MCU won't start after disconnecting JTAG

Hi Gautam,

Thanks for the quick reply. A question regarding some of the steps: Do I add the two first statements (MemCopy...) inside main(), or somewhere else??

For the last step (Configure your GPIO's to boot fo flash) - How is this performed?

Thank you Gautam.

This was helpful, but I'm currently stuck in a function called DELAY_US. During debugging (and normal execution), the execution does not go past this piece of code (.asm):

It does not go past the line called BF, but the message: "No source available for "0x3ff782"" comes when I execute that line, every time.

Any suggestions here? This file is called "F2806x_usDelay.asm".

Going through the example you mentioned, I see that the function "memcpy" is used, rather than what you suggested - "MemCopy". Regardless, it doesn't seem like I'm able to write to flash, because every time I start the MCU now, it's the Flash example program that runs, not my program.

Current snippets of code:

#include "DSP28x_Project.h"
#include "Motor.h"
#include "System.h"
#include "Spi.h"
#include "Math.h"
#include "Adc.h"

extern Uint16 RamfuncsLoadStart;
extern Uint16 RamfuncsLoadEnd;
extern Uint16 RamfuncsRunStart;

void main()
{
	initializeSystemClocks();
	//initializeAdc()
	initializeGpio();
	initializeSpi();
	initializeMotors();

	testLedOn();

	// ...
	// Lots of code, regarding ePWM
	// ...

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

	while(1) {}
}

What happens when I debug:

When I get to the line InitFlash();, the Flash example code starts running, rather than my code.

Hi again Gautam,

I appreciate your help. However I'm having some trouble.

After reviewing the example code, and modified my code accordingly, I find that I still have some issues. I will try to explain it briefly.

This is the code of my main document currently:

#include "DSP28x_Project.h"
#include "Motor.h"
#include "System.h"
#include "Spi.h"
#include "Math.h"
#include "Adc.h"

extern Uint16 RamfuncsLoadStart;
extern Uint16 RamfuncsLoadEnd;
extern Uint16 RamfuncsRunStart;
extern Uint16 RamfuncsLoadSize;

void main()
{
	InitSysCtrl();
	DINT;
	InitPieCtrl();
    IER = 0x0000;
    IFR = 0x0000;
	InitPieVectTable();

	memcpy(&RamfuncsLoadStart, &RamfuncsLoadEnd, (Uint32)&RamfuncsRunStart);
	InitFlash();
	EINT;   // Enable Global interrupt INTM
	ERTM;   // Enable Global realtime interrupt DBGM

	while(1) {}
}

This has the same structure as the example code: First calling InitSysCtrl(), then DINT, InitPieCtrl(), disabling CPU interrupts, then calling InitPieVectTable(), before running memcpy() and InitFlash(). Later in the code, EINT and ERTM is called.

The behaviour when debugging is as follows:

I can step over functions including line 22:  memcpy(&RamfuncsLoadStart, &RamfuncsLoadEnd, (Uint32)&RamfuncsRunStart);

When I then try to step over line 23:  InitFlash();

The debugger takes me into F2806x_DefaultIsr.c, to the function __interrupt void RTOSINT_ISR(void)   // RTOS interrupt.

This indicates an illegal call has been made, so I try to run again, stepping into InitFlash(). Inside InitFlash(), trying to step past FlashRegs.FOPT.bit.ENPIPE = 1;, the debugger takes me to the same RTOSINT_ISR function.

I believe my code is functionally same as the example I mentioned (which runs fine), but I cannot figure out how to make this run.

Do you have any ideas?

Excellent Glenn! Nice to know you were successful in realizing the standalone operation through Flash.

Goodluck & Regards,
Gautam