SPI communication between two STM32F3 problem

[love-peace2001]

Posted on November 21, 2013 at 12:42The original post was too long to process during our migration. Please click on the attachment to read the original post.

[Tesla DeLorean]

Posted on November 21, 2013 at 15:43

The master might want to make sure RXNE is cleared prior to sending the junk bytes

[love-peace2001]

Posted on November 21, 2013 at 17:10

Thank you clive for your response. I'm not sure understanding your remark.

Do you mean , i have to change the order like this?  while (RxIdx <BufferSize)     {                    /* In this step, the Master recieves data from the Slave*/          /* Wait for SPI1 data reception */        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);        /* Read SPI1 received data */        SPI1_Buffer_Rx[RxIdx] = SPI_ReceiveData8(SPI1);            RxIdx++;              /* send a byte */          while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);        //SPI_SendData8(SPI1,SPI1_Buffer_Tx[TxIdx++]);                     // Send Dummy SPI data to get back data from DR Register              SPI_SendData8(SPI1,0x01);      }   If yes, it doesn't work, it gets stuck in RXNE.

[Tesla DeLorean]

Posted on November 21, 2013 at 17:52

while(RxIdx <BufferSize)
{
/* send a byte */
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET); // Spin Till TX Empty, should be after RX
if (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) != RESET) // Clear any hanging RX
SPI_ReceiveData8(SPI1);
// Send Dummy SPI data to get back data from DR Register 
SPI_SendData8(SPI1,0x01); 
/* In this step, the Master recieves data from the Slave*/
/* Wait for SPI1 data reception */
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
/* Read SPI1 received data */
SPI1_Buffer_Rx[RxIdx] = SPI_ReceiveData8(SPI1);
RxIdx++;
/* Turn on LED5 */
STM_EVAL_LEDOn(LED5); 
}

[love-peace2001]

Posted on November 21, 2013 at 18:34

I tried you solution but unfortunately, i have only zero.

May be i need to make some delay to wait the slave clock to start transfer because i think that during two cycles, the clock still inactive this why i have 2 zero in the beginning. I don't how and where ?