//MSP430G2553 SPI w5500 functions

//-Function---------------------------------------------------------------------
// SPI init for MSP430G2553
void spi_init(void) {
    BCSCTL1 = CALBC1_1MHZ;
    DCOCTL = CALDCO_1MHZ;

    P1SEL |= BIT5 + BIT6 + BIT7;
    P1SEL2 |= BIT5 + BIT6 + BIT7;

    UCB0CTL1 = UCSWRST;
    UCB0CTL0 = UCCKPH | UCMSB | UCMST | UCSYNC;
    UCB0CTL1 = UCSSEL_2 | UCSWRST;
    UCB0BR0 = 2;
    UCB0BR1 = 0;
    UCB0CTL1 &= ~UCSWRST;
}
//-END--------------------------------------------------------------------------


//-Function---------------------------------------------------------------------
//w5500 Chip Select
void w5500_CS(int w5500_transfer)
{
  if(w5500_transfer==1) P1OUT &= ~BIT1;
  else     P1OUT |= BIT1;    
}
//-END--------------------------------------------------------------------------


//-Function---------------------------------------------------------------------
//w5500_write
void w5500_write(uint16_t offset_addr, uint8_t control_phase){
       
    while(!(IFG2 & UCB0TXIFG));
    UCB0TXBUF = (offset_addr>>8)&0xFF;
    while(!(IFG2 & UCB0RXIFG));
    UCB0RXBUF;
    
    while(!(IFG2 & UCB0TXIFG));
    UCB0TXBUF = (offset_addr)&0xFF;
    while(!(IFG2 & UCB0RXIFG));
    UCB0RXBUF;
    
    //while(!(IFG2 & UCB0TXIFG));
    UCB0TXBUF = control_phase;
    while(!(IFG2 & UCB0RXIFG));
    UCB0RXBUF;
}
//-END--------------------------------------------------------------------------


//-Function---------------------------------------------------------------------
//w5500_read
void w5500_data_phase(uint8_t length, uint8_t WR_data, uint8_t *received_data,  ...){
  
  if(WR_data==0){
    for(int counter=0; counter<length; counter++){
      while(!(IFG2 & UCB0TXIFG));
      UCB0TXBUF = 0x00;
      UCB0RXBUF;
      while(!(IFG2 & UCB0RXIFG));
      received_data[counter] = UCB0RXBUF;
    }
  }
  
  if(WR_data==1){
    va_list args;
    va_start(args, length);
    
    for(int counter=0; counter<length; counter++){
      uint8_t temp_byte = (uint8_t)va_arg(args, int);

      while(!(IFG2 & UCB0TXIFG));
      UCB0RXBUF;
      UCB0TXBUF = temp_byte;
      while(!(IFG2 & UCB0RXIFG));
  }
}
}
//-END--------------------------------------------------------------------------


//-Function---------------------------------------------------------------------
int w5500_version_check(uint8_t read_version_value){
  int x = (read_version_value==0x04) ? 1:0;
  return x;
  }
//-END--------------------------------------------------------------------------