TMS320F280049: Is there a register that remains its value after soft reset?

refer this thread e2e.ti.com/.../803488

Hello Baskaran,

Thank you for the link.

It is stated there that HIBBOOTMODE register can be used. But TMS320F280049 doesn't have hibernate feature as well as HIBBOOTMODE register.
Is there any other possibilities?

Best regards,
Victor

yes, hibernate feature is not present in F28004x. You may have to use option 1 or 2 discussed in the link i gave.

Regards
Baskaran

Approach 1 (wait certain time foe SCI boot) is not an option since in my case dedicated serial protocol has to be used.
Approach 2 ( SW controlled Custom Boot Pin) is very interesting but unfortunately HW modifications isn't possible.

I'm wondering if it is possible to use Software NMI error. Something like that:

In application:
1. Set SWERR in NMIFLGFRC register
2. Wait until NMI watchdog reset

In bootloader;
1. Check reset source
2. In case of NMI watchdog reset check NMISHDFLG register
3. If bit SWERR is set - start bootloader, in any other case - start application.

Could it be like this?

Vivek,

The idea is to tell one speicific reset case which means that bootlpader has to be started. WD reset can be triggered if the SW stucks. But if I don't use SWERR NMI reset for other puroses than I can tell that I need to start bootloader in case when SWERR is set.

Best regards,
Victor

Ok, understood. That should work.