Question on using PRUSS

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Other Parts Discussed in Thread: OMAP-L137

I just finished my project with OMAP-L137, but i encountered a problem when using PRUSS to boot from flash ( I don't want to boot ARM by using ARMUBL).I learned that DSP copy some start code to 0XFFFF0000 via PRUSS, and wait in a loop by reading the CONTROL register in the PRUSS when the binary code in the instruction RAM was running. However, every time when the PC pointer run to this waiting-loop, the DSP would run-out, which followed by disconnection from CCS. Finally, I have to do this process by using a delay() function instead, which i don't consider as a good idea. Could anyone tell me how to settle with this problem?

By the way, i've worked on the OMAP-L137 by "barely-run" on CCS, not using linux or DSP/BIOS, does this way have any advantages over using linux?

over 15 years ago

0 Gaurav Agarwal over 15 years ago

TI__Expert 3425 points

To answer part 2) of your questions: Not using OS (Linux or DSP/BIOS) has tradeoffs. You will have to provide all the functionalities/services that your application needs (which would have been provided by OS). On the other hand, your application will have complete control of the system and will not have the performance overheads of using an OS.

Thanks,
Gaurav

0 melissaw over 15 years ago

TI__Genius 15950 points

If I understand correctly, you want to execute code on the PRUSS and have the DSP monitor when the PRUSS has completed executing the code. The PRU Software Development Package (http://focus.ti.com/docs/toolsw/folders/print/sprc940.html) includes a PRU_waitForHalt function in host/common/src/pru.c. Using this function as a model for your waiting-loop may help.

Regards, Melissa

0 ____-__-__ over 15 years ago in reply to melissaw

Intellectual 780 points

Hi Melissa

Thank you for your advice on my problem. I've downloaded the file and found it really helpful, thanks again.

Regards, Huang

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Question on using PRUSS