Question

求51单片机的P2口按键8个，P0口led8个，对应控制它的开或关，谢谢。要C语言。

Answer 1

sbit P2^0 =key0;
sbit P2^1 =key1;
sbit P2^2 =key2;
sbit P2^3 =key3;
sbit P2^4 =key4;
sbit P2^5 =key5;
sbit P2^6 =key6;
sbit P2^7 =key7;

sbit P0^0 =led0;
sbit P0^1 =led1;
sbit P0^2 =led2;
sbit P0^3 =led3;
sbit P0^4 =led4;
sbit P0^5 =led5;
sbit P0^6 =led6;
sbit P0^7 =led7;

假设按键按下为低电平，点亮LED用高电平，则示意代码如下
if（key0 == 0)
led0 = 1;

if（key1 == 0)
led1 = 1;

if（key2 == 0)
led2 = 1;

if（key3 == 0)
led3 = 1;
...........
............
if（key7 == 0)
led7 = 1;

Answer 2

jh

Answer 3

因为是一一对应的，可以简化一些操作，比如：假设LED低电平点亮，按键低电平有效
unsigned char data confirmKeyPressed(unsigned char data ledSwitch) {
if( ！( P2 & ~(1<<leSwitch) ) ) { //这里只实现了判断单个按键
DelayMs(15); //软件去抖
if( ！( P2 & ~(1<<leSwitch) ) )
return ( ~(1<<ledSwitch) ); //Led低电平点亮
}
else
return 0xff;
}

void LedSwitchOn(unsigned char data ledSwitch) {
P0 &= confirmKeyPressed(ledSwitch);
}

在主函数里面调用这个LedSwitch函数就好了