sumd.cpp File Reference

#include <stdio.h>
#include <stdint.h>
#include "sumd.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
#define	SUMD_RANGE_MIN   0.0f
#define	SUMD_RANGE_MAX   4096.0f
#define	SUMD_TARGET_MIN   1000.0f
#define	SUMD_TARGET_MAX   2000.0f
#define	SUMD_SCALE_FACTOR   ((SUMD_TARGET_MAX - SUMD_TARGET_MIN) / (SUMD_RANGE_MAX - SUMD_RANGE_MIN))
#define	SUMD_SCALE_OFFSET   (int)(SUMD_TARGET_MIN - (SUMD_SCALE_FACTOR * SUMD_RANGE_MIN + 0.5f))

Enumerations
enum	SUMD_DECODE_STATE {   SUMD_DECODE_STATE_UNSYNCED = 0, SUMD_DECODE_STATE_GOT_HEADER, SUMD_DECODE_STATE_GOT_STATE, SUMD_DECODE_STATE_GOT_LEN,   SUMD_DECODE_STATE_GOT_DATA, SUMD_DECODE_STATE_GOT_CRC, SUMD_DECODE_STATE_GOT_CRC16_BYTE_1, SUMD_DECODE_STATE_GOT_CRC16_BYTE_2 }

Functions
static uint16_t	sumd_crc16 (uint16_t crc, uint8_t value)
static uint8_t	sumd_crc8 (uint8_t crc, uint8_t value)
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)

Variables
static uint8_t	_crc8 = 0x00
static uint16_t	_crc16 = 0x0000
static bool	_sumd = true
static bool	_crcOK = false
static bool	_debug = false
static enum SUMD_DECODE_STATE	_decode_state = SUMD_DECODE_STATE_UNSYNCED
static uint8_t	_rxlen
static ReceiverFcPacketHoTT	_rxpacket

Macro Definition Documentation

SUMD_HEADER_ID

#define SUMD_HEADER_ID   0xA8

Definition at line 52 of file sumd.cpp.

Referenced by sumd_decode().

SUMD_HEADER_LENGTH

#define SUMD_HEADER_LENGTH   3

Definition at line 51 of file sumd.cpp.

SUMD_ID_FAILSAFE

#define SUMD_ID_FAILSAFE   0x81

Definition at line 55 of file sumd.cpp.

SUMD_ID_SUMD

#define SUMD_ID_SUMD   0x01

Definition at line 54 of file sumd.cpp.

Referenced by sumd_decode().

SUMD_ID_SUMH

#define SUMD_ID_SUMH   0x00

Definition at line 53 of file sumd.cpp.

Referenced by sumd_decode().

SUMD_MAX_CHANNELS

#define SUMD_MAX_CHANNELS   32

Definition at line 50 of file sumd.cpp.

Referenced by sumd_decode().

SUMD_RANGE_MAX

#define SUMD_RANGE_MAX   4096.0f

Definition at line 104 of file sumd.cpp.

SUMD_RANGE_MIN

#define SUMD_RANGE_MIN   0.0f

Definition at line 103 of file sumd.cpp.

SUMD_SCALE_FACTOR

#define SUMD_SCALE_FACTOR   ((SUMD_TARGET_MAX - SUMD_TARGET_MIN) / (SUMD_RANGE_MAX - SUMD_RANGE_MIN))

Definition at line 110 of file sumd.cpp.

SUMD_SCALE_OFFSET

#define SUMD_SCALE_OFFSET   (int)(SUMD_TARGET_MIN - (SUMD_SCALE_FACTOR * SUMD_RANGE_MIN + 0.5f))

Definition at line 111 of file sumd.cpp.

SUMD_TARGET_MAX

#define SUMD_TARGET_MAX   2000.0f

Definition at line 107 of file sumd.cpp.

SUMD_TARGET_MIN

#define SUMD_TARGET_MIN   1000.0f

Definition at line 106 of file sumd.cpp.

Enumeration Type Documentation

SUMD_DECODE_STATE

enum SUMD_DECODE_STATE

Enumerator
SUMD_DECODE_STATE_UNSYNCED
SUMD_DECODE_STATE_GOT_HEADER
SUMD_DECODE_STATE_GOT_STATE
SUMD_DECODE_STATE_GOT_LEN
SUMD_DECODE_STATE_GOT_DATA
SUMD_DECODE_STATE_GOT_CRC
SUMD_DECODE_STATE_GOT_CRC16_BYTE_1
SUMD_DECODE_STATE_GOT_CRC16_BYTE_2

Definition at line 72 of file sumd.cpp.

Function Documentation

sumd_crc16()

static uint16_t sumd_crc16 ( uint16_t  crc, uint8_t  value  )

static

Definition at line 119 of file sumd.cpp.

Referenced by sumd_decode().

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sumd_crc8()

static uint8_t sumd_crc8 ( uint8_t  crc, uint8_t  value  )

static

Definition at line 131 of file sumd.cpp.

Referenced by sumd_decode().

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sumd_decode()

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
	)

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

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 137 of file sumd.cpp.

Referenced by F4Light::PPM_parser::_process_dsm_pulse(), Linux::RCInput::add_sumd_input(), and F4Light::DSM_parser::init().

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Variable Documentation

_crc16

uint16_t _crc16 = 0x0000

static

Definition at line 96 of file sumd.cpp.

Referenced by sumd_decode().

_crc8

uint8_t _crc8 = 0x00

static

Definition at line 95 of file sumd.cpp.

Referenced by sumd_decode().

_crcOK

bool _crcOK = false

static

Definition at line 98 of file sumd.cpp.

Referenced by sumd_decode().

_debug

bool _debug = false

static

Definition at line 99 of file sumd.cpp.

Referenced by sumd_decode().

_decode_state

enum SUMD_DECODE_STATE _decode_state = SUMD_DECODE_STATE_UNSYNCED

static

Definition at line 113 of file sumd.cpp.

Referenced by sumd_decode().

_rxlen

uint8_t _rxlen

static

Definition at line 114 of file sumd.cpp.

Referenced by sumd_decode().

_rxpacket

ReceiverFcPacketHoTT _rxpacket

static

Definition at line 116 of file sumd.cpp.

_sumd

bool _sumd = true

static

Definition at line 97 of file sumd.cpp.

Referenced by sumd_decode().