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#include <stdint.h>
#include <math.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include "freq_meas.h"
void print_usage(void);
void print_usage() {
fprintf(stderr, "Usage: freq_meas_test [test_data.bin]\n");
}
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Error: Invalid arguments.\n");
print_usage();
return 1;
}
int fd = open(argv[1], O_RDONLY);
struct stat st;
if (fstat(fd, &st)) {
fprintf(stderr, "Error querying test data file size: %s\n", strerror(errno));
return 2;
}
if (st.st_size < 0 || st.st_size > 1000000) {
fprintf(stderr, "Error reading test data: too much test data (size=%zd)\n", st.st_size);
return 2;
}
if (st.st_size % sizeof(float) != 0) {
fprintf(stderr, "Error reading test data: file size is not divisible by %zd (size=%zd)\n", sizeof(float), st.st_size);
return 2;
}
char *buf = malloc(st.st_size);
if (!buf) {
fprintf(stderr, "Error allocating memory");
return 2;
}
fprintf(stderr, "Reading %zd samples test data...", st.st_size/sizeof(float));
ssize_t nread = 0;
while (nread < st.st_size) {
ssize_t rc = read(fd, buf + nread, st.st_size - nread);
if (rc == -EINTR || rc == -EAGAIN)
continue;
if (rc < 0) {
fprintf(stderr, "\nError reading test data: %s\n", strerror(errno));
return 2;
}
if (rc == 0) {
fprintf(stderr, "\nError reading test data: Unexpected end of file\n");
return 2;
}
nread += rc;
}
fprintf(stderr, " done.\n");
const size_t n_samples = st.st_size / sizeof(float);
float *buf_f = (float *)buf;
int16_t *sim_adc_buf = calloc(sizeof(int16_t), n_samples);
if (!sim_adc_buf) {
fprintf(stderr, "Error allocating memory\n");
return 2;
}
fprintf(stderr, "Converting and truncating test data...");
for (size_t i=0; i<n_samples; i++)
/* Note on scaling: We can't simply scale by 0x8000 (1/2 full range) here. Our test data is nominally 1Vp-p but
* certain tests such as the interharmonics one can have some samples exceeding that range. */
sim_adc_buf[i] = buf_f[i] * (0x4000-1);
fprintf(stderr, " done.\n");
fprintf(stderr, "Starting simulation.\n");
size_t iterations = (n_samples-FMEAS_FFT_LEN)/(FMEAS_FFT_LEN/2);
for (size_t i=0; i<iterations; i++) {
fprintf(stderr, "Iteration %zd/%zd\n", i, iterations);
float res = NAN;
int rc = adc_buf_measure_freq(sim_adc_buf + i*(FMEAS_FFT_LEN/2), &res);
if (rc)
printf("ERROR: Simulation error in iteration %zd at position %zd: %d\n", i, i*(FMEAS_FFT_LEN/2), rc);
printf("%09zd %12f\n", i, res);
}
free(buf);
free(sim_adc_buf);
return 0;
}
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