求找错：LPC2114的温度显示

只看该作者 · 2012-11-20 11:07

/*-----------------------------------------------
  名称：温度显示
  日期：2012.11
  P0.0-P0.7  LCD_1602 IO
  P0.8=LCD_RS,  P0.9=LCD_RW,
  P0.10=LCD_E,  P0.11=DQ
问题应该是在  uchar ReadOneChar(void)
刚接触ARM 求指点一下
------------------------------------------------*/
#include <LPC21xx.H>
#define uchar unsigned char
#define uint unsigned int
char table[]="l_Temp ";
char table1[]=" : ";
uchar num,temp,ftemp;
/*------------------------------------------------
                  延迟
------------------------------------------------*/
void DelayUs2x(unsigned char t)
{
while(--t);
}
void DelayMs(unsigned char t)
{

while(t--)
{
   //大致延时1mS
   DelayUs2x(245);
  DelayUs2x(245);
}
}
/*------------------------------------------------
                  初始化ds18b20
------------------------------------------------*/
void Init_DS18B20(void)
{
IO0SET=0x00000800;                         //DQ
DelayUs2x(5); //稍做延时
IO0CLR=0x00000800;
DelayUs2x(100); //精确延时大于 480us 小于960us
IO0SET=0x00000800;
DelayUs2x(50); //15~60us 后接收60-240us的存在脉冲
}
/*------------------------------------------------
                  读取一个字节
------------------------------------------------*/
uchar ReadOneChar(void)
{
unsigned char i=0;
unsigned char dat = 0;
IO0DIR=0x000007ff;    //设置DQ为输入模式
for (i=8;i>0;i--)
{
  dat>>=1;
  IO0DIR=0x00000fff;
  IO0SET=0x00000800;
  IO0CLR=0x00000800;
  IO0SET=0x00000800;
IO0DIR=0x000007ff;
  if(IO0PIN&0x00000800==0x00000800)          //读取引脚状态，DQ=1，插入1，DQ=0，直接移位
dat|=0x00000080;
  DelayUs2x(10);
}
return(dat);
}
/*------------------------------------------------
                  写入一个字节
------------------------------------------------*/
void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
IO0DIR=0x00000fff;    //设置DQ为输出模式
for (i=8; i>0; i--)
{
  IO0SET=0x00000800;
  IO0CLR=0x00000800;
  if(dat&0x00000001)
IO0SET=0x00000800;
  else IO0CLR=0x00000800;
  DelayUs2x(10);
  IO0SET=0x00000800;
  dat>>=1;
}
DelayUs2x(25);
}
/*------------------------------------------------
                  读取温度
------------------------------------------------*/
int ReadTemperature(void)
{
  unsigned char a=0;
  unsigned int b=0;
  Init_DS18B20();
  WriteOneChar(0xCC); // 跳过读序号列号的操作
  WriteOneChar(0x44); // 启动温度转换
  DelayMs(10);
  Init_DS18B20();
  WriteOneChar(0xCC); //跳过读序号列号的操作
  WriteOneChar(0xBE); //读取温度寄存器等（共可读9个寄存器）前两个就
  a=ReadOneChar(); //低位
  b=ReadOneChar(); //高位
  temp=b;
  temp<<=4;
  temp<<=4;
  temp=temp|a;
  ftemp=temp*0.0625;
  temp=ftemp*10+0.5;
  ftemp=ftemp+0.05;
  return temp;
}
/*------------------------------------------------
                  LCD1602初始化
------------------------------------------------*/
void write_com(uchar com)
{
  IO0CLR=0x00000700;
  IO0SET=com;
  IO0CLR=(~com&0x000000ff);

  DelayMs(5);
  IO0SET=0x00000400;
  DelayMs(5);
  IO0CLR=0x00000400;
}
void write_date(uchar date)
{
  IO0CLR=0x00000200;
  IO0SET=0x00000100;
  IO0SET=date;
  IO0CLR=(~date&0x000000ff);
  DelayMs(5);
  IO0SET=0x00000400;
  DelayMs(5);
  IO0CLR=0x00000400;
}
void Init_1602()
{
IO0CLR=0x00000600;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
write_com(0x80+3);
for(num=0;num<11;num++)
{
   write_date(table[num]);
   DelayMs(30);
}
write_com(0x80+0x40+4);
for(num=0;num<9;num++)
{
   write_date(table1[num]);
   DelayMs(30);
}
}
void write_1602(uint date)
{ uint qian,bai,shi;
qian=date/100;
      write_com(0xc6);
      write_date(0x30+qian);

bai=date%100/10;
      write_com(0xc8);
      write_date(0x30+bai);
shi=date%10;
  write_com(0xc9);
      write_date(0x30+shi);
  write_com(0xcb);
      write_date('C');
}
/*------------------------------------------------
                  主程序
------------------------------------------------*/
int main()
{
PINSEL0 = 0x00000000;  //低16位设置为I/O模式
IO0DIR = 0x00000fff; //0-11输出

Init_1602();
while(1)
{
   write_1602(ReadTemperature());
   DelayMs(20);
}
}