18b20怎样在1602上显示正常小数后一位

ID:753342 · 发表于 2020-5-16 15:54

void DS18B20_ReSet(void)
{
uchar i;
DQ = 0;
i = 240;
while (--i);
DQ = 1;
i = 30;
while (--i);
while (~DQ);
i = 4;
while (--i);

void DS18B20_WriteByte(uchar dat)
{
uchar j;
uchar btmp;

for (j = 0; j < 8; j++)
{
      btmp = 0x01;
      btmp = btmp << j;
      btmp = btmp & dat;

      if (btmp > 0) // D′1
      {
         DQ = 0;
         Delay15us();
         DQ = 1;
         Delay15us();
         Delay15us();
         Delay15us();
         Delay15us();
      }
      else          //
      {
         DQ = 0;
         Delay15us();
         Delay15us();
         Delay15us();
         Delay15us();
         DQ = 1;
         Delay15us();
      }

}

int DS18B20_ReadTemp(void)
{
uchar j;
int b, temp = 0;
EA = 0;

DS18B20_ReSet();
DS18B20_WriteByte(0xcc);
DS18B20_WriteByte(0x44);

DS18B20_ReSet();
DS18B20_WriteByte(0xcc);
DS18B20_WriteByte(0xbe);

for (j = 0; j < 16; j++)
{
      DQ = 0;
      _nop_();
      _nop_();
      DQ = 1;
      Delay15us();
      b = DQ;
      Delay15us();
      Delay15us();
      Delay15us();
      b = b << j;
      temp = temp | b;
}

EA = 1;
temp = temp * 0.0625+0.5;

return (temp);
}

void WaitForEnable(void)
{
P0 = 0xff;
LcdRs_P = 0;
LcdRw_P = 1;
_nop_();
LcdEn_P = 1;
_nop_();
_nop_();
while (P0 & 0x80);
LcdEn_P = 0;

}

ID:753342 · 发表于 2020-5-16 16:01

void LcdWriteCmd(uchar cmd)
{
WaitForEnable();
LcdRs_P = 0;
LcdRw_P = 0;
LcdEn_P = 0;
P0 = cmd;
DelayMs(5);
LcdEn_P = 1;
DelayMs(5);
LcdEn_P = 0;
DelayMs(5);
}

void LcdWriteData(uchar dat)
{
WaitForEnable();
LcdRs_P = 1;
LcdRw_P = 0;
LcdEn_P = 0;
P0 = dat;
DelayMs(5);
LcdEn_P = 1;
DelayMs(5);
LcdEn_P = 0;
DelayMs(5);
}
void LcdInit()
{
LcdWriteCmd(0x38);
LcdWriteCmd(0x0C);
LcdWriteCmd(0x06);
LcdWriteCmd(0x01);
LcdWriteCmd(0x80);
}

void LcdGotoXY(uchar line, uchar column)
{
if (line == 0)
      LcdWriteCmd(0x80 + (column & 0x0F));
if (line == 1)
      LcdWriteCmd(0x80 + 0x40 + (column & 0x0F));
}
void LcdPrintStr(uchar *str)
{
while (*str != '\0')
      LcdWriteData(*str++);
}
void LcdPrintNum1(uchar num)
{
LcdWriteData(0x30 + num%1000/100);
LcdWriteData(0x30 + num%100/10);
LcdWriteData(0x30 + num%10/1);
LcdWriteData('.');
LcdWriteData(0x30 + num/1);
}
void LcdPrintNum2(uint num）
if (num < 0)
{
      LcdWriteData('-');
      num = 0 - num;
}

else
{

LcdWriteData(0x30 + num%1000/100);
}
LcdWriteData(0x30 + num%100/10); // ê®Î»
LcdWriteData(0x30 + num%10/1);
LcdWriteData('.');
LcdWriteData(0x30 + num/1);

}

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