25LC040P eeprom read/write sequence

I have recently started a project with using EEPROM chip (25LC040P) and MSP430F6638.

The thing is that I can't understand the read/write sequence for this chip. I have tried to write code using some examples and the official spec ( http://ww1.microchip.com/downloads/en/DeviceDoc/21204d.pdf ), but I don't know what's wrong with it:

// -----------------------------------------------
void spi_eeprom_select(void)
{
    P8OUT &= ~BIT_CS;
    __delay_cycles(100);
}

// -----------------------------------------------
void spi_eeprom_release(void)
{
    P8OUT |= BIT_CS;
    __delay_cycles(100);
}

// -----------------------------------------------
unsigned char spi_eeprom_exchg(unsigned char cDataOut)
{
    unsigned char cDataIn = 0;

    while (!(UCB1IFG & UCTXIFG));   // wait for USCI_B1 TX buffer ready
        UCB1TXBUF = cDataOut;         // transmit the first character

    while (!(UCB1IFG & UCRXIFG));    // wait for USCI_B1 RX buffer ready
        cDataIn = UCB1RXBUF;            // receive the first character

    return cDataIn;
}

// -----------------------------------------------
void spi_eeprom_WREN(void)
{
    spi_eeprom_select();
    spi_eeprom_exchg( CMD_WREN );
    spi_eeprom_release();
}

// -----------------------------------------------
void spi_eeprom_WRDI(void)
{
    spi_eeprom_select();
    spi_eeprom_exchg( CMD_WRDI );
    spi_eeprom_release();
}

// -----------------------------------------------
unsigned char spi_eeprom_RDSR(void)
{
    unsigned int iResult;

    spi_eeprom_select();
    spi_eeprom_exchg( CMD_RDSR );
    iResult = spi_eeprom_exchg( 0 );
    spi_eeprom_release();

    return iResult;
}

// -----------------------------------------------
void spi_eeprom_WRSR(unsigned char cStatus)
{
    spi_eeprom_select();
    spi_eeprom_exchg( CMD_WRSR );
    spi_eeprom_exchg( cStatus );
    spi_eeprom_release();
}

// -----------------------------------------------
unsigned char spi_eeprom_bwrite(unsigned int iAddr, unsigned char cDataOut)
{
    spi_eeprom_WREN();
    // perform write operation
    spi_eeprom_select();
    spi_eeprom_exchg( CMD_WRITE );
    spi_eeprom_exchg( iAddr & 0x00FF );
    spi_eeprom_exchg( cDataOut );
    spi_eeprom_release();

    return spi_eeprom_RDSR();
}

// -----------------------------------------------
unsigned char spi_eeprom_bread(unsigned int iAddr)
{
    unsigned int iResult;

    spi_eeprom_select();
    spi_eeprom_exchg( CMD_READ );
    spi_eeprom_exchg( iAddr & 0x00FF );
    iResult = spi_eeprom_exchg( 0 );
    spi_eeprom_release();

    return iResult;
}

// -----------------------------------------------

Could anyone review the command sequence for that chip?

And, by the way, somebody provide a working example how to work with 25LC040P on MSP430F6638 with SYS/BIOS?