Optimize FFT test input generation

sdk/software/examples/fft/main.c

@@ -5,6 +5,7 @@
 #include <common_func.h>
 #include <confreg_time.h>
 #include <fft.h>
+#include "../fft_test_data.h"
 
 // BSP板级支持包所需全局变量
 unsigned long UART_BASE = 0xbf000000;
@@ -80,12 +81,7 @@ int main(int argc, char** argv)
     float sw_in_im[FFT_POINT_NUM];
 
     for (int i = 0; i < FFT_POINT_NUM; i++) {
-        float dc_part   = 4000.0f;
-        float f10_part  = 8000.0f * cos(2 * PI * 10.0 * i / FFT_POINT_NUM);
-        float f200_part = 6000.0f * sin(2 * PI * 200.0 * i / FFT_POINT_NUM);
-        float f400_part = 3000.0f * sin(2 * PI * 400.0 * i / FFT_POINT_NUM);
-        
-        sw_in_re[i] = dc_part + f10_part + f200_part + f400_part;
+        sw_in_re[i] = (float)fft_test_sample((unsigned int)i);
         sw_in_im[i] = 0.0f;
     }
 
@@ -153,4 +149,4 @@ int main(int argc, char** argv)
     }
 
     return 0;
-}
+}