void spi1_init()
{
	SPI_InitTypeDef  SPI_InitStructure;
	GPIO_InitTypeDef GPIO_InitStructure;
	
	/* Configure CS */  
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);	

	deselect();//deselect mmc card
	
	/* Configure SPI1 pins: SCK and MOSI with default alternate function (not remapped) push-pull */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	/* Configure MISO as Input with internal pull-up */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	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_Low;
  	SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
  	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
  	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  	SPI_InitStructure.SPI_CRCPolynomial = 7;
  	SPI_Init(SPI1, &SPI_InitStructure);
	
	SPI_CalculateCRC(SPI1, DISABLE);
	SPI_Cmd(SPI1, ENABLE);
}

int spi1_tx(int tx)
{
	int tmp=0;
	SPI_I2S_SendData(SPI1,tx);
	while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)==RESET);
	tmp=SPI_I2S_ReceiveData(SPI1);
	return tmp;
}
int spi1_rx()
{
	int rx=0;
	while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)==RESET);
	SPI_I2S_SendData(SPI1,0xFF);
	while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)==RESET);
	rx=SPI_I2S_ReceiveData(SPI1);
	return rx;
}