109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
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#include <stdint.h>
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#include <math.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/fcntl.h>
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#include "dsss_demod.h"
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void handle_dsss_received(symbol_t data[static TRANSMISSION_SYMBOLS]) {
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printf("data sequence received: [ ");
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for (size_t i=0; i<TRANSMISSION_SYMBOLS; i++) {
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//printf("%+3d", ((data[i]&1) ? 1 : -1) * (data[i]>>1));
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printf("%2d", data[i]);
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if (i+1 < TRANSMISSION_SYMBOLS)
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printf(", ");
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}
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printf(" ]\n");
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}
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void print_usage() {
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fprintf(stderr, "Usage: dsss_demod_test [test_data.bin] [optional recording channel number]\n");
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}
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int main(int argc, char **argv) {
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if (argc != 2 && argc != 3) {
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fprintf(stderr, "Error: Invalid arguments.\n");
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print_usage();
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return 1;
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}
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int fd = open(argv[1], O_RDONLY);
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struct stat st;
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if (fstat(fd, &st)) {
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fprintf(stderr, "Error querying test data file size: %s\n", strerror(errno));
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return 2;
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}
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if (st.st_size < 0 || st.st_size > 10000000) {
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fprintf(stderr, "Error reading test data: too much test data (size=%zd)\n", st.st_size);
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return 2;
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}
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if (st.st_size % sizeof(float) != 0) {
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fprintf(stderr, "Error reading test data: file size is not divisible by %zd (size=%zd)\n", sizeof(float), st.st_size);
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return 2;
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}
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char *buf = malloc(st.st_size);
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if (!buf) {
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fprintf(stderr, "Error allocating memory");
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return 2;
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}
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int record_channel = -1;
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if (argc == 3) {
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char *endptr;
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record_channel = strtoul(argv[2], &endptr, 10);
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if (!endptr || *endptr != '\0') {
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fprintf(stderr, "Invalid channel number \"%s\"\n", argv[2]);
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return 1;
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}
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}
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if (record_channel != -1)
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fprintf(stderr, "Reading %zd samples test data...", st.st_size/sizeof(float));
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ssize_t nread = 0;
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while (nread < st.st_size) {
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ssize_t rc = read(fd, buf + nread, st.st_size - nread);
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if (rc == -EINTR || rc == -EAGAIN)
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continue;
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if (rc < 0) {
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fprintf(stderr, "\nError reading test data: %s\n", strerror(errno));
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return 2;
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}
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if (rc == 0) {
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fprintf(stderr, "\nError reading test data: Unexpected end of file\n");
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return 2;
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}
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nread += rc;
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}
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if (record_channel != -1)
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fprintf(stderr, " done.\n");
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const size_t n_samples = st.st_size / sizeof(float);
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float *buf_f = (float *)buf;
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if (record_channel != -1)
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fprintf(stderr, "Starting simulation.\n");
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struct dsss_demod_state demod;
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dsss_demod_init(&demod);
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for (size_t i=0; i<n_samples; i++) {
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//fprintf(stderr, "Iteration %zd/%zd\n", i, n_samples);
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dsss_demod_step(&demod, buf_f[i], i);
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}
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free(buf);
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return 0;
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}
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