96             {
 97                 key_value |= KEY_0;
 98             }
 99         }
100     }
101     GPIO_Init(GPIOB,PIN2,0,1,0,0);                      //release,input with pull-up
102     
103     //---------------------- Read [3,6,9,#] keys ---------------------------
104     GPIO_Init(GPIOB,PIN3,1,0,0,0);                      //the third column
105     vTaskDelay(2);
106     io_state = (GPIOB->IDR>>1)&0xF0;                    //get io state
107     if(io_state!=0xF0)                                  //is any key press in the second column?
108     {
109         vTaskDelay(20);                                 //debouncing
110         io_state = (GPIOB->IDR>>1)&0xF0;                //get io state again
111         if(io_state!=0xF0)                              //is any key press? [3,6,9,#]
112         {
113             if((io_state&BIT7)==0)
114             {
115                 key_value |= KEY_3;
116             }
117             if((io_state&BIT6)==0)
118             {
119                 key_value |= KEY_6;
120             }
121             if((io_state&BIT5)==0)
122             {
123                 key_value |= KEY_9;
124             }
125             if((io_state&BIT4)==0)
126             {
127                 key_value |= POUND_KEY;
128             }
129         }
130     }
131     GPIO_Init(GPIOB,PIN3,0,1,0,0);                      //release,input with pull-up
132     
133     //---------------------- Read [arm,diarm,home,sos] keys ---------------------------
134     GPIO_Init(GPIOB,PIN4,1,0,0,0);                      //the fourth column
135     vTaskDelay(2);
136     io_state = (GPIOB->IDR>>1)&0xF0;                    //get io state
137     if(io_state!=0xF0)                                  //is any key press in the second column?
138     {
139         vTaskDelay(20);                                 //debouncing
140         io_state = (GPIOB->IDR>>1)&0xF0;                //get io state again
141         if(io_state!=0xF0)                              //is any key press? [arm,diarm,home,sos]
142         {
143             if((io_state&BIT7)==0)
144             {
145                 key_value |= ARM_KEY;
146             }
147             if((io_state&BIT6)==0)
148             {
149                 key_value |= DISARM_KEY;
150             }
151             if((io_state&BIT5)==0)
152             {
153                 key_value |= HOME_KEY;
154             }
155             if((io_state&BIT4)==0)
156             {
157                 key_value |= SOS_KEY;
158             }
159         }
160     }
161     GPIO_Init(GPIOB,PIN4,0,1,0,0);                      //release,input with pull-up
162     
163     return key_value;
164 }
165 
166 
167 
168 
169 
170 
171 
172 
173 
174 
175 
176 //--------------------- end of file ------------------------------
keypad.c

仅供参考,请勿用于商业。谢谢

 

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