void sFLASH_LowLevel_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/*!< sFLASH_SPI_CS_GPIO, sFLASH_SPI_MOSI_GPIO, sFLASH_SPI_MISO_GPIO
and sFLASH_SPI_SCK_GPIO Periph clock enable */
RCC_APB2PeriphClockCmd(sFLASH_CS_GPIO_CLK | sFLASH_SPI_MOSI_GPIO_CLK |
sFLASH_SPI_MISO_GPIO_CLK | sFLASH_SPI_SCK_GPIO_CLK, ENABLE);

/*!< sFLASH_SPI Periph clock enable */
if (sFLASH_SPI == SPI1)
RCC_APB2PeriphClockCmd(sFLASH_SPI_CLK, ENABLE);
else
RCC_APB1PeriphClockCmd(sFLASH_SPI_CLK, ENABLE);
/*!< Configure sFLASH_SPI pins: SCK */
GPIO_InitStructure.GPIO_Pin = sFLASH_SPI_SCK_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(sFLASH_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);

/*!< Configure sFLASH_SPI pins: MOSI */
GPIO_InitStructure.GPIO_Pin = sFLASH_SPI_MOSI_PIN;
GPIO_Init(sFLASH_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);

/*!< Configure sFLASH_SPI pins: MISO */
GPIO_InitStructure.GPIO_Pin = sFLASH_SPI_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(sFLASH_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);

/*!< Configure sFLASH_CS_PIN pin: sFLASH Card CS pin */
GPIO_InitStructure.GPIO_Pin = sFLASH_CS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(sFLASH_CS_GPIO_PORT, &GPIO_InitStructure);
}

unsigned char sFLASH_SendByte(unsigned char byte)
{
/*!< Loop while DR register in not emplty */
while (SPI_I2S_GetFlagStatus(sFLASH_SPI, SPI_I2S_FLAG_TXE) == RESET);

/*!< Send byte through the SPI1 peripheral */
SPI_I2S_SendData(sFLASH_SPI, byte);

/*!< Wait to receive a byte */
while (SPI_I2S_GetFlagStatus(sFLASH_SPI, SPI_I2S_FLAG_RXNE) == RESET);

/*!< Return the byte read from the SPI bus */
return SPI_I2S_ReceiveData(sFLASH_SPI);
}



void sFLASH_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;

sFLASH_LowLevel_Init();

/*!< Deselect the FLASH: Chip Select high */
sFLASH_CS_HIGH();

/*!< SPI configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
#if defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || defined (STM32F10X_HD_VL) || defined (STM32F10X_CL)
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
#else
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
#endif

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(sFLASH_SPI, &SPI_InitStructure);

/*!< Enable the sFLASH_SPI */
SPI_Cmd(sFLASH_SPI, ENABLE);
}