| /* Copyright (c) 2017, Nordic Semiconductor ASA |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * 3. Neither the name of Nordic Semiconductor ASA nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| /** |
| * @brief This module contains calculations of 802.15.4 radio driver procedures duration. |
| * |
| */ |
| |
| #ifndef NRF_DRV_RADIO802154_PROCEDURES_DURATION_H_ |
| #define NRF_DRV_RADIO802154_PROCEDURES_DURATION_H_ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| |
| #define PHY_US_PER_SYMBOL 16 |
| #define PHY_SYMBOLS_PER_OCTET 2 |
| #define PHY_SHR_DURATION 10 |
| |
| #define A_CCA_DURATION 8 |
| #define A_TURNAROUND_TIME 12 |
| #define A_UNIT_BACKOFF_PERIOD 20 |
| |
| #define NUM_OCTETS_IN_ACK 6 |
| |
| #define MAC_ACK_WAIT_DURATION (A_UNIT_BACKOFF_PERIOD + \ |
| A_TURNAROUND_TIME + \ |
| PHY_SHR_DURATION + \ |
| (NUM_OCTETS_IN_ACK * PHY_SYMBOLS_PER_OCTET)) |
| |
| static inline uint16_t nrf_drv_radio802154_tx_duration_get(uint8_t psdu_length, bool ack_requested) |
| { |
| // aTurnaroundTime + CCA + aTurnaroundTime + SHR + PHR + PSDU |
| // if ACK: + macAckWaitDuration |
| uint16_t result = A_TURNAROUND_TIME + A_CCA_DURATION + A_TURNAROUND_TIME + PHY_SHR_DURATION; |
| result += (psdu_length + 1) * PHY_SYMBOLS_PER_OCTET; |
| |
| if (ack_requested) |
| { |
| result += MAC_ACK_WAIT_DURATION; |
| } |
| |
| result *= PHY_US_PER_SYMBOL; |
| |
| return result; |
| } |
| |
| static inline uint16_t nrf_drv_radio802154_rx_duration_get(uint8_t psdu_length, bool ack_requested) |
| { |
| // SHR + PHR + PSDU |
| // if ACK: + aTurnaroundTime + ACK frame duration + aTurnaroundTime |
| uint16_t result = PHY_SHR_DURATION + (psdu_length + 1) * PHY_SYMBOLS_PER_OCTET; |
| |
| if (ack_requested) |
| { |
| result += A_TURNAROUND_TIME + |
| PHY_SHR_DURATION + |
| (NUM_OCTETS_IN_ACK * PHY_SYMBOLS_PER_OCTET) + |
| A_TURNAROUND_TIME; |
| } |
| |
| result *= PHY_US_PER_SYMBOL; |
| |
| return result; |
| } |
| |
| #endif /* NRF_DRV_RADIO802154_PROCEDURES_DURATION_H_ */ |