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Forum: µC & Digital Electronics Strange SPI-Interrupt behaviour with STM32F107


von Marco (Guest)


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Hi,

I am working on a spi-driver implementation for STM32F107. Things seem 
to work quite well, but I get sporadic interrupts on SPI with only the 
BSY-flag set. No other flags like TXE,RXNE, etc. are set.

Here is my interrupt handler for spi(it is called by SPI3_IRQHandler 
where I disable all interrupts temporaryly) When the sporadic interrupt 
occurs, spiLastEvent contains 0x80.
1
void generalSpiInterruptHandler(SPI_TypeDef* pSpix, Int32 spiNum) 
2
{
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  UInt16 spiLastEvent = pSpix->SR & 0x83;
4
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 if (spiLastEvent & SPI_I2S_FLAG_RXNE)
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  {
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    if ((NULL) != spiCallbacks[spiNum].rxCallback)
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    {
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      spiCallbacks[spiNum].rxCallback(spiNum);
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    } 
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  }
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  else
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  {
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    if(spiLastEvent & SPI_I2S_FLAG_TXE)
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    {
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      if ((NULL) != spiCallbacks[spiNum].txCallback)
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      {
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        spiCallbacks[spiNum].txCallback(spiNum);
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      }    
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    }
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    else
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    {
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      /* an error occoured */ 
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      if (spiLastEvent & SPI_I2S_FLAG_OVR)
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      {
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        /* overrun error */
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        if ((NULL) != spiCallbacks[spiNum].errorCallback)
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        {
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          spiCallbacks[spiNum].errorCallback(spiNum);
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        }
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      }
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      else
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      {
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        if(spiLastEvent & SPI_FLAG_MODF)
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        {
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          /* Mode Fault */
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          if ((NULL) != spiCallbacks[spiNum].errorCallback)
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          {
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            spiCallbacks[spiNum].errorCallback(spiNum);
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          }
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        }
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        else
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        {
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          if(spiLastEvent & SPI_FLAG_CRCERR)
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          {
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            /* CRC error */
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            if ((NULL) != spiCallbacks[spiNum].errorCallback)
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            {
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              spiCallbacks[spiNum].errorCallback(spiNum);
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            }   
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          }
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          else
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          {
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            /* undefined error */
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            if ((NULL) != spiCallbacks[spiNum].errorCallback)
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            {
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             spiCallbacks[spiNum].errorCallback(spiNum);
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            }        
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          }
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        }
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      }
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    }
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  }  
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}

Anybody seen this behavious with sporadic BSY-interrupts as well?

Thanks a lot in advance!

--
Marco

von Angela (Guest)


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Hi Marco,

I hope u have solved the problem that u had.
Could u please provide me with the source code of the spi-driver for 
STM32F107.

Thxxx a lot.

Cheers,
Angela

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