tal_slotted_csma.c File Reference

This file implements slotted CSMA-CA functions.

Copyright (c) 2013-2018 Microchip Technology Inc. and its subsidiaries.

#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include "pal.h"
#include "return_val.h"
#include "tal.h"
#include "ieee_const.h"
#include "tal_constants.h"
#include "tal_slotted_csma.h"
#include "tal_pib.h"
#include "at86rf233.h"
#include "tal_internal.h"
#include "tal_tx.h"
#include "tal_irq_handler.h"
#include "mac_build_config.h"

Macros
#define	ACK_FRAME   (0x02)
#define	ACK_FRAME_LEN   (0x05)
#define	CCA_GUARD_DURATION_US
#define	CONVERT_OCTETS_TO_SYM(octets)   (2 * octets)
#define	CSMA_BEACON_LOSS_GUARD_TIME_US   (2000)
#define	PRE_BEACON_GUARD_TIME_US   (1000)

Functions
static void	beacon_loss_timer_cb (void *parameter)
	Handler for beacon loss timer. More...
uint16_t	calc_frame_transmit_duration (uint8_t *phy_frame)
	Calculates the entire transaction duration. More...
static void	calculate_transaction_duration (void)
	Calculates the entire transaction duration. More...
static void	cca_timer_handler_cb (void *parameter)
	CCA timer callback. More...
static bool	check_beacon_reception (void)
	Checks if node is receiving beacons. More...
static void	csma_backoff_calculation (void)
	Calculates backoff duration and handles the start of the CCA. More...
static void	csma_param_init (void)
	Initializes CSMA variables. More...
static uint8_t	perform_cca_twice (void)
	Performs CCA twice. More...
static void	send_frame_at_next_backoff_boundary (void)
	Sends the frame at the next backoff boundary. More...
bool	slotted_csma_start (bool perform_frame_retry)
	Starts slotted CSMA. More...
void	slotted_csma_state_handling (void)
	State machine handling slotted CSMA. More...
static void	start_beacon_loss_timer (void)
	Starts the beacon loss timer. More...
static void	tx_done (retval_t status)
	Finalizes the CSMA procedure. More...

Variables
static uint8_t	BE
static uint32_t	cca_starttime_us
static uint8_t	NB
static uint8_t	number_of_tx_retries
static uint8_t	remaining_backoff_periods
static uint8_t	transaction_duration_periods