317 lines
11 KiB
C
317 lines
11 KiB
C
#include "furi/check.h"
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#include "furi/common_defines.h"
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#include "irda.h"
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#include "irda_common_i.h"
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#include <stdbool.h>
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#include <furi.h>
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#include "irda_i.h"
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#include <stdint.h>
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static void irda_common_decoder_reset_state(IrdaCommonDecoder* decoder);
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static inline size_t consume_samples(uint32_t* array, size_t len, size_t shift) {
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furi_assert(len >= shift);
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len -= shift;
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for (int i = 0; i < len; ++i)
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array[i] = array[i + shift];
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return len;
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}
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static inline void accumulate_lsb(IrdaCommonDecoder* decoder, bool bit) {
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uint16_t index = decoder->databit_cnt / 8;
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uint8_t shift = decoder->databit_cnt % 8; // LSB first
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if (!shift)
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decoder->data[index] = 0;
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if (bit) {
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decoder->data[index] |= (0x1 << shift); // add 1
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} else {
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(void) decoder->data[index]; // add 0
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}
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++decoder->databit_cnt;
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}
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static bool irda_check_preamble(IrdaCommonDecoder* decoder) {
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furi_assert(decoder);
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bool result = false;
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bool start_level = (decoder->level + decoder->timings_cnt + 1) % 2;
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if (decoder->timings_cnt == 0)
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return false;
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// align to start at Mark timing
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if (!start_level) {
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decoder->timings_cnt = consume_samples(decoder->timings, decoder->timings_cnt, 1);
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}
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if (decoder->protocol->timings.preamble_mark == 0) {
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return true;
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}
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while ((!result) && (decoder->timings_cnt >= 2)) {
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float preamble_tolerance = decoder->protocol->timings.preamble_tolerance;
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uint16_t preamble_mark = decoder->protocol->timings.preamble_mark;
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uint16_t preamble_space = decoder->protocol->timings.preamble_space;
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if ((MATCH_TIMING(decoder->timings[0], preamble_mark, preamble_tolerance))
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&& (MATCH_TIMING(decoder->timings[1], preamble_space, preamble_tolerance))) {
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result = true;
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}
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decoder->timings_cnt = consume_samples(decoder->timings, decoder->timings_cnt, 2);
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}
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return result;
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}
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/**
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* decoder->protocol->databit_len[0] contains biggest amount of bits, for this protocol.
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* decoder->protocol->databit_len[1...] contains lesser values, but which can be decoded
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* for some protocol modifications.
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*/
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static IrdaStatus irda_common_decode_bits(IrdaCommonDecoder* decoder) {
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furi_assert(decoder);
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IrdaStatus status = IrdaStatusOk;
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const IrdaTimings* timings = &decoder->protocol->timings;
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while (decoder->timings_cnt && (status == IrdaStatusOk)) {
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bool level = (decoder->level + decoder->timings_cnt + 1) % 2;
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uint32_t timing = decoder->timings[0];
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if (timings->min_split_time && !level) {
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if (timing > timings->min_split_time) {
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/* long low timing - check if we're ready for any of protocol modification */
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for (int i = 0; decoder->protocol->databit_len[i] && (i < COUNT_OF(decoder->protocol->databit_len)); ++i) {
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if (decoder->protocol->databit_len[i] == decoder->databit_cnt) {
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return IrdaStatusReady;
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}
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}
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} else if (decoder->protocol->databit_len[0] == decoder->databit_cnt) {
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/* short low timing for longest protocol - this is signal is longer than we expected */
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return IrdaStatusError;
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}
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}
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status = decoder->protocol->decode(decoder, level, timing);
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furi_check(decoder->databit_cnt <= decoder->protocol->databit_len[0]);
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furi_assert(status == IrdaStatusError || status == IrdaStatusOk);
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if (status == IrdaStatusError) {
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break;
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}
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decoder->timings_cnt = consume_samples(decoder->timings, decoder->timings_cnt, 1);
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/* check if largest protocol version can be decoded */
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if (level && (decoder->protocol->databit_len[0] == decoder->databit_cnt) && !timings->min_split_time) {
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status = IrdaStatusReady;
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break;
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}
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}
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return status;
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}
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/* Pulse Distance-Width Modulation */
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IrdaStatus irda_common_decode_pdwm(IrdaCommonDecoder* decoder, bool level, uint32_t timing) {
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furi_assert(decoder);
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IrdaStatus status = IrdaStatusOk;
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uint32_t bit_tolerance = decoder->protocol->timings.bit_tolerance;
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uint16_t bit1_mark = decoder->protocol->timings.bit1_mark;
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uint16_t bit1_space = decoder->protocol->timings.bit1_space;
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uint16_t bit0_mark = decoder->protocol->timings.bit0_mark;
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uint16_t bit0_space = decoder->protocol->timings.bit0_space;
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bool analyze_timing = level ^ (bit1_mark == bit0_mark);
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uint16_t bit1 = level ? bit1_mark : bit1_space;
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uint16_t bit0 = level ? bit0_mark : bit0_space;
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uint16_t no_info_timing = (bit1_mark == bit0_mark) ? bit1_mark : bit1_space;
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if (analyze_timing) {
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if (MATCH_TIMING(timing, bit1, bit_tolerance)) {
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accumulate_lsb(decoder, 1);
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} else if (MATCH_TIMING(timing, bit0, bit_tolerance)) {
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accumulate_lsb(decoder, 0);
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} else {
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status = IrdaStatusError;
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}
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} else {
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if (!MATCH_TIMING(timing, no_info_timing, bit_tolerance)) {
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status = IrdaStatusError;
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}
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}
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return status;
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}
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/* level switch detection goes in middle of time-quant */
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IrdaStatus irda_common_decode_manchester(IrdaCommonDecoder* decoder, bool level, uint32_t timing) {
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furi_assert(decoder);
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uint16_t bit = decoder->protocol->timings.bit1_mark;
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uint16_t tolerance = decoder->protocol->timings.bit_tolerance;
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bool* switch_detect = &decoder->switch_detect;
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furi_assert((*switch_detect == true) || (*switch_detect == false));
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bool single_timing = MATCH_TIMING(timing, bit, tolerance);
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bool double_timing = MATCH_TIMING(timing, 2*bit, tolerance);
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if(!single_timing && !double_timing) {
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return IrdaStatusError;
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}
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if (decoder->protocol->manchester_start_from_space && (decoder->databit_cnt == 0)) {
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*switch_detect = 1; /* fake as we were previously in the middle of time-quant */
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accumulate_lsb(decoder, 0);
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}
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if (*switch_detect == 0) {
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if (double_timing) {
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return IrdaStatusError;
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}
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/* only single timing - level switch required in the middle of time-quant */
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*switch_detect = 1;
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} else {
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/* double timing means we're in the middle of time-quant again */
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if (single_timing)
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*switch_detect = 0;
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}
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if (*switch_detect) {
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if (decoder->protocol->databit_len[0] == decoder->databit_cnt) {
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return IrdaStatusError;
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}
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accumulate_lsb(decoder, level);
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}
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return IrdaStatusOk;
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}
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IrdaMessage* irda_common_decoder_check_ready(IrdaCommonDecoder* decoder) {
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IrdaMessage* message = NULL;
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bool found_length = false;
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for (int i = 0; decoder->protocol->databit_len[i] && (i < COUNT_OF(decoder->protocol->databit_len)); ++i) {
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if (decoder->protocol->databit_len[i] == decoder->databit_cnt) {
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found_length = true;
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break;
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}
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}
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if (found_length && decoder->protocol->interpret(decoder)) {
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decoder->databit_cnt = 0;
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message = &decoder->message;
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if (decoder->protocol->decode_repeat) {
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decoder->state = IrdaCommonDecoderStateProcessRepeat;
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} else {
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decoder->state = IrdaCommonDecoderStateWaitPreamble;
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}
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}
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return message;
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}
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IrdaMessage* irda_common_decode(IrdaCommonDecoder* decoder, bool level, uint32_t duration) {
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furi_assert(decoder);
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IrdaMessage* message = 0;
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IrdaStatus status = IrdaStatusError;
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if (decoder->level == level) {
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irda_common_decoder_reset(decoder);
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}
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decoder->level = level; // start with low level (Space timing)
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decoder->timings[decoder->timings_cnt] = duration;
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decoder->timings_cnt++;
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furi_check(decoder->timings_cnt <= sizeof(decoder->timings));
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while(1) {
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switch (decoder->state) {
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case IrdaCommonDecoderStateWaitPreamble:
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if (irda_check_preamble(decoder)) {
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decoder->state = IrdaCommonDecoderStateDecode;
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decoder->databit_cnt = 0;
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decoder->switch_detect = false;
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continue;
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}
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break;
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case IrdaCommonDecoderStateDecode:
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status = irda_common_decode_bits(decoder);
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if (status == IrdaStatusReady) {
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message = irda_common_decoder_check_ready(decoder);
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if (message) {
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continue;
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} else if (decoder->protocol->databit_len[0] == decoder->databit_cnt) {
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/* error: can't decode largest protocol - begin decoding from start */
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decoder->state = IrdaCommonDecoderStateWaitPreamble;
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}
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} else if (status == IrdaStatusError) {
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irda_common_decoder_reset_state(decoder);
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continue;
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}
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break;
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case IrdaCommonDecoderStateProcessRepeat:
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status = decoder->protocol->decode_repeat(decoder);
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if (status == IrdaStatusError) {
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irda_common_decoder_reset_state(decoder);
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continue;
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} else if (status == IrdaStatusReady) {
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decoder->message.repeat = true;
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message = &decoder->message;
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}
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break;
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}
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break;
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}
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return message;
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}
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void* irda_common_decoder_alloc(const IrdaCommonProtocolSpec* protocol) {
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furi_assert(protocol);
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/* protocol->databit_len[0] has to contain biggest value of bits that can be decoded */
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for (int i = 1; i < COUNT_OF(protocol->databit_len); ++i) {
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furi_assert(protocol->databit_len[i] <= protocol->databit_len[0]);
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}
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uint32_t alloc_size = sizeof(IrdaCommonDecoder)
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+ protocol->databit_len[0] / 8
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+ !!(protocol->databit_len[0] % 8);
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IrdaCommonDecoder* decoder = furi_alloc(alloc_size);
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decoder->protocol = protocol;
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decoder->level = true;
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return decoder;
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}
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void irda_common_decoder_free(IrdaCommonDecoder* decoder) {
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furi_assert(decoder);
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free(decoder);
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}
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void irda_common_decoder_reset_state(IrdaCommonDecoder* decoder) {
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decoder->state = IrdaCommonDecoderStateWaitPreamble;
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decoder->databit_cnt = 0;
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decoder->switch_detect = false;
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decoder->message.protocol = IrdaProtocolUnknown;
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if (decoder->protocol->timings.preamble_mark == 0) {
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if (decoder->timings_cnt > 0) {
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decoder->timings_cnt = consume_samples(decoder->timings, decoder->timings_cnt, 1);
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}
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}
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}
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void irda_common_decoder_reset(IrdaCommonDecoder* decoder) {
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furi_assert(decoder);
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irda_common_decoder_reset_state(decoder);
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decoder->timings_cnt = 0;
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}
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