我在 mikroC 中编写了一个函数,可以扫描 4x4 键盘中的按键
void scan_key()
{
PORTB = 0B11111110;
if ( PORTB == 0b11101110){
Row = 1;
Column = 1;
return;
}
if ( PORTB == 0b11011110){
Row = 2;
Column = 1;
return;
}
if ( PORTB == 0b10111110){
Row = 3;
Column = 1;
return;
}
if ( PORTB == 0b01111110){
Row = 4;
Column = 1;
return;
}
PORTB = 0B11111101;
if ( PORTB == 0b11101101){
Row = 1;
Column = 2;
return;
}
if ( PORTB == 0b11011101){
Row = 2;
Column = 2;
return;
}
if ( PORTB == 0b10111101){
Row = 3;
Column = 2;
return;
}
if ( PORTB == 0b01111101){
Row = 4;
Column = 2;
return;
}
PORTB = 0B11111011;
if ( PORTB == 0b11101011){
Row = 1;
Column = 3;
return;
}
if ( PORTB == 0b11011011){
Row = 2;
Column = 3;
return;
}
if ( PORTB == 0b10111011){
Row = 3;
Column = 3;
return;
}
if ( PORTB == 0b01111011){
Row = 4;
Column = 3;
return;
}
PORTB = 0B11110111;
if ( PORTB == 0b11100111){
Row = 1;
Column = 4;
return;
}
if ( PORTB == 0b11010111){
Row = 2;
Column = 4;
return;
}
if ( PORTB == 0b10110111){
Row = 3;
Column = 4;
return;
}
if ( PORTB == 0b01110111){
Row = 4;
Column = 4;
return;
}
PORTB = 0B11110000;
}
有没有办法将此算法转换为循环?