TMDSCNCD28335: F28335 DELAY_US issue using linker file "F28335.cmd"

Arne Greve

Hi,

I've an issue using the DELAY_US macro in my project.

It's just a smal, simple blinking project to get the enviromnent working.

int main(void)
{
    int i = 0;
    InitSysCtrl();
    Gpio_select();
    DINT;
    InitPieCtrl();
    IER = 0x0000;
    IFR = 0x0000;
    InitPieVectTable();
    for (i=0; i<10;i++)
    {
        GpioDataRegs.GPATOGGLE.bit.GPIO31 = 0x1;
        DELAY_US(10000L);
    }
	return 0;
}

When I use the linker file 28335_RAM_lnk.cmd the DELAY_US macro is working.

But using the linker file F28335.cmd the execution of the macro leads to an illegal ISR function:

//
// ILLEGAL_ISR - Illegal operation TRAP
//
interrupt void 
ILLEGAL_ISR(void)
{..}

Where is my fault?

I'm using the following components:

Windows 10 Enterprise 64Bit Build 17763

Code Composer Studio 11.1.

C2000 Compiler TI v21.6.0.LTS

For the F28335:

Docking-Stn USB-EMU TXN100

F28335 control card release 2.2

over 4 years ago

+1 Hareesh Janakiraman over 4 years ago

TI__Guru* 95315 points

That macro is meant to be executed from RAM, not flash. Please copy the function to RAM at run time execute out of RAM. You can use the MemCopy function shown below:

// The  RamfuncsLoadStart, RamfuncsLoadEnd, and RamfuncsRunStart
// symbols are created by the linker. Refer to the F28335.cmd file. 

   MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);

0 Hareesh Janakiraman over 4 years ago in reply to Hareesh Janakiraman

TI__Guru* 95315 points

You need to copy this macro to RAM using pragma. Just apply the pragma to the function that the macro uses.

0 Arne Greve over 4 years ago in reply to Hareesh Janakiraman

Prodigy 80 points

Thank you for your help.

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TMDSCNCD28335: F28335 DELAY_US issue using linker file "F28335.cmd"