Software SPI Write

void spiSoftWrite( uint8_t byte )
{
    uint8_t n = 0;

    for (n = 0 ; n < 8 ; n++)
    {
        PORT(SPI_SOFT_SCK_DDR) &= ~(1<<SPI_SOFT_SCK_BP);    // SCK = 0

        if (byte & 0x80)
        {
            PORT(SPI_SOFT_SDA_DDR) |=  (1<<SPI_SOFT_SDA_BP);    // SD = 1
        }
        else
        {
            PORT(SPI_SOFT_SDA_DDR) &= ~(1<<SPI_SOFT_SDA_BP);    // SD = 0
        }
        byte <<= 1;

        PORT(SPI_SOFT_SCK_DDR) |= (1<<SPI_SOFT_SCK_BP); // SCK = 1
    }
}