Exception when printing a lot of floats

Lars Jansen69

Other Parts Discussed in Thread: SYSBIOS

Hello everyone,

We have been working on a project with a C6678 lately and I ran in some kind of trouble with printing floats.
To print them, we use platform_write. Sometimes, when we print a lot of floats (100+), the DSP throws an exception. The printed floats are all measured values.

Does anyone know how to solve this problem?

Thanks in advance,
Lars Jansen

over 9 years ago

0 Raja over 9 years ago

TI__Guru* 81335 points

Hi Lars,
What is exception you are getting? Please share the exception log. Thank you.

0 Lars Jansen69 over 9 years ago in reply to Raja

Prodigy 200 points

This show up in my log:
[C66xx_0] 8=0x0 A9=0x8640ac
A10=0x0 A11=0x0
A12=0x80017c A13=0xa
A14=0xa A15=0x0
A16=0x8003de A17=0x20
A18=0x8001e0 A19=0x1f0
A20=0x0 A21=0x0
A22=0xff1c4afb A23=0x0
A24=0x100c0246 A25=0xcdb1b3fc
A26=0xa06a41d0 A27=0x0
A28=0x400 A29=0x0
A30=0x400 A31=0x200
B0=0x1 B1=[C66xx_0] 0x860f78
B2=0x0 B3=0x7fffd0
B4=0x864190 B5=0x864188
B6=0xc0275d2 B7=0x0
B8=0x0 B9=0x0
B10=0x800130 B11=0x58
B12=0x8003dd B13=0xc02298c
B14=0x865830 B15=0x800028
B16=0x30 B17=0x80040c
B18=0x2ec95a0c B19=0x3fefead6
B20=0xf22220f6 B21=0x4c19dcc0
B22=0xd B23=0[C66xx_0] x0
B24=0x3f2790b1 B25=0xa7d609df
B26=0xc1f549c0 B27=0xeacdb472
B28=0x0 B29=0x0
B30=0x0 B31=0xffffffff
NTSR=0x1020e
ITSR=0xd
IRP=0xc0275d2
SSR=0x0
AMR=0x0
RILC=0x0
ILC=0x0
Exception at 0x7fffd0
EFR=0x2 NRP=0x7fffd0
Internal exception: IERR=0x1
Instruction f[C66xx_0] etch exception
ti.sysbios.family.c64p.Exception: line 248: E_exceptionMin: pc = 0x007fffd0, sp = 0x00800028.
To see more exception detail, use ROV or set 'ti.sysbios.family.c64p.Exception.ena[C66xx_0] blePrint = true;'
xdc.runtime.Error.raise: terminating execution

0 one and zero over 9 years ago in reply to Lars Jansen69

TI__Genius 17676 points

Hi Lars,

please try increasing stack sizes. In case of an stack overflow you'd return to a wrong address and then fetch an undefined op-code ...

Kind regards,
one and zero

0 Lars Jansen69 over 9 years ago in reply to one and zero

Prodigy 200 points

Hi "One and Zero",

We tried, but it didn't work. Our stack size was (and still is): 65535 Bytes and our Heap memory size was (and still is): 327679 Bytes. So I think that's quite enough.

Kind regards,
Lars Jansen

0 one and zero over 9 years ago in reply to Lars Jansen69

TI__Genius 17676 points

Hi Lars,

your NRP is 0x7fffd0. That means you were trying to execute code from reserved memory. So at some point a branch must have gone wrong.

Of course this could be caused by some other kind of memory corruption, but still I'd recommend to have another look at stacks ...

Here are some good tips:

Kind regards,

one and zero

0 Lars Jansen69 over 9 years ago in reply to one and zero

Prodigy 200 points

So, debugging seems to have worked. We increased the stack size in a different way.

We were trying to increase "Program.stack" in the cfg file but it turned out that we needed to set "Task.defaultStackSize" and that we also had to set "Memory.defaultHeapSize".

Our way to find this:

Task_Stat statbuf; /* declare buffer */
Task_stat(Task_self(), &statbuf); /* call func to get status */
platform_write("%d/%d\n", statbuf.used, statbuf.stackSize);

This code prints the used and the available stack space on the screen.

Don't forget to include: #include "ti/sysbios/knl/Task.h"

Thanks for all your help!

0 one and zero over 9 years ago in reply to Lars Jansen69

TI__Genius 17676 points

Hi Lars,

thanks for sharing your re-solution.

Kind regards,
one and zero

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Exception when printing a lot of floats