383 lines
17 KiB
C
383 lines
17 KiB
C
#include "include/signal_path.h"
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#define BLOCK_LEN 1
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//Globale Variable setzen
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static int counter=0;
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static int mu;
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static int leak=2147462173; //0.999 // (1 ? <20>?)
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// Int Arrays für Delay Line (Acc-Sensor Samples) sowie Filterkoeffizienten anlegen
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int chess_storage(DMB) sample_line[MAX_FIR_COEFFS];
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int chess_storage(DMA % (sizeof(long long))) coefficient_line[MAX_FIR_COEFFS];
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// Structs für Pointerinkrementierung auf Delay Line- und Koeffizieten-Arrays anlegen
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BufferPtrDMB chess_storage(DMB) pointer_sample_line;
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BufferPtr pointer_coefficient_line;
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#ifdef PLATFORM_GENERIC
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// lpdsp32 functionallity moddeling functions
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accum_t fract_mult(int a, int b){
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long int a_long = a;
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long int b_long = b;
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return (b_long * a_long);
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}
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accum_t to_accum(int a){
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long int a_long = (long int) a;
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return a_long << 31;
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}
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int rnd_saturate(accum_t a){
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return a >> 31;
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}
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int extract_high(accum_t a){
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return a >> 31;
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}
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void lldecompose(unsigned long long l, int* int1, int* int2){
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*int2 = (int)(l >> 32);
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*int1 = (int)(l);
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}
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uint64_t llcompose(int a, int b) {
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uint64_t result = (uint64_t)b; // Assign b to the higher 32 bits of the result
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result <<= 32; // Shift the higher 32 bits to the left
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result |= (uint32_t)a; // Bitwise OR operation with the lower 32 bits of a
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return result;
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}
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// unsigned long long llcompose(int a, int b){
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// unsigned long long l;
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// l = a << 32;
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// l |= b;
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// return l;
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//}
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int* cyclic_add(int *ptr, int i_pp, int *ptr_start, int buffer_len){
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int *p_ptr=ptr;
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for (int i=0; i < abs(i_pp); i+=1){ // end of buffer wraparound
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if (i_pp > 0){
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p_ptr ++;
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if (p_ptr >= ptr_start + buffer_len){
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p_ptr=ptr_start;
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}
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}
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else{ // start of buffer wraparound
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p_ptr--;
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if (p_ptr < ptr_start){
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p_ptr=ptr_start + (buffer_len -1);
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}
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}
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}
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return p_ptr;
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}
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#endif
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//Allgemeinen Buffer um bestimmten Eingabewert inkrementieren - nicht in Verwendung
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/* void increment_buffer(BufferPtr *buffer, int i_incr){
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buffer->ptr_current = cyclic_add(buffer->ptr_current, i_incr, buffer->ptr_start, buffer->buffer_len);
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}
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*/
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//DMB-Buffer um bestimmten Eingabewert inkrementieren - nicht in Verwendung
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/* void increment_buffert_DMB(BufferPtrDMB *buffer, int i_incr){
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buffer->ptr_current = cyclic_add(buffer->ptr_current, i_incr, buffer->ptr_start, buffer->buffer_len);
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} */
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//Übergabeblock in allgemeinen Buffer schreiben und Buffer inkrementieren - nicht in Verwendung
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//void static inline write_buffer_block(BufferPtr *buffer, int* block){
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// for (int i=0; i<BLOCK_LEN; i+=2){
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// buffer->ptr_current[0] = block[i]; // TODO: use llcompose
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// buffer->ptr_current[1] = block[i+1];
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// buffer->ptr_current = cyclic_add(buffer->ptr_current, 2, buffer->ptr_start, buffer->buffer_len);
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// }
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//}
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//Nicht verwendet
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/* int sig_calc_biquad(SingleSignalPath *signal, int x) {
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if (signal->preemph_activated == 0) {
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return x;
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}
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accum_t sum =
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fract_mult(x, signal->b_preemph[0]) + fract_mult(signal->_xd[0], signal->b_preemph[1]) +
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fract_mult(signal->_xd[1], signal->b_preemph[2]) + fract_mult(signal->_yd[0], signal->b_preemph[3]) +
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fract_mult(signal->_yd[1],signal->b_preemph[4]);
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int y = rnd_saturate(sum << 1);
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signal->_xd[1] = signal->_xd[0];
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signal->_xd[0] = x;
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signal->_yd[1] = signal->_yd[0];
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signal->_yd[0] = y;
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return y;
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} */
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//Nicht verwendet
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/* int inline sig_get_delayed_sample(SingleSignalPath *signal) {
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return *signal->delay_buffer.ptr_current;
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} */
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//Nicht verwendet
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/* int sig_delay_buffer_load_and_get(SingleSignalPath *signal, int x) {
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if (signal->delay_buffer.buffer_len == 0) {
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return x;
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}
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int out = *signal->delay_buffer.ptr_current;
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*signal->delay_buffer.ptr_current = x;
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increment_buffer(&signal->delay_buffer, 1);
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return out;
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} */
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//Nicht verwendet
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/* int sig_calc_weight(SingleSignalPath *signal, int x) {
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if (signal->weight_actived == 0) {
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return x;
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}
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accum_t acc = fract_mult(x, signal->weight);
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return rnd_saturate(acc);
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} */
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//Allgemeinen Buffer initialisieren
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int initialize_buffer(BufferPtr *buffer, int *buffer_start_add, int length, int max_buffer_len) {
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buffer->buffer_len = length;
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buffer->ptr_start = buffer_start_add;
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buffer->ptr_current = buffer_start_add;
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// initialize delay line with 0
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for (int i = 0; i < length; i++) {
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buffer_start_add[i] = 0;
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}
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if (length<max_buffer_len){
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return 0;
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}
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else{
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return 1;
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}
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}
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//DMB Buffer initialisieren
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int initialize_buffer_dmb(BufferPtrDMB chess_storage(DMB) *buffer, int chess_storage(DMB) *buffer_start_add, int length, int max_buffer_len){
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buffer->buffer_len = length;
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buffer->ptr_start = buffer_start_add;
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buffer->ptr_current = buffer_start_add;
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// initialize delay line with 0
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for (int i = 0; i < length; i++) {
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buffer_start_add[i] = 0;
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}
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if (length<max_buffer_len){
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return 0;
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}
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else{
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return 1;
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}
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}
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//Übergabesample in allgemeinen Buffer schreiben und Buffer inkrementieren - nicht in Verwendung
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void write_buffer(BufferPtr *buffer, int sample){
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*buffer->ptr_current = sample;
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buffer->ptr_current = cyclic_add(buffer->ptr_current, 1, buffer->ptr_start, buffer->buffer_len);
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}
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//Übergabesample in DMB Buffer schreiben (Sample-Line) und Buffer inkrementieren
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void write_buffer_dmb(BufferPtrDMB chess_storage(DMB) *buffer, int sample){
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*buffer->ptr_current = sample; //Sample des Acc-Sensors wird in Adresse geschrieben, auf die der Pointer zeigt
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buffer->ptr_current = cyclic_add(buffer->ptr_current, 1, buffer->ptr_start, buffer->buffer_len); //Pointer wird inkrementiert
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}
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//Initialisierungsfunktion für Biquad Filter Koeffizienten
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void scale_preemph_filter(SingleSignalPath *signal, double b0, double b1, double b2, double a1, double a2, int scale_bits) {
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// Wenn b0=1 und Rest 0 -> kein Filter weil effektiv 1*Xn
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if (b0 == 1. && b1 == 0. && b2 == 0. && a1 == 0. && a2 == 0.) {
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signal->preemph_activated = 0;
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}
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else{
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signal->preemph_activated = 1; // Schreibe Eintrag in Struct
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signal->_preemph_scale_nbits = scale_bits; // Schreibe Eintrag in Struct - wieviel Bits wird skaliert
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int scale = pow(2, scale_bits) - 1; //2^n -1 Skalierung
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// Skaliere Koeffizienten zu Interger und schreibe Eintrag in Struct
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signal->b_preemph[0] = b0 * scale;
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signal->b_preemph[1] = b1 * scale;
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signal->b_preemph[2] = b2 * scale;
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signal->b_preemph[3] = a1 * scale;
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signal->b_preemph[4] = a2 * scale;
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}
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}
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//Initialisierungsfunktion für Delay
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int set_delay(SingleSignalPath *signal, int n_delay) {
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return initialize_buffer(&signal->delay_buffer, signal->_delay_buffer, n_delay, MAX_DELAY_SAMPS);
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}
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//Initialisierungsfunktion für Gewichtung
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void set_weight(SingleSignalPath *signal, double weight, int scale_nbits) {
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// Wenn Gewichtung 1 -> kein Effekt
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if (weight == 1.) {
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signal->weight_actived = 0;
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}
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// Wenn Gewichtung != 1 -> Zu Integer skalieren und Eintrag in Struct schreiben
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else{
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signal->weight_actived = 1;
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int scale = pow(2, scale_nbits) - 1;
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signal->weight = weight * scale;
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signal->_weight_scale_nbits = scale_nbits;
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}
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}
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int inline apply_fir_filter(BufferPtrDMB chess_storage(DMB) *pointer_sample_line, BufferPtr *pointer_coefficient_line){
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// Filterkoeffizienten mit Acc-Sensor Samples multiplizieren und aufsummieren um Akkumulator Output des adaptiven Filters zu erhalten
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//Pointer für Koeffizienten und Sample-Line Samples anlegen
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int chess_storage(DMB) *p_x0 = pointer_sample_line->ptr_current;
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int chess_storage(DMB) *p_xstart = pointer_sample_line->ptr_start;
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int *p_w = pointer_coefficient_line->ptr_current;
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int sample_line_len = pointer_sample_line->buffer_len;
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int n_coeff = pointer_coefficient_line->buffer_len;
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//Variablen und Akkumulatoren (72-Bit) anlegen
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int x0, x1, w0, w1;
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accum_t acc_fir_1 = to_accum(0);
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accum_t acc_fir_2 = to_accum(0);
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accum_t acc_fir;
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// In 2er Schritten durch die Koeffizienten iterieren, immer 2 Samples und 2 Koeffizienten pro Schleifendurchlauf -> DUAL LOAD und DUAL MAC
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for (int i=0; i < n_coeff; i+=2) chess_loop_range(1,){
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x0 = *p_x0; //Sample 1 aus Sample-Line
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w0 = *p_w; //Koeffizient 1 aus Koeffizienten Array
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p_w++; //Koeffizienten-Pointer inkrementieren
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p_x0 = cyclic_add(p_x0, -1, p_xstart, sample_line_len); //Sample-Line-Pointer dekrementieren (rueckwaerts durch Delay Line)
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x1 = *p_x0; //Sample 2 aus Sample-Line
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w1 = *p_w; //Koeffizient 2 aus Koeffizienten Array
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p_w++; //Koeffizienten-Pointer inkrementieren
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p_x0 = cyclic_add(p_x0, -1, p_xstart, sample_line_len); //Sample-Line-Pointer dekrementieren (rueckwaerts durch Sample-Line)
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acc_fir_1+=fract_mult(x0, w0); //Akkumulator 1 mit Sample 1 * Koeffizient 1 addieren
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acc_fir_2+=fract_mult(x1, w1); //Akkumulator 2 mit Sample 2 * Koeffizient 2 addieren
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}
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// Akkumulatoren addieren um das Filterergebnis zu erhalten
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acc_fir = acc_fir_1 + acc_fir_2;
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return rnd_saturate(acc_fir);
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}
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void static inline update_filter_coefficients(BufferPtrDMB chess_storage(DMB) *pointer_sample_line, BufferPtr *pointer_coefficient_line, int output){
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int chess_storage(DMA) *p_w0 = pointer_coefficient_line->ptr_start; //Pointer auf Filterkoeffizienten-Array
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int chess_storage(DMB) *p_x0 = pointer_sample_line->ptr_current; //Current-Pointer 1 auf Sample-Line Array
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int chess_storage(DMB) *p_x1 = pointer_sample_line->ptr_current; //Current-Pointer 2 auf Sample-Line Array
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int chess_storage(DMB) *p_xstart = pointer_sample_line->ptr_start; //Start-Pointer auf Sample-Line Array
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int sample_line_len = pointer_sample_line->buffer_len; // Länge des Sample-Line Arrays
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int n_coeff = pointer_coefficient_line->buffer_len; // Anzahl der Filterkoeffizienten
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int correction, x0, x1, w0, w1;
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accum_t acc_w0, acc_w1, product;
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p_x1 = cyclic_add(p_x1, -1, pointer_sample_line->ptr_start, pointer_sample_line->buffer_len); //Current-Pointer 2 dekrementieren um 1
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product = fract_mult(mu, output); //FIR-Output mit mu multiplizieren -> Korrektursignal. aktuell noch im accum-Format
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correction = rnd_saturate(product); //Korrektursignal wieder ins 32-Bit Format
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for (int i=0; i< n_coeff; i+=2) chess_loop_range(1,){
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// Filterkoeffizienten vom 64 Bit Format am Ort wo der p_w0 Pointer hinzeigt in 2 32-Bit Werte zerlegen - 1 Cycle
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lldecompose(*((long long *)p_w0), w0, w1);
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// Filter Koeffizienten in Accum-Format bringen (oberste 32 Bit, Rest Nullen) - 2 Cycle?
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acc_w0 = to_accum(w0);
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acc_w1 = to_accum(w1);
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// Filterkoeffizienten mit Korrekturterm*Acc-Sensor-Sample updaten - 1 Cycle
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acc_w0 += fract_mult(correction, *p_x0);
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acc_w1 += fract_mult(correction, *p_x1);
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//Beide Pointer in der Sample-Line um 2 dekrementieren
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p_x0 = cyclic_add(p_x0, -2, p_xstart, sample_line_len);
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p_x1 = cyclic_add(p_x1, -2, p_xstart, sample_line_len);
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// Filterkoeffizienten in 64-Bit Wort schreiben - wird dann in mit einem Store-Vorgang an Ort wo p_w0 hinzeigt abgelegt - 1 Cycle
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*((long long *)p_w0) = llcompose(rnd_saturate(acc_w0), rnd_saturate(acc_w1));//LOAD/STORE-Hazard - +1 NOP benötigt - 1 Cycle
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p_w0+=2; //Koeffizienten-Pointer um 2 inkrementieren
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}
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}
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void initialize_signal(
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SingleSignalPath *c_sensor_signal_t,
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SingleSignalPath *acc_sensor_signal_t,
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double *b_c,
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double *b_acc,
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int delay_c,
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int delay_acc,
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double weight_c,
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double weight_acc,
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double lms_mu,
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int number_coefficients
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){
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int scale_bits=31;
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// C-Sensor Initialisierung: Biquad, Delay, Weight skalieren und in Struct schreiben
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scale_preemph_filter(c_sensor_signal_t, b_c[0], b_c[1], b_c[2], b_c[3], b_c[4], scale_bits);
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set_delay(c_sensor_signal_t, delay_c);
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set_weight(c_sensor_signal_t, weight_c, scale_bits);
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// Acc-Sensor Initialisierung: Biquad, Delay, Weight skalieren und in Struct schreiben
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scale_preemph_filter(acc_sensor_signal_t, b_acc[0], b_acc[1], b_acc[2], b_acc[3], b_acc[4], scale_bits);
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set_delay(acc_sensor_signal_t, delay_acc);
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set_weight(acc_sensor_signal_t, weight_acc, 31);
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//Mu Skalierung und in globale Variable schreiben
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int scale = pow(2, scale_bits) - 1;
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mu = lms_mu * scale;
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// Buffer Initialisierung (Delay Line und Koeffizienten)
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initialize_buffer_dmb(&pointer_sample_line, sample_line, number_coefficients, MAX_FIR_COEFFS);
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initialize_buffer(&pointer_coefficient_line, coefficient_line, number_coefficients, MAX_FIR_COEFFS);
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// Einträge in Delay Line und Koeffizienten-Array auf 0 setzen
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for (int i = 0; i < number_coefficients; i++) {
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pointer_sample_line.ptr_start[i] = 0;
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pointer_coefficient_line.ptr_start[i] = 0;
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}
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}
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// C-Sensor (d) = Corrupted Signal (Desired Signal + Corruption Noise Signal)
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// Acc-Sensor (x) = Reference Noise Signal
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void calculate_output(
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SingleSignalPath *c_sensor_signal_t,
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SingleSignalPath *acc_sensor_signal_t,
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int16_t volatile chess_storage(DMB) *c_sensor_input, //Pointer auf Input-Port im Shared Memory
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int16_t volatile chess_storage(DMB) *acc_sensor_input, //Pointer auf Input-Port im Shared Memory
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int16_t volatile chess_storage(DMB) *output_port //Pointer auf Output-Port im Shared Memory
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){
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//Speicherbereiche anlegen -> bei blockweiser Verarbeitung hat jedes Array nur den Eintrag [0]
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static int chess_storage(DMA) c_sensor_32[BLOCK_LEN]; //Speicherbereich für 32-Bit C-Sensor Input
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static int chess_storage(DMA) acc_sensor_32[BLOCK_LEN]; //Speicherbereich für 32-Bit Acc-Sensor Input
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static int chess_storage(DMA) c_sensor_pre[BLOCK_LEN]; //Speicherbereich für C-Sensor Preemphasis Input
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static int chess_storage(DMA) acc_sensor_pre[BLOCK_LEN]; //Speicherbereich für Acc-Sensor Preemphasis Input
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static int chess_storage(DMB) filter_accumulator[BLOCK_LEN]; //Speicherbereich für Akkumulator Output des adaptiven Filters
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static int chess_storage(DMB) output_32[BLOCK_LEN]; //Speicherbereich für 32-Bit Output Signal
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// Pointer auf Sample-Speicherbereiche legen - wird nicht benötigt, wenn allgemeine allgemein Arrays für Blockverarbeitung verwendet werden (Array -> automatisch Pointer)
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// static int chess_storage(DMA) *pointer_c_sensor_pre =c_sensor_pre;
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// static int chess_storage(DMA) *pointer_filter_accumulator =acc_sensor_pre;
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// static int chess_storage(DMB) *pointer_output_32=output_32;
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// 16-Bit Eingangssignale auf 32-Bit konvertieren mit Bitshift, Kopie der Samples in funktionseigenem neuen Speicherbereich ablegen (Kein Pointer mehr!)
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for (uint32_t i=0; i<BLOCK_LEN; i++) chess_loop_range(1,){
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c_sensor_32[i] = ((int) c_sensor_input[i]) << BITSHIFT_16_TO_32;
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acc_sensor_32[i] = ((int) acc_sensor_input[i]) << BITSHIFT_16_TO_32;
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}
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// Preemphasis Filter anwenden - wird hier aber nicht genutzt (nur Durchreichen), in neuen Speicherbereich ablegen
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for (uint32_t i=0; i<BLOCK_LEN; i++) chess_loop_range(1,){
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c_sensor_pre[i] = c_sensor_32[i];
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acc_sensor_pre[i] = acc_sensor_32[i];
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}
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// Adaptiven Filter auf C-Sensor Signal anwenden
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//Aktuelles Sample des Acc-Sensors wird in aktuelle Speicheradresse des Pointers der Delay Line geschrieben, dann wird der Pointer inkrementiert -> Delay Line hat Länge der Filterkoeffizienten
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write_buffer_dmb(&pointer_sample_line, acc_sensor_pre[0]);
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// Filter auf Acc-Sensor Signal anwenden und Korrektursignal berechnen
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// Sample des Acc-Sensors in der Sample-Line werden mit den Filterkoeffizienten multipliziert und aufsummiert -> Akkumulator Output des adaptiven Filters
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filter_accumulator[0] = apply_fir_filter(&pointer_sample_line, &pointer_coefficient_line);
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// Output-Signal berechnen -> C-Sensor Sample - Akkumulator Output des adaptiven Filters
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output_32[0] = c_sensor_pre[0] - filter_accumulator[0];
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// Filterkoeffizienten adaptieren
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update_filter_coefficients(&pointer_sample_line, &pointer_coefficient_line, output_32[0]);
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// Bitshift zurück auf 16-Bit und in Ausgangsarray schreiben
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for (uint32_t i=0; i<BLOCK_LEN; i++) chess_flatten_loop
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{
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output_port[i] = rnd_saturate(to_accum(output_32[i]) >> BITSHIFT_16_TO_32);
|
||
}
|
||
|
||
}
|
||
|