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-rw-r--r--controller/fw/src/dsss_demod.c28
-rw-r--r--controller/fw/src/dsss_demod.h17
-rw-r--r--controller/fw/src/simulation.h2
3 files changed, 25 insertions, 22 deletions
diff --git a/controller/fw/src/dsss_demod.c b/controller/fw/src/dsss_demod.c
index f9efda6..58dae9a 100644
--- a/controller/fw/src/dsss_demod.c
+++ b/controller/fw/src/dsss_demod.c
@@ -13,23 +13,23 @@
#include "simulation.h"
#include "generated/dsss_gold_code.h"
-#include "generated/dsss_butter_filter.h"
+// #include "generated/dsss_butter_filter.h"
/* Generated CWT wavelet LUT */
extern const float * const dsss_cwt_wavelet_table;
-struct iir_biquad cwt_filter_bq[DSSS_FILTER_CLEN] = {DSSS_FILTER_COEFF};
+//struct iir_biquad cwt_filter_bq[DSSS_FILTER_CLEN] = {DSSS_FILTER_COEFF};
void debug_print_vector(const char *name, size_t len, const float *data, size_t stride, bool index, bool debug);
static float gold_correlate_step(const size_t ncode, const float a[DSSS_CORRELATION_LENGTH], size_t offx, bool debug);
static float cwt_convolve_step(const float v[DSSS_WAVELET_LUT_SIZE], size_t offx);
-static float run_iir(const float x, const int order, const struct iir_biquad q[order], struct iir_biquad_state st[order]);
-static float run_biquad(float x, const struct iir_biquad *const q, struct iir_biquad_state *const restrict st);
+//static float run_iir(const float x, const int order, const struct iir_biquad q[order], struct iir_biquad_state st[order]);
+//static float run_biquad(float x, const struct iir_biquad *const q, struct iir_biquad_state *const restrict st);
static void matcher_init(struct matcher_state states[static DSSS_MATCHER_CACHE_SIZE]);
static void matcher_tick(struct matcher_state states[static DSSS_MATCHER_CACHE_SIZE],
uint64_t ts, int peak_ch, float peak_ampl);
static void group_received(struct dsss_demod_state *st);
-static uint8_t decode_peak(int peak_ch, float peak_ampl);
+static symbol_t decode_peak(int peak_ch, float peak_ampl);
#ifdef SIMULATION
void debug_print_vector(const char *name, size_t len, const float *data, size_t stride, bool index, bool debug) {
@@ -61,7 +61,7 @@ void dsss_demod_init(struct dsss_demod_state *st) {
void dsss_demod_step(struct dsss_demod_state *st, float new_value, uint64_t ts) {
//const float hole_patching_threshold = 0.01 * DSSS_CORRELATION_LENGTH;
bool log = false;
- bool log_groups = true;
+ bool log_groups = false;
st->signal[st->signal_wpos] = new_value;
st->signal_wpos = (st->signal_wpos + 1) % ARRAY_LENGTH(st->signal);
@@ -99,7 +99,7 @@ void dsss_demod_step(struct dsss_demod_state *st, float new_value, uint64_t ts)
max_ts = ts;
}
- if (fabsf(val) > DSSS_THESHOLD_FACTOR)
+ if (fabsf(val) > DSSS_THRESHOLD_FACTOR)
found = true;
}
if (log) DEBUG_PRINTN("%f %d ", max_val, found);
@@ -134,12 +134,12 @@ void dsss_demod_step(struct dsss_demod_state *st, float new_value, uint64_t ts)
/* Map a sequence match to a data symbol. This maps the sequence's index number to the 2nd to n+2nd bit of the result,
* and maps the polarity of detection to the LSb. 5-bit example:
*
- * [0, S, S, S, S, S, S, P] ; S ^= symbol index (0 - 2^n+1), P ^= symbol polarity
+ * [0, S, S, S, S, S, S, P] ; S ^= symbol index (0 - 2^n+1 so we need just about n+1 bit), P ^= symbol polarity
*
* Symbol polarity is preserved from transmitter to receiver. The symbol index is n+1 bit instead of n bit since we have
* 2^n+1 symbols to express, one too many for an n-bit index.
*/
-uint8_t decode_peak(int peak_ch, float peak_ampl) {
+symbol_t decode_peak(int peak_ch, float peak_ampl) {
return (peak_ch<<1) | (peak_ampl > 0);
}
@@ -157,7 +157,7 @@ void matcher_tick(struct matcher_state states[static DSSS_MATCHER_CACHE_SIZE], u
const float score_depreciation = 0.1f; /* 0.0 -> no depreciation, 1.0 -> complete disregard */
const int current_phase = ts % DSSS_CORRELATION_LENGTH;
const int max_skips = TRANSMISSION_SYMBOLS/4*3;
- bool debug = true;
+ bool debug = false;
bool header_printed = false;
for (size_t i=0; i<DSSS_MATCHER_CACHE_SIZE; i++) {
@@ -172,7 +172,7 @@ void matcher_tick(struct matcher_state states[static DSSS_MATCHER_CACHE_SIZE], u
header_printed = true;
DEBUG_PRINTN("windows %zu\n", ts);
}
- if (debug) DEBUG_PRINTN(" skip %d old=%f new=%f\n", i, states[i].candidate_score, score);
+ if (debug) DEBUG_PRINTN(" skip %zd old=%f new=%f\n", i, states[i].candidate_score, score);
/* We win, update candidate */
assert(i < DSSS_MATCHER_CACHE_SIZE);
states[i].candidate_score = score;
@@ -195,7 +195,7 @@ void matcher_tick(struct matcher_state states[static DSSS_MATCHER_CACHE_SIZE], u
header_printed = true;
DEBUG_PRINTN("windows %zu\n", ts);
}
- if (debug) DEBUG_PRINTN(" %d ", i);
+ if (debug) DEBUG_PRINTN(" %zd ", i);
/* Process window results */
assert(i < DSSS_MATCHER_CACHE_SIZE);
assert(0 <= states[i].data_pos && states[i].data_pos < TRANSMISSION_SYMBOLS);
@@ -235,7 +235,7 @@ static float score_group(const struct group *g, int phase_delta) {
}
void group_received(struct dsss_demod_state *st) {
- bool debug = true;
+ bool debug = false;
const int group_phase = st->group.max_ts % DSSS_CORRELATION_LENGTH;
/* This is the score of a decoding starting at this group (with no context) */
float base_score = score_group(&st->group, 0);
@@ -305,6 +305,7 @@ void group_received(struct dsss_demod_state *st) {
}
}
+#if 0
float run_iir(const float x, const int order, const struct iir_biquad q[order], struct iir_biquad_state st[order]) {
float intermediate = x;
for (int i=0; i<(order+1)/2; i++)
@@ -320,6 +321,7 @@ float run_biquad(float x, const struct iir_biquad *const q, struct iir_biquad_st
st->reg[0] = intermediate;
return out;
}
+#endif
float cwt_convolve_step(const float v[DSSS_WAVELET_LUT_SIZE], size_t offx) {
float sum = 0.0f;
diff --git a/controller/fw/src/dsss_demod.h b/controller/fw/src/dsss_demod.h
index 448abb4..b865d83 100644
--- a/controller/fw/src/dsss_demod.h
+++ b/controller/fw/src/dsss_demod.h
@@ -10,8 +10,12 @@
/* FIXME: move to makefile */
#define DSSS_MATCHER_CACHE_SIZE 8
-/* FIXME: move to more appropriate header */
-#define PAYLOAD_DATA_BYTE ((PAYLOAD_DATA_BIT+7)/8)
+
+#if DSSS_GOLD_CODE_NBITS < 8
+typedef uint8_t symbol_t;
+#else
+typedef uint16_t symbol_t;
+#endif
struct iir_biquad {
float a[2];
@@ -43,12 +47,9 @@ struct matcher_state {
int last_skips;
int candidate_skips;
-#if DSSS_GOLD_CODE_NBITS > 7
-#error DSSS_GOLD_CODE_NBITS is too large for matcher_state.data data type (uint8_t)
-#endif
- uint8_t data[TRANSMISSION_SYMBOLS];
+ symbol_t data[TRANSMISSION_SYMBOLS];
int data_pos;
- uint8_t candidate_data;
+ symbol_t candidate_data;
};
struct dsss_demod_state {
@@ -66,7 +67,7 @@ struct dsss_demod_state {
};
-extern void handle_dsss_received(uint8_t data[static TRANSMISSION_SYMBOLS]);
+extern void handle_dsss_received(symbol_t data[static TRANSMISSION_SYMBOLS]);
void dsss_demod_init(struct dsss_demod_state *st);
void dsss_demod_step(struct dsss_demod_state *st, float new_value, uint64_t ts);
diff --git a/controller/fw/src/simulation.h b/controller/fw/src/simulation.h
index e813de7..2734e5b 100644
--- a/controller/fw/src/simulation.h
+++ b/controller/fw/src/simulation.h
@@ -3,7 +3,7 @@
#ifdef SIMULATION
#include <stdio.h>
-#define DEBUG_PRINTN(...) fprintf(stderr, __VA_ARGS__)
+#define DEBUG_PRINTN(...) printf(__VA_ARGS__)
#define DEBUG_PRINTNF(fmt, ...) DEBUG_PRINTN("%s:%d: " fmt, __FILE__, __LINE__, ##__VA_ARGS__)
#define DEBUG_PRINT(fmt, ...) DEBUG_PRINTNF(fmt "\n", ##__VA_ARGS__)
#else
generated by cgit (git 2.34.1) at 2024-09-22 06:38:34 +0000