请问AD7327始终只输出CH0的AD值是什么问题？

我按照官网的程序来写，在main函数里初始化。

	AD7327_Pin_Configuration();
	WriteToRangeRegister1 (IN10vCH0, IN10vCH1, IN10vCH2, IN10vCH3);
	WriteToRangeRegister2 (IN10vCH4, IN10vCH5, IN10vCH6, IN10vCH7);

之后，在while(1)循环里调用dout = ADC_Read(CH1),发现，无论我是读CH1还是其它AD通道，始终只输出CH0通道的AD值，请问我这问题出在哪？
u16 ADC_Read(u16 ch)
{
  u16 ReturnData = 0x0000;
  switch(ch)
  {
  case CH0:
  ReturnData = WriteToSequenceRegister (VIN0);
  ReturnData = WriteToControlRegister(CH0, Mode0, Normal, StraightBinary, Ref_En, SequencerOff);
  ReturnData = ReadSequence();
  break;
  case CH1:
  ReturnData = WriteToSequenceRegister (VIN1);
  delay_us(1000);
  ReturnData = WriteToControlRegister(CH1, Mode0, Normal, StraightBinary, Ref_En, SequencerOff);
  delay_us(1000);
  ReturnData = ReadSequence();
  delay_us(10);
  break;
  case CH2:
  ReturnData = WriteToSequenceRegister (VIN2);
  ReturnData = WriteToControlRegister(CH2, Mode0, Normal, StraightBinary, Ref_En, SequencerOff);
  break;
  case CH3:
  ReturnData = WriteToSequenceRegister (VIN3);
  ReturnData = WriteToControlRegister(CH3, Mode0, Normal, StraightBinary, Ref_En, SequencerOff);
  break;
  case CH4:
  ReturnData = WriteToSequenceRegister (VIN4);
  ReturnData = WriteToControlRegister(CH4, Mode0, Normal, StraightBinary, Ref_En, SequencerOff);
  break;
  case CH5:
  ReturnData = WriteToSequenceRegister (VIN5);
  ReturnData = WriteToControlRegister(CH5, Mode0, Normal, StraightBinary, Ref_En, SequencerOff);
  break;
  case CH6:
  ReturnData = WriteToSequenceRegister (VIN6);
  ReturnData = WriteToControlRegister(CH6, Mode0, Normal, StraightBinary, Ref_En, SequencerOff);
  break;
  case CH7:
  ReturnData = WriteToSequenceRegister (VIN7);
  ReturnData = WriteToControlRegister(CH7, Mode0, Normal, StraightBinary, Ref_En, SequencerOff);
  break;
  default:
  break;
  }
  return ReturnData;

}