sumd.h File Reference

RC protocol definition for Graupner HoTT transmitter. More...

#include <stdint.h>

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Classes
struct	ReceiverFcPacketHoTT

Macros
#define	SUMD_MAX_CHANNELS   32
#define	SUMD_HEADER_LENGTH   3
#define	SUMD_HEADER_ID   0xA8
#define	SUMD_ID_SUMH   0x00
#define	SUMD_ID_SUMD   0x01
#define	SUMD_ID_FAILSAFE   0x81

Functions
uint16_t	sumd_crc16 (uint16_t crc, uint8_t value)
	CRC16 implementation for SUMD protocol. More...
uint8_t	sumd_crc8 (uint8_t crc, uint8_t value)
	CRC8 implementation for SUMH protocol. More...
__EXPORT int	sumd_decode (uint8_t byte, uint8_t *rssi, uint8_t *rx_count, uint16_t *channel_count, uint16_t *channels, uint16_t max_chan_count, bool *failsafe)
	Decoder for SUMD/SUMH protocol. More...

Detailed Description

RC protocol definition for Graupner HoTT transmitter.

Author

Marco Bauer marco.nosp@m.@wtn.nosp@m.s.de

Definition in file sumd.h.

Macro Definition Documentation

SUMD_HEADER_ID

#define SUMD_HEADER_ID   0xA8

Definition at line 50 of file sumd.h.

Referenced by sumd_decode().

SUMD_HEADER_LENGTH

#define SUMD_HEADER_LENGTH   3

Definition at line 49 of file sumd.h.

SUMD_ID_FAILSAFE

#define SUMD_ID_FAILSAFE   0x81

Definition at line 53 of file sumd.h.

Referenced by sumd_decode().

SUMD_ID_SUMD

#define SUMD_ID_SUMD   0x01

Definition at line 52 of file sumd.h.

Referenced by sumd_decode().

SUMD_ID_SUMH

#define SUMD_ID_SUMH   0x00

Definition at line 51 of file sumd.h.

Referenced by sumd_decode().

SUMD_MAX_CHANNELS

#define SUMD_MAX_CHANNELS   32

Definition at line 48 of file sumd.h.

Referenced by sumd_decode().

Function Documentation

sumd_crc16()

uint16_t sumd_crc16	(	uint16_t	crc,
		uint8_t	value
	)

CRC16 implementation for SUMD protocol.

Parameters

crc	Initial CRC Value
value	to accumulate in the checksum

Returns

the checksum

Definition at line 93 of file sumd.cpp.

Referenced by sumd_decode().

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sumd_crc8()

uint8_t sumd_crc8	(	uint8_t	crc,
		uint8_t	value
	)

CRC8 implementation for SUMH protocol.

Parameters

crc	Initial CRC Value
value	to accumulate in the checksum

Returns

the checksum

Definition at line 105 of file sumd.cpp.

Referenced by sumd_decode().

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sumd_decode()

__EXPORT int sumd_decode	(	uint8_t	byte,
		uint8_t *	rssi,
		uint8_t *	rx_count,
		uint16_t *	channel_count,
		uint16_t *	channels,
		uint16_t	max_chan_count,
		bool *	failsafe
	)

Decoder for SUMD/SUMH protocol.

Parameters

byte	current char to read
rssi	pointer to a byte where the RSSI value is written back to
rx_count	pointer to a byte where the receive count of packets signce last wireless frame is written back to
channels	pointer to a datastructure of size max_chan_count where channel values (12 bit) are written back to
max_chan_count	maximum channels to decode - if more channels are decoded, the last n are skipped and success (0) is returned
failsafe	pointer to a boolean where the decoded failsafe flag is written back to

Returns

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

Definition at line 111 of file sumd.cpp.

References _crc16, _crc8, _crcOK, _debug, _decode_state, _rxlen, _sumd, ReceiverFcPacketHoTT::crc16_high, ReceiverFcPacketHoTT::crc16_low, ReceiverFcPacketHoTT::crc8, ReceiverFcPacketHoTT::header, ReceiverFcPacketHoTT::length, ReceiverFcPacketHoTT::status, sumd_crc16(), sumd_crc8(), ReceiverFcPacketHoTT::sumd_data, SUMD_DECODE_STATE_GOT_CRC, SUMD_DECODE_STATE_GOT_CRC16_BYTE_1, SUMD_DECODE_STATE_GOT_CRC16_BYTE_2, SUMD_DECODE_STATE_GOT_DATA, SUMD_DECODE_STATE_GOT_HEADER, SUMD_DECODE_STATE_GOT_LEN, SUMD_DECODE_STATE_GOT_STATE, SUMD_DECODE_STATE_UNSYNCED, SUMD_HEADER_ID, SUMD_ID_FAILSAFE, SUMD_ID_SUMD, SUMD_ID_SUMH, SUMD_MAX_CHANNELS, and ReceiverFcPacketHoTT::telemetry.

Referenced by RCInput::cycle(), dsm_port_input(), and RCTest::sumdTest().

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