Can't compile BiSS Firmware for PRU ICSS using PASM

Aaron Kellner

Hi Biser;

You've been very helpful in past and I was wondering if you could offer a clue on this one. I have the pasm tool and tried to compile the BiSS firmware solution supplied with the AM437x IDK card. I get a bunch of errors that all seem to indicate that the compiler doesn't like the LOOP symbol. I checked out the Assembler Guide which pointed me at the Wiki on the PRU instruction set. That doc indicates that there could be a problem with a mismatch between the device's symbol set and the compiler options flag. The instructions in the BiSS master design guide seem to correctly recommend the use of the -V3 compiler flag which would force the compiler to use the LOOP symbol and presumably compile correctly. The problem is that the PASM I have has no option for -V3. It whines when I try to use it. What to do? Is there a newer compiler? Can you send me a link to the latest? If you've heard of this bug is there a known solution?

Thanks,

Aaron Kellner

over 8 years ago

0 Aaron Kellner over 8 years ago

Intellectual 740 points

Anyone???

0 Biser Gatchev-XID over 8 years ago in reply to Aaron Kellner

TI__Guru**** 393215 points

Hi,

Here is the wiki link to PRU-ICSS resources: processors.wiki.ti.com/.../PRU-ICSS

0 Aaron Kellner over 8 years ago in reply to Biser Gatchev-XID

Intellectual 740 points

Hi Biser;

Well, this is not helpful since I have been through all of these references. So, I am using V.7 of the PASM compiler and somehow the .loop compiler command has be redacted from it. Since I see no one else reporting this error, either they found other solutions or had to rewrite the ASM code to remove the pesky .loop commands. Are you sure that the compiler hasn't been updated to recover those commands?

If not, I'll just have to tear it up and rewrite. It already looks to me that the use of the .loop directive is misplaced. After all, how can you do a conditional compile using this .loop directive when you don't know how many times it will be used at runtime? Unless I am totally misreading this code? Maybe there was a macro called loop? I can't find it if so.

So I was hoping for a more ready to go solution than this for the BiSS interface. Not much of a bargain..

0 Biser Gatchev-XID over 8 years ago in reply to Aaron Kellner

TI__Guru**** 393215 points

I have asked for help from a PRU expert on this. They will post directly here.

0 Thomas Mauer over 8 years ago in reply to Aaron Kellner

TI__Expert 4430 points

Hi Aaron,

The original BISS code has been developed with the LOOP instruction and with PASM that supports the -V3 option.

There are multiple options to get the code working by now.
1. As you proposed, substitute the LOOP instructions with a code/macro that performs the delay. For my, this seems like the fastest solution to get the BISS code to work.
2. Get the PASM source code from beagleboard GitHub and compile it - AFAIK this version supports -V3 option. See link here github.com/.../am335x_pru_package
3. Port the BISS PRU code to CCS PRU compiler. CCS PRU compiler supports the -V3 commands.

Hope this helps,
Thomas

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Can't compile BiSS Firmware for PRU ICSS using PASM