text: #include <stdio.h>
  #include <stdlib.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <unistd.h>
  #include <sys/mman.h>
  #include <error.h>
  #include <errno.h>
  
  #include "NE10.h"
  
  /* customize these macros and variables for a particular implementation */
  #define FFT_IN_ROUNDS	(1)
  #define FFT_CALC_POINTS	(256)
  #define FFT_CALC_ROUNDS	(1)
  #define FFT_POINTS	(FFT_CALC_POINTS * FFT_CALC_ROUNDS)
  #define IN_SAMPLE_TYPE	ne10_fft_cpx_int16_t
  #define OUT_SAMPLE_TYPE	ne10_fft_cpx_int32_t
  
  const char *g_test = "stream_fpga_256x1x1";
  const char *g_description = "256x1x1 point FFT, FPGA, 16-bit input 24/32-bit output";
  
  /* these functions and variables are implemented in overhead.c as a library */
  extern void initialize_everything(int argc, char **argv);
  extern uint64_t get_gt_value(void);
  extern void release_everything(void);
  extern void print_results(void);
  
  extern char *g_input_filename;
  extern char *g_output_filename;
  extern uint64_t g_start_time;
  extern uint64_t g_end_time;
  
  int main(int argc, char **argv)
  {
  	int input_fd;
  	int output_fd;
  	int fft256stream_dev_fd;
  	int result;
  	IN_SAMPLE_TYPE *in_buf;
  	OUT_SAMPLE_TYPE *out_buf;
  	int j;
  	
  	initialize_everything(argc, argv);
  	
  	/* allocate storage for input, output and config buffers */
  	in_buf = (IN_SAMPLE_TYPE*) NE10_MALLOC (FFT_CALC_POINTS * sizeof(IN_SAMPLE_TYPE));
  	if(in_buf == NULL)
  		error(1, errno, "in_buf allocation");
  		
  	out_buf = (OUT_SAMPLE_TYPE*) NE10_MALLOC (FFT_POINTS * sizeof(OUT_SAMPLE_TYPE));
  	if(out_buf == NULL)
  		error(1, errno, "out_buf allocation");
  		
  	/* open the input and output files and fft dev */
  	input_fd = open(g_input_filename, O_RDONLY);
  	if(input_fd < 0)
  		error(1, errno, "opening input file '%s'", g_input_filename);
  	
  	output_fd = open(g_output_filename, O_WRONLY | O_CREAT, ~((mode_t)umask));
  	if(output_fd < 0)
  		error(1, errno, "opening output file '%s'", g_output_filename);
  
  	fft256stream_dev_fd = open("/dev/fft256stream", O_RDWR);
  	if(fft256stream_dev_fd < 0)
  		error(1, errno, "opening fft256stream_dev_fd");
  
  	/* read the input data */
  	result = read(input_fd, in_buf, FFT_CALC_POINTS * sizeof(IN_SAMPLE_TYPE));
  	if(result < 0)
  		error(1, errno, "read input file");
  	if(result != (FFT_CALC_POINTS * sizeof(IN_SAMPLE_TYPE)))
  		error(1, 0, "input data size, expected %d but got %d", FFT_CALC_POINTS * sizeof(IN_SAMPLE_TYPE), result);
  	
  	/* write the waveform buffer */
  	result = write(fft256stream_dev_fd, in_buf, FFT_CALC_POINTS * sizeof(IN_SAMPLE_TYPE));
  	if(result < 0)
  		error(1, errno, "write waveform buffer");
  	if(result != (FFT_CALC_POINTS * sizeof(IN_SAMPLE_TYPE)))
  		error(1, 0, "output data size, expected %d but got %d", FFT_CALC_POINTS * sizeof(IN_SAMPLE_TYPE), result);
  	
  	/* capture the start value of the GT */
  	g_start_time = get_gt_value();
  	
  	for(j = 0 ; j < FFT_IN_ROUNDS ; j++) {
  		/* fetch the preprocessed stream from the FPGA, 16 bit input 24/32 bit output */
  		result = read(fft256stream_dev_fd, out_buf, FFT_POINTS * sizeof(OUT_SAMPLE_TYPE));
  		if(result < 0)
  			error(1, errno, "read from fft256stream_dev_fd");
  		if (result != (int)(FFT_POINTS * sizeof(OUT_SAMPLE_TYPE)))
  			error(1, 0, "fft256stream_dev_fd output data size, expected %d but got %d", FFT_POINTS * sizeof(OUT_SAMPLE_TYPE), result);
  	
  		/* write the output data */
  		result = write(output_fd, out_buf, FFT_POINTS * sizeof(OUT_SAMPLE_TYPE));
  		if(result < 0)
  			error(1, errno, "write output file");
  		if(result != (FFT_POINTS * sizeof(OUT_SAMPLE_TYPE)))
  			error(1, 0, "output data size, expected %d but got %d", FFT_POINTS * sizeof(OUT_SAMPLE_TYPE), result);
  	}
  	
  	/* capture the end value of the GT */
  	g_end_time = get_gt_value();
  
  	/* close the input and output files and fft dev */
  	close(fft256stream_dev_fd);
  	close(output_fd);
  	close(input_fd);
  
  	/* free storage for input, output and config buffers */
  	NE10_FREE (out_buf);
  	NE10_FREE (in_buf);
  	
  	print_results();
  	release_everything();
  	return 0;
  }
  
  