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Hi Gautam and thank you,

What about the number 8, what that mean?

thank you

Hamdi, "..8" feels like a wrong syntax. Where did you extract this line from? Let me know, I'll check and come back to you then.

Regards,

Gautam

Actually, I`m a master student and I have class "microcontroller". The professor teaches us DSP c2000, TMS320F2812 and he starts to execute some labs as shown in attached file

page numbers 15-30

This is the whole program

void InitSystem(void);
void delay_loop(long);
void InitGpio(void);



void main(void)
{
    unsigned int i, Din;
    unsigned long var, K=100000;
    unsigned int LED[8]= {0x0001,0x0002,0x0004,0x0008,
                          0x0010,0x0020,0x0040,0x0080};
    
    InitSystem();
    InitGpio();        // Initialize the GPIO's

    while(1)
    {    
        //add the instructions here for Lab3
    for (i=0;i<14;i++)
        {
            if(i<7)
            {
                GpioDataRegs.GPBDAT.all = LED[i];
            }
            else
            {
            GpioDataRegs.GPBDAT.all = LED[14-i];
            }
            Din = GpioDataRegs.GPBDAT.all>>8;
            var = K*(1+Din);
            delay_loop(var);
        }
    }
}     

void delay_loop(long end)
{
    //Delay time is approximately equal to 70 ns *(end+1) when the CPU clock is 150 MHz
    long i;
    for (i = 0; i < end; i++)  
    {
    /*
        EALLOW;
        SysCtrlRegs.WDKEY = 0x55;
        SysCtrlRegs.WDKEY = 0xAA;
        EDIS;   
    */
    }
}



void InitGpio(void)
{
    EALLOW;
    GpioMuxRegs.GPAMUX.all = 0x0000;    // all GPIO port Pin's to I/O
    GpioMuxRegs.GPBMUX.all = 0x0000;   
    GpioMuxRegs.GPDMUX.all = 0x0000;
    GpioMuxRegs.GPFMUX.all = 0x0000;        
    GpioMuxRegs.GPEMUX.all = 0x0000;
    GpioMuxRegs.GPGMUX.all = 0x0000;            
                                        
    GpioMuxRegs.GPADIR.all = 0x0000;    // GPIO PORT  as input
    GpioMuxRegs.GPBDIR.all = 0x00FF;    // GPIO Port B15-B8 input , B7-B0 output
    GpioMuxRegs.GPDDIR.all = 0x0000;    // GPIO PORT  as input
    GpioMuxRegs.GPEDIR.all = 0x0000;    // GPIO PORT  as input
    GpioMuxRegs.GPFDIR.all = 0x0000;    // GPIO PORT  as input
    GpioMuxRegs.GPGDIR.all = 0x0000;    // GPIO PORT  as input

    GpioMuxRegs.GPAQUAL.all = 0x0;    // Set GPIO input qualifier values to zero
    GpioMuxRegs.GPBQUAL.all = 0x0;
    GpioMuxRegs.GPDQUAL.all = 0x0;
    GpioMuxRegs.GPEQUAL.all = 0x0;
    EDIS;
}     

void InitSystem(void)
{
       EALLOW;
       SysCtrlRegs.WDCR= 0x00E8;        // Setup the watchdog
                                       // 0x00E8  to disable the Watchdog , Prescaler = 1
                                       // 0x00AF  to NOT disable the Watchdog, Prescaler = 64
/*
       SysCtrlRegs.SCSR = ?;             // Watchdog generates a RESET    
       SysCtrlRegs.PLLCR.bit.DIV = ?;    // Setup the Clock PLL to multiply by 5
    
       SysCtrlRegs.HISPCP.all = 0x?;     // Setup Highspeed Clock Prescaler to divide by 2
       SysCtrlRegs.LOSPCP.all = 0x?;     // Setup Lowspeed CLock Prescaler to divide by 4
          
       // Peripheral clock enables set for the selected peripherals.   
       SysCtrlRegs.PCLKCR.bit.EVAENCLK=0;
       SysCtrlRegs.PCLKCR.bit.EVBENCLK=0;
       SysCtrlRegs.PCLKCR.bit.SCIAENCLK=0;
       SysCtrlRegs.PCLKCR.bit.SCIBENCLK=0;
       SysCtrlRegs.PCLKCR.bit.MCBSPENCLK=0;
       SysCtrlRegs.PCLKCR.bit.SPIENCLK=0;
       SysCtrlRegs.PCLKCR.bit.ECANENCLK=0;
       SysCtrlRegs.PCLKCR.bit.ADCENCLK=0;

3107.Module3.pdf

     Din = GpioDataRegs.GPBDAT.all>>8;

Its >> and not ".."

That's what I was wondering. GPBDAT.all is a 32-bit-value. Hence, if you shift right 8 times, you will get the respective GPIO from group B on the LSB. Basically you're trying to select the particular GPIOs.

Here's an example for left shifting:

Uint32 somedata;

GpioDataRegs.GPADAT.all = somedata & 0x000000FF; //write to GPIO7-GPIO0   

GpioDataRegs.GPADAT.all = (somedata << 8) & 0x0000FF00; //write to GPIO15-GPIO8   

GpioDataRegs.GPADAT.all = (somedata << 16) & 0x00FF0000; //write to GPIO23-GPIO16

GpioDataRegs.GPADAT.all = (somedata << 24) & 0xFF000000; //write to GPIO31-GPIO24   

Regards,

Gautam