ADE7878有效值数据读取失败的原因？怎么解决？

目前在做一个项目用到ADE7878芯片，调试过程中遇到以下几点问题：
1、实测AVDD无输出，DVDD输出2.5V；
2、采用内部ref基准，但是REF管脚只输出0.8V;如图所示，本来是采用外部基准，但是外部Ref参考电压设计成2.5V，已经割线，并外接4.7uf去耦电容。
3、VAP/VBP/VCP调理电路前输入市电227V左右，调理后实际峰值为450mV左右，但是AVRMS/BVRMS/CVRMS读取全为0；
  
  
软件上按照官网参考demo，初始化完成后，IRQ1中断上电后产生一次中断，IRQ0中断每隔一段时间产生一次，这些都没有问题，另外SPI通讯确认没有问题；主要问题就是读取有效值没有数据产生；
  
  App_WriteReg()函数已经对寄存器的读写的数据长度 做了处理；   
  
void App_InitConfig(void)
{
App_WriteReg(GAIN,0x0000);      //config the  Gain of the PGA , which is before the ADC of ADE7878
App_WriteReg(CONFIG2,0x00);     //
App_WriteReg(HPFDIS,0x0000);     //enabled high-pass filters
App_WriteReg(VLEVEL,491520);

App_WriteReg(AIGAIN,0x00000000);    //calibration
App_WriteReg(AVGAIN,0x00000000);
App_WriteReg(BIGAIN,0x00000000);
App_WriteReg(BVGAIN,0x00000000);
App_WriteReg(CIGAIN,0x00000000);
App_WriteReg(CVGAIN,0x00000000);
App_WriteReg(NIGAIN,0x00000000);
  App_WriteReg(AIRMSOS,0x00000000);
App_WriteReg(AVRMSOS,0x00000000);
App_WriteReg(BIRMSOS,0x00000000);
App_WriteReg(BVRMSOS,0x00000000);
App_WriteReg(CIRMSOS,0x00000000);
App_WriteReg(CVRMSOS,0x00000000);
App_WriteReg(NIRMSOS,0x00000000);
  App_WriteReg(AWGAIN,0x00000000);
App_WriteReg(AWATTOS,0x00000000);
App_WriteReg(BWGAIN,0x00000000);
App_WriteReg(BWATTOS,0x00000000);
App_WriteReg(CWGAIN,0x00000000);
App_WriteReg(CWATTOS,0x00000000);
App_WriteReg(APHCAL,0x0000);
App_WriteReg(BPHCAL,0x0000);
App_WriteReg(CPHCAL,0x0000);
App_WriteReg(CF1DEN,0x00A7);    //configure the ENERGY-TO-FREQUENCY
App_WriteReg(CF2DEN,0x00A7);
App_WriteReg(CF3DEN,0x00A7);
App_WriteReg(CFMODE,0x0E88);   //CF1-total active power, disable; CF2-total reactvie power, disable; CF3- fundamental avtive power, disable
App_WriteReg(ACCMODE,0x0000);
App_WriteReg(COMPMODE,0x01FF);
App_WriteReg(MMODE,0x00);
App_WriteReg(WTHR0,0x007BBE61);  //PMAX = 33,516,139   0.001WH/LSB  //page 47 datasheet Rev. E            
App_WriteReg(WTHR1,0x00000017);
App_WriteReg(VATHR0,0x007BBE61); //PMAX = 33,516,139
App_WriteReg(VATHR1,0x00000017);
App_WriteReg(VARTHR0,0x007BBE61); //PMAX = 33,516,139
App_WriteReg(VARTHR1,0x00000017);
  App_WriteReg(LCYCMODE,0x0F);   //phase A is selected for zero cross
App_WriteReg(LINECYC,0x0064);
  App_WriteReg(MASK0,0x00020020);  //IRQ0 interru enable
App_WriteReg(MASK1,0x00000000);   
App_WriteReg(MASK1,0x00000000);
App_WriteReg(MASK1,0x00000000);
}
#define TaskMeasure_Release_Ticks  10//ÈÎÎñÊÍ·ÅCPUµÄtickÊý
void  MeasureTask (void  *parg)
{
//INT8U *msg;
unsigned char i = 0;

OSTimeDly(100);

Ade7878_SPIInit();
App_InitConfig();
App_WriteReg(RUN,0x0001);
delay_ms(100);

    while(1)
    {  
  if(ucIRQ0Flag == 1)
  {
   ucIRQ0Flag = 0;
   Ade7878_CheckSTATUS0();                  //这里可以进去
   App_ReadUserData();
  }
   IWDG_Feed();//feed dog
  OSTimeDly(TaskMeasure_Release_Ticks);   /*  ÊÍ·ÅCPU  */
    }
}