Beispiel #1
0
/*!
    \brief closes an opened spi communication port

	\param	 		fd			-	file descriptor of an opened SPI channel

	\return			upon successful completion, the function shall return 0.
					Otherwise, -1 shall be returned

    \sa             spi_Open
	\note
    \warning
*/
int spi_Close(Fd_t fd)
{
    unsigned long ulBase = LSPI_BASE;

    g_SpiFd = 0;
if(g_ucDMAEnabled)
{
    //Simplelink_UDMADeInit();
    #ifdef SL_PLATFORM_MULTI_THREADED
      osi_InterruptDeRegister(INT_LSPI);
      osi_MsgQDelete(&DMAMsgQ);
    #else
      SPIIntUnregister(ulBase);
      g_cDummy = 0;
    #endif
    SPIFIFODisable(ulBase,SPI_RX_FIFO);
    SPIFIFODisable(ulBase,SPI_TX_FIFO);
    SPIDmaDisable(ulBase,SPI_RX_DMA);
    SPIDmaDisable(ulBase,SPI_TX_DMA);
}
    //Disable Chip Select
    SPICSDisable(LSPI_BASE);


    //Disable SPI Channel
    SPIDisable(ulBase);

    // Reset SPI
    SPIReset(ulBase);

    // Enable SPI Peripheral
    PRCMPeripheralClkDisable(PRCM_LSPI,PRCM_RUN_MODE_CLK|PRCM_SLP_MODE_CLK);

    return 0;
}
Beispiel #2
0
//*****************************************************************************
//
//! DMA SPI interrupt handler
//!
//! \param None
//!
//! This function
//!        1. Invoked when SPI Transaction Completes
//!
//! \return None.
//
//*****************************************************************************
void DmaSpiSwIntHandler()
{
    SPIIntClear(LSPI_BASE,SPI_INT_EOW);
    SPICSDisable(LSPI_BASE);
#if defined(SL_PLATFORM_MULTI_THREADED)
    osi_MsgQWrite(&DMAMsgQ,g_cDummy,OSI_NO_WAIT);
#else
    g_cDummy = 0x1;
#endif
}
// Distinguishing write data, DC (GPIOA2_BASE) set to high
void writeData(unsigned char c) {
  unsigned long ulDummy;

  GPIOPinWrite(GPIOA2_BASE, 0x40, 0x40);
  SPICSEnable(GSPI_BASE);

  SPIDataPut(GSPI_BASE, c);
  SPIDataGet(GSPI_BASE, &ulDummy);

  SPICSDisable(GSPI_BASE);
}
Beispiel #4
0
/*!
    \brief attempts to write up to len bytes to the SPI channel

	\param			pBuff		- 	points to first location to start getting the data from

	\param			len			-	number of bytes to write to the SPI channel

	\return			upon successful completion, the function shall return write size.
					Otherwise, -1 shall be returned

    \sa             spi_Read_CPU , spi_Write_CPU
	\note			This function could be implemented as zero copy and return only upon successful completion
					of writing the whole buffer, but in cases that memory allocation is not too tight, the
					function could copy the data to internal buffer, return back and complete the write in
					parallel to other activities as long as the other SPI activities would be blocked untill
					the entire buffer write would be completed
    \warning
*/
int spi_Write_CPU(unsigned char *pBuff, int len)
{


    unsigned long ulCnt;
    unsigned long ulStatusReg;
    unsigned long *ulDataOut;
    unsigned long ulDataIn;
    unsigned long ulTxReg;
    unsigned long ulRxReg;

    //Enable Chip Select
    //HWREG(0x44022128)&=~1;
    SPICSEnable(LSPI_BASE);

    //
    // Initialize local variable.
    //
    ulDataOut = (unsigned long *)pBuff;
    ulCnt = (len +3 ) >> 2;
    ulStatusReg = LSPI_BASE+MCSPI_O_CH0STAT;
    ulTxReg = LSPI_BASE + MCSPI_O_TX0;
    ulRxReg = LSPI_BASE + MCSPI_O_RX0;

    //
    // Writing Loop
    //
    while(ulCnt--)
    {
          while(!( HWREG(ulStatusReg)& MCSPI_CH0STAT_TXS ));
          HWREG(ulTxReg) = *ulDataOut;
          while(!( HWREG(ulStatusReg)& MCSPI_CH0STAT_RXS ));
          ulDataIn = HWREG(ulRxReg);
          ulDataOut++;
    }

    //Disable  Chip Select
    //HWREG(0x44022128)|= 1;

    SPICSDisable(LSPI_BASE);

    UNUSED(ulDataIn);
    return len;

}
Beispiel #5
0
/*!
    \brief open spi communication port to be used for communicating with a SimpleLink device

	Given an interface name and option flags, this function opens the spi communication port
	and creates a file descriptor. This file descriptor can be used afterwards to read and
	write data from and to this specific spi channel.
	The SPI speed, clock polarity, clock phase, chip select and all other attributes are all
	set to hardcoded values in this function.

	\param	 		ifName		-	points to the interface name/path. The interface name is an
									optional attributes that the simple link driver receives
									on opening the device. in systems that the spi channel is
									not implemented as part of the os device drivers, this
									parameter could be NULL.
	\param			flags		-	option flags

	\return			upon successful completion, the function shall open the spi channel and return
					a non-negative integer representing the file descriptor.
					Otherwise, -1 shall be returned

    \sa             spi_Close , spi_Read , spi_Write
	\note
    \warning
*/
Fd_t spi_Open(char *ifName, unsigned long flags)
{
    unsigned long ulBase;

    //NWP master interface
    ulBase = LSPI_BASE;

    //Enable MCSPIA2
    PRCMPeripheralClkEnable(PRCM_LSPI,PRCM_RUN_MODE_CLK|PRCM_SLP_MODE_CLK);

    //Disable Chip Select
    SPICSDisable(ulBase);

    //Disable SPI Channel
    SPIDisable(ulBase);

    // Reset SPI
    SPIReset(ulBase);

    //
  // Configure SPI interface
  //
  SPIConfigSetExpClk(ulBase,PRCMPeripheralClockGet(PRCM_LSPI),
                     SPI_IF_BIT_RATE,SPI_MODE_MASTER,SPI_SUB_MODE_0,
                     (SPI_SW_CTRL_CS |
                     SPI_4PIN_MODE |
                     SPI_TURBO_OFF |
                     SPI_CS_ACTIVEHIGH |
                     SPI_WL_32));

if(PRCMPeripheralStatusGet(PRCM_UDMA))
{
  g_ucDMAEnabled = (HWREG(UDMA_BASE + UDMA_O_CTLBASE) != 0x0) ? 1 : 0;
}
else
{
	g_ucDMAEnabled = 0;
}
#ifdef SL_CPU_MODE
g_ucDMAEnabled = 0;
#endif
if(g_ucDMAEnabled)
{
    memset(g_ucDinDout,0xFF,sizeof(g_ucDinDout));
    //g_ucDout[0]=0xFF;
    //Simplelink_UDMAInit();
    // Set DMA channel
    cc_UDMAChannelSelect(UDMA_CH12_LSPI_RX);
    cc_UDMAChannelSelect(UDMA_CH13_LSPI_TX);


    SPIFIFOEnable(ulBase,SPI_RX_FIFO);
    SPIFIFOEnable(ulBase,SPI_TX_FIFO);
    SPIDmaEnable(ulBase,SPI_RX_DMA);
    SPIDmaEnable(ulBase,SPI_TX_DMA);

    SPIFIFOLevelSet(ulBase,1,1);
#if defined(SL_PLATFORM_MULTI_THREADED)
    osi_InterruptRegister(INT_LSPI, (P_OSI_INTR_ENTRY)DmaSpiSwIntHandler,INT_PRIORITY_LVL_1);
    SPIIntEnable(ulBase,SPI_INT_EOW);


    osi_MsgQCreate(&DMAMsgQ,"DMAQueue",sizeof(int),1);
#else

    IntRegister(INT_LSPI,(void(*)(void))DmaSpiSwIntHandler);
    IntPrioritySet(INT_LSPI, INT_PRIORITY_LVL_1);
    IntEnable(INT_LSPI);

    SPIIntEnable(ulBase,SPI_INT_EOW);


    g_cDummy = 0x0;
#endif

}
    SPIEnable(ulBase);

    g_SpiFd = 1;
    return g_SpiFd;

}