51单片机利用4×4矩阵设计简易计算器
时间: 2023-12-10 09:02:48 浏览: 352
设计一个基于51单片机的简易计算器,需要使用4×4矩阵键盘进行输入和操作。以下是实现步骤:
1. 首先需要定义键盘矩阵的引脚连接,以及LCD显示屏的引脚连接。
2. 在程序中,需要定义每个按键的扫描码和对应的操作,例如数字按键对应数字显示,加减乘除按键对应对应的运算符号。
3. 在程序中实现按键扫描功能,当检测到按键按下时,根据按键的扫描码进行相应的操作。
4. 实现计算功能,对输入的数字和运算符进行计算,并在LCD屏幕上显示结果。
5. 最后需要进行错误处理,例如除数为0等异常情况。
通过以上步骤,就可以实现基于51单片机的简易计算器。
相关问题
51单片机简易计算器4行4列矩阵键盘1个8位数码管代码
以下是51单片机简易计算器4行4列矩阵键盘1个8位数码管代码的示例:
```c
#include <reg51.h>
sbit LSA = P2^2;
sbit LSB = P2^3;
sbit LSC = P2^4;
unsigned char KeyValue = 0; // 按键值
unsigned char KeyReady = 0; // 按键准备就绪标志
unsigned char KeyPressed = 0; // 按键已经被按下标志
void delay(unsigned int t) // 延时函数
{
unsigned int i, j;
for (i = 0; i < t; i++) {
for (j = 0; j < 120; j++);
}
}
void KeyScan() // 按键扫描函数
{
unsigned char temp, i;
temp = P1;
temp |= 0xF0;
P1 = temp;
for (i = 0; i < 4; i++) {
switch (i) {
case 0:
LSA = 0; LSB = 0; LSC = 0; break;
case 1:
LSA = 1; LSB = 0; LSC = 0; break;
case 2:
LSA = 0; LSB = 1; LSC = 0; break;
case 3:
LSA = 1; LSB = 1; LSC = 0; break;
}
temp = P1 & 0xF0;
if (temp != 0xF0) { // 有按键按下
delay(5); // 延时消除抖动
temp = P1 & 0xF0;
if (temp != 0xF0) {
switch (temp) {
case 0xE0:
KeyValue = i * 4 + 1; break;
case 0xD0:
KeyValue = i * 4 + 2; break;
case 0xB0:
KeyValue = i * 4 + 3; break;
case 0x70:
KeyValue = i * 4 + 4; break;
}
KeyReady = 1; // 设置按键准备就绪标志
}
while ((P1 & 0xF0) != 0xF0); // 等待按键释放
}
}
}
void Display(unsigned char num) // 数码管显示函数
{
unsigned char code table[] = { // 数码管编码表
0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07,
0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71
};
P0 = table[num];
}
void main()
{
unsigned char a = 0, b = 0, op = 0, result = 0; // a, b为操作数,op为运算符,result为结果
while (1) {
KeyScan(); // 扫描按键
if (KeyReady && !KeyPressed) { // 如果按键准备就绪且没有按键被按下
KeyPressed = 1; // 设置按键已经被按下标志
switch (KeyValue) {
case 1:
a = a * 10 + 1; break;
case 2:
a = a * 10 + 2; break;
case 3:
a = a * 10 + 3; break;
case 4:
op = '+'; break;
case 5:
b = b * 10 + 4; break;
case 6:
b = b * 10 + 5; break;
case 7:
b = b * 10 + 6; break;
case 8:
op = '-'; break;
case 9:
b = b * 10 + 7; break;
case 10:
b = b * 10 + 8; break;
case 11:
b = b * 10 + 9; break;
case 12:
op = '*'; break;
case 13:
a = 0; b = 0; op = 0; result = 0; break; // 清零
case 14:
b = b * 10 + 0; break;
case 15:
if (op == '+') {
result = a + b;
} else if (op == '-') {
result = a - b;
} else if (op == '*') {
result = a * b;
}
a = result; b = 0; op = 0; result = 0; // 将结果存入a中,清零b、op、result
break;
case 16:
op = '/'; break;
}
} else if (!KeyReady && KeyPressed) { // 如果按键准备就绪标志被清零且按键已经被按下
KeyPressed = 0; // 清空按键已经被按下标志
}
Display(a); // 显示a
}
}
```
这个代码实现了简单的加减乘除计算,按下数字键输入数字,按下运算符键选择运算符,按下等于键显示结果,按下清零键清零。
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