dsPIC33EP上的FFT永远不会工作

你好！我开发了一个基于微芯片DSP库的DSPIC33 FJ128GP802的“信号分析器”，然后在图形模式下在ILI934 1显示中显示一个代码，代码工作得很好，最大FFT大小为1024个点（由于RAM限制）。N和频域同时没有问题，但是由于DSPIC33 EP512GP502的30个额外MIPS（和FLAS/RAM功能），我决定迁移代码没有成功，所有的例程都工作得很好，但是FFT没有。第一个问题是内存映射，编译器没有。允许像“空间（y存储器）”这样的AbbbTues或类似的EP设备投掷一个错误“不能分配…”（我不知道为什么），所以我手动地址：这样做没有地址陷阱中断和代码流没有问题，但不计算FFT使用相同的代码工作。DSPIC33 FJ类似：“SealAlxInDaDA”包含由time3 ADC采样的数据，在48 kHz触发，屏幕和调试总是显示17000赫兹，并且存储在FFT矢量的结果中的数据从未改变。有人知道为什么在FJ上同样的算法在EP中没有吗？我停止了发展，因为我不知道发生了什么。任何帮助都是非常有希望的。



      以下为原文

    Hello comunity!
I developed a "signal analyzer" on a dsPIC33FJ128GP802 based on Microchip dsp libraries for the spectrum, then I write a code for show data in a ILI9341 display in a graphical mode and the code works very well with a maximum FFT size of 1024 points (due to RAM limitation) this code shows time domain and frequency domain without problems at the same time, but due to the 30 extra MIPS (and flash/ram capabilities) of the dsPIC33EP512GP502, I decided to migrate the code without success, all the routines works very well but the FFT not.

The first issue was the memory mapping, the compiler does not allow atribbutes like "space(ymemory)" or similar for EP devices throwing an error "could not allocate..." (I dont know why) so I address manually like :

fractcomplex vector_complejo[Muestras_FFT] __attribute__((address(0x9000),far,aligned(Muestras_FFT*2*2)));
fractcomplex twiddleFactors[Muestras_FFT/2] __attribute__((address(0x1000),near,aligned(Muestras_FFT*2)));

Doing this there are not address trap interrupts and the code flows without problems but NOT calculate the FFT using the same code that works on dsPIC33FJ like:
p_real = &vector_complejo[0].real ; //Inicializa puntero
p_complejo = &vector_complejo[0]; //Inicializa puntero
//===================SE MUEVE EL BUFFER DE ENTRADA AL VECTOR COMPLEJO===========
for ( i = 0; i < Muestras_FFT; i++ )
{
vector_complejo.real = Senal_Entrada ;
vector_complejo.imag = 0 ;
}
//==========================CALCULO DE LA FFT===========
FFTComplexIP (E_Mariposa, &vector_complejo[0], (fractcomplex *)&twiddleFactors[0],COEFFS_IN_DATA);
BitReverseComplex (E_Mariposa, &vector_complejo[0]);
SquareMagnitudeCplx(Muestras_FFT, &vector_complejo[0], &vector_complejo[0].real);
"Senal_Entrada" contains the data sampled by timer3 ADC triggering at 48KHz, the screen and the debug always show 17000 Hz and the data stored in the result of the FFT vector never changes. Anyone have an idea why the same algorithm that works on FJ doesn't in EP? I stopped the develoment because I dont know what is happening. Any help will be very hopefull.