Aduc 814 SPI with python

import sys
sys.path.append("C:/Users/aguillem/AppData/Local/Continuum/anaconda3/Lib/site-packages")
from pyftdi.spi import SpiController


spi = SpiController(cs_count=1)
spi.configure('ftdi://ftdi:232h:FT337Y88/1')
slave = spi.get_port(cs=0, freq=1000000, mode=3) # 0 = half duplex // 3 = full duplex
write_buf = b'\x00\x03\x04'
read_buf = slave.exchange(write_buf, duplex=True).tobytes()
print("write buf ¦{}¦  \nread buf  ¦{}¦".format(write_buf, read_buf))

#include <ADUC814.H>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <GLOBAL.H>
#include <FUNCTION.H>

/* SPI port interrupt service routine */
void spi_int () interrupt 7{
	recieved_byte = SPIDAT; // clear by reading 
	
	sent_byte = recieved_byte + 1;
	SPIDAT = sent_byte;
}


unsigned char enable_interrupts()
{
	EA = 1;                       // Enable General interrupts
	IEIP2 = 0x11;                 // Enable SPI interrupt with high priority
	return 0;
}

unsigned char init()
{
	/* Select core clock */
	PLLCON  = 0x04;         //16.77216 MHz (0x01 = 8.388608 MHz   | 0x03 = 2.0971 MHz)
	
	/* Configure SPI */
	SPICON = 0x28; 					// CPHA=0, CPOL=1, Slave			
	CFG814 = 0x01; 					// Enable SPI interface
	
	return 0;
}

//-----------------------------------------------------------------------------
//MAIN C function
//-----------------------------------------------------------------------------
void main (void)
{
	unsigned char chan_2_convert;
	
	// Initialize
	init();
	enable_interrupts();
	
	while (1)
		{
			
		}
}