int main(void) {
	WDTCTL = WDTPW | WDTHOLD;	//watchdog_disable();
/* Inizializzo lo stack pointer al valore 0x5FF in fondo alla RAM */
	__asm (" MOV.W   #0x0600,SP");
	clear_RAM();
	delay_watchdog (wdt_delay);
	watchdog_enable();
	configurazione_iniziale();
	display_initialization();
	configurazione_SPI();
	trasmissione_CONFIGURAZIONI();
	FREE=0; //Is a counter linked with 100ms timer
	while (1) {
		 	watchdog();
		 	if(FREE>5) { //Wait 500ms
			Lettura_SPI();
			FREE=0;
		 	}
	}
}

void configurazione_SPI() {
    P3DIR |= BIT0|BIT1|BIT2|BIT3|BIT4;
    P3OUT |= BIT4;
    P3SEL = BIT0|BIT4|BIT5;
    P3REN |= BIT6;
    UCA0CTL1 |= UCSWRST;
    UCA0CTL0 |= (UCCKPH+UCMSB+UCMST+UCSYNC); // 3-pin, 8-bit SPI master
    UCA0CTL1 |= UCSSEL_2; // SMCLK
    UCA0BR0 |= 32; // /32
    UCA0BR1 = 0;
    UCA0MCTL = 0; // No modulation
    UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
}

void trasmissione_CONFIGURAZIONI() {
	unsigned int Configuration_Write;
    Configuration_Write = 0x80;
    P3OUT &= (~BIT3); // Select Device
    UCA0TXBUF=(Configuration_Write);	// Send 0x80 over SPI to MAX31865 to write on its internal Configuration_Register
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=CONREG_MAX50;		//Write in the Configuration_Register to set VBias, Conversion Mode and Filter's Frequency bits
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=0x00;
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=0x00;
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=0xFF;
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=0xFF;
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=0x00;
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=0x00;
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=0x00;
    while (!(IFG2 & UCA0TXIFG));
    loop_delayREAD();

    P3OUT |= (BIT3); // Unselect Device
}

//loop_delayREAD is an asm function for a little delay
loop_delayREAD:	mov.w	#0x20, R4
loop_delay:	dec R4
		jnz loop_delay
		ret

void Lettura_SPI() {
	unsigned char count;
	unsigned char var[8];
    Configuration_Read= 0x00;
    P3OUT &= (~BIT3);
    loop_delayREAD();
    UCA0TXBUF=0x00;
    while (!(IFG2 & UCA0TXIFG));
    UCA0TXBUF=0x00;
    while (!(IFG2 & UCA0TXIFG));
    for(count=0; count<8; count++) {
    	UCA0TXBUF=(0x00+count);
    	while (!(IFG2 & UCA0TXIFG));
    	var[count]=UCA0RXBUF;
    	}
    	loop_delayREAD();
    	P3OUT |= (BIT3);
    }

/*var[1] and var[2] should be my RTD_MSB and RTD_LSB respectively but what I read isn't correct*/