#define MaxRow 4
#define MaxCol 4
#define NoK 255
#define KeyOutPrt PORTB
#define KeyInPrt PINB
unsigned char GKey(void)
{
unsigned char Col, Row, tmp;
unsigned char temp1[MaxCol] = {0x7F, 0xBF, 0xDF, 0xEF};
unsigned char temp2[MaxRow] = {0xF7, 0xFB, 0xFD, 0xFE};
tmp = KeyInPrt & 0x0F;
if (tmp == 0x0F)
return(NoK);
delay_ms(18);
tmp = KeyInPrt & 0x0F;
if (tmp == 0x0F)
return(NoK);
for (Col = 0; Col < MaxCol; Col++)
{
KeyOutPrt = temp1[Col];
for (Row = 0; Row < MaxRow; Row++)
{
tmp = KeyInPrt | 0xF0;
if (tmp == temp2[Row])
{
PORTB=0x0F;
return(Row * MaxCol + Col);
}
}
}
}
interrupt [USART_RXC] void usart_rx_isr(void)0
}
unsigned char buffer;1
buffer=UDR;2
switch(buffer)3
}
case 0XF0; ( inter code);4
break;5
{
{
void main(void)6
}
....
UCSRA=0x00;7
UCSRB=0X90;8
UCSRC=0Xf6;7
....
{
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