不就是通过循环让端口输出低电平,再通过查表看是哪个按下,再查找显示代码显示出来.
我把代码整理了一下:
#include<reg52.h>
#include<intrins.h>
#define display P1
#define keyboardCode P2
#define uint unsigned int
#define uchar unsigned char
uchar code initialKeyboardCode[] = { 0xef, 0xdf, 0xbf, 0x7f }; // Set the initial keyboard code.
uchar code getKeyboardCode[] = {
0xee, 0xed, 0xeb, 0xe7, 0xde, 0xdd, 0xdb, 0xd7, // When the keyboard pressed
0xbe, 0xbd, 0xbb, 0xb7, 0x7e, 0x7d, 0x7b, 0x77 }; // down ,the mcu will get one of them.
uchar code theActionCode[] = {
0xf7, 0xf4, 0xf1, 0xf0, 0xf8, 0xf5, 0xf2, 0xf0, // The display code, you can rewrite
0xf9, 0xf6, 0xf3, 0xf0, 0xf8, 0xf5, 0xf2, 0xf0
}; // them if you want . But the code you rewrite must correspondence
// with the ”getkeyboardCode”.
void KeyboardScan(void)
{
uchar sender = 0x00;
uchar counterOne = 0x00;
uchar counterTwo = 0x00;
for(counterOne=0x00; counterOne<4; counterOne++) // 轮流输出低电平
{
keyboardCode = initialKeyboardCode[counterOne]; // Load the initialKeyboardCode
sender = keyboardCode; // Get the keyboardCode when the keyboard press down
// perhaps a delay here.
for(counterTwo=0x00; counterTwo<16; counterTwo++)
{
// When a geyKeyboardC ode equal to the sender ,
if(sender==getKeyboardCode[counterTwo]) // 查表按键
{
// Then load the display code from the theActioncode
display = theActionCode[counterTwo]; // 查表显示代码
// You can write you control functions here too.
}
}
}
}
// The test main function.
void main(void)
{
display = 0x00;
while(1)
{
KeyboardScan();
}
}
// You can refer to the circuit below.
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