88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <logging/log.h>
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LOG_MODULE_REGISTER(net_ieee802154_csma, CONFIG_NET_L2_IEEE802154_LOG_LEVEL);
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#include <net/net_core.h>
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#include <net/net_if.h>
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#include <misc/util.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "ieee802154_frame.h"
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#include "ieee802154_utils.h"
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#include "ieee802154_radio_utils.h"
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static inline int csma_ca_radio_send(struct net_if *iface,
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struct net_pkt *pkt,
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struct net_buf *frag)
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{
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const u8_t max_bo = CONFIG_NET_L2_IEEE802154_RADIO_CSMA_CA_MAX_BO;
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const u8_t max_be = CONFIG_NET_L2_IEEE802154_RADIO_CSMA_CA_MAX_BE;
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u8_t retries = CONFIG_NET_L2_IEEE802154_RADIO_TX_RETRIES;
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struct ieee802154_context *ctx = net_if_l2_data(iface);
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bool ack_required = prepare_for_ack(ctx, pkt, frag);
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u8_t be = CONFIG_NET_L2_IEEE802154_RADIO_CSMA_CA_MIN_BE;
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u8_t nb = 0U;
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int ret = -EIO;
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NET_DBG("frag %p", frag);
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loop:
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while (retries) {
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retries--;
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if (be) {
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u8_t bo_n = sys_rand32_get() & ((1 << be) - 1);
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k_busy_wait(bo_n * 20);
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}
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while (1) {
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if (!ieee802154_cca(iface)) {
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break;
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}
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be = min(be + 1, max_be);
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nb++;
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if (nb > max_bo) {
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goto loop;
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}
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}
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ret = ieee802154_tx(iface, pkt, frag);
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if (ret) {
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continue;
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}
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ret = wait_for_ack(iface, ack_required);
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if (!ret) {
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break;
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}
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}
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return ret;
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}
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static enum net_verdict csma_ca_radio_handle_ack(struct net_if *iface,
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struct net_pkt *pkt)
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{
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struct ieee802154_context *ctx = net_if_l2_data(iface);
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return handle_ack(ctx, pkt);
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}
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/* Declare the public Radio driver function used by the HW drivers */
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FUNC_ALIAS(csma_ca_radio_send,
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ieee802154_radio_send, int);
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FUNC_ALIAS(csma_ca_radio_handle_ack,
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ieee802154_radio_handle_ack, enum net_verdict);
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