GPIO_KEY.rar_GPIO_KEY_gpiokey_key-gpio_led key GPIO_按键控制灯

/*============================================================ LPC23XX 学习板 GPIO-KEY功能演示 功能： 按下KEY对应的LED灭 KEY1---L1 KEY2---L2 KEY3---L3 KEY4---L4 作者: Mingtree ycxms88@163.com http://www.mcu123.com ============================================================== */ #include <LPC23xx.H> // #define KEY1 24 #define KEY2 25 #define KEY3 26 #define KEY4 27 //#define KEY_MASK=(1<<KEY1)|(1<<KEY2)|(1<<KEY3)|(1<<KEY4) unsigned char Scan_Key(void) { unsigned int k; unsigned char key,i; i=0; key=0; k=IOPIN1; if((k&1<<KEY4)==0)key+=1; key=key<<1; if((k&1<<KEY3)==0)key+=1; key=key<<1; if((k&1<<KEY2)==0)key+=1; key=key<<1; if((k&1<<KEY1)==0)key+=1; switch(key) { case 0x00: i=0; break; case 0x08: i=4; break; case 0x04: i=3; break; case 0x02: i=2; break; case 0x01: i=1; break; case 0x0F: //复合键 i=0XF; break; case 0x0E: i=0X0E; break; default: i=0; break; } return i; } void delay (unsigned int dly) { unsigned int i; for ( ; dly>0; dly--) for (i=0; i<50000; i++); } int main (void) { //unsigned int n; unsigned char i; PINSEL10 = 0; //禁止ETM PINSEL3=0; IODIR1=0x00000000; //P1.24~P1.27作输入 FIO2DIR=0x000000ff; //P2.0~P2.7作输出 FIO2MASK = 0x00000000; while (1) { i=Scan_Key(); //扫描按键 if(i!=0)FIO2SET = (1<<i-1); //对应的LED灭 delay(30); FIO2CLR = 0x000000FF; /* Turn on LEDs */ } }