SC16IS750 SPI connection and receiving no output

hello,

i want send data via spi sc160is750 , data via uart.
this 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 1k resitor.

tx - ftdi rx
gnd - ftdi gnd arduino
hardware: http://www.sparkfun.com/products/9981

i having trouble looking @ data in output of the breakout board...nothing coming out. here code:

code: [select]

#include <spi.h>
const int  cs=10; //chip select
char data;
// sc16is750 register definitions
// todo: don't bit shift these here, in read/write register routines
//note:in spi mode, sda / vss pin not connected 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);
 
 spi_uart_init();
 spi_uart_init();
 spi_uart_init();
 
 if (spi_uart_init())
 {
serial.println("spi_uart initialized successfully!");
 }
 else
 {
serial.println("could not initialize!!!");
while(1);
 }
 /*spi_uart_init();
 spi_uart_init();
 spi_uart_init();
 spi_uart_init();
 spi_uart_init();            //initialized twice or more, otherwise initialization not successful
 */
}

void select(void)
{
 digitalwrite(cs,low);
}

void deselect(void)
{
 digitalwrite(cs,high);
}

char spi_transfer(volatile char data)
{
 spdr = data;                    // start transmission
 while (!(spsr & (1<<spif)))     // wait end of transmission
 {
 };
 return spdr;                    // return received byte
}

long int spi_write(char* srcptr, long int length)
// write string sc16is750
{
 for(long int = 0; < length; i++)
 {
   spi_transfer(srcptr[i]);
 }
 return length;
}

char spi_uart_readbyte(char address)
// read sc16is750 register @ <address>
{
 char data;

 address = (address | 0x80);

 select();
 spi_transfer(address);
 data = spi_transfer(0xff);
 deselect();
 return data;  
}

/*void spi_uart_writearray(char *data, long int numbytes)
// write array sc16is750 thr
{
 long int length;
 select();
 length = spi_write(&tx_fifo_address,1);

 while(numbytes > 16)
 {
   length = spi_write(data,16);
   numbytes -= 16;
   data += 16;
 }
 length = spi_write(data,numbytes);

 deselect();
}*/

void spi_uart_writebyte(char address, char data)
// write <data> sc16is750 register @ <address>
{
 long int length;
 char senddata[2];
 senddata[0] = address;
 senddata[1] = data;

 select();
 length = spi_write(senddata, 2);
 deselect();
}

void loop() {
 
 //read
 digitalwrite(cs, low);                      
 spi.transfer(rhr|0x80);
 data=spi.transfer(0xff);              
 digitalwrite(cs, high);
 //delay(1000);
 serial.println(data);
 
 //write
 digitalwrite(cs, low);                    
 spi.transfer(thr);
 spi.transfer(data);
 digitalwrite(cs, high);
 delay(1000);

}
//=====================================
int spi_uart_init(){
    pinmode(cs,output); // chip select
    // start 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);
   
    // perform read/write test check if uart working
   //write
   digitalwrite(cs, low);                    
   spi.transfer(thr);
   spi.transfer('h');
   digitalwrite(cs, high);
   delay(1000);
   
    //read
   digitalwrite(cs, low);                      
   spi.transfer(rhr|0x80);
   data=spi.transfer(0xff);              
   digitalwrite(cs, high);
   //delay(1000);
   serial.print("data received: ");
   serial.println(data);

   
   if(data == 'h'){
     return 1;
   }
   else {
     return 0;
   }
}


code: [select]

  spi_uart_init();
  spi_uart_init();
  spi_uart_init();
isn't once enough?
isn't once enough?
isn't once enough?

links hardware?

quote

i want send data via spi sc160is750 , data via uart.

why?

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > SC16IS750 SPI connection and receiving no output

arduino