Trouble configuring ADGS1409 with Arduino/ESP32

I am trying to use the ADGS1409 with an Arduino Uno and also with an ESP32. I want to initially set the channel to S1 and once I am done with that I will add a loop to cycle through the other channels using the burst mode but for some reason I am unable to set up channel 1. For now I am setting all the other error config bits to zero as I just want to get this to work and will later enable them. I have tried it with the SDP-S board and ACE software to test the functionality of the board and it worked. I am currently using only the single supply mode by providing 12v to VDD and GND to GND and VSS. The EXT_VAL pin is connected to the arduinos 5V output pin and I am supplying 3.3v to S1A and connecting S1B to GND.

I would like your help to figure out where I've gone wrong or where I've made any mistakes and also to know if I have missed anything in this post.

This is the Arduino Code:

#include <SPI.h>

#define SS 10
const byte sw_add = 0b00000001;
const byte sw_ch1 = 0b00000001;
const byte err_add = 0b00000010;
const byte err_val = 0b00000000;

void setup() {
  Serial.begin(115200);
  digitalWrite(SS, HIGH);
  SPI.begin();
  //SPI.setClockDivider(SPI_CLOCK_DIV4);
    SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE0));
  digitalWrite(SS, LOW);
  SPI.transfer(err_add);
  SPI.transfer(err_val);
  digitalWrite(SS, HIGH);
  digitalWrite(SS, LOW);
  SPI.transfer(sw_add);
  SPI.transfer(sw_ch1);
  digitalWrite(SS, HIGH);
  SPI.endTransaction();
}

void loop() {
  // put your main code here, to run repeatedly:


}

This is the ESP32 Code:

#include <SPI.h>


#define VSPI_MISO   19
#define VSPI_MOSI   18
#define VSPI_SCLK   5
#define VSPI_SS     21
const uint16_t SW_DataWrite = 0x0101;
const uint16_t SW_DataRead = 0x8100;
const uint16_t ERR_Config = 0x0200;
static const int spiClk = 100000; // 100 kHz

//uninitalised pointers to SPI objects
SPIClass * vspi = NULL;

void setup() {
   //clock miso mosi ss
  Serial.begin(115200);
  Serial.println("SPI config begin");
  vspi->begin(VSPI_SCLK, VSPI_MISO, VSPI_MOSI, VSPI_SS);

  //initialise vspi with default pins
  //SCLK = 18, MISO = 19, MOSI = 23, SS = 5
  //vspi->begin();
  //set up slave select pins as outputs as the Arduino API
  //doesn't handle automatically pulling SS low
  pinMode(VSPI_SS, OUTPUT);
  Serial.println("SPI init done");

  // To configure registers
  Serial.println("Configuring registers ...");
  vspiCommand(ERR_Config);
  vspiCommand(SW_DataWrite);

}

// the loop function runs over and over again until power down or reset
void loop() {
  
  //uint16_t reg_value = vspiCommand(SW_DataRead);
  //Serial.println(reg_value);
  
  //delay(100);
}


uint16_t vspiCommand(uint16_t command) {
  uint16_t read_data;
  vspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
  digitalWrite(VSPI_SS, LOW);
  read_data = vspi->transfer16(command);
  digitalWrite(VSPI_SS, HIGH);
  vspi->endTransaction();
  return read_data;  
}