Hello, I am a beginner in C6678 dsp and i am quite interested in it!
The question is that I debug a float fft project in the dsplib for c6678.this project is in the path c:\ texas instruments\dsplib_c66x_3_0_0_7\packages\ti\dsplib\src\dspf_sp_fftspxsp.
I use cycle approximate simulator,little endian,only core 0 running.release mode.
the link.cmd is as follow:
-heap 0x8000
-stack 0xC000
MEMORY
{
L2SRAM (RWX) : org = 0x800000, len = 0x100000
MSMCSRAM (RWX) : org = 0xc000000, len = 0x200000
}
SECTIONS
{
.kernel: {
*.obj (.text:optimized) { SIZE(_kernel_size) }
}
.text: load >> L2SRAM
.text:touch: load >> L2SRAM
GROUP (NEAR_DP)
{
.neardata
.rodata
.bss
} load > L2SRAM
.far: load >> L2SRAM
.fardata: load >> L2SRAM
.data: load >> L2SRAM
.switch: load >> L2SRAM
.stack: load > L2SRAM
.args: load > L2SRAM align = 0x4, fill = 0 {_argsize = 0x200; }
.sysmem: load > L2SRAM
.cinit: load > L2SRAM
.const: load > L2SRAM START(const_start) SIZE(const_size)
.pinit: load > L2SRAM
.cio: load >> L2SRAM
xdc.meta: load >> L2SRAM, type = COPY
}
the result for my project is :
1,[TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Successful N = 1024 radix = 4 natC: 39123 optC: 7994
this is Successful. .
2,
[TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Failure max_pct_diff = +Inf N = 2048 radix = 2 natC: 94438 optC: 19047
[TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Failure max_pct_diff = 114846.093750 N = 4096 radix = 4 natC: 188643 optC: 37743
[TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Failure max_pct_diff = 421790.906250 N = 16384 radix = 4 natC: 884979 optC: 176548
these are failure.
you can see when N>=2048 the result is failure.I don't know why?
And then I change the link.cmd.
the new link.cmd is as follow:
-heap 0x8000
-stack 0xC000
MEMORY
{
L2SRAM (RWX) : org = 0x800000, len = 0x100000
MSMCSRAM (RWX) : org = 0xc000000, len = 0x400000
}
SECTIONS
{
.kernel: {
*.obj (.text:optimized) { SIZE(_kernel_size) }
}
.text: load >> MSMCSRAM
.text:touch: load >> MSMCSRAM
GROUP (NEAR_DP)
{
.neardata
.rodata
.bss
} load > MSMCSRAM
.far: load >> MSMCSRAM
.fardata: load >> MSMCSRAM
.data: load >> MSMCSRAM
.switch: load >> MSMCSRAM
.stack: load > MSMCSRAM
.args: load > MSMCSRAM align = 0x4, fill = 0 {_argsize = 0x200; }
.sysmem: load > MSMCSRAM
.cinit: load > MSMCSRAM
.const: load > MSMCSRAM START(const_start) SIZE(const_size)
.pinit: load > MSMCSRAM
.cio: load >> MSMCSRAM
xdc.meta: load >> MSMCSRAM type = COPY
}
what I do is to map the project from L2 to MSMCSRAM.
the result is :
[TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Successful N = 1024 radix = 4 natC: 39123 optC: 8002
[TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Failure max_pct_diff = +Inf N = 2048 radix = 2 natC: 94438 optC: 19055
/* [TMS320C66x_0] Invalid CIO command (0) in the CIO buffer at address (0xc0438e8) was not recognized. Please check the device and program memory maps. [TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Failure max_pct_diff = 50686.066406 N = 4096 radix = 4 natC: 188643 optC: 1818453320 */ you can see when N=2048 ,the result is failure. and when N=4096,there is a error. I want to know why? so I change my link.cmd again.
my new link.cmd is as follow:
-heap 0x8000
-stack 0xC000
MEMORY
{
L2SRAM (RWX) : org = 0x800000, len = 0x100000
MSMCSRAM (RWX) : org = 0xc000000, len = 0x400000
}
SECTIONS
{
.kernel: {
*.obj (.text:optimized) { SIZE(_kernel_size) }
}
.text: load >> MSMCSRAM
.text:touch: load >> MSMCSRAM
GROUP (NEAR_DP)
{
.neardata
.rodata
.bss
} load > MSMCSRAM
.far: load >> MSMCSRAM
.fardata: load >> MSMCSRAM
.data: load >> MSMCSRAM
.switch: load >> MSMCSRAM
.stack: load > MSMCSRAM
.args: load > MSMCSRAM align = 0x4, fill = 0 {_argsize = 0x200; }
.sysmem: load > MSMCSRAM
.cinit: load > MSMCSRAM
.const: load > MSMCSRAM START(const_start) SIZE(const_size)
.pinit: load > MSMCSRAM
.cio: load >> L2SRAM
xdc.meta: load >> MSMCSRAM type = COPY
}
In this cmd file I only change the .cio.
and then my result change: [TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Successful N = 2048 radix = 2 natC: 94438 optC: 19055 [TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Successful N = 4096 radix = 4 natC: 188643 optC: 37751[TMS320C66x_0] DSPF_sp_fftSPxSP Iter#: 1 Result Successful N = 8192 radix = 2 natC: 442614 optC: 88484 they are all right.I want to know why ?can I change link.cmd like this?will it result another problem?
Thanks in advance!
