C5515 FFT Documentation Erratum

Jason51114

Section 4.4, page 13 of SPRABB6, the documentation for the C5505/5515's hardware FFT accelerator, appears to be incorrect. More specifically, the column in Table 2 indicating the ROM addresses for the FFT routines for PG 2.0 are not correct for the device that is on my EVM5515. I only made use of the 1024-point FFT, so I only searched for its implementation in ROM. The document indicates that the 1024-point FFT function is at address 0x00FF7A3E. Instead, on my C5515 device, the function actually begins at 0x00FF7A56. Jumping to the location specified in the document causes the expected bad things that happen when you jump to the middle of a routine.

I suspect that the other FFT routine addresses may be wrong also; I only checked the 1024-point case.

over 15 years ago

0 Mark M over 15 years ago

TI__Mastermind 30140 points

Hi Jason,

You are absolutely right! The ROM locations listed in SPRABB6 are incorrect for the C5505/C5515 (PG2.0).

The corrected ROM locations are listed below:

/* PG 2.0 */
_hwafft_br = 0x00ff6cd6;
_hwafft_8pts = 0x00ff6cea;
_hwafft_16pts = 0x00ff6dd9;
_hwafft_32pts = 0x00ff6f2f;
_hwafft_64pts = 0x00ff7238;
_hwafft_128pts = 0x00ff73cd;
_hwafft_256pts = 0x00ff75de;
_hwafft_512pts = 0x00ff77dc;
_hwafft_1024pts = 0x00ff7a56;

I have tested each address on the C5515 just to make sure they are correct. I also tested the VC5505 (PG1.4) ROM addresses, and they are correct.

Thank you for catching this mistake. I will update the SPRABB6 document with the corrected ROM addresses.

Regards,
Mark

0 Anand Chandrasekhar over 12 years ago in reply to Mark M

Intellectual 525 points

Hi Mark Mckeown and Jason,

Could you please help me out in the fft code.

What i am doing is caputuring a signal for 10s and , I want to compute the FFT.
When i am running my code, I am not able to get the FFT computed. As soon as the code reaches the FFT computation part, it just stands still.
So , I stopped the running to see what is getting executed. The code gets stuck here

8e49bdeb1110             COPR #16,AC0,dbl(*AR2-),AC1 :: MOV AC1,dbl(*(AR3+T0))
8e49bdeb1110             COPR #16,AC0,dbl(*AR2-),AC1 :: MOV AC1,dbl(*(AR3+T0))
8e49bdeb1110             COPR #16,AC0,dbl(*AR2-),AC1 :: MOV AC1,dbl(*(AR3+T0))
8e49bdeb1110             COPR #16,AC0,dbl(*AR2-),AC1 :: MOV AC1,dbl(*(AR3+T0))

I am not sure , what exactly these statements does. But all the lines are same !!

If i step debug this, it loops arround these lines.

But, If i give a run and stop , it get stuck @

040009 BCC #0x3d12c3,AC0 == #0

and if I give a run again : I get an error message saying I cant do tht !!!!!!

I am struggling with this issue for the past 2-3 days. It will be a great help, If you can tell me how to solve this.
I have a breif code structure, which shows how I am computing FFT. Please have a look.

This is my code
==================================================================================================================================
#include "stdio.h"
#include "usbstk5515.h"
#include "usbstk5515_led.h"
#include "usbstk5515_gpio.h"
#include "usbstk5515_i2c.h"
#include "sar.h"
#include "lcd.h"
#include "hwafft.h"
#include "math.h"

Int32 Input_Signal1024];
extern Uint16 hwafft_wrapper( Int32 *data,Int32 *scratch,Uint16 fft_flag,Uint16 scale_flag,hwafft_func_t fft_func);
Int32* fft(Int32 *data);

void main( void )
{
   Int16 result = 0;Int32 *fft_data = 0;
    USBSTK5515_init( );
  Input_Signal = Aquire_signal_from_ADC_for_10s();
    fft_data = fft( Input_Signal);
    while(1);
}

Int32* fft(Int32 *data)
{
   Int32 *result = 0;
   Int32 *data_br = 0;
   Uint16 out_sel = 0;
   Int32 *scratch= 0;
   hwafft_br(data,data_br,DATA_LEN_1024); // bit reversal
   data = data_br;
   out_sel = hwafft_wrapper(data,scratch,FFT_FLAG,SCALE_FLAG,hwafft_1024pts); // I am using this because, I am using large memory model
    if (out_sel == OUT_SEL_DATA)
   {
       result = data;
   }
   else
   {
       result = scratch;
   }
   return(result);
}
===================================================================================================================================
===================================================================================================================================

I have defined the below code in an assembly file. I got this code snippet from TI forum. I was asked to use this since I am using large memory model. It seems
FFT accelerator supports only small memory model

         .sect ".onchip_code"
        .def _hwafft_wrapper
       ; HWAFFT code burned in C5515 ROM seems to support small memory model only.
       ; The following wrapper helps to use HWAFFT for large/huge memory models.
       ; CVN 20110920
_hwafft_wrapper:
    XAR2 = XAR1
    XAR3 = XAR0
    call AC0
    return

I have defined the below code in a C header file.(USBSTK5515.h)

typedef Uint16 (*hwafft_func_t)(Int32 *data,
                                Int32 *scratch,
                                Uint16 fft_flag,
                                Uint16 scale_flag);
Uint16 hwafft_wrapper( Int32 *data,
                        Int32 *scratch,
                        Uint16 fft_flag,
                        Uint16 scale_flag,
                        hwafft_func_t fft_func);

===================================================================================================================================
===================================================================================================================================

The following is my .cmd file

-stack    0x400                /* PRIMARY STACK SIZE    */
-sysstack 0x400                /* SECONDARY STACK SIZE */
-heap     0x400               /* HEAP AREA SIZE        */
MEMORY
{
   MMR     (RW) : origin = 0000000h length = 0000c0h    /* MMRs */
   DARAM_0 (RW) : origin = 00000c0h length = 001f40h   /* on-chip DARAM 0 */
    DARAM_1 (RW) : origin = 0002000h length = 002000h   /* on-chip DARAM 1 */
    DARAM_2 (RW) : origin = 0004000h length = 002000h   /* on-chip DARAM 2 */
    DARAM_3 (RW) : origin = 0006000h length = 002000h   /* on-chip DARAM 3 */
    DARAM_4 (RW) : origin = 0008000h length = 002000h   /* on-chip DARAM 4 */
    DARAM_5 (RW) : origin = 000a000h length = 002000h   /* on-chip DARAM 5 */
    DARAM_6 (RW) : origin = 000c000h length = 002000h   /* on-chip DARAM 6 */
    DARAM_7 (RW) : origin = 000e000h length = 002000h   /* on-chip DARAM 7 */
    SARAM   (RW) : origin = 0010000h length = 040000h   /* on-chip SARAM */
    SAROM_0 (RX) : origin = 0fe0000h length = 008000h    /* on-chip ROM 0 */
    SAROM_1 (RX) : origin = 0fe8000h length = 008000h    /* on-chip ROM 1 */
    SAROM_2 (RX) : origin = 0ff0000h length = 008000h    /* on-chip ROM 2 */
    SAROM_3 (RX) : origin = 0ff8000h length = 007f00h    /* on-chip ROM 3 */
   VECS    (RX) : origin = 0ffff00h length = 000100h   /* on-chip ROM vectors */
    EMIF_CS0 (RW) : origin = 0050000h length = 07B0000h   /* mSDR */
   EMIF_CS2 (RW) : origin = 0800000h length = 0400000h   /* ASYNC1 : NAND */
   EMIF_CS3 (RW) : origin = 0C00000h length = 0200000h   /* ASYNC2 : NAND */
   EMIF_CS4 (RW) : origin = 0E00000h length = 0100000h   /* ASYNC3 : NOR */
   EMIF_CS5 (RW) : origin = 0F00000h length = 00E0000h   /* ASYNC4 : SRAM */
}
SECTIONS
{
    vectors (NOLOAD)
    .intvec                         : > DARAM_0       ALIGN = 256
    .bss                             : > SARAM        /*, fill = 0 */
    .stack       : > DARAM_1     ALIGN = 1024
    .sysstack                    : > DARAM_1    ALIGN = 1024
    .heap          : > DARAM_1       ALIGN = 1024
    .text            : > SARAM       ALIGN = 1024
    .onchip_code            : > SARAM
   .cinit          : > DARAM_2
   .cio              : > DARAM_2
   .const          : > DARAM_2

// The Bit-Reverse destination buffer data_br_buf requires an address with
// at least 4+log2(FFT_LENGTH) least significant binary zeros

   data_br_buf    : > DARAM_1       ALIGN = 1024
    scratch_buf       : > DARAM_1       ALIGN = 1024
   convolved_buf   : > DARAM_2
   coeffs_fft_buf   : >   DARAM_2

   RcvL1           : > DARAM_3
   RcvL2           : > DARAM_3
   RcvR1           : > DARAM_4
   RcvR2           : > DARAM_4

   FilterOut   : > DARAM_5
   OverlapL   : > DARAM_5
   OverlapR   : > DARAM_5

   XmitL1       : > DARAM_6
   XmitL2       : > DARAM_6
   XmitR1       : > DARAM_7
   XmitR2       : > DARAM_7

   RcvL1_copy   : > SARAM
   RcvL2_copy   : > SARAM
   RcvR1_copy   : > SARAM
   RcvR2_copy   : > SARAM

   .emif_cs0   : > EMIF_CS0
   .emif_cs2   : > EMIF_CS2
   .emif_cs3   : > EMIF_CS3
   .emif_cs4   : > EMIF_CS4
   .emif_cs5   : > EMIF_CS5
}

Following is my console output:

**** Build of configuration Debug for project first_Project ****

E:\TI\ccsv4\utils\gmake\gmake -k all
'Building file: ../csl_irqplug.asm'
'Invoking: Compiler'
"E:/TI/ccsv4/tools/compiler/c5500/bin/cl55" -vcpu:3.3 -g --include_path="E:/TI/xdais_6_25_01_08/packages/ti/xdais" --include_path="E:/C5505/CD/C5505/Chapter 1/Application 1 Getting Started" --include_path="E:/TI/ccsv4/emulation/boards/usbstk5515_v1/include" --include_path="E:/TI/ccsv4/tools/compiler/c5500/include" --include_path="E:/TI/bios_5_41_02_14" --include_path="E:/TI/bios_6_21_00_13" --include_path="E:/C5505/CSL/build" --include_path="E:/C5505/CSL/inc" --include_path="E:/C5505/CSL/src" --diag_warning=225 --ptrdiff_size=32 --algebraic --memory_model=large --asm_source=algebraic --preproc_with_compile --preproc_dependency="csl_irqplug.pp" "../csl_irqplug.asm"
'Finished building: ../csl_irqplug.asm'
' '
'Building file: ../main.c'
'Invoking: Compiler'
"E:/TI/ccsv4/tools/compiler/c5500/bin/cl55" -vcpu:3.3 -g --include_path="E:/TI/xdais_6_25_01_08/packages/ti/xdais" --include_path="E:/C5505/CD/C5505/Chapter 1/Application 1 Getting Started" --include_path="E:/TI/ccsv4/emulation/boards/usbstk5515_v1/include" --include_path="E:/TI/ccsv4/tools/compiler/c5500/include" --include_path="E:/TI/bios_5_41_02_14" --include_path="E:/TI/bios_6_21_00_13" --include_path="E:/C5505/CSL/build" --include_path="E:/C5505/CSL/inc" --include_path="E:/C5505/CSL/src" --diag_warning=225 --ptrdiff_size=32 --algebraic --memory_model=large --asm_source=algebraic --preproc_with_compile --preproc_dependency="main.pp" "../main.c"
"E:\TI\ccsv4\emulation\boards\usbstk5515_v1\include\usbstk5515.h", line 144: warning: typedef name has already been declared (with same type)
"E:\TI\ccsv4\emulation\boards\usbstk5515_v1\include\usbstk5515.h", line 144: warning: typedef name has already been declared (with same type)
"E:\TI\ccsv4\emulation\boards\usbstk5515_v1\include\usbstk5515.h", line 144: warning: typedef name has already been declared (with same type)
"E:/TI/ccsv4/emulation/boards/usbstk5515_v1/include/usbstk5515.h", line 144: warning: typedef name has already been declared (with same type)
"../main.c", line 33: warning: integer conversion resulted in a change of sign
"../main.c", line 34: warning: integer conversion resulted in a change of sign
"../main.c", line 341: warning: last line of file ends without a newline
'Finished building: ../main.c'
' '
'Building file: ../sample_code.c'
'Invoking: Compiler'
"E:/TI/ccsv4/tools/compiler/c5500/bin/cl55" -vcpu:3.3 -g --include_path="E:/TI/xdais_6_25_01_08/packages/ti/xdais" --include_path="E:/C5505/CD/C5505/Chapter 1/Application 1 Getting Started" --include_path="E:/TI/ccsv4/emulation/boards/usbstk5515_v1/include" --include_path="E:/TI/ccsv4/tools/compiler/c5500/include" --include_path="E:/TI/bios_5_41_02_14" --include_path="E:/TI/bios_6_21_00_13" --include_path="E:/C5505/CSL/build" --include_path="E:/C5505/CSL/inc" --include_path="E:/C5505/CSL/src" --diag_warning=225 --ptrdiff_size=32 --algebraic --memory_model=large --asm_source=algebraic --preproc_with_compile --preproc_dependency="sample_code.pp" "../sample_code.c"
At end of source: warning: a translation unit must contain at least one declaration
'Finished building: ../sample_code.c'
' '
'Building file: ../vectors.asm'
'Invoking: Compiler'
"E:/TI/ccsv4/tools/compiler/c5500/bin/cl55" -vcpu:3.3 -g --include_path="E:/TI/xdais_6_25_01_08/packages/ti/xdais" --include_path="E:/C5505/CD/C5505/Chapter 1/Application 1 Getting Started" --include_path="E:/TI/ccsv4/emulation/boards/usbstk5515_v1/include" --include_path="E:/TI/ccsv4/tools/compiler/c5500/include" --include_path="E:/TI/bios_5_41_02_14" --include_path="E:/TI/bios_6_21_00_13" --include_path="E:/C5505/CSL/build" --include_path="E:/C5505/CSL/inc" --include_path="E:/C5505/CSL/src" --diag_warning=225 --ptrdiff_size=32 --algebraic --memory_model=large --asm_source=algebraic --preproc_with_compile --preproc_dependency="vectors.pp" "../vectors.asm"
'Finished building: ../vectors.asm'
' '
'Building target: first_Project.out'
'Invoking: Linker'
"E:/TI/ccsv4/tools/compiler/c5500/bin/cl55" -vcpu:3.3 -g --diag_warning=225 --ptrdiff_size=32 --algebraic --memory_model=large --asm_source=algebraic -z -m"first_Project.map" --warn_sections -i"E:/TI/ccsv4/tools/compiler/c5500/lib" -i"E:/C5505/CSL/first_Project/../../lib" -i"E:/TI/ccsv4/tools/compiler/c5500/include" --reread_libs --rom_model -o "first_Project.out" "./vectors.obj" "./sample_code.obj" "./main.obj" "./csl_irqplug.obj" -l"E:\TI\ccsv4\tools\compiler\c5500\lib\rts55x.lib" -l"E:\C5505\CD\C5505\Chapter 1\Application 1 Getting Started\55xdsph.lib" -l"E:\C5505\CSL\build\cslVC5505.lib" -l"E:\TI\ccsv4\tools\compiler\c5500\lib\lib\usbstk5515bsl.lib" "../C5515.cmd"
<Linking>
'Finished building target: first_Project.out'
' '
Build complete for project first_Project

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C5515 FFT Documentation Erratum