3/23 學生使用USB設備實作七段顯示器控制程式

同學實作七段顯示器控制程式，撰寫0000-9999每次遞增1的控制程式。


//8051 7S的程式碼範例

//規劃I/O埠A,B,C,D控制的相關暫存器記憶體位址
xdata char PORTACFG _at_ 0x7F93;
xdata char PORTBCFG _at_ 0x7F94;
xdata char PORTCCFG _at_ 0x7F95;
xdata char OUTA _at_ 0x7F96;
xdata char OUTB _at_ 0x7F97;
xdata char OUTC _at_ 0x7F98;
xdata char PINSA _at_ 0x7F99;
xdata char PINSB _at_ 0x7F9A;
xdata char PINSC _at_ 0x7F9B;
xdata char OEA _at_ 0x7F9C;
xdata char OEB _at_ 0x7F9D;
xdata char OEC _at_ 0x7F9E;
xdata char OUTD _at_ 0x7841;
xdata char PINSD _at_ 0x7842;
xdata char OED _at_ 0x7843;

#define DISPLAYTIME 1 // approx. milliseconds
unsigned char Da[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
void delay (int time)
{
int i,k;
for (k=0; k for (i=0; i<300; i++);
}
// 共陽極7-SEG解碼電路


void main()
{
unsigned char a=0,b,c,d;
int num[4]={0,0,0,0},num2=0;
PORTBCFG = 0x00;
OEB = 0xFF;
OED = 0xFF;

while(1)
{

for(d=0;d<250;d++)
{

b=0x0e;
for(c= 0; c<4;c++)
{
OUTD=Da[num[c]];
OUTB=b;
b=(b<<1)|1;
delay(DISPLAYTIME);

}
}

num2++;
num[0]=num2/1000;
num[1]=num2/100%10;
num[2]=num2/10%10;
num[3]=num2%10;
}
}