ADS7953EVM-PDK: Mode control programming not effective

Hey,

I'm trying to talk to ADS7953 over SPI from my nRF52832. I'm programming it in auto2 mode and am using the code below to program it. 
First, I try to program the range for auto2 mode to 5 channels, so I send a 0x9140 (ADS7953_PROG_AUTO2 | AUTO2_CHANRNG_SEL_5). 
Then I send the mode control register data as 0x3C40 (ADS7953_AUTO_MODE2 | AUTO2_PROG_ENABLE | AUTO2_CHAN_COUNT_RESET | AUTO2_5VRANGE_SEL | AUTO2_NORM_OP_SEL | AUTO2_CHAN_ADDY_SEL).
I start seeing a stream of data but I see all channels (as in screenshot). Whatever value for channel range I try, I always see all 16 channels. This also makes me skeptic whether the data that I see is correct or not. I also noticed that even for a 5V range, I see 0x0FFF with 4V. 
What am I doing wrong here?

Thanks for your help,
Vandita


  nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
  spi_config.ss_pin   = SPI_SS_PIN;
  spi_config.miso_pin = SPI_MISO_PIN;
  spi_config.mosi_pin = SPI_MOSI_PIN;
  spi_config.sck_pin  = SPI_SCK_PIN;
  spi_config.frequency = NRF_DRV_SPI_FREQ_125K;; //slow it down!
  spi_config.mode = NRF_DRV_SPI_MODE_1; // try different modes
  APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler));
  
  printf("\r\nStart: \r\n");
  
  // Reset rx buffer and transfer done flag
  memset(m_rx_buf, 0, m_length);
  spi_xfer_done = false;
  // Request programming access for Auto Mode 2 and set the range to all channels
  uint16_t prg_wrd = ADS7953_PROG_AUTO2 | AUTO2_CHANRNG_SEL_5;

  APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, (uint8_t*)&prg_wrd, m_length, NULL, 0));
  
  while (!spi_xfer_done)
  {
    __WFE();
  }
  
  // Program Auto Mode 2
  memset(m_rx_buf, 0, m_length);
  spi_xfer_done = false;
  prg_wrd = ADS7953_AUTO_MODE2 | AUTO2_PROG_ENABLE | AUTO2_CHAN_COUNT_RESET | AUTO2_5VRANGE_SEL | AUTO2_NORM_OP_SEL | AUTO2_CHAN_ADDY_SEL;
  
  APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, (uint8_t*)&prg_wrd, m_length, NULL, 0));
  
  while (!spi_xfer_done)
  {
    __WFE();
  }
  
  
  // Write 0x0000 to ADS7953 to continue collecting data with the programmed parameters
  prg_wrd = ADS7953_CONT_OP;
  while (1)
  {
    memset(m_rx_buf, 0, m_length);
    spi_xfer_done = false;
    APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, (uint8_t*)&prg_wrd, m_length, m_rx_buf, m_length));
    
    while (!spi_xfer_done)
    {
      __WFE();
    }
  }

Screenshot -
2 is the number of bytes received and then data is printed in next line, MSB first.