#include<msp430x14x.h>
#define uchar unsigned char
#define uint unsigned int
#define SDA_1 P3OUT|=BIT1 // P3.1为SDA
#define SDA_0 P3OUT&=~BIT1
#define SCL_1 P3OUT |= BIT0 //P3.0为SCL
#define SCL_0 P3OUT &= ~BIT0
#define DIR_IN P3DIR &= ~BIT1
#define DIR_OUT P3DIR |= BIT1
#define SDA_IN ((P3IN >> 1) & 0x01)
#define dis_data P5OUT //数码管输出
#define TIME 5
#define SlaveAddress 0xA6
uchar seg_bcd[] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e}; //数码管
void delay_nms(unsigned int k)//延时k毫秒
{
unsigned int i,j;
for(i=0;i<k;i++)
{
for(j=0;j<121;j++)
{;}
}
}
void Delay(unsigned int n) //延时
{
unsigned int i;
for(i = 0;i < n;i++)
{
;
}
}
void BH1750_Start() //起始信号
{
DIR_OUT;
SDA_1;
delay_nms(5);
SCL_1;
Delay(TIME);
SDA_0;
Delay(TIME);
SCL_0;
}
void BH1750_Stop() //结束信号
{
DIR_OUT;
SDA_0;
Delay(TIME);
SCL_1;
Delay(TIME);
SDA_1; }
void BH1750_SendACK() //发送Ack
{
SCL_0;
DIR_OUT;
SDA_0;
Delay(TIME);
SCL_1;
Delay(TIME);
SCL_0;
}
void BH1750_RecvACK() //接受ACK
{ SCL_1;
Delay(TIME);
DIR_IN;
while(SDA_IN);
DIR_OUT;
SCL_0;
Delay(TIME);
}
void BH1750_SendByte(uchar dat) //发送一个字节
{ DIR_OUT;
unsigned int i;
for(i = 0;i < 8;i++)
{
SCL_0;
Delay(TIME);
if((dat >> 7) & 0x01) SDA_1;
else SDA_0;
Delay(TIME);
SCL_1;
Delay(TIME);
dat <<= 1; //数据左移一位,进入下一轮送数
}
Delay(TIME);
}
uchar BH1750_RecvByte() //接受一个字节
{
uchar i;
uchar dat = 0;
uchar datbit=0;
SCL_0;
Delay(TIME);
SDA_1;
DIR_IN;
for (i=0; i<8; i++)
{
SCL_1;
Delay(TIME);
datbit = SDA_IN;
Delay(TIME);
dat = ((dat << 1) | datbit);
SCL_0;
Delay(TIME);
}
return dat;
}
void Single_Write_BH1750(uchar REG_Address) //写入
{
BH1750_Start();
BH1750_SendByte(SlaveAddress);
BH1750_SendByte(REG_Address);
// BH1750_SendByte(REG_data);
BH1750_Stop();
}
void main()
{ uchar tmp;
float temp;
int t;
WDTCTL = WDTPW + WDTHOLD;
P5DIR |= 0Xff;
P4DIR |= 0x01;
P5OUT |= 0x00;
delay_nms(200);
Single_Write_BH1750(0x01);
Single_Write_BH1750(0x10);
while(1)
{ Single_Write_BH1750(0x01);
Single_Write_BH1750(0x10);
delay_nms(180);
tmp=BH1750_RecvByte();
temp=(float)tmp;
t=temp/100;
dis_data=seg_bcd[t];
}
} |
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