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lmx
2025-10-29 13:10:02 +08:00
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cpu/br28/audio_demo/audio_fft_demo.c Normal file
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/*
****************************************************************************
* Audio FFT Demo
*
*Description : Audio FFT使用范例
*Notes :
*(1)本demo为开发测试范例，请不要修改该demo， 如有需求，请自行复制再修改
*(2)FFT输入数据位宽
*----------------------------------------------------------------------
* FFT模式 FFT点数 最大输入位宽
*----------------------------------------------------------------------
* 复数 64 [21:0]
* 128 [20:0]
* 256 [19:0]
* 512 [18:0]
* 1024 [17:0]
*----------------------------------------------------------------------
* 实数 64 [20:0]
* 128 [18:0]
* 256 [17:0]
* 512 [18:0]
* 1024 [16:0]
*----------------------------------------------------------------------
*(3)IFFT输入位宽：[29:0]
****************************************************************************
*/
#include "audio_demo.h"
#include "hw_fft.h"
// For 128 point Real_FFT test
void hw_fft_demo_real()
{
int tmpbuf[130]; // 130 = (128/2+1)*2
unsigned int fft_config;
printf("********* test start **************\n");
for (int i = 0; i < 128; i++) {
tmpbuf[i] = i + 1;
printf("tmpbuf[%d]: %d \n", i, tmpbuf[i]);
}
// Do 128 point FFT
fft_config = hw_fft_config(128, 7, 1, 0, 1);
hw_fft_run(fft_config, tmpbuf, tmpbuf);
for (int i = 0; i < 130; i++) {
printf("tmpbuf_[%d]: %d \n", i, tmpbuf[i]);
}
// Do 128 point IFFT
fft_config = hw_fft_config(128, 7, 1, 1, 1);
hw_fft_run(fft_config, tmpbuf, tmpbuf);
for (int i = 0; i < 128; i++) {
printf("tmpbuf_[%d]: %d \n", i, tmpbuf[i]);
}
}
// For 128 point Complex_FFT test
void hw_fft_demo_complex()
{
int tmpbuf[280]; // 280 = (128/2+1)*2*2
unsigned int fft_config;
printf("********* test start **************\n");
for (int i = 0; i < 128; i++) {
tmpbuf[2 * i] = i + 1;
tmpbuf[2 * i + 1] = i + 1;
printf("tmpbuf[%d]: %d \n", 2 * i, tmpbuf[2 * i]);
printf("tmpbuf[%d]: %d \n", 2 * i + 1, tmpbuf[2 * i + 1]);
}
// Do 128 point FFT
fft_config = hw_fft_config(128, 7, 1, 0, 0);
hw_fft_run(fft_config, tmpbuf, tmpbuf);
for (int i = 0; i < 128; i++) {
printf("tmpbuf[%d]: %d \n", 2 * i, tmpbuf[2 * i]);
printf("tmpbuf[%d]: %d \n", 2 * i + 1, tmpbuf[2 * i + 1]);
}
// Do 128 point IFFT
fft_config = hw_fft_config(128, 7, 1, 1, 0);
hw_fft_run(fft_config, tmpbuf, tmpbuf);
for (int i = 0; i < 128; i++) {
printf("tmpbuf[%d]: %d \n", 2 * i, tmpbuf[2 * i]);
printf("tmpbuf[%d]: %d \n", 2 * i + 1, tmpbuf[2 * i + 1]);
}
}