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Finish DSSS demodulation stage 1

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This commit is contained in:
jaseg 2020-03-06 12:39:21 +01:00
parent e4693349cf
commit 55ebbcbdbc
5 changed files with 167 additions and 58 deletions
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25
controller/fw/tools/dsss_demod_test.c
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@ -13,11 +13,11 @@
#include "dsss_demod.h"
void print_usage() {
fprintf(stderr, "Usage: dsss_demod_test [test_data.bin]\n");
fprintf(stderr, "Usage: dsss_demod_test [test_data.bin] [optional recording channel number]\n");
}
int main(int argc, char **argv) {
if (argc != 2) {
if (argc != 2 && argc != 3) {
fprintf(stderr, "Error: Invalid arguments.\n");
print_usage();
return 1;
@ -46,7 +46,18 @@ int main(int argc, char **argv) {
return 2;
}
fprintf(stderr, "Reading %zd samples test data...", st.st_size/sizeof(float));
int record_channel = -1;
if (argc == 3) {
char *endptr;
record_channel = strtoul(argv[2], &endptr, 10);
if (!endptr || *endptr != '\0') {
fprintf(stderr, "Invalid channel number \"%s\"\n", argv[2]);
return 1;
}
}
if (record_channel != -1)
fprintf(stderr, "Reading %zd samples test data...", st.st_size/sizeof(float));
size_t nread = 0;
while (nread < st.st_size) {
ssize_t rc = read(fd, buf, st.st_size - nread);
@ -66,18 +77,20 @@ int main(int argc, char **argv) {
nread += rc;
}
fprintf(stderr, " done.\n");
if (record_channel != -1)
fprintf(stderr, " done.\n");
const size_t n_samples = st.st_size / sizeof(float);
float *buf_f = (float *)buf;
fprintf(stderr, "Starting simulation.\n");
if (record_channel != -1)
fprintf(stderr, "Starting simulation.\n");
struct dsss_demod_state demod;
memset(&demod, 0, sizeof(demod));
for (size_t i=0; i<n_samples; i++) {
//fprintf(stderr, "Iteration %zd/%zd\n", i, n_samples);
dsss_demod_step(&demod, buf_f[i], i);
dsss_demod_step(&demod, buf_f[i], i, record_channel);
}
return 0;