F28M36P63C2: M3 bootloader to application: application wont run

Regis,

Do you see a reset/toggle on XRSn?
Does your application service watchdog as needed?
Do you have any initialized sections mapped to RAM directly in your linker cmd?

You might have programmed ECC - I remember you say so in another post sometime last week.

Thanks and regards,
Vamsi

Also, do you have any IPC communication between the cores? If yes, did you check whether your code passed through it or not? - Toggle a GPIO after that and check for it.

Thanks and regards,
Vamsi

Thank you once again.
I am only using the M3 right not. No IPC code yet.
EEC is set to auto in the debug GUI.
I am currently adding code to codestartbranch to disable the watchdog.

I will address the other items as you recommend.

I am looking for an M3 codestartbranch.asm that includes watchdog disable but cant seem to find one.

Regis,

If you want to disable it, check WatchdogResetDisable() function at controlSUITE\device_support\f28m36x\v210\MWare\driverlib\watchdog.c.

Also, checkout RCGC0 register in SPRUHE8D.

Thanks and regards,
Vamsi

I was thinking something in assembly I can add to codestartbranch similar to this from DSP2833x_CodeStartBranch.asm :


**********************************************************************
* Function: wd_disable
*
* Description: Disables the watchdog timer
***********************************************************************
.if WD_DISABLE == 1

.text
wd_disable:
SETC OBJMODE ;Set OBJMODE for 28x object code
EALLOW ;Enable EALLOW protected register access
MOVZ DP, #7029h>>6 ;Set data page for WDCR register
MOV @7029h, #0068h ;Set WDDIS bit in WDCR to disable WD
EDIS ;Disable EALLOW protected register access
LB _c_int00 ;Branch to start of boot.asm in RTS library

.endif

;end wd_disable

Regis,

you should be able to call the driver lib function from your start up code. If you want to use assembly, then I would suggest to first put the call in a C code and put a break point at the entry and inspect dis-assembly to understand how to write the function in assembly. You can also generate assembled code using one of the build options and inspect the compiler generated assembler code for the file.

we don't have a direct assembly code in our libraries for disabling watchdog.

Also, I don't think watchDOG is enabled by default on ARM side. Can you check the TRM and the boot ROM chapter of TRM? if watchDOG is enabled by boot ROM it will be shown in the boot flow diagram.

Best Regards

Santosh Athuru

Regis,

Just wanted to know: In which step is it hanging?

Thanks and regards,
Vamsi

I step though the code and it was resetting at:
SysCtlClockConfigSet(SYSCTL_SYSDIV_1 | SYSCTL_M3SSDIV_2 | SYSCTL_USE_PLL |
(SYSCTL_SPLLIMULT_M & 0x0F));

I removed this from the application and it runs as expected.

Regis,

Can you step in and see which exact instruction is causing the reset for you?

Thanks and regards,
Vamsi

It might be SysCtlClockPllConfig(ClkSrcReq, (PllMult));
Its a bit hard to debug.