求大神赐教这个显示程序是什么意思

ID:158420 · 发表于 2016-12-28 17:47

#include "reg52.h"

unsigned char code dsp_code_ca[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned int tflag;
unsigned char dspflag;
unsigned char second;
unsigned char dflag;

void display(unsigned char d);

void main()
{
  TMOD |= 0x02;
  TH0 = 0x06;
  TL0 = 0x06;
  EA = 1;
  ET0 = 1;
  TR0 = 1;
  while(1)
  {
display(second);
  }
}

//T0中断服务函数
void isr_t0(void) interrupt 1
{
  tflag++;
  dflag++;
  if(dflag == 16)
  {
    dflag = 0;
dspflag++;
if(dspflag == 2)
   dspflag = 0;
  }
  if(tflag == 4000)
  {
tflag = 0;
second++;
if(second == 60)
   second = 0;
  }
}

ID:158420 · 发表于 2016-12-28 17:54

//显示程序 void display(unsigned char d) { if((dspflag == 0) && (d/10 != 0)) { P0 = 0xFF; P2 |= 0xE0; P2 &= 0x1F; P0 = dsp_code_ca[d/10]; P2 |= 0xE0; P2 &= 0x1F; P0 = 0x40; P2 |= 0xC0; P2 &= 0x3F; } if(dspflag == 1) { P0 = 0xFF; P2 |= 0xE0; P2 &= 0x1F; P0 = dsp_code_ca[d%10]; P2 |= 0xE0; P2 &= 0x1F; P0 = 0x80; P2 |= 0xC0; P2 &= 0x3F; } }

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求大神赐教这个显示程序是什么意思

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