Reading and writing to SPI ?

Posted on September 30, 2015 at 08:14

Guys,

Can I replace this function

SPIPutChar(uint8_t data[])

{

/* Write and Read a byte on SPI interface. */

unsigned char inb;

/* Wait if TXE cleared, Tx FIFO is full. */

while ((SPI1->SR & TXE) == 0);

SPI1->DR = outb;

/* Wait if RNE cleared, Rx FIFO is empty. */

while ((SPI1->SR & RXNE) == 0);

inb = SPI1->DR;

return (inb); HAL_SPI_Transmit_DMA(&hspi1,data,1);

and

char SPIGetChar(void)

{

char Data = 0;

/* Wait until the transmit buffer is empty */

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

/* Send the byte */

SPI_I2S_SendData(SPI1, 0xFF);

/* Wait until a data is received */

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

/* Get the received data */

/Data = SPI_I2S_ReceiveData(SPI1);

/* Return the shifted data */

return Data;

} to :

HAL_SPI_Receive_DMA(&hspi1, data, 1)

Please correct me if I'm wrong with this function, I tried to replace with HAL function

unsigned char Mp3ReadRegister( unsigned char addressbyte)

{

int resultvalue = 0;

Mp3DeselectData();

Mp3SelectControl(); //XCS = 0

uint8_t data7[2] = { VS_READ_COMMAND, addressbyte };

HAL_SPI_Transmit_DMA(&hspi1,data7,2);

//SPIPutChar(VS_READ_COMMAND); //????????

//SPIPutChar(addressbyte); //????????

uint8_t data8[1] = {0x00};

resultvalue = HAL_SPI_Receive_DMA(&hspi1, data8, 1) << 8;

resultvalue |= HAL_SPI_Receive_DMA(&hspi1, data8, 1);

//resultvalue = SPIGetChar() << 8;//???8???

//resultvalue |= SPIGetChar(); //???8???

Mp3DeselectControl();

return resultvalue; //??16??????

}

Thank you