TMS320F28335: SPI provision to out contineous clock on SPICLK pin without sending data on SPIMOSI

Hi,

Thanks for your input.

How to enable peripheral clock?

Thanks & Regards,

Sachin

To enable the SPI CLK change the SPIAENCLK bit in the PCLKCR0 register (Peripheral clock control register). For example, 'SysCtrlRegs.PCLKCR0.bit.SPIAENCLK = 1;". This is an EALLOW protected write. 

If you look at the examples in C2000WARE this is typically found within the InitSysCtrl() function and then within the InitPeripheralClocks() function.

Best,

Marlyn

Hi,

Thanks for this input.

In my SPI application Slave inform to Master when there is data by GPIO. I have configured this GPIO as a external Interrupt.So when there is data external interrupt occures.I set notification flag and tried to send 0x00 on MOSI pin to give clock to SPI.

Please find below code 

a.Continuous for Loop

    for(;;)
    {

       // SpiaRegs.SPITXBUF = 0x00;
     // if(flag == 1)for(i=0;i<15;i++)SpiaRegs.SPITXBUF = 0;

       // while(Xint1Count<2)SpiaRegs.SPITXBUF = 0;
      //  while(notification==1)SpiaRegs.SPITXBUF = 0;

     if(notification==1)
     {
        for(i=0;i<15;i++)SpiaRegs.SPITXBUF = 0;
        display =1;
     }
    if(display ==1)
     {
         for(i=0;i<10;i++)scia_xmit(rdata[i]);
         display = 0;
         scia_xmit(Xint1Count);
     }
    }

b.External Interrupt

__interrupt void
xint1_isr(void)
{
    //GpioDataRegs.GPBCLEAR.all = 0x4;   // GPIO34 is low
    Xint1Count++;

    if(Xint1Count == 1)
    {
        notification=1;
    }
    else if (Xint1Count == 2)
        {
        notification=0;
        display = 1;
        }
    //
    // Acknowledge this interrupt to get more from group 1
    //
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

C.Capturing data in SPIFIFORX ISR,interrupt occurs when there is one character at SPI receive FIFO

__interrupt void
spiRxFifoIsr(void)
{

    rdata_point++;
    rdata[ldptr++] = SpiaRegs.SPIRXBUF;

}

With This code I am not able to get the data from slave as I thing there is delay in providing clock to Slave.

Please suggest any solution or code to provide clock to SPI slave to acquire data.

Thanks & Regards,

Sachin