使用lcd1602能讀取出數據，且光照強度有變化，但是跳變的、并不能線性變化。比如遠近光照強度是幾百的變化。
各人認為是Main 主程序& Bh1750子程序 的問題，請大神們能幫忙指正。
********************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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