SC16IS750 SPI connection and receiving no output

Development Boards Arduino
1

Hello,

I want to send data via the SPI to the SC160IS750 and get the data back via UART.

This is my current connection:

I2C/SPI - GND

A0/CS - PIN 10

A1/SI - MISO PIN 12

NC/SO - MOSI PIN 11

SCL-SCK - PIN 13

SDA - VSS - GND

VIN - 3.3v ARDUINO

IRQ - Vdd with 1k resitor.

TX - FTDI RX

GND - FTDI GND with Arduino

I am currently having trouble looking at the data in the output of the the breakout board…nothing is coming out. Here is my code:

#include <SPI.h>
const int  cs=10; //chip select 
unsigned char data;
// SC16IS750 Register definitions
// TODO: Don't bit shift these here, do it in the read/write register routines
//NOTE:In the spi mode, SDA / VSS pin is not connected to the power
#define THR        0x00 << 3
#define RHR        0x00 << 3
#define IER        0x01 << 3
#define FCR        0x02 << 3
#define IIR        0x02 << 3
#define LCR        0x03 << 3
#define MCR        0x04 << 3
#define LSR        0x05 << 3
#define MSR        0x06 << 3
#define SPR        0x07 << 3
#define TXLVL      0x08 << 3
#define RXLVL      0x09 << 3
#define DLAB       0x80 << 3
#define IODIR      0x0A << 3
#define IOSTATE    0x0B << 3
#define IOINTMSK   0x0C << 3
#define IOCTRL     0x0E << 3
#define EFCR       0x0F << 3

#define DLL        0x00 << 3
#define DLM        0x01 << 3
#define EFR        0x02 << 3
#define XON1       0x04 << 3  
#define XON2       0x05 << 3
#define XOFF1      0x06 << 3
#define XOFF2      0x07 << 3

void setup() {
  SPI.begin();
  Serial.begin(9600); 
  RTC_init();
  RTC_init();
  RTC_init();
  RTC_init();
  RTC_init();
  RTC_init();            //Initialized twice or more, otherwise the initialization is not successful

}

void loop() { 
  
  digitalWrite(cs, LOW);                     //read 
  SPI.transfer(RHR|0x80);
  data=SPI.transfer(0xff);               
  digitalWrite(cs, HIGH);
  //delay(1000);
  Serial.println(data);
  
  
  digitalWrite(cs, LOW);                     //write
  SPI.transfer(THR);
  SPI.transfer(data); 
  digitalWrite(cs, HIGH);
  delay(1000);
 
}
//=====================================
int RTC_init(){ 
	  pinMode(cs,OUTPUT); // chip select
	  // start the SPI library:
	  SPI.begin();
	  SPI.setBitOrder(MSBFIRST); 
	  SPI.setDataMode(SPI_MODE0); 
	  //set control register 
	  digitalWrite(cs, LOW);  
	  SPI.transfer(LCR);
	  SPI.transfer(0x80); 
	  digitalWrite(cs, HIGH);

	  digitalWrite(cs, LOW);  
	  SPI.transfer(DLL);
	  SPI.transfer(0x60); 
	  digitalWrite(cs, HIGH);

          digitalWrite(cs, LOW);  
	  SPI.transfer(DLM);
	  SPI.transfer(0x00); 
	  digitalWrite(cs, HIGH);

          digitalWrite(cs, LOW);  
	  SPI.transfer(LCR);
	  SPI.transfer(0xbf); 
	  digitalWrite(cs, HIGH);

          digitalWrite(cs, LOW);  
	  SPI.transfer(EFR);
	  SPI.transfer(0xd0); 
	  digitalWrite(cs, HIGH);

          digitalWrite(cs, LOW);  
	  SPI.transfer(LCR);
	  SPI.transfer(0x03); 
	  digitalWrite(cs, HIGH);

          digitalWrite(cs, LOW);  
	  SPI.transfer(FCR);
	  SPI.transfer(0x06); 
	  digitalWrite(cs, HIGH);

          digitalWrite(cs, LOW);  
	  SPI.transfer(FCR);
	  SPI.transfer(0x01); 
	  digitalWrite(cs, HIGH);
}