Posted on February 14, 2015 at 14:57Hi, the code for my interrupt handler is below
void SPI_IRQHandler(SPI_TypeDef * SPIx)
{
uint8_t SPIn = (SPIx == SPI1) ? 0 : ((SPIx == SPI2) ? 1 : 2);
if(SPI_I2S_GetITStatus(SPIx, SPI_I2S_IT_RXNE) == SET)
{
if(_RxCounter[SPIn] < _RxNumData[SPIn])
{
if(_RxBuffer[(SPIx == SPI1) ? 0 : ((SPIx == SPI2) ? 1 : 2)])
{
_RxCounter[SPIn]++;
_RxBuffer[SPIn][_RxCounter[SPIn] - 1] = SPI_I2S_ReceiveData(SPIx);
SPI_RX_UserCallback(SPIx, _RxBuffer[SPIn], &_RxNumData[SPIn]);
}
else
SPI_I2S_ReceiveData(SPIx);
}
else if(_RxCounter[SPIn] == _RxNumData[SPIn])
{
if(_RxBuffer[(SPIx == SPI1) ? 0 : ((SPIx == SPI2) ? 1 : 2)])
{
SPI_I2S_ITConfig(SPIx, SPI_I2S_IT_TXE, DISABLE);
SPI_I2S_ITConfig(SPIx, SPI_I2S_IT_RXNE, DISABLE);
while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_BSY) == SET);
spi_ready(SPIx);
SPI_RXTC_UserCallback(SPIx, _RxBuffer[SPIn], &_RxNumData[SPIn]);
}
}
}
if(SPI_I2S_GetITStatus(SPIx, SPI_I2S_IT_TXE) == SET)
{
if(_TxCounter[SPIn] < _TxNumData[SPIn])
{
if(_TxBuffer[(SPIx == SPI1) ? 0 : ((SPIx == SPI2) ? 1 : 2)])
{
_TxCounter[SPIn]++;
SPI_I2S_SendData(SPIx, _TxBuffer[SPIn][_TxCounter[SPIn] - 1]);
SPI_TX_UserCallback(SPIx, _TxBuffer[SPIn], &_TxNumData[SPIn]);
}
else
SPI_I2S_SendData(SPIx, (SPIx == SPI1) ? DUMMY1 : ((SPIx == SPI2) ? DUMMY2 : DUMMY3));
}
else if(_TxCounter[SPIn] == _TxNumData[SPIn])
{
if(_TxBuffer[SPIn])
{
SPI_I2S_ITConfig(SPIx, SPI_I2S_IT_TXE, DISABLE);
while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_BSY) == SET);
spi_ready(SPIx);
SPI_TXTC_UserCallback(SPIx, _TxBuffer[SPIn], &_TxNumData[SPIn]);
}
}
}
}
I am getting 2 extra bytes of clock pulse while receiving data from the flash memory (SPI communication). Why am I getting this problem and How to rectify it ? Any kind of help would be appreciated. Thank You.
#stm32f4 #discovery #spi #flash
