?? 7219.c
字號:
#include<reg52.h>
sbit din = P1^0;
sbit load = P1^1;
sbit clk = P1^2;
typedef unsigned int uint;
void write(uint dat) //先寫高位,高四位沒用,;;;;
{
int i;
load = 0;
clk = 0;
for(i = 0; i < 4; i ++)
{
din = 1;
clk = 1;
clk = 0;
}
for(i = 0x0800; i > 0; i >>= 1)
{
if(dat & i)
din = 1;
else
din = 0;
clk = 1;
clk = 0;
}
load = 1;
}
void main()
{
write( 0x0C01 ); /* 置LED為正常狀態(tài) */
write( 0x0B02 ); //置LED掃描范圍DIGIT0-2w
write( 0x0A08 ); /* 置LED亮度*/
write( 0x09ff ); //全譯碼;
write( 0x0102); //第一位是2;;;
write( 0x0203);
write( 0x0304);
while(1);
}
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