components/esp32-owb/include/owb_rmt_bus_symbols.h@acc1904cd70d (annotated)
components/esp32-owb/include/owb_rmt_bus_symbols.h
Tue, 26 Sep 2023 14:57:18 +0200
- author
- Michiel Broek <mbroek@mbse.eu>
- date
- Tue, 26 Sep 2023 14:57:18 +0200
- changeset 72
- acc1904cd70d
- permissions
- -rw-r--r--
Migrated to isp-idf v5.1
| 72 | 1 | /** |
| 2 | * Copyright (c) 2023 mjcross | |
| 3 | * | |
| 4 | * SPDX-License-Identifier: MIT | |
| 5 | **/ | |
| 6 | ||
| 7 | #include "owb_rmt_bus_timings.h" | |
| 8 | ||
| 9 | // RMT transmit channel symbols for the onewire bus signals and conditions | |
| 10 | // | |
| 11 | ||
| 12 | // basic bus levels | |
| 13 | // ---------------- | |
| 14 | // note: we configure the transmit channel to be hardware inverted, | |
| 15 | // so that the bus initialises in the 'released' state | |
| 16 | #define OWB_RMT_BUS_ASSERTED 1 | |
| 17 | #define OWB_RMT_BUS_RELEASED 0 | |
| 18 | ||
| 19 | // bus symbols as `rmt_symbol_word_t` | |
| 20 | // ---------------------------------- | |
| 21 | ||
| 22 | // send 'zero' bit | |
| 23 | #define OWB_RMT_SYMBOL_0BIT { \ | |
| 24 | .level0 = OWB_RMT_BUS_ASSERTED, \ | |
| 25 | .duration0 = OWB_TIMING_PARAM_C, \ | |
| 26 | .level1 = OWB_RMT_BUS_RELEASED, \ | |
| 27 | .duration1 = OWB_TIMING_PARAM_D } | |
| 28 | ||
| 29 | // send 'one' bit | |
| 30 | #define OWB_RMT_SYMBOL_1BIT { \ | |
| 31 | .level0 = OWB_RMT_BUS_ASSERTED, \ | |
| 32 | .duration0 = OWB_TIMING_PARAM_A, \ | |
| 33 | .level1 = OWB_RMT_BUS_RELEASED, \ | |
| 34 | .duration1 = OWB_TIMING_PARAM_B } | |
| 35 | ||
| 36 | // send bus reset | |
| 37 | #define OWB_RMT_SYMBOL_RESET { \ | |
| 38 | .level0 = OWB_RMT_BUS_ASSERTED, \ | |
| 39 | .duration0 = OWB_TIMING_PARAM_H, \ | |
| 40 | .level1 = OWB_RMT_BUS_RELEASED, \ | |
| 41 | .duration1 = OWB_TIMING_PARAM_I + OWB_TIMING_PARAM_J } | |
| 42 |
