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59 lines
2.8 KiB
59 lines
2.8 KiB
/* |
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SUMD decoder, based on PX4Firmware/src/rc/lib/rc/sumd.c from PX4Firmware |
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modified for use in AP_HAL_* by Andrew Tridgell |
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*/ |
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/**************************************************************************** |
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* |
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* Copyright (c) 2015 PX4 Development Team. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name PX4 nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/** |
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* @file sumd.h |
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* |
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* RC protocol definition for Graupner HoTT transmitter |
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* |
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* @author Marco Bauer <marco@wtns.de> |
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*/ |
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#pragma once |
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/** |
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* Decoder for SUMD/SUMH protocol |
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* |
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* @param byte current char to read |
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* @param rssi pointer to a byte where the RSSI value is written back to |
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* @param rx_count pointer to a byte where the receive count of packets signce last wireless frame is written back to |
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* @param channels pointer to a datastructure of size max_chan_count where channel values (12 bit) are written back to |
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* @param max_chan_count maximum channels to decode - if more channels are decoded, the last n are skipped and success (0) is returned |
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* @return 0 for success (a decoded packet), 1 for no packet yet (accumulating), 2 for unknown packet, 3 for out of sync, 4 for checksum error |
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*/ |
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int sumd_decode(uint8_t byte, uint8_t *rssi, uint8_t *rx_count, uint16_t *channel_count, |
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uint16_t *channels, uint16_t max_chan_count);
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