P1口的矩阵按键,每一个按键实现一个程序使用适用于project中REGX51.H代码书写
时间: 2024-03-26 19:40:19 浏览: 26
好的,针对P1口的矩阵按键,您可以使用REGX51.H库中的以下代码来实现:
```
#include <REGX51.H> // 包含头文件
unsigned char scan_key() // 扫描键盘函数
{
unsigned char row, col, key_code;
P1 = 0x0f; // 将行线置低,列线置高
col = P1 & 0x0f; // 读取列线的值
P1 = 0xf0; // 将列线置低,行线置高
row = P1 & 0xf0; // 读取行线的值
if (row == 0x10) key_code = col; // 判断按键位置
if (row == 0x20) key_code = col + 4;
if (row == 0x40) key_code = col + 8;
if (row == 0x80) key_code = col + 12;
return key_code; // 返回键值
}
void main()
{
unsigned char key_code;
while (1) // 循环扫描键盘
{
key_code = scan_key();
switch (key_code) // 根据键值执行相应操作
{
case 0x01: P0 = 0x01; break;
case 0x02: P0 = 0x02; break;
case 0x03: P0 = 0x03; break;
case 0x04: P0 = 0x04; break;
case 0x05: P0 = 0x05; break;
case 0x06: P0 = 0x06; break;
case 0x07: P0 = 0x07; break;
case 0x08: P0 = 0x08; break;
case 0x09: P0 = 0x09; break;
case 0x0A: P0 = 0x0A; break;
case 0x0B: P0 = 0x0B; break;
case 0x0C: P0 = 0x0C; break;
case 0x0D: P0 = 0x0D; break;
case 0x0E: P0 = 0x0E; break;
case 0x0F: P0 = 0x0F; break;
case 0x10: P0 = 0x10; break;
case 0x11: P0 = 0x11; break;
case 0x12: P0 = 0x12; break;
case 0x13: P0 = 0x13; break;
case 0x14: P0 = 0x14; break;
case 0x15: P0 = 0x15; break;
case 0x16: P0 = 0x16; break;
case 0x17: P0 = 0x17; break;
case 0x18: P0 = 0x18; break;
case 0x19: P0 = 0x19; break;
case 0x1A: P0 = 0x1A; break;
case 0x1B: P0 = 0x1B; break;
case 0x1C: P0 = 0x1C; break;
case 0x1D: P0 = 0x1D; break;
case 0x1E: P0 = 0x1E; break;
case 0x1F: P0 = 0x1F; break;
default: P0 = 0x00; break; // 没有按键按下时,清零输出
}
}
}
```
这段代码可以实现P1口的矩阵按键的扫描和按键值的读取,并且根据按键值输出相应的数码信号。您可以根据实际需要进行修改和优化。
相关推荐
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)