nrf_802154_procedures_duration.h

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/*
 * Copyright (c) 2017, Nordic Semiconductor ASA
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 * SPDX-License-Identifier: BSD-3-Clause
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 *    list of conditions and the following disclaimer.
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#ifndef NRF_802154_PROCEDURES_DURATION_H_
#define NRF_802154_PROCEDURES_DURATION_H_
 
#include <stdbool.h>
#include <stdint.h>
#include "nrfx.h"
 
#include "nrf_802154_const.h"
 
#define TX_RAMP_UP_TIME                   40 // us
#define RX_RAMP_UP_TIME                   40 // us
#define RX_RAMP_DOWN_TIME                 0  // us
#define MAX_RAMP_DOWN_TIME                6  // us
#define RX_TX_TURNAROUND_TIME             20 // us
 
#define A_CCA_DURATION_SYMBOLS            8  // sym
#define A_TURNAROUND_TIME_SYMBOLS         12 // sym
#define A_UNIT_BACKOFF_SYMBOLS            20 // sym
 
#define PHY_SYMBOLS_FROM_OCTETS(octets)   ((octets) * PHY_SYMBOLS_PER_OCTET)
#define PHY_US_TIME_FROM_SYMBOLS(symbols) ((symbols) * PHY_US_PER_SYMBOL)
 
#define IMM_ACK_SYMBOLS                   (PHY_SHR_SYMBOLS + \
                                           PHY_SYMBOLS_FROM_OCTETS(IMM_ACK_LENGTH + PHR_SIZE))
#define IMM_ACK_DURATION                  (PHY_US_TIME_FROM_SYMBOLS(IMM_ACK_SYMBOLS))
 
#define MAC_IMM_ACK_WAIT_SYMBOLS          (A_UNIT_BACKOFF_SYMBOLS +    \
                                           A_TURNAROUND_TIME_SYMBOLS + \
                                           IMM_ACK_SYMBOLS)
 
#define MAX_PHY_FRAME_TIME_US \
    PHY_US_TIME_FROM_SYMBOLS( \
        PHY_SHR_SYMBOLS + PHY_SYMBOLS_FROM_OCTETS(PHR_SIZE + MAX_PACKET_SIZE))
 
__STATIC_INLINE uint16_t nrf_802154_tx_duration_get(uint8_t psdu_length,
                                                    bool    cca,
                                                    bool    ack_requested);
 
__STATIC_INLINE uint16_t nrf_802154_cca_before_tx_duration_get(void);
 
__STATIC_INLINE uint16_t nrf_802154_rx_duration_get(uint8_t psdu_length, bool ack_requested);
 
__STATIC_INLINE uint16_t nrf_802154_cca_duration_get(void);
 
#ifndef SUPPRESS_INLINE_IMPLEMENTATION
 
__STATIC_INLINE uint16_t nrf_802154_frame_duration_get(uint8_t psdu_length,
                                                       bool    shr,
                                                       bool    phr)
{
    uint16_t us_time = PHY_US_TIME_FROM_SYMBOLS(PHY_SYMBOLS_FROM_OCTETS(psdu_length));
 
    if (phr)
    {
        us_time += PHY_US_TIME_FROM_SYMBOLS(PHY_SYMBOLS_FROM_OCTETS(PHR_SIZE));
    }
 
    if (shr)
    {
        us_time += PHY_US_TIME_FROM_SYMBOLS(PHY_SHR_SYMBOLS);
    }
 
    return us_time;
}
 
__STATIC_INLINE uint16_t nrf_802154_tx_duration_get(uint8_t psdu_length,
                                                    bool    cca,
                                                    bool    ack_requested)
{
    // ramp down
    // if CCA: + RX ramp up + CCA + RX ramp down
    // + TX ramp up + SHR + PHR + PSDU
    // if ACK: + macAckWaitDuration
    uint16_t us_time = MAX_RAMP_DOWN_TIME + TX_RAMP_UP_TIME + nrf_802154_frame_duration_get(
        psdu_length,
        true,
        true);
 
    if (ack_requested)
    {
        us_time += PHY_US_TIME_FROM_SYMBOLS(MAC_IMM_ACK_WAIT_SYMBOLS);
    }
 
    if (cca)
    {
        us_time += RX_RAMP_UP_TIME + RX_RAMP_DOWN_TIME + PHY_US_TIME_FROM_SYMBOLS(
            A_CCA_DURATION_SYMBOLS);
    }
 
    return us_time;
}
 
__STATIC_INLINE uint16_t nrf_802154_cca_before_tx_duration_get(void)
{
    // CCA + turnaround time
    uint16_t us_time = PHY_US_TIME_FROM_SYMBOLS(A_CCA_DURATION_SYMBOLS) + RX_TX_TURNAROUND_TIME;
 
    return us_time;
}
 
__STATIC_INLINE uint16_t nrf_802154_ack_duration_with_turnaround_get(void)
{
    // aTurnaroundTime + ACK frame duration
    return PHY_US_TIME_FROM_SYMBOLS(A_TURNAROUND_TIME_SYMBOLS +
                                    PHY_SHR_SYMBOLS +
                                    PHY_SYMBOLS_FROM_OCTETS(IMM_ACK_LENGTH + PHR_SIZE));
}
 
__STATIC_INLINE uint16_t nrf_802154_rx_duration_get(uint8_t psdu_length, bool ack_requested)
{
    // SHR + PHR + PSDU
    // if ACK: + aTurnaroundTime + ACK frame duration
    uint16_t us_time = nrf_802154_frame_duration_get(psdu_length, true, true);
 
    if (ack_requested)
    {
        us_time += nrf_802154_ack_duration_with_turnaround_get();
    }
 
    return us_time;
}
 
__STATIC_INLINE uint16_t nrf_802154_cca_duration_get(void)
{
    // ramp down + rx ramp up + CCA
    uint16_t us_time = MAX_RAMP_DOWN_TIME +
                       RX_RAMP_UP_TIME +
                       PHY_US_TIME_FROM_SYMBOLS(A_CCA_DURATION_SYMBOLS);
 
    return us_time;
}
 
#endif /* SUPPRESS_INLINE_IMPLEMENTATION */
 
#endif /* NRF_802154_PROCEDURES_DURATION_H_ */