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CCS/TMS320F28069M: ISSUE WORKING WITH usb_host_msc.c EXAMPLE CODE.

NAYAN KHULBE
Prodigy 100 points

Part Number: TMS320F28069M

Tool/software: Code Composer Studio

Dear all,

I am trying to interface usb with c2000 microcontroller but the example code usb_host_msc.c   is stopping at while loop in  SysCtrlInit() function.

The function is as follows:

void SysCtrlInit(void)
{

EALLOW;
//Disable Watchdog
SysCtrlRegs.WDCR = 0x68;

//Setup Clock
//20MHz ->PLL->80MHz->C28
// ->PLL2->120MHz->USB
SysCtrlRegs.CLKCTL.bit.XCLKINOFF = 1;
SysCtrlRegs.CLKCTL.bit.XTALOSCOFF = 0;
SysCtrlRegs.CLKCTL.bit.OSCCLKSRC2SEL = 0;
SysCtrlRegs.CLKCTL.bit.OSCCLKSRCSEL = 1;

while(SysCtrlRegs.PLLSTS.bit.MCLKSTS);///////////////////////////////////// it is stopping here.
SysCtrlRegs.PLLSTS.bit.DIVSEL = 0;// /4
SysCtrlRegs.PLLSTS.bit.MCLKOFF = 1;
SysCtrlRegs.PLLCR.bit.DIV = 0xA;

while(!SysCtrlRegs.PLLSTS.bit.PLLLOCKS);
SysCtrlRegs.PLLSTS.bit.MCLKOFF = 1;
SysCtrlRegs.PLLSTS.bit.DIVSEL = 2;

SysCtrlRegs.PLL2CTL.bit.PLL2CLKSRCSEL = 2;
 SysCtrlRegs.PLL2CTL.bit.PLL2EN = 1;
 SysCtrlRegs.PLL2MULT.bit.PLL2MULT = 6;
 while(!SysCtrlRegs.PLL2STS.bit.PLL2LOCKS);

//Enable USB Clock
SysCtrlRegs.PCLKCR3.bit.USB0ENCLK = 1;
//Enable PHY
GpioCtrlRegs.GPACTRL2.bit.USB0IOEN = 1;

EDIS;
}

Anyone please help,

Regards,

Nayan Khulbe.

  • 0
    TI__Guru 54365 points
    It's detecting a missing clock. You can try clearing it by using the PLLSTS.MCLKCLR bit, retrying selecting your clock source, and checking the MCLKSTS bit again to see if the clock is still missing.

    What board are you using? A TI board (LaunchPad? controlCARD?) or a custom board?

    Whitney
  • 0 in reply to Whitney Dewey
    Prodigy 100 points
    Hi,

    Thanks for replying, I am using c2000 piccolo launchpad.

    Regards,
    Nayan
  • 0 in reply to NAYAN KHULBE
    TI__Guru 54365 points
    Thanks for the additional info. Did you try my suggestion?

    Whitney
  • 0 in reply to Whitney Dewey
    Prodigy 100 points
    HI,

    Do we need external oscillator for USB operation. Because if i make

    SysCtrlRegs.CLKCTL.bit.XCLKINOFF = 0;
    SysCtrlRegs.CLKCTL.bit.XTALOSCOFF = 0;
    SysCtrlRegs.CLKCTL.bit.OSCCLKSRC2SEL = 0;
    SysCtrlRegs.CLKCTL.bit.OSCCLKSRCSEL = 0;

    instead of:

    SysCtrlRegs.CLKCTL.bit.XCLKINOFF = 1;
    SysCtrlRegs.CLKCTL.bit.XTALOSCOFF = 0;
    SysCtrlRegs.CLKCTL.bit.OSCCLKSRC2SEL = 0;
    SysCtrlRegs.CLKCTL.bit.OSCCLKSRCSEL = 1;

    it is passing the while loop.



    Regards,

    nayan
  • 0 in reply to NAYAN KHULBE
    Prodigy 100 points
    Hi,

    You want me to do something like this:

    void SysCtrlInit(void)
    {

    EALLOW;
    //Disable Watchdog
    SysCtrlRegs.WDCR = 0x68;

    //Setup Clock
    //20MHz ->PLL->80MHz->C28
    // ->PLL2->120MHz->USB
    SysCtrlRegs.CLKCTL.bit.XCLKINOFF = 1;
    SysCtrlRegs.CLKCTL.bit.XTALOSCOFF = 0;
    SysCtrlRegs.CLKCTL.bit.OSCCLKSRC2SEL = 0;
    SysCtrlRegs.CLKCTL.bit.OSCCLKSRCSEL = 1;

    while(SysCtrlRegs.PLLSTS.bit.MCLKSTS){
    SysCtrlRegs.PLLSTS.bit.MCLKCLR = 1;///////////////////////////// as you have told
    SysCtrlRegs.CLKCTL.bit.XCLKINOFF = 1;
    SysCtrlRegs.CLKCTL.bit.XTALOSCOFF = 0;
    SysCtrlRegs.CLKCTL.bit.OSCCLKSRC2SEL = 0;
    SysCtrlRegs.CLKCTL.bit.OSCCLKSRCSEL = 1;
    }

    // SysCtrlRegs.PLLSTS.bit.MCLKOFF = 1;
    SysCtrlRegs.PLLSTS.bit.DIVSEL = 0;// /4
    SysCtrlRegs.PLLSTS.bit.MCLKOFF = 1;
    SysCtrlRegs.PLLCR.bit.DIV = 4;

    while(!SysCtrlRegs.PLLSTS.bit.PLLLOCKS);
    SysCtrlRegs.PLLSTS.bit.MCLKOFF = 1;
    SysCtrlRegs.PLLSTS.bit.DIVSEL = 3;

    SysCtrlRegs.PLL2CTL.bit.PLL2CLKSRCSEL = 0;
    SysCtrlRegs.PLL2CTL.bit.PLL2EN = 1;
    SysCtrlRegs.PLL2MULT.bit.PLL2MULT = 6;
    while(!SysCtrlRegs.PLL2STS.bit.PLL2LOCKS);

    //Enable USB Clock
    SysCtrlRegs.PCLKCR3.bit.USB0ENCLK = 1;
    //Enable PHY
    GpioCtrlRegs.GPACTRL2.bit.USB0IOEN = 1;

    EDIS;
    }

    Regards,
    nayan
  • 0 in reply to NAYAN KHULBE
    Prodigy 100 points
    hi,

    I am sorry my launchpad does not have a external oscillator that is why the program is not coming out of while loop.

    I have one more question:
    Do we really need an external oscillator for the usb. Does internal oscillator wont work.

    Regards,
    Nayan.
  • 0 in reply to NAYAN KHULBE
    TI__Guru 54365 points
    Yes, according to the datasheet, INTOSC1 (the only internal source that can be selected for PLL2) can't be used for USB because it does not meet the accuracy requirements. You will need to provide something external.

    Whitney