TMS320F28075: F28075 CAN interrupt execution time too long

Huihuang Chen

Part Number: TMS320F28075
Other Parts Discussed in Thread: C2000WARE

Hi Champ,

customer found the F28075 " can_loopback_interrupts_cpu01" example CANIntHandler execution time too long at around 5us( CANMessageGet(CANA_BASE, 2, &sRXCANMessage, true);execution time is too long ).

Anymethod to optimize the execution time?

over 7 years ago

0 Todd Anderson78572 over 7 years ago

Guru 14640 points

1. Optimize the C-code. There are various C optimizations that you can use to create your
application. If these are suitable, then you do not need to proceed further.
2. Use pragmas and intrinsics. The compiler has a built-in support that allows you to stay
closer to the assembly code environment. If you can use these and they allow you to stay
within your size/speed constraints, then you do not need to proceed further. You can consider
your application complete at this point.
3. Use assembly language. There are times when optimization and use of pragmas and intrinsics
do not allow you to meet size/speed constraints. At this point, you may need to create a C-callable
assembly language function. (from spra806)

Hopefully, that helps.
Also, what speed are you running the processor?
On some of the C2000 family, things run faster when the routine is run from RAM (not sure if that
is the case with F28075, but it is worth exploring)

0 Christopher Chiarella over 7 years ago

TI__Mastermind 30255 points

In addition to the good suggestions from Todd, if possible, can look at the new CAN driverlib in C2000Ware. This offers a simpler read message function and is the preferred driverlib to use.

~\C2000Ware_1_00_02_00\driverlib\f2807x

Best regards
Chris