AM3358: DMTimer bare metal example not invoking timer ISR

Raj Johri

Part Number: AM3358

Hi,

I was trying to execute DMTimer bare metal code on beagle bone black provided in Starterware examples. The code executes and starts the timer, however ISR is not invoked as expected. I can see interrupt raised in the timer register, but ISR is not at all invoked.

After a fraction of seconds the code goes into global exit:

void _exit(int code)
{
asm(" .global C$$EXIT");
asm("C$$EXIT:");
while(1){};
}

I went through the link: BEAGLEBK: DMTimer Example using Starterware - NOT WORKING!!! - BeagleBone Black + TIRTOS V6 - Processors forum - Processors - TI E2E support forums

But it didn't seem to resolve the bare metal code issue.

Please let me know what is going wrong, why it is unable to raise the timer ISR?

Thanks and Regards

Raj Johri

over 3 years ago

0 Jianzhong Xu over 3 years ago

TI__Mastermind 46995 points

Hi Raj,

According to the thread you referred, the DMTimer example in starterware worked OOB for Frank. I can try it out. Do you have a JTAG to load the code to your beagle bone black or do you flash the image to SD card?

Thanks,

Jianzhong

0 Raj Johri over 3 years ago in reply to Jianzhong Xu

Prodigy 200 points

Hi Jianzhong,

Can you explain meaning of OOB?

I am using JTAG to load the code on BBB.

Thanks,

Raj

0 Nick Saulnier over 3 years ago in reply to Raj Johri

TI__Guru* 83725 points

Hello Raj,

OOB stands for out-of-box. Jianzhong is out of office this week, but he will return next week.

Regards,

Nick

0 Raj Johri over 3 years ago in reply to Nick Saulnier

Prodigy 200 points

Thanks for response Nick, but still I did not understand technical meaning of OOB. Right now I am flashing the code through JTAG. So what exactly OOB means? Is it a different way of loading the code to BBB?

Can you please provide a clear explanation on how to try this OOB on BBB?

Thanks and Regards

Raj Johri

0 Nick Saulnier over 3 years ago in reply to Raj Johri

TI__Guru* 83725 points

Hello Raj,

Out of Box means that the software should work without needing to make any modifications. So you should be able to take an EVM board without any modifications, and then run the software without making any modifications (as if you had just taken the EVM "out of the box" it was shipped in, and then started the code).

I only work with Linux, so we will have to wait for Jianzhong to return next week if you are not able to find "getting started" steps for running unmodified starterware examples.

Regards,

Nick

0 Jianzhong Xu over 3 years ago in reply to Nick Saulnier

TI__Mastermind 46995 points

Hi Raj,

Just to confirm, did you get the example from the starterware in the PDK which is part of the Processor SDK? Did you use the pre-built binary? If yes, which one did you load and run?

Thanks and regards,

Jianzhong