CC430 SPI Communication

Hello,

I'm using a EM-CC430F6137-900 Board and I'm trying to get the SPI communication to work. I had a look at the example files for MSP430. This program works well.

May question now is: Is it possible to send and read data without the interrupt routine? 

For example:

#include <msp430.h> 

void initSPI()
{

        PMAPPWD = 0x02D52;                       // Get write-access to port mapping regs
        P2MAP2 = PM_UCB0SIMO;                    // Map UCA0SIMO output to P2.2
        P2MAP3 = PM_UCB0SOMI;                    // Map UCA0SOMI output to P2.3
        P2MAP4 = PM_UCB0CLK;                     // Map UCA0CLK output to P2.4
        PMAPPWD = 0;                             // Lock port mapping registers

	P2DIR |= BIT5 + BIT6;                    // Set chip selects for two spi components
	P2DIR |= BIT2 + BIT3 + BIT4;             // set output direction for clk and mosi
	P2SEL |= BIT2 + BIT3 + BIT4;             // switch to secondary function - spi in this case

	UCB0CTL1 |= UCSWRST;                     // **Put state machine in reset**
        UCB0CTL0 |= UCMST+UCSYNC+UCMSB+UCCKPH;   // 3-pin, 8-bit SPI master
	                                         // mode(0,0??), MSB
	UCB0CTL1 |= UCSSEL_2;                    // SMCLK
	UCB0BR0 = 0x02;                          // /2
	UCB0BR1 = 0;                             //
	UCB0CTL1 &= ~UCSWRST;                    // **Initialize USCI state machine**
	UCB0IE |= UCRXIE;                        // Enable USCI_B0 RX interrupt

	// Re-enable all interrupts
	__enable_interrupt();


}

char sendByteSPI (char send_data)
{
	while (!(UCB0IFG & UCTXIFG));             // USCI_B0 TX buffer ready?
	UCB0TXBUF = send_data;                    // Transmit first character

	while (!(UCB0IFG & UCRXIFG));             // USCI_B0 RX received complete character?
   return UCB0RXBUF;
}


int main(void) 
{
    WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer
    __disable_interrupt();
    
    initSPI();

    sendByteSPI(0x03);

}

For me it isn't clear, why this doesn't work. Is this the wrong way I think it works?

I hope you can help me.

Thanks, Chris