/*************** writer:shopping.w ******************/
#include
#define uint unsigned int
#define uchar unsigned char
sbit LED1 = P1^0;
sbit LED2 = P1^3;
sbit K1 = P1^7;
uchar Operation_NO = 0;
uchar code DSY_CODE[]=
{
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f
};

void Delay(uint x)
{
uchar i;
while(x--)
{
for(i=0;i<120;i++);
}
}

void putc_to_SerialPort(uchar c)
{
SBUF = c;
while(TI == 0);
TI = 0;
}

void main()
{
LED1=LED2=1;
P0 = 0x00;
SCON = 0x50;
TMOD = 0x20;
PCON = 0x00;
TH1 = 0xfd;
TL1 = 0xfd;
TI = 0;
RI = 0;
TR1 = 1;
IE = 0x90;
while(1)
{
Delay(100);
if(K1 == 0)
{
while(K1==0);
Operation_NO=(Operation_NO+1)%4;
switch(Operation_NO)
{
case 0:
putc_to_SerialPort(X);
LED1=LED2=1; break;
case 1:
putc_to_SerialPort(A);
LED1=0;LED2=1;break;
case 2:
putc_to_SerialPort(B);
LED2=0;LED1=1;break;
case 3:
putc_to_SerialPort(C);
LED1=0;LED2=0;break;
}
}
}
}

void Serial_INT() interrupt 4
{
if(RI)
{
RI = 0;
if(SBUF>=0&&SBUF<=9)
P0 = DSY_CODE[SBUF];
else
P0 = 0x00;
}
}