Compiler/TMS320F28379D: ISR doesn´t start when executed from Flash

Part Number:TMS320F28379D

Tool/software: TI C/C++ Compiler

Hi,

I´am facing some difficulties with changing from RAM to FLASH:

Timer0 gets called ever sec and an GPIO gets Toggled. Before the Timer gets Enabled the Gpio gets Toggled 5 times.

If I download the programm to the FLASH everything works fine. But if i restart the Controller. The GPio Toggles 5 time (which is not Timer0 controlled) but after this nothing happens,

It seems to me that the memcpy isrfnc is the problem. The ISR is linked via the isr.cmd

#include "F28x_Project.h"
#include "F2837xD_Ipc_drivers.h"

extern uint16_t isrfuncLoadStart;
extern uint16_t isrfuncLoadEnd;
extern uint16_t isrfuncRunStart;
extern uint16_t isrfuncLoadSize;

__interrupt void cpu_timer0_isr(void);

#pragma CODE_SECTION(cpu_timer0_isr,"isrfunc")

#ifdef _FLASH

extern Uint16 RamfuncsLoadStart;
extern Uint16 RamfuncsLoadSize;
extern Uint16 RamfuncsRunStart;
#endif

void main(void)
{

#ifdef _FLASH
  EALLOW;
  Flash0EccRegs.ECC_ENABLE.bit.ENABLE = 0;
  memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
  memcpy(&isrfuncRunStart, &isrfuncLoadStart, (uint32_t)&isrfuncLoadSize); //  Copy ISR routine to a specified RAM location to determine the size
  EDIS;
#endif
  
    InitSysCtrl();
    
    InitGpio();

    EALLOW;
    GpioCtrlRegs.GPADIR.bit.GPIO31 = 1;
    GpioDataRegs.GPACLEAR.bit.GPIO31 = 1;
    GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1;
    GpioDataRegs.GPBCLEAR.bit.GPIO34 = 1;
    EDIS;


    EALLOW;
    ClkCfgRegs.CLKSRCCTL3.bit.XCLKOUTSEL = 0;  // *8 = SYSCLK
    ClkCfgRegs.SYSCLKDIVSEL.bit.PLLSYSCLKDIV = 0;
    ClkCfgRegs.LOSPCP.bit.LSPCLKDIV = 0; // Set LSPCKL (Clock for UART) to SYSCKL  (=160MHz)
    GpioCtrlRegs.GPCMUX1.bit.GPIO73 = 3;
    EDIS;

    DINT;

    InitPieCtrl();

//
// Disable CPU interrupts and clear all CPU interrupt flags:
//
    IER = 0x0000;
    IFR = 0x0000;

    InitPieVectTable();

    EALLOW;
    PieVectTable.TIMER0_INT = &cpu_timer0_isr;
    EDIS;

    InitCpuTimers();

    ConfigCpuTimer(&CpuTimer0, 160, 100000);

    CpuTimer0Regs.TCR.all = 0x4000;

    EINT;  // Enable Global interrupt INTM
    ERTM;  // Enable Global realtime interrupt DBGM

    int i;
    for(i=0;i<5;i++)
           {
               GpioDataRegs.GPBSET.bit.GPIO34 = 1;
               GpioDataRegs.GPASET.bit.GPIO31 = 1;
               DELAY_US(1000*500);
               GpioDataRegs.GPBCLEAR.bit.GPIO34 = 1;
               GpioDataRegs.GPACLEAR.bit.GPIO31 = 1;
               DELAY_US(1000*500);
           }
    IER |= M_INT1;

    PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
}

__interrupt void cpu_timer0_isr(void)
{

    GpioDataRegs.GPBTOGGLE.bit.GPIO34 = 1;
    CpuTimer0.InterruptCount++;

    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

With kind regards

Manuel