Mon, 24 Jun 2024 17:09:07 +0200
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1 | /** |
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2 | * Copyright (c) 2023 mjcross |
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3 | * |
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4 | * SPDX-License-Identifier: MIT |
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5 | **/ |
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6 | |
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7 | #include "owb_rmt_bus_timings.h" |
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8 | |
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9 | // RMT transmit channel symbols for the onewire bus signals and conditions |
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10 | // |
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11 | |
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12 | // basic bus levels |
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13 | // ---------------- |
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14 | // note: we configure the transmit channel to be hardware inverted, |
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15 | // so that the bus initialises in the 'released' state |
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16 | #define OWB_RMT_BUS_ASSERTED 1 |
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17 | #define OWB_RMT_BUS_RELEASED 0 |
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18 | |
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19 | // bus symbols as `rmt_symbol_word_t` |
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20 | // ---------------------------------- |
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21 | |
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22 | // send 'zero' bit |
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23 | #define OWB_RMT_SYMBOL_0BIT { \ |
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24 | .level0 = OWB_RMT_BUS_ASSERTED, \ |
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25 | .duration0 = OWB_TIMING_PARAM_C, \ |
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26 | .level1 = OWB_RMT_BUS_RELEASED, \ |
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27 | .duration1 = OWB_TIMING_PARAM_D } |
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28 | |
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29 | // send 'one' bit |
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30 | #define OWB_RMT_SYMBOL_1BIT { \ |
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31 | .level0 = OWB_RMT_BUS_ASSERTED, \ |
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32 | .duration0 = OWB_TIMING_PARAM_A, \ |
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33 | .level1 = OWB_RMT_BUS_RELEASED, \ |
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34 | .duration1 = OWB_TIMING_PARAM_B } |
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35 | |
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36 | // send bus reset |
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37 | #define OWB_RMT_SYMBOL_RESET { \ |
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38 | .level0 = OWB_RMT_BUS_ASSERTED, \ |
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39 | .duration0 = OWB_TIMING_PARAM_H, \ |
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40 | .level1 = OWB_RMT_BUS_RELEASED, \ |
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41 | .duration1 = OWB_TIMING_PARAM_I + OWB_TIMING_PARAM_J } |
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42 |