radio.c File Reference

RADIO peripheral driver implementation. More...

#include "radio.h"
#include "fhss.h"
#include "regs.h"
#include <nrf52840.h>
#include <string.h>

Macros
#define	MAX_PAYLOAD   255u
#define	BUF_SIZE   (1u + MAX_PAYLOAD)
#define	DEFAULT_CHANNEL   20u /* 2400 + 20 = 2420 MHz (MAP=0) */
#define	RADIO_BASE0   0x12345678u
#define	RADIO_PREFIX0   0xABu /* logical address 0: RADIO_BASE0 + RADIO_PREFIX0[7:0] */

Functions
static void	timer_init (void)
static void	dwell_start (void)
static void	dwell_wait (void)
void	radio_init (void)
	Configure the RADIO peripheral (mode, packet format, address, CRC, power).
void	radio_set_channel (uint8_t ch)
	Set the RF channel.
void	radio_tx (const uint8_t *data, uint8_t len)
	Transmit one packet synchronously.
void	radio_tx_burst (void)
	Transmit one FHSS hop: advance channel, send PTT frame, hold dwell time.
bool	radio_rx_burst (ptt_frame_t *frame_out)
	Receive one FHSS hop: advance channel, listen for FHSS_DWELL_MS ms.

Variables
static uint8_t	pkt_buf [BUF_SIZE]

Detailed Description

RADIO peripheral driver implementation.

Macro Definition Documentation

BUF_SIZE

#define BUF_SIZE   (1u + MAX_PAYLOAD)

DEFAULT_CHANNEL

#define DEFAULT_CHANNEL   20u /* 2400 + 20 = 2420 MHz (MAP=0) */

MAX_PAYLOAD

#define MAX_PAYLOAD   255u

RADIO_BASE0

#define RADIO_BASE0   0x12345678u

RADIO_PREFIX0

#define RADIO_PREFIX0   0xABu /* logical address 0: RADIO_BASE0 + RADIO_PREFIX0[7:0] */

Function Documentation

dwell_start()

static void dwell_start ( void  )

static

dwell_wait()

static void dwell_wait ( void  )

static

radio_init()

void radio_init

(

void

)

Configure the RADIO peripheral (mode, packet format, address, CRC, power).

radio_rx_burst()

bool radio_rx_burst

(

ptt_frame_t *

frame_out

)

Receive one FHSS hop: advance channel, listen for FHSS_DWELL_MS ms.

If a packet with a valid CRC arrives during the dwell window, frame_out is filled and the function returns true. The caller should then call fhss_set_slot(frame_out->slot + 1) to synchronise the hopping sequence.

Parameters

frame_out

Destination for the received frame (must not be NULL).

Returns

true if a valid packet was received, false on timeout or CRC error.

radio_set_channel()

void radio_set_channel

(

uint8_t

ch

)

Set the RF channel.

Parameters

ch	Channel index 0-39, maps to 2400+ch MHz (MAP=0).

radio_tx()

void radio_tx	(	const uint8_t *	data,
		uint8_t	len
	)

Transmit one packet synchronously.

Loads data into the internal packet buffer, asserts TASKS_TXEN, and returns after EVENTS_END fires. RADIO is DISABLED automatically via the END_DISABLE shortcut before the function returns.

Parameters

data	Payload bytes.
len	Payload length (0-255 bytes).

radio_tx_burst()

void radio_tx_burst

(

void

)

Transmit one FHSS hop: advance channel, send PTT frame, hold dwell time.

Call repeatedly in a loop while the PTT button is held. Each call occupies exactly FHSS_DWELL_MS milliseconds.

timer_init()

static void timer_init ( void  )

static

Variable Documentation

pkt_buf

uint8_t pkt_buf[BUF_SIZE]

static