TMS320F280049: After configuring DCSM, the program does not run normally

Ben Qin

Intellectual 2690 points

Part Number: TMS320F280049

Hi Team,

There's an issue from the customer need your help:

All programs are stored in the sector of Bank0, and some functions run in RAM.

Most of the code runs in main's main while, and timers interrupt control the call cycle of each function.

1. Without encryption, the program runs normally.

2. Zone1 encrypts Bank0 and Bank1 without encrypting RAM, Zone2 does not encrypt RAM, Bank0 and Bank1,

Through CCS online DEBUG, the program runs normally

Without CCS, the program runs independently, the program cannot run as expected, only one indicates that the running LED flashes, and other communication functions are not normal.

This LED is called in main.while in cycles of 1ms, and its blink control flag is timed in the ADC interrupt.

Try to move the LED control code to a different function, but find that the LED does not blink normally. That is, many functions are not called.

The register values are as follows:

Zone1:

EXEONLYRAM :0x000000FF

EXEONLYSECT :0x0000FFFF

B0_GRABSECT :0x55555555 ; Zone1 encrypts Bank0

B1_EXEONLYSECT :0x0000FFFF

B1_GRABSECT :0x55555555 ; Zone1 encrypts Bank1

Zone2:

EXEONLYRAM :0x000000FF

EXEONLYSECT :0x0000FFFF

B0_GRABSECT :0xAAAAAAAA ; Zone2 does not encrypt Bank0

B1_EXEONLYSECT :0x0000FFFF

B1_GRABSECT :0xAAAAAAAA ; Zone2 does not encrypt Bank1

Excuse me, what are the possible reasons for this situation?

Thanks & Regards,

Ben

over 1 year ago

0 Hareesh Janakiraman over 1 year ago

TI__Guru* 95315 points

Ben Qin said:
1. Without encryption, the program runs normally.

First of all, the word "encrypt" should not be used, since there is no encryption here. The correct word is "secure". So, what you are saying is that the application runs correctly as long as the device is unsecure, but does not work correctly once the device is secured by passwords. Is this correct?

Ben Qin said:
2. Zone1 encrypts Bank0 and Bank1 without encrypting RAM, Zone2 does not encrypt RAM, Bank0 and Bank1,

I don’t understand what you mean by the above. Both Bank0 and Bank1 have their own Z1 & Z2. Are you saying Banks 0 & 1 both encrypt Z1's Flash but not RAM? And Z2 is not allocated any resources in both banks?

Ben Qin said:
Through CCS online DEBUG, the program runs normally

Are you saying that the application runs correctly when connected to CCS but not in standalone mode? If so, this indicates that there could be initialized constants in RAM. It is very important to isolate the problem to this phenomenon or a DCSM-related issue.

If the problem is indeed related to DCSM, please take a look at the two posts below:

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1252618/tms320f280025c-after-secure-the-device-by-dcsm-the-program-cannot-run-after-repower-on

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/768778/tms320f280049-code-can-t-run-after-implementing-the-dcsm-feature-in-f280049

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TMS320F280049: After configuring DCSM, the program does not run normally