RTOS/CC2640: Trying to load other program in custom bootloader

Justin Mclean

Part Number: CC2640

Tool/software: TI-RTOS

Hi,

I'm trying to make a custom boot loader what swaps between two programs on on CC2640 and have run into a few issues and was hoping someone can help.

First off I'm using SysCtrlSystemReset() to rest the device. It does not reset when running in debug mode but the program freezes is this expected behaviour?

To jump to another location I'm using this code but it fails to start the other program:

__asm("LDR R0, [location]");
__asm("ORR R0, #1");
__asm("BX R0");

I'm aware of the issues with have TI-RTOS in the ROM, making the code relocatable and changing the reset vector to page 1.

I've looked at a (large) number of other posts and the advice around boot loaders seems a little inconclusive. For instance does trimDevice() need to be called or not and if so how?

Thanks,
Justin

over 8 years ago

0 Christin Lee over 8 years ago

TI__Guru 56575 points

Have you checked out our github example regarding serial bootloader? If not, I would recommend you to take a look at it.
github.com/.../serial_bootloader.md

When you reset the device with debugger attached, CC26xx will stay in Halt in Boot, so nothing will be executed. That means what you are seeing is normal.

0 Justin Mclean over 8 years ago in reply to Christin Lee

Prodigy 150 points

Hi,

Thanks for the response. I'm not using the serial boot loader as I need a custom one but yes I have looked at that example in detail.

So is there any way to use the debug after calling SysCtrlSystemReset? Or another way of rebooting the device and continue debugging?

Thanks,
Justin

0 Christin Lee over 8 years ago in reply to Justin Mclean

TI__Guru 56575 points

Hi,

You can always try attach to running target after you reset your device.

0 Justin Mclean over 8 years ago in reply to Christin Lee

Prodigy 150 points

Hi,

Thanks again.

So I did managed to get as far as rerunning the current program again via:
asm(" MOV R0, #0x0000 ");
asm(" LDR SP, [R0, #0x0] ");
asm(" LDR R1, [R0, #0x4] ");
asm(" BX R1 ");

Any suggestion why 0x0000 with another correct location may not work?

Thanks,
Justin

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RTOS/CC2640: Trying to load other program in custom bootloader