ADS1115读回通道0和2值会颠倒

jeraw · 发表于 2016-1-25 10:38:43

读参数是正常的，就是值跟管脚对不上，程序也是论友发布的[mw_shl_code=c,true]
#ifndef __ADS1115_H
#define __ADS1115_H
#include "stm32f10x_i2c.h"
#include "stm32f10x_gpio.h"
#define CMD_Write    0x90    //10010000
#define CMD_Read    0x91    //10010001
#define CMD_CONF_REG  0x01    //00000001
#define CMD_POINT_REG 0x00
#define CONF_L       0x83    //11100011  10000011
#define channel_0    0             //表示选择通道0
#define channel_1    1             //表示选择通道1
#define channel_2    2             //表示选择通道2
#define channel_3    3             //表示选择通道2

u16 Get_ATOD (unsigned char channel);
void Confige1115(u8 channel);
void PointRegister (void) ;
u16 ReadData (unsigned char chn);
float display_ADS1(u8 cnt);
float display_ADS2(u8 cnt);

#endif[/mw_shl_code][mw_shl_code=c,true]#include "ads1115.h"
//#include "AD5420_IO.h"
#include "TWI.h"
#include "delay.h"

u16 value=0,value1=0;
u32 Limit_Avoid_filter(u32 last_value,u32 new_value);

//void Confige1115 (unsigned char port);
//void PointRegister (void);
//u16 ReadData (unsigned char chn);
unsigned char WriteIntBuf[4], WritepointBuf[2],ReadBuffer[2];

/*******************************************************************************
* Function Name  : Confige1115
* Description : 延迟时间
* Input       : None
* Output       : None
* Return       : None
* Attention    :获取ADS1115模拟转换结果
*******************************************************************************/
u16 data_get;
u16 dianya_value;
/*******************************************************************************
* Function Name  : Confige1115
* Description : 延迟时间
* Input       : None
* Output       : None
* Return       : None
* Attention    :配置ADS1115
*******************************************************************************/
void Confige1115 (unsigned char port)
{
static unsigned char chnel, i;
switch (port)
{
   case 0:             //0通道
      chnel=0xC2; //11000010
      break;

   case 1:             //1通道
      chnel=0xD2;    //11010010
      break;

   case 2:             //2通道
      chnel=0xE2;    //11100010
      break;

   case 3:             //3通道
      chnel=0xF2;    //11110010
      break;

   default:
      break;
}
WriteIntBuf[0] = CMD_Write;
WriteIntBuf[1] = CMD_CONF_REG;
WriteIntBuf[2] = chnel;
WriteIntBuf[3] = CONF_L;
if(!(TWI_START()))
{
      for(i=0;i<4;i++)
      {
         TWI_SendByte(WriteIntBuf);
         delay_us(1);
      }
}
TWI_STOP();

}
/*******************************************************************************
* Function Name  : PointRegister
* Description : 延迟时间
* Input       : None
* Output       : None
* Return       : None
* Attention    :指向ADS1115指针寄存器用于准备读取数据
*******************************************************************************/
void PointRegister (void)
{
unsigned char i;
WritepointBuf[0] = CMD_Write; //90
WritepointBuf[1] = CMD_POINT_REG; //00
if(!(TWI_START()))
{
      for(i=0;i<2;i++)
      {
      TWI_SendByte(WritepointBuf);
      delay_us(1);
      }
}
TWI_STOP();

}
/*******************************************************************************
* Function Name  : I2C_delay
* Description : 延迟时间
* Input       : None
* Output       : None
* Return       : None
* Attention    :  CH1 PA4  CH2 PA7 CH3 PA6 CH4 PA5
*******************************************************************************/

u16 ReadData (unsigned char chn)
{
u16 data_rece;
switch(chn)
{
   case 0:             //0通道
      if(!(TWI_START()))
      {
            TWI_SendByte(CMD_Read);
            delay_us(1);
            ReadBuffer[0] = TWI_ReceiveByte();
            TWI_SendACK();
            ReadBuffer[1] = TWI_ReceiveByte();
            TWI_SendACK();
            TWI_STOP();
        data_rece=ReadBuffer[0]*256+ReadBuffer[1];
      }
   break;

   case 1:             //1通道
      if(!(TWI_START()))
      {
      TWI_SendByte(CMD_Read);
            delay_us(1);
            ReadBuffer[0] = TWI_ReceiveByte();
            TWI_SendACK();
            ReadBuffer[1] = TWI_ReceiveByte();
            TWI_SendACK();
            TWI_STOP();
      data_rece=ReadBuffer[0]*256+ReadBuffer[1];
      }
   break;

   case 2:             //2通道
      if(!(TWI_START()))
      {
            TWI_SendByte(CMD_Read);
            delay_us(1);
            ReadBuffer[0] = TWI_ReceiveByte();
            TWI_SendACK();
            ReadBuffer[1] = TWI_ReceiveByte();
            TWI_SendACK();
            TWI_STOP();
        data_rece=ReadBuffer[0]*256+ReadBuffer[1];
      }
   break;

   case 3:             //3通道
      if(!(TWI_START()))
      {
            TWI_SendByte(CMD_Read);
            delay_us(1);
            ReadBuffer[0] = TWI_ReceiveByte();
            TWI_SendACK();
            ReadBuffer[1] = TWI_ReceiveByte();
            TWI_SendACK();
            TWI_STOP();
   data_rece=ReadBuffer[0]*256+ReadBuffer[1];
      }
   break;

   default:
   break;
}
return data_rece;
}

u16 Get_ATOD (unsigned char channel)
{
unsigned char chn;
chn = channel;
Confige1115(channel);
delay_us(20);
PointRegister();
delay_us(20);
data_get=ReadData(chn);
delay_us(20);
if(data_get>=0x8000)
dianya_value=0x8000;
else
dianya_value=data_get;
return dianya_value;
}

float display_ADS1(u8 cnt)
{
u32 temp_val=0;
u8 t=0;

float  temp;
value= Get_ATOD(channel_0);

for(t=0;t<cnt;t++)
{
temp_val+=value;
delay_ms(5);
}
value =    temp_val / cnt;
temp= ((float)(value)/32768.0)*4096;
return    temp;
}

float display_ADS2(u8 cnt)
{
u32 temp_val2=0;
u8 t=0;
float  temp;
value1= Get_ATOD(channel_2);
for(t=0;t<cnt;t++)
{
temp_val2+=value1;
delay_ms(5);
}
value1 =    temp_val2 /  cnt;
temp= ((float)(value1)/32768.0)*4096;
return    temp;
}

#define A_N 8
#define A_A 50
//限幅值+消抖滤波
u32 Limit_Avoid_filter(u32 last_value,u32 new_value)
{
static u32 result_value;
if((new_value-last_value)>A_A||(last_value-new_value)>A_A) //消除局部小跳动
{
   result_value = last_value;
}
else
   result_value = new_value;
   return result_value;

}
[/mw_shl_code]