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TMS320F280049: FPUmathTable and RFFT_f32

Taeyeong Kim
Prodigy 70 points
Part Number: TMS320F280049


I'm using RFFT_f32 FFT on F280049. FFT size is 1024.

Using HAMMING1024, Not using USE_TABLES (Twiddle factor table?)
When I download program to FLASH with XDS100i, It works good.

But after power up without JTAG?, the FFT result get crazy.

I got a message when I build.


warning #10247-D: creating output section "FPUmathTables" without a SECTIONS specification
warning #10210-D: creating ".esysmem" section with default size of 0x400; use the -heap option to change the default size

And I add description to generic_flash_lnk.cmd

FPUTABLES : origin = 0x3FEBDC, length = 0x0006A0 /* FPU Tables in Boot ROM

FPUmathTables : > FPUTABLES, PAGE = 0, TYPE = NOLOAD


But the FFT return 95% of 32767.

  • 0
    TI__Expert 5410 points

    Hi,

    Taeyeong Kim said:

    FPUTABLES : origin = 0x3FEBDC, length = 0x0006A0 /* FPU Tables in Boot ROM

    FPUmathTables : > FPUTABLES, PAGE = 0, TYPE = NOLOAD

    In order to use RAM_ROMTABLES configuration, you must set USE_TABLES = 1 in the predefined symbols setting. Also, you must include the bootROM symbols lib as applicable as stated in the documentation. It is possible that incorrectly accessing the tables is contributing to your error.

    -Shantanu