| /* Copyright (c) 2018, 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. |
| * |
| */ |
| |
| /** |
| * @file |
| * This module implements an acknowledgement generator for 802.15.4 radio driver. |
| * |
| */ |
| |
| #include "nrf_802154_ack_generator.h" |
| |
| #include <assert.h> |
| #include <stdlib.h> |
| |
| #include "nrf_802154_const.h" |
| #include "nrf_802154_enh_ack_generator.h" |
| #include "nrf_802154_imm_ack_generator.h" |
| |
| typedef enum |
| { |
| FRAME_VERSION_BELOW_2015, |
| FRAME_VERSION_2015_OR_ABOVE, |
| FRAME_VERSION_INVALID |
| } frame_version_t; |
| |
| static frame_version_t frame_version_is_2015_or_above(const uint8_t * p_frame) |
| { |
| switch (p_frame[FRAME_VERSION_OFFSET] & FRAME_VERSION_MASK) |
| { |
| case FRAME_VERSION_0: |
| case FRAME_VERSION_1: |
| return FRAME_VERSION_BELOW_2015; |
| |
| case FRAME_VERSION_2: |
| return FRAME_VERSION_2015_OR_ABOVE; |
| |
| default: |
| return FRAME_VERSION_INVALID; |
| } |
| } |
| |
| void nrf_802154_ack_generator_init(void) |
| { |
| // Both generators are initialized to enable sending both Imm-Acks and Enh-Acks. |
| nrf_802154_imm_ack_generator_init(); |
| nrf_802154_enh_ack_generator_init(); |
| } |
| |
| const uint8_t * nrf_802154_ack_generator_create(const uint8_t * p_frame) |
| { |
| // This function should not be called if ACK is not requested. |
| assert(p_frame[ACK_REQUEST_OFFSET] & ACK_REQUEST_BIT); |
| |
| switch (frame_version_is_2015_or_above(p_frame)) |
| { |
| case FRAME_VERSION_BELOW_2015: |
| return nrf_802154_imm_ack_generator_create(p_frame); |
| |
| case FRAME_VERSION_2015_OR_ABOVE: |
| return nrf_802154_enh_ack_generator_create(p_frame); |
| |
| default: |
| return NULL; |
| } |
| } |