FND 실습
응용실습예제
1.앞의예제를수정하여, 버튼을누르면두개의FND가동일한숫자를표시하도록하기.
#include <avr/io.h>
int main()
{
DDRC = 0x00;
DDRE = 0xFF;
PORTE = 0xFF;
volatile unsigned char i = 0;
volatile unsigned char a = 0;
volatile unsigned char k = 0;
for(;;)
{
asm("NOP");
i = 0;
a = ~PINC;
while(a>=1)
{
a/2;
i++;
}
i=i<<4|i;
PORTE = i;
}
return 1;
} | } |
2.0~99까지순차적으로숫자를1씩증가하면서FND에표시하기
#include <avr/io.h>
int main()
{
DDRE = 0xFF;
PORTE = 0xFF;
volatile unsigned int i = 0;
volatile unsigned int j = 0;
volatile unsigned int k = 0;
volatile unsigned int t = 0;
for(i=0;i<100;++i)
{
k=i%10;
t=(i/10<<4)|k;
PORTE=t;
for(j=0;j<60000;j++);
for(j=0;j<60000;j++);
}
return 1;
}
|
3.99~0까지순차적으로숫자를1씩감소하면서FND에표시하기
#include <avr/io.h>
int main()
{
DDRE = 0xFF;
PORTE = 0xFF;
volatile char i = 0;
volatile unsigned int j = 0;
volatile unsigned int k = 0;
volatile unsigned int t = 0;
for(i=99;i>=0;--i)
{
if(i==0)
{
PORTE=0x00;
break;
}
k=i%10;
t=(i/10<<4)|k;
PORTE=t;
for(j=0;j<60000;j++);
for(j=0;j<60000;j++);
}
return 1;
}
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