/*
* ADS1115.h
*
* Created on: 2012-7-30
* Author: Piao
*/
#ifndef ADS1115_H_
#define ADS1115_H_
/**********ADDR宏定义***************/
#define ADDRESS_0 0x90 //ADDR PIN ->GND
#define ADDRESS_1 0x92 //ADDR PIN ->VDD
#define ADDRESS_2 0x94 //ADDR PIN ->SDA
#define ADDRESS_3 0x96 //ADDR PIN ->SCL
/************POINTER REGISTER*****************/
#define Pointer_0 0x00 //Convertion register
#define Pointer_1 0x01 //Config register
#define Pointer_2 0x02 //Lo_thresh register
#define Pointer_3 0x03 //Hi_thresh register
/************CONFIG REGISTER*****************/
#define OS_0 0x0000
#define OS_1 0x8000
#define MUX_0 0x0000 //AINp=AIN0, AINn=AIN1
#define MUX_1 0x1000 //AINp=AIN0, AINn=AIN3
#define MUX_2 0x2000 //AINp=AIN1, AINn=AIN3
#define MUX_3 0x3000 //AINp=AIN2, AINn=AIN3
#define MUX_4 0x4000 //AINp=AIN0, AINn=GND
#define MUX_5 0x5000 //AINp=AIN1, AINn=GND
#define MUX_6 0x6000 //AINp=AIN2, AINn=GND
#define MUX_7 0x7000 //AINp=AIN3, AINn=GND
#define PGA_0 0x0000 //FS=6.144V
#define PGA_1 0x0200 //FS=4.096V
#define PGA_2 0x0400 //FS=2.048V
#define PGA_3 0x0600 //FS=1.024V
#define PGA_4 0x0800 //FS=0.512V
#define PGA_5 0x0A00 //FS=0.256V
#define PGA_6 0x0C00 //FS=0.256V
#define PGA_7 0x0E00 //FS=0.256V
#define MODE_0 0x0000
#define MODE_1 0x0100
#define DR_0 0x0000 //Data Rate = 8
#define DR_1 0x0020 //Data Rate = 16
#define DR_2 0x0040 //Data Rate = 32
#define DR_3 0x0060 //Data Rate = 64
#define DR_4 0x0080 //Data Rate = 128
#define DR_5 0x00A0 //Data Rate = 250
#define DR_6 0x00C0 //Data Rate = 475
#define DR_7 0x00E0 //Data Rate = 860
#define COMP_MODE_0 0x0000
#define COMP_MODE_1 0x0010
#define COMP_POL_0 0x0000
#define COMP_POL_1 0x0008
#define COMP_LAT_0 0x0000
#define COMP_LAT_1 0x0040
#define COMP_QUE_0 0x0000
#define COMP_QUE_1 0x0001
#define COMP_QUE_2 0x0002
#define COMP_QUE_3 0x0003
void Delay(void);
void Delay_1ms(void);
void Start(void);
void Stop(void);
void ACK(void);
void NACK(void);
unsigned char Check(void);
void Write_1_Byte(unsigned char DataByte);
unsigned char Write_N_Byte(unsigned char *writebuffer,unsigned char n);
unsigned char Read_1_Byte(void);
void Read_N_Byte(unsigned int *readbuff,unsigned char n);
void InitADS1115(void);
void WriteWord(void);
void ReadWord(void);
void ADS1115(void);
void ShowInt(long int x);
#endif /* ADS1115_H_ */
#include <MSP430F149.h>
#include "ADS1115.h"
/************************************
* ADDR---> GND
* VDD ---> 3.3V
* SCL ---> P2.6
* SDA ---> P2.7
* AINp=AIN0, AINn=GND
************************************/
/***************引脚定义*****************/
#define SCL 0x40
#define SDA 0x80
#define SCL_SEL P2SEL &= ~SCL
#define SCL_DDR_OUT P2DIR |= SCL
#define SCL_OUT P2OUT
#define SCL_H SCL_OUT |= SCL
#define SCL_L SCL_OUT &= ~SCL
#define SDA_SEL P2SEL &= ~SDA
#define SDA_DDR_OUT P2DIR |= SDA
#define SDA_DDR_IN P2DIR &= ~SDA
#define SDA_OUT P2OUT
#define SDA_IN P2IN
#define SDA_H SDA_OUT |= SDA
#define SDA_L SDA_OUT &= ~SDA
#define TRUE 1
#define FALSE 0
/*************ADDR Initial********************/
#define ADDRESS ADDRESS_0 //ADDR PIN ->GND
#define ADDRESS_W ADDRESS |0x00 //写地址
#define ADDRESS_R ADDRESS|0x01 //读地址
/*************Config Initial*********************/
#define OS OS_1
#define MUX MUX_4 //AINp=AIN0, AINn=GND
#define PGA PGA_0 //FS=6.144V
#define DR DR_7 //Data Rate = 860
#define COMP_QUE COMP_QUE_3
unsigned int Config;
unsigned char Writebuff[4],Readbuff[3];
unsigned int Result[2];
int D_ADS; //转换的数字量
float VIN_DAS; //输入的电压值
unsigned char t_DAS;
int Format[5]={0}; //转换的数字量转换成十进制
/*******************************************
函数名称：delay
功 能：延时约15us的时间
参 数：无
返回值 ：无
********************************************/
void Delay(void)
{
unsigned char i;
for(i = 0;i < 15;i++)
_NOP();
}
/******************延时1ms的时间*********************/
void Delay_1ms(void)
{
unsigned char i;
for(i = 150;i > 0;i--) _NOP();
}
/*******************************************
函数名称：Start
功 能：完成IIC的起始条件操作
参 数：无
返回值 ：无
********************************************/
void Start(void)
{
SCL_H;
SDA_H;
Delay();
SDA_L;
Delay();
SCL_L;
Delay();
}
/*******************************************
函数名称：Stop
功 能：完成IIC的终止条件操作
参 数：无
返回值 ：无
********************************************/
void Stop(void)
{
SDA_L;
Delay();
SCL_H;
Delay();
SDA_H;
Delay();
}
/*******************************************
函数名称：ACK
功 能：完成IIC的主机应答操作
参 数：无
返回值 ：无
********************************************/
void ACK(void)
{
SDA_L;
_NOP(); _NOP();
SCL_H;
Delay();
SCL_L;
_NOP(); _NOP();
SDA_H;
Delay();
}
/*******************************************
函数名称：NACK
功 能：完成IIC的主机无应答操作
参 数：无
返回值 ：无
********************************************/
void NACK(void)
{
SDA_H;
_NOP(); _NOP();
SCL_H;
Delay();
SCL_L;
_NOP(); _NOP();
SDA_L;
Delay();
}
/**********检查应答信号函数******************/
/*如果返回值为1则证明有应答信号，反之没有*/
/*******************************************
函数名称：Check
功 能：检查从机的应答操作
参 数：无
返回值 ：从机是否有应答：1--有，0--无
********************************************/
unsigned char Check(void)
{
unsigned char slaveack;
SDA_H;
_NOP(); _NOP();
SCL_H;
_NOP(); _NOP();
SDA_DDR_IN;
_NOP(); _NOP();
slaveack = SDA_IN&SDA; //读入SDA数值
SCL_L;
Delay();
SDA_DDR_OUT;
if(slaveack) return FALSE;
else return TRUE;
}
/***************Write a Byte****************/
void Write_1_Byte(unsigned char DataByte)
{
int i;
for(i=0;i<8;i++)
{
if(DataByte&0x80) //if((DataByte<<i)&0x80)
SDA_H;
else
SDA_L;
Delay();
SCL_H;
Delay();
SCL_L;
Delay();
DataByte <<= 1;
}
SDA_H;
_NOP();
}
/***************Write N Byte****************/
unsigned char Write_N_Byte(unsigned char *writebuffer,unsigned char n)
{
int i;
for(i=0;i<n;i++)
{
Write_1_Byte(*writebuffer);
if(Check())
{
writebuffer ++;
}
else
{
Stop();
return FALSE;
}
}
Stop();
return TRUE;
}
/***************Read a Byte****************/
unsigned char Read_1_Byte(void)
{
unsigned char data=0,FLAG, i;
for(i=0;i<8;i++)
{
SDA_H;
Delay();
SCL_H;
SDA_DDR_IN; //端口为输入
Delay();
FLAG=SDA_IN& SDA;
data <<= 1;
if( FLAG)
data |= 0x01;
SDA_DDR_OUT;
SCL_L;
Delay();
}
return data;
}
/***************Read N Byte****************/
void Read_N_Byte(unsigned int*readbuff,unsigned char n)
{
unsigned char i;
for(i=0;i<n;i++)
{
readbuff[i]=Read_1_Byte();
if(i==n-1)
NACK(); //不连续读字节
else
ACK(); //连续读字节
}
Stop();
}
/*****************初始化******************/
void InitADS1115(void)
{
SCL_SEL;
SDA_SEL;
SCL_DDR_OUT;
SDA_DDR_OUT;
SDA_H;
Config = OS+MUX+PGA+DR+COMP_QUE;
Writebuff[0]=ADDRESS_W;
Writebuff[1]=Pointer_1;
Writebuff[2]=Config/256;
Writebuff[3]=Config%256;
Readbuff[0]=ADDRESS_W;
Readbuff[1]=Pointer_0;
Readbuff[2]=ADDRESS_R;
}
/***************Write a Word***********************/
void WriteWord(void)
{
int t;
Start(); //写入4个字节
do
{
t=Write_N_Byte(Writebuff,4);
}while(t==0);
}
/***************Read Word***********************/
void ReadWord(void)
{
int t;
Start(); //写入2个字节
do
{
t=Write_N_Byte(Readbuff,2);
}while(t==0);
Start(); //写入2个字节
do
{
t=Write_N_Byte(&Readbuff[2],1);
}while(t==0);
Read_N_Byte(Result,2); //读出2个字节
}
/***************ADS1115********************/
void ADS1115(void)
{
InitADS1115();
WriteWord();
Delay_1ms();
ReadWord();
D_ADS=Result[0]*256+Result[1]; //转换的数字量
t_DAS=0;
ShowInt(D_ADS); //转换的数字量转换成十进制
VIN_DAS=6.144*D_ADS/32768; //输入的电压值
}
//用递归方法将正整数x转换为10进制格式
void ShowInt(long int x)
{
if(x)
{
Format[t_DAS]= x%10;
t_DAS ++;
ShowInt(x/10);
}
}
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