void IO_KeyScan(void)
{
u8 j;
j = IO_KeyState1; //保存上一次状态
P7 = 0xf0; //X低，读Y
IO_KeyDelay();
IO_KeyState1 = P7 & 0xf0;
P7 = 0x0f; //Y低，读X
IO_KeyDelay();
IO_KeyState1 |= (P7 & 0x0f);
IO_KeyState1 ^= 0xff; //取反
if(j == IO_KeyState1) //连续两次读相等
{
j = IO_KeyState;
IO_KeyState = IO_KeyState1;
if(IO_KeyState != 0) //有键按下
{
F0 = 0;
if(j == 0) F0 = 1; //第一次按下
else if(j == IO_KeyState)
{
if(++IO_KeyHoldCnt >= 20) //1秒后重键
{
IO_KeyHoldCnt = 18;
28
F0 = 1;
}
}
if(F0)
{
j = T_KeyTable[IO_KeyState >> 4];
if((j != 0) && (T_KeyTable[IO_KeyState& 0x0f] != 0))
{
KeyCode = (u8)(((j - 1) * 4 )+ (T_KeyTable[IO_KeyState &
0x0f]) ); //计算键码，17~32 + 16
}
}
}
else IO_KeyHoldCnt = 0;
}
P7 = 0xff;
}
2、主函数
void main(void)
{
IO_init(); //IO口初始化
LCD_Init();//液晶屏初始化
delay1ms(10);
LCD_Clear(WHITE);//清屏白底
UartInit(); //串口初始化
UartSendStr("按键测试\r\n");
KeyCode = 0; //给用户使用的键码, 1~16有效
IO_KeyState = 0;
IO_KeyState1 = 0;
IO_KeyHoldCnt = 0;
Gui_StrCenter(0,16,RED,BLUE,"KEY 测试程序",16,1);//居中显示
Show_Str(20,56,BLUE,YELLOW,"KeyCode:",16,0);
//循环
while(1)
{
IO_KeyScan();
if(KeyCode>0)
{
UartSendStr("pressed");
LCD_ShowNum(100,56,KeyCode,2,16);
}
KeyCode=0;
delay1ms(100);
}
}
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