ADS1115在STM32下的使用

采用IO模拟I2C读写时序，程序如下图所示

#include "stm32f10x_lib.h"
#include "ads1115.h"
//#include "ap_i2c.h"
static void Confige1115 (unsigned char port);
static void PointRegister (void);
static u16 ReadData (unsigned char chn, unsigned char cnt);
unsigned char WriteIntBuf[4], WritepointBuf[2], count = 6,ReadBuffer[64];;
void delay (unsigned int delay)
{
   while(delay--);  
}

/*******************************************************************************
* 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;
float dianya;
float Get_ATOD (unsigned char channel,unsigned char cnt)
{
    static unsigned char chn;
    
    chn = channel;  
    Confige1115(channel);
    delay(1000);
    PointRegister();
    delay(1000);
    data_get=ReadData(chn,cnt);
    delay(1000);	if(data_get>=0x8000)	dianya=((float)(0xffff-data_get)/32768.0)*4.096;	else	dianya=((float)data_get/32768.0)*4.096;	return dianya;    
}
/*******************************************************************************
* Function Name  : Confige1115
* Description    : 延迟时间
* Input          : None
* Output         : None
* Return         : None
* Attention		 :配置ADS1115
*******************************************************************************/
static void Confige1115 (unsigned char port)
{
    static unsigned char chnel, i;
    switch (port)
    {
      case 0:               //0通道
          chnel=0xC2;
      break;
      
      case 1:               //1通道  
          chnel=0xD2;
      break;
          
      case 2:               //2通道  
          chnel=0xE2;
      break;
          
      case 3:               //3通道
          chnel=0xF2;
      break;
          
      default:
      break;	
    }
    WriteIntBuf[0] = CMD_Write;//0x90
    WriteIntBuf[1] = CMD_CONF_REG;//0x01
    WriteIntBuf[2] = chnel;// tongdao
    WriteIntBuf[3] = CONF_L;//0xe3
    if(!(TWI_START()))
    {
        for(i=0;i<4;i++)
        {
            TWI_SendByte(WriteIntBuf[i]);
         delay(20);
        }
    }
    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
*******************************************************************************/
static 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[i]);
          delay(20);
        }
    }
   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
*******************************************************************************/

static u16 ReadData (unsigned char chn,unsigned char cnt)
{  u16 data_rece;
   switch(chn)
   {
      case 0:               //0通道
        if(!(TWI_START()))
          {  	if(count == 0xff)
            		count = 6;
    
              TWI_SendByte(CMD_Read); 
              delay(20);
               ReadBuffer[cnt * 8] = TWI_ReceiveByte(); 
              TWI_SendACK();
               ReadBuffer[(cnt * 8) + 1] = TWI_ReceiveByte();
              TWI_SendACK();
            
              TWI_STOP();
       	data_rece=ReadBuffer[cnt * 8]*256+ReadBuffer[(cnt * 8) + 1];
              //ReadBuffer[56]|=(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_4) << count);
          }
      break;
      
      case 1:               //1通道  
          if(!(TWI_START()))
          {    TWI_SendByte(CMD_Read); 
              delay(20);
              ReadBuffer[(cnt * 8) + 2] = TWI_ReceiveByte(); 
              TWI_SendACK();
           
              ReadBuffer[(cnt * 8) + 3] = TWI_ReceiveByte();
              TWI_SendACK();
              TWI_STOP();
          				data_rece=ReadBuffer[(cnt * 8) + 2]*256+ReadBuffer[(cnt * 8) + 3];
              //ReadBuffer[57]|=(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_7) << count);
          }
      break;
          
      case 2:               //2通道  
         if(!(TWI_START()))
          {   
              TWI_SendByte(CMD_Read); 
              delay(20);
              ReadBuffer[(cnt * 8) + 4] = TWI_ReceiveByte(); 
              TWI_SendACK();
             // I2C_delay(20);
      
              ReadBuffer[(cnt * 8) + 5] = TWI_ReceiveByte();
              TWI_SendACK();
              TWI_STOP();
        						data_rece=ReadBuffer[(cnt * 8) + 4]*256+ReadBuffer[(cnt * 8) + 5];
              //ReadBuffer[59]|=(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_5) << count);
          }
      break;
          
      case 3:               //3通道
        if(!(TWI_START()))
          {     
              TWI_SendByte(CMD_Read); 
               delay(20);
            // I2C_delay(20);
              ReadBuffer[(cnt * 8) + 6] = TWI_ReceiveByte(); 
              TWI_SendACK();
            //  I2C_delay(20);
      
              ReadBuffer[(cnt * 8) + 7] = TWI_ReceiveByte();
              TWI_SendACK();
              TWI_STOP();
       							data_rece=ReadBuffer[(cnt * 8) + 6]*256+ReadBuffer[(cnt * 8) + 7];
              //ReadBuffer[58]|=(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_6) << count--);
          }
      break;
          
      default:
      break;	
   }return data_rece;
}

呵呵, 楼主应该简要分析和说明一下这一大段的代码

注释不错，就是不知道效果怎样呢