CC2530 模拟I2C的BH1750FVI光照传感器的驱动程序-第2页回答

CC2530 模拟I2C的BH1750FVI光照传感器的驱动程序

2020-01-14 18:52发布

第二次发代码，希望能帮助到有需要的朋友，花了我好久才搞通，其中各种错误呜呜~~
/******************************************
描述；模拟I2C，光照传感器驱动代码
作者；leon_wf
时间；2011.7.21

********************************************/

#include <stdio.h>
#include <io.h>
#include "cc2530_sfr.h"

#define st(x)    do { x } while (__LINE__ == -1)
#define HAL_IO_SET(port, pin, val)       HAL_IO_SET_PREP(port, pin, val)
#define HAL_IO_SET_PREP(port, pin, val) st( P##port##_##pin## = val; )
#define HAL_IO_GET(port, pin) HAL_IO_GET_PREP( port,pin)
#define HAL_IO_GET_PREP(port, pin) ( P##port##_##pin)

#define LIGHT_SCK_0() HAL_IO_SET(1,4,0)
#define LIGHT_SCK_1() HAL_IO_SET(1,4,1)
#define LIGHT_DTA_0() HAL_IO_SET(1,3,0)
#define LIGHT_DTA_1() HAL_IO_SET(1,3,1)

#define LIGHT_DTA() HAL_IO_GET(1,3)
#define LIGHT_SCK()       HAL_IO_GET(1,4)

#define SDA_W() (P1DIR |=BV(3)  )
#define SDA_R() (P1DIR &=~BV(3) )
#define delay() {asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");}

/****command********/
#define DPOWR  0X00       //断电
#define POWER  0X01       //SHANG DIAN
#define RESET 0X07       //CHONG ZHI
#define CHMODE  0X10       //连续H分辨率
#define CHMODE2 0X11       //连续H分辨率2
#define CLMODE 0X13          //连续低分辨
#define H1MODE 0X20          //一次H分辨率
#define H1MODE2 0X21       //一次H分辨率2
#define L1MODE 0X23          //一次L分辨率模式

void delay_nus(void)
{
int i;
int n=100;
for(i=0;i<n;i++)//延迟32NOP为1US
{
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
}
}

void delay_nms(int n)
{
while(n--)
{
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
asm("nop");asm("nop");asm("nop");asm("nop");
}
}

/****************************
启动I2C
数据在时钟高电平的时候从高往低跃变

*****************************/

void start_i2c(void)
{
SDA_W() ;
//LIGHT_SCK_0() ;
//delay_nus(20);
LIGHT_DTA_1();
//delay_nus()  ;
LIGHT_SCK_1() ;
delay_nus() ;
LIGHT_DTA_0() ;
delay_nus()  ;
LIGHT_SCK_0() ;
delay_nus()  ;

//delay()  ;
}

/********************************

结束I2C

数据在时钟高电平的时候从低往高跃变
********************************/

void stop_i2c(void)
{
SDA_W() ;
LIGHT_DTA_0() ;
delay_nus();
LIGHT_SCK_1() ;
delay_nus();
LIGHT_DTA_1() ;
delay_nus();
LIGHT_SCK_0() ;
delay_nus();

}

/******************************
发送字节并且判断是否收到ACK
当收到ACK返回为0，否则返回为1

******************************/

char i2c_send(unsigned char val)
{
int i;
int ack;
char error=0;
SDA_W();
for(i=0x80;i>0;i/=2)
{
if(val&i)
LIGHT_DTA_1();
else
LIGHT_DTA_0();
delay_nus();
LIGHT_SCK_1() ;
delay_nus();
LIGHT_SCK_0() ;
delay_nus();

}

LIGHT_DTA_1();
SDA_R();
//delay_nus();
LIGHT_SCK_1() ;
delay_nus();
if(LIGHT_DTA())
error=1;
delay_nus();
LIGHT_SCK_0() ;
return error;

}

/***************************

读取I2C的字节，并且发送ACK
当参数为1的时候发送一个ACK(低电平)

***************************/

char i2c_read(char ack)
{
int i;
char val=0;
LIGHT_DTA_1();
//SDA_R();
for(i=0x80;i>0;i/=2)
{

LIGHT_SCK_1() ;
delay_nus();
SDA_R();
if(LIGHT_DTA())
val=(val|i);
delay_nus();
LIGHT_SCK_0() ;
delay_nus();

}
SDA_W();
if(ack)
LIGHT_DTA_0();
else
LIGHT_DTA_1();
delay_nus();
LIGHT_SCK_1() ;
delay_nus();
LIGHT_SCK_0() ;
LIGHT_DTA_1();
return val;

}

/**************************
测量光张强度

***************************/

unsigned char
get_light(void)
{
unsigned char ack1=1;
unsigned char ack2=1;
unsigned char ack3=1;
unsigned char ack4=1;
unsigned char ack5=1;
unsigned char ack6=1;
unsigned char ack7=1;
unsigned char ack8=1;

unsigned char t0;
unsigned char t1;
unsigned char t;
int i;
P1DIR|=BV(4);
delay_nms(200);

start_i2c();
ack1=i2c_send(0x46);
if(ack1)
return 255;
ack2=i2c_send(0x01);
if(ack2)
return 254;
stop_i2c();          //init
start_i2c();
ack3=i2c_send(0x46);
if(ack3)
return 253;
ack4=i2c_send(0x01);
if(ack4)
return 252;
stop_i2c();//power
start_i2c();
ack5=i2c_send(0x46);
if(ack5)
return 251;
ack6=i2c_send(0x10);
if(ack6)
return 250;
stop_i2c();//发送测量命令

delay_nms(1500);
start_i2c();

ack7=i2c_send(0x47); //发送地址

if(ack7)
return 249;

t0=i2c_read(1);
t1=i2c_read(0);
stop_i2c();
t=(((t0<<8)|t1)/1.2);
return t;

}

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