MSP430FR5729: Problems with implementing MCP23S08 8 bit Port Expander on MSP430FR5729

Hello,

I'm using a MCP23S08 8-Bit I/O Expander with Serial Interface.

I want flash the LED with an SPI Microchip "MCP23S08".

 My C Code:

#include <msp430.h>

#define MCP_IODIR   0x00
#define MCP_IPOL    0x01
#define MCP_GPINTEN 0x02
#define MCP_DEFVAL  0x03
#define MCP_INTCON  0x04
#define MCP_IOCON   0x05
#define MCP_GPPU    0x06
#define MCP_INTF    0x07
#define MCP_INTCAP  0x08
#define MCP_GPIO    0x09
#define MCP_OLAT    0x0a
#define OPCODE      0x40 //0100A2A1 (01000000)

void SPI_init(void);              // initialize the SPI communication
void SPI_send(UChar data);        // send a SPI command
void Timing_init(void);

int main(void)
{
    WDTCTL = WDTPW + WDTHOLD;    // stop Watchdog timer

    Timing_init();              // set Timing

    SPI_init();                 // Initialize SPI-Module UCA1

    while(1)
    {
        P3OUT &= ~BIT2;    // CS set low
        __delay_cycles(200);
        while ((UCA1IFG & UCTXIFG) == 0);
        SPI_send(MCP_IODIR); // init IODIR
        P3OUT |= BIT2; // CS set high
        __delay_cycles(200);


        P3OUT &= ~BIT2;    // CS set low
        __delay_cycles(200);
        while ((UCA1IFG & UCTXIFG) == 0);
        SPI_send(OPCODE); // init OPCODE
        P3OUT |= BIT2; // CS set high
        __delay_cycles(200);


        P3OUT &= ~BIT2;    // CS set low
        __delay_cycles(200);
        while ((UCA1IFG & UCTXIFG) == 0);
        SPI_send(MCP_IODIR); // init MCP_IODIR
        P3OUT |= BIT2; // CS set high
        __delay_cycles(200);


        P3OUT &= ~BIT2;    // CS set low
        __delay_cycles(200);
        while ((UCA1IFG & UCTXIFG) == 0);
        SPI_send(0x00); // init 0x00 LED0
        P3OUT |= BIT2; // CS set high
        __delay_cycles(200);

    }
}

void SPI_init(void)
{
    P2SEL1 |= BIT4;               // Select secondary function of P2.4 (UCA1CLK)
    P2SEL1 |= BIT5;               // Select secondary function of P2.5 (UCA1SIMO)
    P2SEL1 |= BIT6;               // Select secondary function of P2.6 (UCA1SOMI)

    P3DIR |= BIT2;                // Declare P3.2 as Select Slave port
    P3OUT |= BIT2;                // Start with high on Select Slave P3.2

    UCA1CTLW0 |= UCCKPH;          // select clock phase to rising clock phase
    UCA1CTLW0 |= UCMSB;           // direction of shift register
    UCA1CTLW0 |= UCMST;           // SPI master
    UCA1CTLW0 |= UCSYNC;          // Synchronous mode enable
    UCA1CTLW0 |= UCSSEL_2;        // SMCLK clock selected
    UCA1CTLW0 |= UCSWRST;         // Software reset enable. Have to be selected here

    UCA1CTL1 ^= UCSWRST;          // Software reset disable. Set this way UCSWRST = 0
}

void SPI_send(UChar data)
{
//    P3OUT &= ~BIT2;                // Select Slave with setting P3.2 as low

    UCA1TXBUF = data;                // send data

//    P3OUT |= BIT2;                // End Select Slave with setting P3.2 as high
}

void Timing_init(void)
{
    // set up Clock System
    CSCTL0 = CSKEY;                                         // enable clock system
    CSCTL1 = DCOFSEL_3;                                     // frequency = 8,0 MHz
    CSCTL2 = SELA__XT1CLK | SELS__DCOCLK | SELM__DCOCLK;    // select clock sources
    CSCTL3 = DIVA__8 | DIVS__32 | DIVM__8;                  // set frequency divider
    CSCTL4 = XT2OFF | XTS | XT1DRIVE_0;                     // XT2 disabled, XT1: HF mode, low power, no bypass
    CSCTL0_H = 0;                                           // disable clock system
}

Could someone show me the spot I did wrong, or tell me what I might have forgotten.

I tried to study datasheet but it not confortable to get that chip working.