单片机+光感GY30 BH1750FVI程序Bug问题求解

ID:418269 · 发表于 2019-6-25 10:52

使用lcd1602能读取出数据，且光照强度有变化，但是跳变的、并不能线性变化。比如远近光照强度是几百的变化。
各人认为是Main 主程序& Bh1750子程序的问题，请大神们能帮忙指正。
********************Main.c*****************************
#include <reg52.h>

extern void lcd1602init();
extern void lcd1602showStr(unsigned char x,unsigned char y,unsigned char *str);

extern unsigned int BH1750_Read(unsigned char addr);
extern void BH1750_Write(unsigned char addr,unsigned char cmd);
sbit       Bh1750_Addr=P2^4;

void Delay_1mS(unsigned char ms);

void main()
{
      Bh1750_Addr=0;
      unsigned int tmp;
      unsigned char val[8];
      lcd1602init();
      lcd1602showStr(0,0,"light:");
      while(1)
      {
            BH1750_Write((0x23<<1),0x01);//send slaveaddr,power on
            BH1750_Write((0x23<<1),0x10);// Continuously H-resolution mode
            Delay_1mS(200);

            tmp=BH1750_Read((0x23<<1)|0x01);

            val[0]=tmp/10000 +'0';
            val[1]=tmp/1000%10 +'0';
            val[2]=tmp/100%10 +'0';
            val[3]=tmp/10%10 +'0';
            val[4]=tmp%10 +'0';
            val[5]=' ';
            val[6]='l';
            val[7]='x';

            lcd1602showStr(7,0,val);
      }
}

void Delay_1mS(unsigned char ms)
{
      unsigned int i,j;
      for(i=0;i<ms;i++)
            {
                     for(j=0;j<121;j++)
                     {;}
            }
}

*****************************************************

**********************BH1750.c***********************
#include <reg52.h>

extern void i2c_Star();
extern bit i2c_Write(unsigned char dat);
extern unsigned char i2c_ReadAck();
extern unsigned char i2c_ReadNack();
extern void i2c_Stop();

void BH1750_Write(unsigned char addr,unsigned char cmd)
{
      i2c_Star();
      i2c_Write(addr);
      i2c_Write(cmd);
      i2c_Stop();
}

unsigned int BH1750_Read(unsigned char addr)
{
      unsigned int tmp;
      unsigned char MSB,LSB;
      i2c_Star();
      i2c_Write(addr);
      MSB=i2c_ReadAck();
      LSB=i2c_ReadNack();
      i2c_Stop();
      tmp=(int)MSB<<8+LSB;

      return tmp;
}

*****************************************************

********************i2c.c*****************************
#include <reg52.h>
#include <intrins.h>

#define i2cDelay() {_nop_();_nop_();_nop_();_nop_();}
sbit i2c_SDA=P2^0;
sbit i2c_SCL=P2^1;

void i2c_Star()
{
      i2c_SDA=1;
      i2c_SCL=1;
      i2cDelay();
      i2c_SDA=0;
      i2cDelay();
      i2c_SCL=0;
      i2cDelay();
}

void i2c_Stop()
{
      i2c_SDA=0;
      i2c_SCL=0;
      i2cDelay();
      i2c_SCL=1;
      i2cDelay();
      i2c_SDA=1;
      i2cDelay();
}

bit i2c_Write(unsigned char dat)
{
      bit ack;
      unsigned char mask;
      for(mask=0x80;mask!=0;mask>>=1)
      {
            if(0==(mask&dat))
                     i2c_SDA=0;
            else
                     i2c_SDA=1;
            i2cDelay();
            i2c_SCL=1;
            i2cDelay();
            i2c_SCL=0;
      }
            i2c_SDA=1;
            i2cDelay();
            i2c_SCL=1;
            i2cDelay();
            ack=i2c_SDA;
            i2c_SCL=0;

      return ack;
}

unsigned char i2c_ReadAck()
{
      unsigned char mask,dat=0;
      for(mask=0x80;mask!=0;mask>>=1)
      {
            if(0==i2c_SDA)
                     dat&=~mask;// 0b0000 0000 & 0b0111 1111
            else
                     dat|=mask;//  0b0000 0000 & 0b1000 0000
            i2cDelay();
            i2c_SCL=1;
            i2cDelay();
            i2c_SCL=0;
      }
      i2c_SDA=0; //send ACK
      i2cDelay();
      i2c_SCL=1;       //over
      i2cDelay();
      i2c_SCL=0;

      return dat;
}

unsigned char i2c_ReadNack()
{
      unsigned char mask,dat=0;
      for(mask=0x80;mask!=0;mask>>=1)
            {
            if(0==i2c_SDA)
                     dat&=~mask;// 0b0000 0000 & 0b0111 1111
            else
                     dat|=mask;//  0b0000 0000 & 0b1000 0000
            i2cDelay();
            i2c_SCL=1;
            i2cDelay();
            i2c_SCL=0;
      }
      i2c_SDA=1; //send NACK
      i2cDelay();
      i2c_SCL=1;       //over
      i2cDelay();
      i2c_SCL=0;

      return dat;
}

*****************************************************

********************lcd1602.c*************************

#include <reg52.h>

#define lcd1602_Databus P0
sbit lcd1602_RS=P1^0;
sbit lcd1602_RW=P1^1;
sbit lcd1602_E=P2^5;
sbit Digitaltube_Dula=P2^6;

void lcd1602_ReadState()
{
      unsigned char state;
      Digitaltube_Dula=0xff;
      lcd1602_RS=0;
  lcd1602_RW=1;
      do{
                     lcd1602_E=1;
               state=lcd1602_Databus;
                     lcd1602_E=0;
   }while(state&0x80);
}

void lcd1602WriteCommand(unsigned char cmd)
{
      lcd1602_ReadState();
  lcd1602_RS=0;
  lcd1602_RW=0;
  lcd1602_Databus=cmd;
  lcd1602_E=1;
  lcd1602_E=0;
}

void lcd1602WriteData(unsigned char dat)
{
  lcd1602_ReadState();
  lcd1602_RS=1;
  lcd1602_RW=0;
  lcd1602_Databus = dat;
  lcd1602_E=1;
  lcd1602_E=0;
}

void lcd1602init()
{
  lcd1602_Databus=0;
  Digitaltube_Dula=0;
  lcd1602WriteCommand(0x38);
  lcd1602WriteCommand(0x0C);
  lcd1602WriteCommand(0x06);
  lcd1602WriteCommand(0x01);
}

void lcd1602setCursor(unsigned char x,unsigned char y)
{
      unsigned char addr;
  if(0==y)
            addr=0x00+x;
      else
            addr=0x40+x;
      lcd1602WriteCommand(addr|0x80);
}

void lcd1602showStr(unsigned char x,unsigned char y,unsigned char *str)
{
      lcd1602setCursor(x,y);
      while(*str!='\0')
      {
            lcd1602WriteData(*str);
            str++;
      }
}

******************************************************************

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