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SPI Code Help

Question asked by sd.pranathi on Oct 19, 2012
Hello All,

 I am using STM32Fs series and I am writing a code for SPI2 . I have to read and write from the slave device. I have to read the data when RX buffer is full and write data continuoulsy to another device. I have wrtitten a small application. Which could read and write. I am new to this domain. It would be of great help, if any could check and let me know if any changes needed

void

 

SPIInit(SPI_InitTypeDef *SPI_InitStruct)

 

{

 

 

//Initialize the SPI_Direction member

 

SPI_InitStruct->SPI_Direction = SPI_Direction_2Lines_FullDuplex;

 

//initialize the SPI_Mode member

 

SPI_InitStruct->SPI_Mode = SPI_Mode_Master;

 

//initialize the SPI_DataSize member

 

SPI_InitStruct->SPI_DataSize = SPI_DataSize_8b;

 

//Initialize the SPI_CPOL member

 

SPI_InitStruct->SPI_CPOL = SPI_CPOL_High;

 

//Initialize the SPI_CPHA member

 

SPI_InitStruct->SPI_CPHA = SPI_CPHA_2Edge;

 

//Initialize the SPI_NSS member

 

SPI_InitStruct->SPI_NSS = SPI_NSS_Soft;

 

//Initialize the SPI_BaudRatePrescaler member

 

SPI_InitStruct->SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;

 

//Initialize the SPI_FirstBit member */

 

SPI_InitStruct->SPI_FirstBit = SPI_FirstBit_MSB;

 

// Initialize the SPI_CRCPolynomial member

 

SPI_InitStruct->SPI_CRCPolynomial = 7;

 

// Configure SPI2

 

SPI_Init(SPI2, SPI_InitStruct);

 

// Enable SPI2 Receive and Transmit interrupts

 

SPI_I2S_ITConfig(SPI2, SPI_IT_TXE,

ENABLE);

 

SPI_I2S_ITConfig(SPI2, SPI_IT_RXNE,

ENABLE);

 

 

//Enable SPI2

 

SPI_Cmd(SPI2,

ENABLE);

 

}

 

uint8_t

 

SpiWrite(uint16_t Data)

 

{

 

uint8_t SlaveData;

 

 

while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET);

 

SPI_I2S_SendData(SPIx, Data);

 

while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET);

 

SlaveData=SPI_I2S_ReceiveData(SPIx);

 

return SUCCESS;

 

}

 

uint8_t

 

SpiRead(uint8_t *BufferPtr)

 

{

 

uint16_t RxBuffer=0;

 

 

while (SPI_I2S_GetITStatus(SPIx, SPI_I2S_IT_RXNE ));

 

RxBuffer=SPI_I2S_ReceiveData(SPIx);

 

return RxBuffer;

 

}

Thanks

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