85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
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#include <stdbool.h>
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#include <stdint.h>
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#include <furi.h>
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#include "../irda_i.h"
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static bool interpret_nec(IrdaCommonDecoder* decoder);
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static DecodeStatus decode_repeat_nec(IrdaCommonDecoder* decoder);
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static const IrdaCommonProtocolSpec protocol_nec = {
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{
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IRDA_NEC_PREAMBULE_MARK,
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IRDA_NEC_PREAMBULE_SPACE,
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IRDA_NEC_BIT1_MARK,
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IRDA_NEC_BIT1_SPACE,
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IRDA_NEC_BIT0_MARK,
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IRDA_NEC_BIT0_SPACE,
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IRDA_NEC_PREAMBLE_TOLERANCE,
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IRDA_NEC_BIT_TOLERANCE,
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},
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32,
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irda_common_decode_pdwm,
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interpret_nec,
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decode_repeat_nec,
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};
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static bool interpret_nec(IrdaCommonDecoder* decoder) {
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furi_assert(decoder);
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bool result = false;
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uint8_t address = decoder->data[0];
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uint8_t address_inverse = decoder->data[1];
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uint8_t command = decoder->data[2];
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uint8_t command_inverse = decoder->data[3];
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if ((command == (uint8_t) ~command_inverse) && (address == (uint8_t) ~address_inverse)) {
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decoder->message.command = command;
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decoder->message.address = address;
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decoder->message.repeat = false;
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result = true;
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}
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return result;
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}
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// timings start from Space (delay between message and repeat)
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static DecodeStatus decode_repeat_nec(IrdaCommonDecoder* decoder) {
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furi_assert(decoder);
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float preamble_tolerance = decoder->protocol->timings.preamble_tolerance;
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uint32_t bit_tolerance = decoder->protocol->timings.bit_tolerance;
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DecodeStatus status = DecodeStatusError;
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if (decoder->timings_cnt < 4)
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return DecodeStatusOk;
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if ((decoder->timings[0] > IRDA_NEC_REPEAT_PAUSE_MIN)
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&& (decoder->timings[0] < IRDA_NEC_REPEAT_PAUSE_MAX)
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&& MATCH_PREAMBLE_TIMING(decoder->timings[1], IRDA_NEC_REPEAT_MARK, preamble_tolerance)
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&& MATCH_PREAMBLE_TIMING(decoder->timings[2], IRDA_NEC_REPEAT_SPACE, preamble_tolerance)
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&& MATCH_BIT_TIMING(decoder->timings[3], decoder->protocol->timings.bit1_mark, bit_tolerance)) {
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status = DecodeStatusReady;
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decoder->timings_cnt = 0;
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} else {
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status = DecodeStatusError;
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}
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return status;
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}
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void* irda_decoder_nec_alloc(void) {
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return irda_common_decoder_alloc(&protocol_nec);
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}
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IrdaMessage* irda_decoder_nec_decode(void* decoder, bool level, uint32_t duration) {
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return irda_common_decode(decoder, level, duration);
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}
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void irda_decoder_nec_free(void* decoder) {
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irda_common_decoder_free(decoder);
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}
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