fhss.h File Reference

FHSS channel sequencer based on AES-128-ECB. More...

#include <stdint.h>

Go to the source code of this file.

Macros
#define	FHSS_DWELL_MS   2u
	Dwell time per channel in milliseconds.
#define	FHSS_CHANNELS   40u
	Number of channels in the hopping sequence.

Functions
void	fhss_init (void)
	Reset the slot counter to zero.
uint8_t	fhss_next_channel (void)
	Return the next channel in the hopping sequence and advance the slot.
void	fhss_sync_tick (void)
	Advance the slot counter by one (receiver side, no packet received).
void	fhss_set_slot (uint32_t s)
	Force the slot counter to a specific value for RX synchronisation.
uint32_t	fhss_get_slot (void)
	Return the current slot counter value.

Detailed Description

FHSS channel sequencer based on AES-128-ECB.

Both link endpoints derive the same hopping sequence independently from a shared 128-bit key and a monotonically increasing slot counter. No synchronisation traffic is required as long as both sides start from the same slot.

Macro Definition Documentation

FHSS_CHANNELS

#define FHSS_CHANNELS   40u

Number of channels in the hopping sequence.

FHSS_DWELL_MS

#define FHSS_DWELL_MS   2u

Dwell time per channel in milliseconds.

Function Documentation

fhss_get_slot()

uint32_t fhss_get_slot

(

void

)

Return the current slot counter value.

fhss_init()

void fhss_init

(

void

)

Reset the slot counter to zero.

fhss_next_channel()

uint8_t fhss_next_channel

(

void

)

Return the next channel in the hopping sequence and advance the slot.

Returns

Channel index in [0, 39].

fhss_set_slot()

void fhss_set_slot

(

uint32_t

s

)

Force the slot counter to a specific value for RX synchronisation.

Parameters

s	New slot value.

fhss_sync_tick()

void fhss_sync_tick

(

void

)

Advance the slot counter by one (receiver side, no packet received).