AM2612: FFT support on AM261x

Zane Wei

Intellectual 1685 points

Part Number: AM2612

Tool/software:

Hi Team,

Do we have some hardware in AM26x which can used to calculate FFT? Do we have FFT library on AM261x?

Best Regards,

Zane

2 months ago

0 Nilabh Anand 2 months ago

TI__Mastermind 45154 points

Hi Zane,

Please refer to this:

dev.ti.com/.../node

0 Nilabh Anand 2 months ago in reply to Nilabh Anand

TI__Mastermind 45154 points

Also you can find the CFFT example here in SDK:

mcu_plus_sdk/examples/benchmarks/benchmark_demo/cmsis_cfft

Let me know if you need more info.

0 Zane Wei 2 months ago in reply to Nilabh Anand

TI__Intellectual 1685 points

Hi Nilabh,

Thanks for your help! But it maybe have some error in it. Am261x is 500MHz, not 800MHz. And we lack of CMSIS in AM26x SDK. When I try to run it is can't find arm_math.h, So I copy the CMSIS folder which in AM24 SDK to AM26 SDK. But still can't work. I think maybe need to rebuild the library for AM26x. how to do that?

Best Regards,

Zane

0 Zane Wei 2 months ago in reply to Zane Wei

TI__Intellectual 1685 points

Hi Nilabh,

I solved this issue by add cmsis lib to the CCS search path.

I can run with FFT size = 2048. But when set FFT size to 4096, it stop in below line, could you help me?

Best Regards,

Zane

0 Nilabh Anand 1 month ago in reply to Zane Wei

TI__Mastermind 45154 points

Hi Zane,

It went into prefetch abort handler:

A prefetch abort is associated with an instruction fetch as opposed to a data access. When a prefetch abort occurs, the processor marks the prefetched instruction as invalid, but does not take the exception until it executes the instruction.

It might be difficult to debug this just from screenshots. Can you see if the memory for the buffer is sufficient?

Also I will try to check the function to understand the issue better.

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AM2612: FFT support on AM261x