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标题: 我的ADS1115错在哪了 [打印本页]

作者: 张衍波 时间: 2015-10-27 18:11
标题: 我的ADS1115错在哪了
ADS读出的值用LCD显示：
第一通道和第四通道0电压显示不正常，655xx，接近AD的最大值。加了电压，反而AD值减小
第二通道和第三通道正常！
#define ADS1115_DEVICE_ADDR                0x90
#defineADA1115_CONVERSION_REG_ADDR       0x00
#define ADA1115_CONFIG_REG_ADDR          0x01
#defineADA1115_Lo_THRESH_REG_ADDR       0x02
#defineADA1115_Ho_THRESH_REG_ADDR       0x03
unsigned int ADS1115_Read(unsigned ad_ch)
{
      unsigned int ad_tmp = 0;
   I2C_Start();
   I2C_SendDAdr(ADS1115_DEVICE_ADDR);
   I2C_Ack();
   I2C_SendDat(ADA1115_CONFIG_REG_ADDR);//写配置寄存器
   I2C_Ack();
   I2C_SendDat(0xc2|((ad_ch&0b00000011)<<4));
   I2C_Ack();
      //I2C_SendDat(0xe2);
   I2C_SendDat(0x82);
   I2C_Ack();

   I2C_stop();

   Delay_us(1000);
   I2C_Start();
   I2C_SendDAdr(ADS1115_DEVICE_ADDR);
      I2C_Ack();
   I2C_SendDat(ADA1115_CONVERSION_REG_ADDR);
   I2C_stop();

   Delay_us(1000);

   I2C_Start();
   I2C_SendDAdr(ADS1115_DEVICE_ADDR+1);
   I2C_Ack();
   ad_tmp |= (unsigned int)I2C_RcvDat()<<8;
   I2C_Ack();
   ad_tmp |= (unsigned int)I2C_RcvDat();
   I2C_NAck()
   I2C_stop();
      return ad_tmp;
}
int main(void)
{
      int i;
   CLK_Init();
   LCD_IO_Init();
   LCD_Init();
   I2C_Init();
   Delay_us(50000);
   Delay_us(50000);

      while (1)
      {
            LCD_Print(1, 0, "0-");
            LCD_Print(0, 0, Int2Str(ADS1115_Read(0)));
            Delay_us(5000);
            LCD_Print(1, 8, "1-");
            LCD_Print(0, 0, Int2Str(ADS1115_Read(1)));
            Delay_us(5000);
            LCD_Print(2, 0, "2-");
            LCD_Print(0, 0, Int2Str(ADS1115_Read(2)));
            Delay_us(5000);
            LCD_Print(2, 8, "3-");
            LCD_Print(0, 0, Int2Str(ADS1115_Read(3)));
            Delay_us(5000);
      }
      return 0;
}转载

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